A dual-servo fixed-length paper feeding device and a cigarette packing machine

Abstract

The present invention provides a dual-servo fixed-length paper feeding device and a cigarette packing machine, wherein the dual-servo fixed-length paper feeding device comprises a scoring mechanism, a paper tape conveying mechanism and a color mark detector; the scoring mechanism comprises a first servo motor, a top knife shaft, a scoring shaft, a top knife wheel fixed on the top knife shaft, a scoring wheel fixed on the scoring shaft, and a scoring transmission unit, wherein the first servo motor is connected to the top knife shaft and the scoring shaft through the scoring transmission unit, and the outer periphery of the scoring wheel is provided with a plurality of scoring stations and a compensation gap formed between two adjacent scoring stations; the paper tape conveying mechanism comprises a second servo motor, a first paper feeding shaft, a second paper feeding shaft, a first paper feeding wheel fixed on the first paper feeding shaft, a second paper feeding wheel fixed on the second paper feeding shaft, and a paper feeding transmission unit, wherein the second servo motor is connected to the first paper feeding shaft and the second paper feeding shaft through the paper feeding transmission unit. The present application can realize fixed-length conveying of paper tapes and ensure the color block position and U-shaped scoring position on each fixed-length paper tape.

Description

Technical Field

[0001] The present invention relates to the field of cigarette packing, and in particular to a dual-servo fixed-length paper feeding device and a cigarette packing machine comprising the dual-servo fixed-length paper feeding device. Background Art

[0002] At present, cigarette packing machines are equipped with a paper feeding device, which is used to form scores on the paper tape and feed the paper tape; Figure 2 As shown in FIG. 1 , the notches include a U-shaped notch 101 and dotted notches 102 located on both sides of the U-shaped notch 101. Figure 1 As shown, it includes a rotatable power shaft 200, a notched wheel set 300 fixedly mounted on the power shaft 200, a rotatable driving shaft 400, a driving paper feeding wheel 500 fixed on the driving shaft 400, a rotatable driven shaft 600, and a driven paper feeding wheel 700 fixed on the driven shaft 600. The power shaft 200 and the driving shaft 400 are connected via a gear pair, and the driving shaft 400 and the driven shaft 600 are also connected via a gear pair. When the paper feeding device is in operation, on the one hand, the power shaft 200 drives the scoring wheel set 300 to rotate, and the scoring wheel set 300 processes the scoring on the paper tape; on the other hand, the power shaft 200 drives the driving shaft 400 and the driving paper feeding wheel 500 to rotate through the gear pair, and the driving shaft 400 drives the driven shaft 600 and the driven paper feeding wheel 700 to rotate through the gear pair. After passing through the scoring wheel set 300, the paper tape is vertically input between the driving paper feeding wheel 500 and the driven paper feeding wheel 700, and the friction between the driving paper feeding wheel 500 and the driven paper feeding wheel 700 drives the paper tape to move forward, thereby achieving the purpose of conveying the paper tape. Therefore, in the existing paper feeding device, the transmission power of the entire paper feeding device comes from the power shaft 200, and the power transmission system of the scoring wheel set 300 and the driving paper feeding wheel 500 is on the same transmission chain. However, the existing paper feeding device has the following problems:

[0003] 1. With the personalized demand for cigarette packs, the paper feeding device is required to convey the paper tape at a fixed length for the production of fixed-length paper tape. However, the above-mentioned paper feeding device can only meet the conveying requirements of paper tapes with low conveying accuracy, but cannot meet the requirements of paper tape conveying with high conveying accuracy, fixed-length conveying of paper tapes with color marks on the paper tapes, and the occasions where the paper tape conveying requires to be adjustable forward and backward.

[0004] 2. If Figure 2As shown, the position of the color block 103 on the fixed-length paper tape 10 from the top of the paper tape and the position of the U-shaped notch 101 from the top of the paper tape are both fixed positions. Usually, the color block 103 on the fixed-length paper tape 10 is 22 mm away from the top of the paper tape, and the U-shaped notch 101 on the fixed-length paper tape 10 is 34 mm away from the top of the paper tape. First, the above-mentioned paper feeding device cannot meet the requirements of fixed-length paper tape transportation; second, due to the existence of objective factors such as manufacturing errors, the elasticity of the paper tape, and printing system errors, the active paper feeding wheel 500 and the driven paper feeding wheel 700 cannot make the linear speed of the active paper feeding wheel 500 and the driven paper feeding wheel 700 equal to the linear speed of the notch wheel group 300 in the process of pulling the fixed-length paper tape forward, which leads to a systematic one-way cumulative error in the position of the U-shaped notch 101 on the paper tape from the color block 103. After the paper tape is cut, the position of the U-shaped notch 101 on the paper tape will change, and the position of the color block 103 will also float relatively, which ultimately leads to inaccurate paper tape cutting. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a dual-servo fixed-length paper feeding device, which can ensure that the relative positions of the color blocks and U-shaped notches on the paper tape remain unchanged while achieving fixed-length paper tape feeding.

[0006] To achieve the above-mentioned object, the present invention provides a dual-servo fixed-length paper feeding device, comprising a box body, a notching mechanism, a paper tape conveying mechanism, and a color mark detector installed on the box body, wherein the color mark detector is arranged at the inlet end of the notching mechanism; the notching mechanism comprises a first servo motor, a top knife shaft and a notching shaft both rotatably installed in the box body, a top knife wheel fixed on the top knife shaft, a notching wheel fixed on the notching shaft, and a notching transmission unit, wherein the first servo motor is connected to the top knife shaft and the notching shaft through the notching transmission unit, and the outer periphery of the notching wheel There are multiple scoring stations that are evenly distributed in the circumference and all cooperate with the top knife wheel, and a compensation gap formed between two adjacent scoring stations. Each scoring station is provided with a cutter fixed to the outer circumference of the scoring wheel; the paper tape conveying mechanism includes a second servo motor, a first paper feed shaft and a second paper feed shaft that are rotatably installed in a box body, a first paper feed wheel fixed on the first paper feed shaft, a second paper feed wheel fixed on the second paper feed shaft, and a paper feed transmission unit. The second servo motor is connected to the first paper feed shaft and the second paper feed shaft through the paper feed transmission unit.

[0007] Furthermore, the scoring wheel is provided with four scoring stations.

[0008] Furthermore, the dual-servo fixed-length paper feeding device also includes a first bracket fixed to the box body by a first screw, and a second bracket fixed to the first bracket by a second screw, and the color mark detector is fixed to the second bracket by a third screw; the first bracket is provided with a first adjustment hole extending left and right, and the first screw is passed through the first adjustment hole; the second bracket is provided with a second adjustment hole extending up and down, and a third adjustment hole extending front and back, the second screw is passed through the second adjustment hole, and the third screw is passed through the third adjustment hole.

[0009] Furthermore, the scoring transmission unit includes a first reducer, a first gear assembly, and a second gear assembly. The first servo motor is connected to the first gear assembly through the first reducer. The top cutter shaft is a gear shaft having a gear shaft section that is transmission-matched with the first gear assembly. The top cutter shaft is connected to the scoring shaft through the second gear assembly.

[0010] Furthermore, the dual-servo fixed-length paper feeding device also includes an eccentric sleeve rotatably mounted in the housing, and the notching shaft is rotatably supported in the eccentric sleeve via a first bearing.

[0011] Furthermore, the second gear assembly includes a first gear fixed on the top cutter shaft, and a second gear and a third gear both fixed on the scoring shaft, the second gear and the third gear constitute a double gear and are both meshed with the first gear.

[0012] Furthermore, the paper feeding transmission unit includes a second reducer, a third gear assembly, and a fourth gear assembly, the second servo motor is connected to the third gear assembly through the second reducer, the third gear assembly is connected to the first paper feeding shaft, and the first paper feeding shaft is connected to the second paper feeding shaft through the fourth gear assembly.

[0013] Furthermore, the dual-servo fixed-length paper feeding device also includes a compression spring installed in the box body, the first paper feeding shaft is rotatably supported in the box body by a second bearing, and the second paper feeding shaft is rotatably supported in the box body by a third bearing, and the compression spring extends axially along the distribution direction of the first paper feeding shaft and the second paper feeding shaft, and abuts against the third bearing.

[0014] Furthermore, the top knife shaft and the scoring shaft are arranged side by side in the front-to-back direction, and the first paper feeding shaft and the second paper feeding shaft are arranged side by side in the up-down direction.

[0015] The present invention further provides a cigarette packing machine, in which the double-servo fixed-length paper feeding device as described above is configured.

[0016] As described above, the dual-servo fixed-length paper feeding device and cigarette packing machine according to the present invention have the following beneficial effects:

[0017] The present application adopts dual servo motors to drive the notching mechanism and the paper tape conveying mechanism respectively, which can accurately control the conveying length of the paper tape, realize the fixed-length conveying of the paper tape, and can be suitable for the conveying of fixed-length paper tapes with high precision requirements; in particular, when the top knife wheel cooperates with the notching wheel at the compensation notch of the notching wheel, the compensation notch on the periphery of the notching wheel prevents the cutter from cutting the paper tape and generating an idle period. During the idle period, the output of the first servo motor can be adjusted according to the position of the color block on the paper tape detected by the color mark detector, thereby dynamically adjusting the position of the U-shaped notch on the paper tape relative to the color block, thereby ensuring that the relative position of the color block and the U-shaped notch on the paper tape remains unchanged. Therefore, under the premise of realizing the fixed-length conveying of the paper tape, the present application also effectively ensures the position of the color block and the U-shaped notch on each fixed-length paper tape, and ultimately ensures the quality of the fixed-length paper tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a paper feeding device in the prior art.

[0019] Figure 2 This is a schematic diagram of the structure of a fixed-length paper tape.

[0020] Figure 3 and Figure 4 It is a schematic diagram of the structure of the dual-servo fixed-length paper feeding device in this application.

[0021] Figure 5 for Figure 3 Side view of.

[0022] Figure 6 for Figure 4 Enlarged view of circle A.

[0023] Figure 7 for Figure 5 BB section view.

[0024] Figure 8 for Figure 5 DD section view.

[0025] Fig. 9 for Figure 8 Enlarged view of box C in .

[0026] Fig.10 Schematic diagram of the structure of the scoring wheel in this application.

[0027] Fig.11 for Fig.10 Side view of.

[0028] Fig.12 This is a schematic diagram of the structure of the encoder at the main shaft of the cigarette packing machine in this application.

[0029] Component number description

[0030] 10 Fixed-length paper tape

[0031] 101 U-shaped notch

[0032] 102 dotted notch

[0033] 103 Color Blocks

[0034] 20 Cabinet

[0035] 21 Fix the cabinet

[0036] 22 movable cabinet

[0037] 23 First Hook

[0038] 24 Second hook

[0039] 25 Tension spring

[0040] 30 Notch mechanism

[0041] 31 First servo motor

[0042] 32 Top cutter shaft

[0043] 33 Notched shaft

[0044] 34 Top cutter wheel

[0045] 35 Notched Wheel

[0046] 351 Score Station

[0047] 352 Compensation Gap

[0048] 36 First reducer

[0049] 37 Eccentric sleeve

[0050] 38 First Gear

[0051] 39 Second Gear

[0052] 310 Third gear

[0053] 311 Fourth Gear

[0054] 312 Support

[0055] 313 Bridge gear

[0056] 40 Paper tape conveyor mechanism

[0057] 41 Second servo motor

[0058] 42 First paper feed shaft

[0059] 43 Second paper feed shaft

[0060] 44 First paper feed roller

[0061] 45 Second paper feed roller

[0062] 46 Second reducer

[0063] 47 Fixed block

[0064] 48 Fixed seat

[0065] 49 Adapter Plate

[0066] 410 Fifth Gear

[0067] 411 Sixth Gear

[0068] 412 Seventh Gear

[0069] 413 Compression spring

[0070] 414 Gear Set

[0071] 50 Color mark detector

[0072] 60 First screw

[0073] 70 First Bracket

[0074] 80 Second screw

[0075] 90 Second bracket

[0076] 91 Second adjustment hole

[0077] 92 Third adjustment hole

[0078] 111 Spindle

[0079] 112 Encoder

[0080] 113 Connecting shaft

[0081] 114 Turntable

[0082] 115 Connecting plate

[0083] 116 Connecting bracket

[0084] 117 Connection flange

[0085] 118 Connecting rod

[0086] 120 Third screw DETAILED DESCRIPTION

[0087] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0088] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0089] The present invention provides a cigarette packing machine, which is equipped with a dual servo fixed-length paper feeding device and an electronic control system. Figure 3 As shown, the dual-servo fixed-length paper feeding device involved in the present application includes a box body 20, a notching mechanism 30, a paper tape conveying mechanism 40, and a color mark detector 50 installed on the box body 20. Figure 3 , Figure 5 and Fig. 9 As shown, the scoring mechanism 30 includes a first servo motor 31, a top knife shaft 32 and a scoring shaft 33 rotatably mounted in the housing 20, a top knife wheel 34 fixed on the top knife shaft 32, a scoring wheel 35 fixed on the scoring shaft 33, and a scoring transmission unit. The first servo motor 31 is connected to the top knife shaft 32 and the scoring shaft 33 through the scoring transmission unit to drive the top knife shaft 32 and the scoring shaft 33 to rotate; the top knife wheel 34 is a smooth roller; as shown in FIG. Fig.10 and Fig.11 As shown, the outer circumference of the scoring wheel 35 is provided with a plurality of scoring stations 351 which are evenly distributed in the circumferential direction and all cooperate with the top cutter wheel 34, and a compensation gap 352 is formed between two adjacent scoring stations 351. Each scoring station 351 is provided with a cutter fixed on the outer circumference of the scoring wheel 35. When the scoring station 351 on the outer circumference of the scoring wheel 35 cooperates with the top cutter wheel 34, the cutter cuts the paper tape and cuts a U-shaped notch 101 and a dotted notch 102 on the paper tape, as shown in FIG. Figure 2 As shown; when the compensation notch 352 on the periphery of the notch wheel 35 cooperates with the top cutter wheel 34, the cutter does not cut the paper tape and a gap is generated. Figure 3 ,as well as Figure 7 and Figure 8As shown, the paper tape conveying mechanism 40 includes a second servo motor 41, a first paper feed shaft 42 and a second paper feed shaft 43 rotatably mounted in the housing 20, a first paper feed wheel 44 fixed on the first paper feed shaft 42, a second paper feed wheel 45 fixed on the second paper feed shaft 43, and a paper feed transmission unit. The second servo motor 41 is connected to the first paper feed shaft 42 and the second paper feed shaft 43 through the paper feed transmission unit to drive the first paper feed shaft 42 and the second paper feed shaft 43 to rotate. Figure 3 As shown, the color mark detector 50 is arranged at the inlet end of the notching mechanism 30, that is, installed at the station before the notching wheel 35. The paper tape first passes through the station of the color mark detector 50 and then passes through the station of the notching wheel 35.

[0090] In the above-mentioned dual-servo fixed-length paper feeding device, the color mark detector 50, the first servo motor 31 and the second servo motor 41 are all connected to the electronic control system. When the dual-servo fixed-length paper feeding device is in operation, for the scoring mechanism 30: the first servo motor 31 drives the top knife shaft 32 and the scoring shaft 33 to rotate through the scoring transmission unit, the top knife shaft 32 drives the top knife wheel 34 to rotate synchronously, and the scoring shaft 33 drives the scoring wheel 35 to rotate synchronously, and the paper tape forms a cut when passing between the top knife wheel 34 and the scoring wheel 35, that is, the U-shaped score 101 and the dotted score 102 are cut on the paper tape through the cooperation of the top knife wheel 34 and the scoring station 351 on the scoring wheel 35. Furthermore, the color mark detector 50 detects the color block 103 on the paper tape at the inlet end of the notching mechanism 30 and sends the color block position information to the electronic control system; when the top knife wheel 34 cooperates with the notching wheel 35 at the compensation notch 352 of the notching wheel 35, during the idle period, the electronic control system adjusts the output of the first servo motor 31 according to the color block position information fed back by the color mark detector 50, so that the first servo motor 31 rotates forward or reversely by an angle, and dynamically adjusts the speed and phase of the first servo motor 31, thereby dynamically adjusting the position of the U-shaped notch 101 on the paper tape relative to the color block 103, ensuring that the relative positions of the color block 103 and the U-shaped notch 101 on the paper tape remain unchanged. For the paper tape conveying mechanism 40: the second servo motor 41 drives the first paper feed shaft 42 and the second paper feed shaft 43 to rotate through the paper feed transmission unit, the first paper feed shaft 42 drives the first paper feed wheel 44 to rotate, the second paper feed shaft 43 drives the second paper feed wheel 45 to rotate, the paper tape passes between the first paper feed wheel 44 and the second paper feed wheel 45, and the friction between the first paper feed wheel 44 and the second paper feed wheel 45 drives the paper tape to move forward; since the notching mechanism 30 can accurately control the relative positions of the color block 103 and the U-shaped notch 101 on the paper tape, the electronic control system only needs to control the output of the second servo motor 41 to realize the fixed-length conveying of the paper tape, and can be suitable for the conveying of fixed-length paper tape 10 with higher precision requirements, and the error of the fixed-length conveying of the paper tape can be controlled within 0.1-0.5mm. Therefore, under the premise of realizing fixed-length conveyor paper tape, the present application also effectively guarantees the position of the color block and the position of the U-shaped notch 101 on each fixed-length paper tape 10, that is, the present application effectively guarantees that each fixed-length paper tape 10 has the same length, color block position and U-shaped notch 101 position, ultimately ensuring the quality of the fixed-length paper tape 10.

[0091] Preferably, if Figure 3 ,as well as Figures 7 to 9As shown, the top knife shaft 32, the scoring shaft 33, the first paper feed shaft 42 and the second paper feed shaft 43 are parallel and extend left and right; wherein, the top knife shaft 32 and the scoring shaft 33 are arranged side by side in the front-to-back direction, the first paper feed shaft 42 and the second paper feed shaft 43 are arranged side by side in the up-down direction, the first paper feed shaft 42 and the second paper feed shaft 43 are arranged on the upper side of the top knife shaft 32 and the scoring shaft 33 at the same time, and the first paper feed shaft 42 is located on the lower side of the second paper feed shaft 43. Therefore, the moving direction of the paper tape in the scoring mechanism 30 is upward, and the moving direction of the paper tape in the paper tape conveying mechanism 40 is forward. Fig.11 As shown, four scoring stations 351 are provided on the scoring wheel 35 , thereby forming four compensation notches 352 on the outer circumference of the scoring wheel 35 .

[0092] Furthermore, if Figure 3 and Fig. 9 As shown, the box 20 includes a fixed box 21, a movable box 22 hinged at the upper end of the fixed box 21, and a locking mechanism connected between the fixed box 21 and the movable box 22. The locking mechanism can lock the movable box 22 at the upper end of the fixed box 21, and the movable box 22 can rotate upward relative to the fixed box 21. The top knife shaft 32, the scoring shaft 33 and the first paper feeding shaft 42 are all rotatably supported in the fixed box 21, and the second paper feeding shaft 43 is rotatably supported in the movable box 22. Based on this, when the paper tape passes through the paper tape conveying mechanism 40, the locking between the movable box 22 and the fixed box 21 is released by the locking mechanism, and the movable box 22 is rotated upward, so that the movable box 22 drives the second paper feeding shaft 43 and the second paper feeding wheel 45 to move upward together, so that the gap between the second paper feeding wheel 45 and the first paper feeding wheel 44 becomes larger, and then the paper tape is conveniently passed between the first paper feeding wheel 44 and the second paper feeding wheel 45. After the paper tape passes through, the movable box 22 is reset and locked to the upper end of the fixed box 21 by a locking mechanism. Preferably, the locking mechanism includes a first hook 23 fixedly connected to the fixed box 21, a second hook 24 hinged to the movable box 22, and a tension spring 25 connected between the movable box 22 and the second hook 24; in the locked state, Fig. 9 As shown, the lower ends of the first hook 23 and the second hook 24 are engaged with each other, thereby locking the movable box 22 to the upper end of the fixed box 21; the tension spring 25 applies a force toward the first hook 23 to the second hook 24 to ensure the stability of the engagement of the first hook 23 and the second hook 24; when unlocking, the force is applied to flip the first hook 24 outward, and then the movable box 22 can be flipped upward.

[0093] Furthermore, if Figure 3 , Figure 4 and Figure 6As shown, the dual-servo fixed-length paper feeding device also includes a first bracket 70 fixed to the box body 21 in the box body 20 by a first screw 60, and a second bracket 90 fixed to the first bracket 70 by a second screw 80, and the color mark detector 50 is fixed to the second bracket 90 by a third screw 120; the first bracket 70 is provided with a first adjustment hole extending left and right, and the first screw 60 is inserted into the first adjustment hole; the second bracket 90 is provided with a second adjustment hole 91 extending up and down, and a third adjustment hole 92 extending front and back, the second screw 80 is inserted into the second adjustment hole 91, and the third screw 120 is inserted into the third adjustment hole 92. After adopting the above structure, the left-right position of the first bracket 70 relative to the fixed box 21 is adjustable, the up-down position of the second bracket 90 relative to the fixed box 21 is adjustable, and the front-back position of the color mark detector 50 relative to the second bracket 90 is adjustable, so that the left-right, front-back and up-down positions of the color mark detector 50 can be adjusted, so that no matter where the color block 103 on the paper tape is, the color mark detector 50 can detect the color block 103 on the paper tape and can work normally. Preferably, the color mark detector 50 is a KTS color mark sensor of SICK, and the detection area is a square color block.

[0094] Furthermore, the preferred structure of the notch transmission unit is as follows: Figure 3 and Figure 7 As shown, the notching transmission unit includes a first reducer 36, a first gear assembly, and a second gear assembly. The first reducer 36 is fixedly installed on the left side of the fixed housing 21 in the housing 20 by screws. The first servo motor 31 is connected to the first gear assembly through the first reducer 36. The top cutter shaft 32 is a gear shaft, and the left end has a gear shaft section that is transmission-matched with the first gear assembly. The top cutter shaft 32 is connected to the notching shaft 33 through the second gear assembly, so the top cutter shaft 32 is the driving shaft, and the notching shaft 33 is the driven shaft. Preferably, the dual-servo fixed-length paper feeding device also includes a pair of eccentric sleeves 37 rotatably installed in the fixed housing 21, and the notching shaft 33 is rotatably supported in the eccentric sleeves 37 through the first bearing; the eccentric sleeves 37 are rotated to adjust the position of the notching shaft 33 relative to the top cutter shaft 32, thereby adjusting the spacing between the notching wheel 35 and the top cutter wheel 34, so as to adjust the pressure between the notching wheel 35 and the top cutter wheel 34, so as to achieve the purpose of adjusting the depth of the notching. The top cutter shaft 32 is rotatably supported in the fixed housing 21 through a needle bearing. A buffer layer supported by polyurethane is provided in the middle of the top cutter wheel 34 to protect the blade of the cutter.

[0095] Based on the structure in which the position of the notched shaft 33 is adjustable, as Figure 7As shown, the second gear assembly in the present application includes a first gear 38 fixed on the top cutter shaft 32, and a second gear 39 and a third gear 310 both fixed on the notching shaft 33. The second gear 39 and the third gear 310 are arranged side by side along the axial direction of the notching shaft 33. The second gear 39 and the third gear 310 constitute a double gear and are both meshed with the first gear 38. In addition, the gap between the first gear 38 and the second gear 39 and the gap between the first gear 38 and the third gear 310 allow the position of the notching shaft 33 to float. The second gear 39 is tightly meshed with the first gear 38 in the front direction, and the third gear 310 is tightly meshed with the first gear 38 in the rear direction, thereby ensuring the transmission accuracy of the second gear assembly. The first gear assembly includes a fourth gear 311 fixed to the output end of the first reducer 36, a support 312 fixed to the housing 21 in the housing 20 by screws, and a bridge gear 313 rotatably mounted on the support 312 by a rolling bearing, the fourth gear 311 meshes with the bridge gear 313, and the bridge gear 313 meshes with the gear shaft section of the top cutter shaft 32. The output end of the first reducer 36 and the fourth gear 311, and the top cutter shaft 32 and the first gear 38 are all keyed.

[0096] The transmission process of the scoring transmission unit is as follows: the first servo motor 31 drives the first reducer 36 to rotate, the first reducer 36 drives the fourth gear 311 to rotate, the fourth gear 311 drives the bridge gear 313 to rotate, the bridge gear 313 drives the top knife shaft 32 to rotate, the top knife wheel 34 and the first gear 38 rotate synchronously with the top knife shaft 32, the first gear 38 drives the second gear 39 and the third gear 310 to rotate, and finally drives the scoring shaft 33 and the scoring wheel 35 to rotate synchronously, and the U-shaped and dotted line scoring of the paper tape is completed when the paper tape passes between the top knife wheel 34 and the scoring wheel 35.

[0097] Furthermore, the preferred structure of the paper feeding transmission unit is as follows: Figure 3 ,as well as Figure 8 and Fig. 9As shown, the paper feeding transmission unit includes a second reducer 46, a third gear assembly, and a fourth gear assembly. The second servo motor 41 is connected to the third gear assembly through the second reducer 46, and the third gear assembly is connected to the first paper feeding shaft 42. The first paper feeding shaft 42 is connected to the second paper feeding shaft 43 through the fourth gear assembly, so the first paper feeding shaft 42 is the driving shaft, and the second paper feeding shaft 43 is the driven shaft. A fixing block 47 for supporting the second reducer 46 is fixed by screws to the right side of the fixed box 21 in the box 20, and a fixing seat 48 is fixedly connected to the fixing block 47 by screws and pins. The second reducer 46 is fixed to the fixing seat 48 by screws and pins; a layer of aluminum sealing gasket is provided between the fixing seat 48 and the fixed box 21 for gear lubrication and sealing. The third gear assembly includes an adapter plate 49 fixed to the output end of the second reducer 46, a fifth gear 410 fixed to the adapter plate 49, and a sixth gear 411 fixed to the right end of the first paper feed shaft 42, and the fifth gear 410 and the sixth gear 411 are meshed. The fourth gear assembly includes a seventh gear 412 fixed to the left end of the first paper feed shaft 42, and a gear set 414 fixed to the left end of the second paper feed shaft 43, and the seventh gear 412 is meshed with the gear set 414. The gear set 414 uses a double gear to ensure the transmission accuracy between the gear set 414 and the seventh gear 412. The first paper feed shaft 42 and the sixth gear 411, the first paper feed shaft 42 and the seventh gear 412, and the second paper feed shaft 43 and the gear set 414 are all keyed.

[0098] The transmission process of the paper feeding transmission unit is as follows: the second servo motor 41 drives the second reducer 46 to rotate, the second reducer 46 drives the adapter plate 49 and the fifth gear 410 to rotate, the fifth gear 410 drives the sixth gear 411 to rotate, the first paper feeding shaft 42, the first paper feeding wheel 44 and the seventh gear 412 rotate synchronously with the sixth gear 411, the seventh gear 412 drives the gear set 414 to rotate, the second paper feeding shaft 43 and the second paper feeding wheel 45 rotate synchronously with the gear set 414, and the paper tape is sandwiched between the first paper feeding wheel 44 and the second paper feeding wheel 45 and is transported forward. The electronic control system can dynamically adjust the transmission speed of the paper tape by controlling the speed and direction of the second servo motor 41.

[0099] Furthermore, if Fig. 9As shown, the dual-servo fixed-length paper feeding device also includes a clamping spring 413 installed in the movable box 22 in the box 20; both left and right ends of the first paper feeding shaft 42 are rotatably supported in the fixed box 21 through the second bearing, and a sealing ring is provided on the outer side of the second bearing on the right side, and the sealing ring and the second bearing are fixed to the inside of the fixed box 21 with a gasket; both left and right ends of the second paper feeding shaft 43 are rotatably supported in the movable box 22 through the third bearing, and the third bearing is a square bearing; the clamping spring 413 extends axially up and down along the distribution direction of the first paper feeding shaft 42 and the second paper feeding shaft 43, and abuts against the outer peripheral surface of the third bearing, thereby clamping the square third bearing to ensure that there is a gap of 0.2 mm between the first paper feeding wheel 44 and the second paper feeding wheel 45, ensuring that the two drive the paper tape forward by friction.

[0100] Furthermore, the start signal of the dual-servo fixed-length paper feeding device is derived from the main shaft 111 in the cigarette packing machine. Based on this, an encoder 112 is installed on the main shaft 111 of the cigarette packing machine. The encoder 112 is connected to the electronic control system for communication. The electronic control system obtains the phase of the main shaft 111 through the feedback of the encoder 112, and then controls the start of the first servo motor 31 and the second servo motor 41 in the dual-servo fixed-length paper feeding device, so that the paper tape conveying phase matches the paper tape cutting system. The color mark detector 50 detects the first color block 103 on the paper tape, and the electronic control system sets the reference zero point according to the phase of the main shaft 111 in the cigarette packing machine and the position of the color block. The notch wheel 35 locates the relative position of the U-shaped notch 101 relative to the color block 103 according to the reference zero point, and the first paper feeding wheel 44 and the second paper feeding wheel 45 determine the fixed length of conveying according to the reference zero point positioning.

[0101] Preferably, the connection structure between the encoder 112 and the main shaft 111 of the cigarette packing machine is preferably: Fig.12 As shown, the end of the main shaft 111 is fixedly connected with a connecting shaft 113, and the outer end of the connecting shaft 113 is fixedly connected with a rotating disk 114 by screws; the encoder 112 is fixed to the connecting plate 115 by screws, the connecting plate 115 is fixed to the connecting bracket 116 by screws, and the connecting bracket 116 is fixed to the connecting flange 117 by screws; the shaft component of the encoder 112 is fixedly connected to the connecting rod 118 by screws, and the connecting rod 118 is also provided with a connecting groove, and the pin fixed on the rotating disk 114 is embedded in the connecting groove of the connecting rod 118. When the main shaft 111 rotates, the main shaft 111 drives the connecting shaft 113 and the rotating disk 114 to rotate together, and the rotating disk 114 directly drives the connecting rod 118 to rotate, thereby driving the encoder 112 to rotate, so that the encoder 112 and the main shaft 111 can move synchronously, and the phase of the main shaft 111 can be obtained through the output of the encoder 112.

[0102] In summary, the dual-servo fixed-length paper feeding device involved in the present application adopts dual servo motors to drive the top cutter wheel 34 and the notch wheel 35, as well as the first paper feeding wheel 44 and the second paper feeding wheel 45 respectively. Through the electrical control program, the relative position of the color block 103 and the U-shaped notch 101 on the paper tape and the fixed-length conveying length of the paper tape can be accurately controlled to ensure that each fixed-length paper tape 10 has the same length, color block position and U-shaped notch 101 position. It is suitable for conveying fixed-length paper tape 10 with high precision requirements. The fixed-length conveying error of the paper tape can be controlled within 0.1-0.5mm, thereby improving the adaptability of tobacco equipment to packaging auxiliary materials, improving the appearance of cigarette packs, improving the aesthetics of cigarette packs, and meeting the personalized needs of customers. In addition, the dual-servo fixed-length paper feeding device has strong adaptability, and users can freely switch between conventional conveying and fixed-length conveying of paper tapes according to their needs. In addition, the present application can be modified on the original paper feeding device to reduce costs, with a simple structure and convenient adjustment.

[0103] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0104] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A dual-servo fixed-length paper feeding device, characterized in that: It comprises a box body (20), a notching mechanism (30), a paper tape conveying mechanism (40), a color mark detector (50) installed on the box body (20), and an electric control system of a cigarette packing machine, wherein the color mark detector (50) is arranged at the inlet end of the notching mechanism (30); The notching mechanism (30) comprises a first servo motor (31), a top cutter shaft (32) and a notching shaft (33) both rotatably mounted in a housing (20), a top cutter wheel (34) fixed to the top cutter shaft (32), a notching wheel (35) fixed to the notching shaft (33), and a notching transmission unit, wherein the first servo motor (31) is connected to the top cutter shaft (32) and the notching shaft (33) via the notching transmission unit, and the outer periphery of the notching wheel (35) is provided with a plurality of notching stations (351) uniformly distributed in the circumferential direction and all cooperating with the top cutter wheel (34), and a compensation notch (352) formed between two adjacent notching stations (351). , each notching station (351) is provided with a cutter fixed to the outer periphery of the notching wheel (35); the notching transmission unit comprises a first reducer (36), a first gear assembly, a second gear assembly, and an eccentric sleeve (37) rotatably mounted in a housing (20); the first servo motor (31) is connected to the first gear assembly via the first reducer (36); the top cutter shaft (32) is a gear shaft having a gear shaft section that is transmission-matched with the first gear assembly; the top cutter shaft (32) is connected to the notching shaft (33) via the second gear assembly; the notching shaft (33) is rotatably supported in the eccentric sleeve (37) via a first bearing; The paper tape conveying mechanism (40) comprises a second servo motor (41), a first paper feed shaft (42) and a second paper feed shaft (43) both rotatably mounted in a housing (20), a first paper feed wheel (44) fixed to the first paper feed shaft (42), a second paper feed wheel (45) fixed to the second paper feed shaft (43), and a paper feed transmission unit, wherein the second servo motor (41) is connected to the first paper feed shaft (42) and the second paper feed shaft (43) via the paper feed transmission unit; The color mark detector (50), the first servo motor (31) and the second servo motor (41) are all communicatively connected to the electric control system; When the dual-servo fixed-length paper feeding device is in operation, the first servo motor (31) drives the top knife shaft (32) and the scoring shaft (33) to rotate via the scoring transmission unit, the top knife shaft (32) drives the top knife wheel (34) to rotate synchronously, and the scoring shaft (33) drives the scoring wheel (35) to rotate synchronously, and a cut is formed when the paper tape passes between the top knife wheel (34) and the scoring wheel (35), and a U-shaped cut (101) and a dotted line cut (102) are cut on the paper tape through the cooperation of the top knife wheel (34) and the scoring station (351) on the scoring wheel (35); the color mark detector (50) detects the color block (103) on the paper tape at the inlet end of the scoring mechanism (30) and transmits the color block position information to the paper tape. The electronic control system sends the information to the electronic control system; when the top knife wheel (34) cooperates with the scoring wheel (35) at the compensation notch (352) of the scoring wheel (35), the cooperation state of the top knife wheel (34) and the scoring wheel (35) is in a neutral period. During the neutral period, the electronic control system adjusts the output of the first servo motor (31) according to the color block position information fed back by the color mark detector (50), so that the first servo motor (31) rotates forward or reversely by an angle, and dynamically adjusts the rotation speed and phase of the first servo motor (31), thereby dynamically adjusting the position of the U-shaped notch (101) on the paper tape relative to the color block (103). The electronic control system only needs to control the output of the second servo motor (41) to realize fixed-length conveying of the paper tape.

2. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The scoring wheel (35) is provided with four scoring stations (351).

3. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The invention also comprises a first bracket (70) fixed to the box body (20) by a first screw (60), and a second bracket (90) fixed to the first bracket (70) by a second screw (80), and the color mark detector (50) is fixed to the second bracket (90) by a third screw (120); the first bracket (70) is provided with a first adjustment hole extending leftward and rightward, and the first screw (60) is inserted into the first adjustment hole; the second bracket (90) is provided with a second adjustment hole (91) extending up and down, and a third adjustment hole (92) extending forward and backward, the second screw (80) is inserted into the second adjustment hole (91), and the third screw (120) is inserted into the third adjustment hole (92).

4. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The second gear assembly comprises a first gear (38) fixed on the top cutter shaft (32), and a second gear (39) and a third gear (310) both fixed on the notching shaft (33); the second gear (39) and the third gear (310) constitute a double gear and are both meshed with the first gear (38).

5. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The paper feeding transmission unit comprises a second reducer (46), a third gear assembly, and a fourth gear assembly; the second servo motor (41) is connected to the third gear assembly via the second reducer (46); the third gear assembly is connected to the first paper feeding shaft (42); and the first paper feeding shaft (42) is connected to the second paper feeding shaft (43) via the fourth gear assembly.

6. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The invention also includes a compression spring (413) installed in the box body (20); the first paper feeding shaft (42) is rotatably supported in the box body (20) via a second bearing; the second paper feeding shaft (43) is rotatably supported in the box body (20) via a third bearing; the compression spring (413) extends axially along the distribution direction of the first paper feeding shaft (42) and the second paper feeding shaft (43) and abuts against the third bearing.

7. The dual-servo fixed-length paper feeding device according to claim 1, characterized in that: The top knife shaft (32) and the scoring shaft (33) are arranged side by side in the front-to-back direction, and the first paper feeding shaft (42) and the second paper feeding shaft (43) are arranged side by side in the up-down direction.

8. A cigarette packing machine, characterized in that: The cigarette packing machine is equipped with a dual-servo fixed-length paper feeding device as described in any one of claims 1-7.

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