CN116100862A - Color printing bag tracking system and method for bag making machine - Google Patents

Abstract

The invention discloses a color printing bag tracking system and a method of a bag making machine, which adopt a servo motor to drive and pull in a fixed length mode, adopt two sensors to respectively detect the positions of color codes and cutters, control a second motor to drive a traction roller to pull in a fixed length mode through taking a second sensor for detecting the positions of the cutters as a traction starting signal, dynamically assign the length of a traction bag in the next period by combining fixed length traction with color code detection, enable the length of the traction bag to be dynamically adjusted between the maximum allowed length of the bag and the minimum allowed length of the bag, and enable the color code signal to serve as a judgment signal for assigning value to a variable L of the length of the bag when the bag is pulled, and not be used for stopping the traction of the traction roller.

Description

Color printing bag tracking system and method for bag making machine

Technical Field

The invention relates to the technical field of bag making machines, in particular to a color printing bag tracking system and method of a bag making machine.

Background

The plastic bag making machine is a mechanical device for making various packaging bags by using plastic films as raw materials, and whether patterns are printed on the films are usually divided into blank bags and color printing bags, wherein the two packaging bags are required to be transversely cut after bag making is completed so as to cut the packaging bags in a connected state into independent individual packaging bags, a traction roller is generally adopted for carrying out fixed-length traction transverse cutting on the blank bags, namely, when the traction roller is used for traction to a set length, a cutter cuts once, a color mark sensor is adopted for detecting the color mark position of the color printing bag, when the color mark sensor detects the color mark, the traction pauses, the cutter waits for carrying out one-time cutting action, and because the color mark sensor has the requirement of response time, color mark signals cannot be obtained when the color mark sensor is pulled at a high speed, the traditional material pulling mode is that the color mark signals are detected when the color mark sensor is pulled at a high speed, the color mark is pulled at a section L1, then the color mark signals are detected when the color mark is pulled at a low speed, the color mark is cut at a section L2, and the color mark is cut off when the color mark signals are detected during the L2, wherein the L1+ L2 = Lmin, namely, in order to prevent the traction phenomenon caused by inertia of a transmission system in the process, and simultaneously, when the color mark sensor detects the color mark sensor and the color mark sensor detects the color mark marks, the color mark sensor is required to be pulled at a low speed, the color mark bag, the color mark is required to be pulled at a low speed, and the same time, the color mark bag is required to be produced, and the color bag is required to be cut, and the color bag is produced at a low speed, and the blank bag production bag, and the blank bag is required to be manufactured at a certain time, and the time.

Disclosure of Invention

The invention aims to provide a color printing bag tracking system and method of a bag making machine, which are used for solving the problems in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a system is trailed to system's color printing bag, includes the controller, its characterized in that still includes:

an unreeling device 16 for unreeling the film 1 printed with the color codes 5;

the feeding roller 3 is in transmission connection with the first motor and is used for pulling and feeding the film 1 on the unreeling device 16 forwards;

the traction roller 7 is in transmission connection with the second motor and is used for traction and conveying the film 1 conveyed by the feeding roller 3 to a cutting assembly according to a set length;

a tension roller 4 provided on the film 1 traveling path between the feed roller 3 and the pull roller 7, for buffering the film 1 fed by the feed roller 3 and maintaining the tension of the film 1 between the feed roller 3 and the pull roller 7;

the cutting assembly comprises a cutter 8, a transmission device 14 for driving the cutter 8 to cut the film 1 and a second sensor 13 for detecting the position of the cutter 8;

the first sensor 6 is arranged in front of the feeding end of the traction roller 7, and the first sensor 6 is used for detecting whether the color code 5 is in place when the traction roller 7 finishes one-time traction with a set length.

Further, an intermediate guide roller 2 is arranged between the unreeling device 16 and the feeding roller 3, and the intermediate guide roller 2 is used for horizontally guiding the film 1 into the feeding roller 3.

Further, the cutting assembly further comprises a cutter holder 10 for mounting the cutter 8, two ends of the cutter holder 10 are respectively connected with a guide pillar 9 which is vertically arranged, the lower ends of the guide pillars 9 are connected through a connecting plate 11, a transmission device 14 is in transmission connection with the connecting plate 11 through a pull rod 12, and an anvil 15 is arranged below the cutter 8 and matched with the cutter 8.

Further, the second motor is a servo motor, and the first motor is a speed regulating motor or a servo motor or a common motor.

As another aspect of the invention, the technical scheme also provides a color printing bag tracking method of the bag making machine, which is applied to the color printing bag tracking system of the bag making machine and comprises the following steps:

step 1: setting a bag length parameter, at least comprising a minimum bag length Lmin and a maximum bag length Lmax, storing the parameters into a controller, and carrying out initial assignment on a bag length variable L by the controller: l= (lmin+lmax)/2;

step 2: starting the bag making machine to operate, enabling the controller to send an operation signal, enabling the transmission device to drive the cutter to operate, enabling the second sensor to detect the position of the cutter and send the position signal to the controller, enabling the second sensor to send a signal to the controller to be a material pulling stop signal when the cutter is positioned at a film cutting position, and enabling the second sensor to send a signal to the controller to be a material pulling starting signal when the cutter is positioned at a high position allowing the film to pass through;

step 3: the controller judges whether a pulling start signal is received, if the pulling start signal is received, the step 4 is entered, and if the pulling start signal is not received, the second motor does not act and continues waiting;

step 4: the controller controls the second motor to start, drives the traction roller to rotate at a high speed to carry out fixed-length traction and bag pulling on the film, and when the length value of the traction and bag pulling=L, the second motor is suspended, at the moment, the cutter 8 descends to cut the film, and the step 401 and the step 402 are sequentially carried out simultaneously in the traction and bag pulling process, wherein the step 401 is specifically that the traction and bag pulling are started and simultaneously the material pulling cut-off signal is enabled; step 402 is specifically that the controller checks a pull-material cut-off signal during pulling the bag, if the pull-material cut-off signal is not detected, step 5 is performed, and if the pull-material cut-off signal is detected, step 11 is performed;

step 5: step 4, the fixed-length pulling bag pulling is completed, and the controller does not check the pulling cut-off signal in step 402, then the controller shields the current pulling cut-off signal, and the step 6 is entered;

step 6: the controller judges whether the color code is detected according to the signal sent by the first sensor, if the color code is detected, the step 7 is carried out, and if the color code is not detected, the step 8 is carried out;

step 7: the controller assigns a value to the bag length variable L: l=lmin as the next cycle pull-draw length value, and go to step 9;

step 8: the controller assigns a value to the bag length variable L: l=lmax as the next cycle pull-draw length value, and go to step 9;

step 9: the controller checks whether the operation signal exists continuously, if the operation signal exists, the step 3 is started to carry out fixed-length traction bag pulling of the next period, and if the operation signal does not exist, the step 10 is started;

step 10, executing a normal shutdown program;

step 11, executing an overspeed shutdown procedure.

Further, in the step 1, the bag length adjustment length parameter a may be set.

Further, when the bag length adjustment length parameter a is set in the step 1, the controller in the step 6 determines that the color code is checked, and proceeds to a step 701, and if the color code is not checked, proceeds to a step 801;

step 701, the controller assigns a value to the bag length variable L: l=l-a as the next cycle pull-bag length value, and proceeds to step 702

Step 801, the controller assigns a value to the bag length variable L: l=l+a as the next cycle pull-bag length value, and proceeds to step 802;

step 702: the controller judges whether L > Lmin is established after the assignment of the bag length variable L, if L > Lmin is established, the step 9 is carried out, and if L > Lmin is not established, the step 12 is carried out;

step 802, the controller judges whether L < Lmax is established after the assignment of the bag length variable L, if L < Lmax is established, the step 9 is entered, and if L < Lmax is not established, the step 12 is entered;

and step 12, executing a color code misplacement alarm program.

The invention has the beneficial effects that: the invention provides a system and a method for tracking a color printing bag of a bag making machine, which adopt a servo motor to drive and pull the color printing bag in a fixed length mode, adopt two sensors to respectively detect the positions of color codes and cutters, start a second motor to drive a traction roller to carry out fixed length traction through a second sensor for detecting the positions of the cutters as a traction starting signal, dynamically assign the length of the traction bag in the next period by combining the fixed length traction with the detection of the color codes, dynamically adjust the length of the traction bag between the allowable maximum bag length and the minimum bag length, and after the fixed length traction bag pulling is finished, the first sensor detects whether the color codes reach the position of the first sensor or not, namely detect the color code signals when the traction roller pauses, and the color code signals are used as judging signals for assigning the length variable L of the color printing bag when the traction is finished, rather than the signals for stopping the traction of the traction roller.

Drawings

FIG. 1 is a schematic diagram of a color printing bag tracking system of a bag making machine according to the present invention;

FIG. 2 is a schematic diagram of a cutting assembly of the bag machine color printing bag tracking system of the present invention;

FIG. 3 is a flowchart of a first embodiment of a method for tracking color bags of a bag making machine according to the present invention;

FIG. 4 is an enlarged view of a portion of step 1 to step 3 in FIG. 3;

fig. 5 is a partial enlarged view of step 4, step 5, step 401, step 402, and step 11 in fig. 3;

FIG. 6 is an enlarged view of a portion of step 6 to step 10 in FIG. 3;

FIG. 7 is a flowchart of a second embodiment of a method for tracking color bags of a bag making machine according to the present invention;

FIG. 8 is an enlarged view of a portion of step 1 to step 3 in FIG. 7;

fig. 9 is a partial enlarged view of step 4 to step 6, step 401, step 402, and step 11 in fig. 7;

fig. 10 is a partial enlarged view of step 701 to step 12 in fig. 7.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-10, a color printing bag tracking system of a bag making machine includes a controller, and further includes: the device comprises an unreeling device 16, a feeding roller 3, a traction roller 7, a tension roller 4, a cutting assembly and a first sensor 6, wherein the unreeling device 16 is used for unreeling the film 1 printed with the color codes 5; the feeding roller 3 is in transmission connection with the first motor and is used for drawing and feeding the film 1 on the unreeling device 16 forwards; the traction roller 7 is in transmission connection with the second motor and is used for dragging and conveying the film 1 conveyed by the feeding roller 3 to the cutting assembly according to a set length; the tension roller 4 is arranged on the film 1 travelling path between the feeding roller 3 and the traction roller 7 and is used for buffering the film 1 conveyed by the feeding roller 3 and keeping the tension of the film 1 between the feeding roller 3 and the traction roller 7; the cutting assembly comprises a cutter 8, a transmission device 14 for driving the cutter 8 to cut the film 1 and a second sensor 13 for detecting the position of the cutter 8; the first sensor 6 is arranged in front of the feeding end of the traction roller 7, and the first sensor 6 is used for detecting whether the color code 5 is in place or not when the traction roller 7 finishes one-time traction with a set length; the feeding roller 3 and the traction roller 7 are of a roller group structure of double rollers, namely a driving roller and a compression roller structure which are arranged in parallel, the driving roller is in transmission connection with a corresponding motor, and the compression roller is used for compressing the film 1 on the driving roller, so that the traction is ensured to be carried out stably.

Preferably, an intermediate guide roller 2 is arranged between the unreeling device 16 and the feeding roller 3, and the intermediate guide roller 2 is used for horizontally guiding the film 1 into the feeding roller 3, so that the film 1 is fully flattened, wrinkles are avoided, and the bag making quality is ensured.

Preferably, the cutting assembly further comprises a cutter holder 10 for installing the cutter 8, two ends of the cutter holder 10 are respectively connected with a guide post 9 which is vertically arranged, the lower end of the guide post 9 is connected through a connecting plate 11, a transmission device 14 is in transmission connection with the connecting plate 11 through a pull rod 12, an anvil 15 is arranged below the cutter 8 and matched with the cutter 8, and the transmission device 14 is driven by an independent servo motor or a speed regulating motor, so that the cutting speed can be conveniently adjusted to cooperate with a traction bag of the traction roller 7, and the transmission device in the embodiment adopts a crank connecting rod structure to obtain faster cutting and resetting speeds, and realizes high-speed bag making cutting of the bag making machine under the cooperation of the traction roller 7.

Preferably, the second motor is a servo motor, the first motor is a speed regulating motor or a servo motor or a common motor, the second motor adopts the servo motor to accurately control the pulling bag length of the pulling roller 7, and can carry out the adjustment of the pulling bag length according to the instruction of the controller, the starting and stopping of the first motor are controlled by the tension signal of the tension roller 4, therefore, the first motor can adopt any one of the speed regulating motor or the servo motor or the common motor, wherein the important reference is that the tension roller 4 adopts a swinging roller type tension roller structure, the tension of the travelling film 1 can be controlled, the buffer storage function can be also realized, the effect that the feeding roller 3 uniformly pulls the unreeling device 16 uniformly can be realized, a section of film 1 is temporarily stored for the pulling roller 7 to rapidly pull the pulling roller 7, and when the pulling roller 7 is stopped, the feeding roller 3 swings downwards by the tension roller 4, the travelling path of the film 1 becomes long to buffer the buffer storage, and the bag making speed is further improved.

Here, the unreeling device 16 in the present technical solution may be directly replaced by an output device after the longitudinal sealing forming and/or the transverse sealing forming of the bag making machine, so that the present technical solution and the longitudinal sealing forming and/or the transverse sealing forming device of the bag making machine form an integrated structure.

As another aspect of the invention, the technical scheme also provides a color printing bag tracking method of the bag making machine, which is applied to the color printing bag tracking system of the bag making machine and comprises the following steps:

step 1: setting a bag length parameter, at least comprising a minimum bag length Lmin and a maximum bag length Lmax, storing the parameters into a controller, and carrying out initial assignment on a bag length variable L by the controller: l= (lmin+lmax)/2;

step 2: starting the bag making machine to operate, wherein the controller sends out an operation signal, the operation signal is always kept in normal operation, the transmission device 14 drives the cutter 8 to act, generally, the cutter 8 works in a uniform speed state in normal operation, the second sensor 13 detects the position of the cutter 8 and sends a position signal to the controller, when the cutter 8 is positioned at a film cutting position, the signal sent by the second sensor 13 to the controller is a material pulling stop signal, and when the cutter 8 is positioned at a high position allowing a film to pass, the signal sent by the second sensor 13 to the controller is a material pulling starting signal;

step 3: the controller judges whether a pulling start signal is received, if the pulling start signal is received, the step 4 is entered, and if the pulling start signal is not received, the second motor does not act and continues waiting;

step 4: the controller controls the second motor to start, drives the traction roller 7 to rotate at a high speed to carry out fixed-length traction and bag pulling on the film 1, and when the length value of the traction and bag pulling=L, the second motor is suspended, at the moment, the cutter 8 descends to cut the film, and the step 401 and the step 402 are simultaneously and sequentially executed in the traction and bag pulling process, wherein the step 401 is specifically that the traction and bag pulling are started and simultaneously the material pulling cut-off signal is enabled; step 402 is specifically that the controller checks a pull-material cut-off signal during pulling the bag, if the pull-material cut-off signal is not detected, step 5 is performed, and if the pull-material cut-off signal is detected, step 11 is performed;

step 401 and step 402 are sequentially executed simultaneously in the execution process of step 4, and the function of the step is to form an electronic interlocking effect on the actions of pulling and pulling the bag and the cutter 8, namely, if a bag pulling cut-off signal appears in the process of pulling and pulling the bag, the cutter 8 performs a bag cutting action in a descending line in the process of pulling and pulling the bag, namely, the bag body is cut open, and the waste bag appears, at this time, the bag making machine is stopped by executing step 11, so as to avoid continuously appearing the waste bag, and then an operator can adjust the following conditions according to specific conditions so as to enable the pulling and pulling speed of the pulling roller 7 to be matched with the running speed of the cutter 8: 1. the rotation speed of the second motor during traction can be increased so as to further increase the fixed-length traction bag pulling speed to meet the cutting speed of the matched cutter 8, and the rotation speed of the driving motor of the transmission device 14 can be reduced so as to reduce the cutting speed of the cutter 8 and match the traction speed of the traction roller 7;

step 5: step 4, the fixed-length pulling bag pulling is completed, and the controller does not check the pulling cut-off signal in step 402, then the controller shields the current pulling cut-off signal, and step 6 is entered, wherein the current pulling cut-off signal is shielded, namely, the current pulling cut-off signal is not effective in the current fixed-length bag pulling period at this time, so that the subsequent steps are smoothly executed;

step 6: the controller judges whether the color code is detected according to the signal sent by the first sensor 6, if the color code is detected, the step 7 is carried out, and if the color code is not detected, the step 8 is carried out;

step 7: the controller assigns a value to the bag length variable L: l=lmin as the next cycle pull-draw length value, and go to step 9;

step 8: the controller assigns a value to the bag length variable L: l=lmax as the next cycle pull-draw length value, and go to step 9;

by setting the steps 6, 7 and 8, the currently actually measured color code position is used as a judging reference, the traction bag pulling length of the next period is set, namely the traction bag pulling length is subjected to autonomous intelligent adjustment, and the method is an intelligent self-adaptive dynamic adjustment technology, so that the defect of low bag making efficiency of color printing bags caused by the fact that a section of low-speed traction is required to be set in a traditional traction transmission system is completely avoided, and the defect of inaccurate cutting position caused by traction overshoot is completely overcome;

step 9: the controller checks whether the operation signal exists continuously, if the operation signal exists, the step 3 is started to carry out fixed-length traction bag pulling of the next period, and if the operation signal does not exist, the step 10 is started;

step 10, executing a normal shutdown program;

step 11, executing an overspeed shutdown procedure.

Preferably, for further accurate control of the cutting accuracy, in step 1, a bag length adjustment length parameter a may also be set, wherein the value of a is smaller than the difference between Lmax and Lmin and the difference between Lmax and Lmin is preferably an integer multiple of a.

Preferably, when the bag length adjustment length parameter a is set in step 1, the controller proceeds to step 701 when it is determined that the color code is checked in step 6, and proceeds to step 801 when it is determined that the color code is not checked.

Step 701, the controller assigns a value to the bag length variable L: l=l-a as the next cycle pull-bag length value, and proceeds to step 702

Step 801, the controller assigns a value to the bag length variable L: l=l+a as the next cycle pull-bag length value, and proceeds to step 802;

step 702: the controller judges whether L > Lmin is established after the assignment of the bag length variable L, if L > Lmin is established, the step 9 is carried out, and if L > Lmin is not established, the step 12 is carried out;

step 802, the controller judges whether L < Lmax is established after the assignment of the bag length variable L, if L < Lmax is established, the step 9 is entered, and if L < Lmax is not established, the step 12 is entered;

and step 12, executing a color code misplacement alarm program.

Through setting up step 701, step 801 and step 702, step 802, the assignment to fixed length variable L is progressive and carry out the check to the assignment, effectively avoid the bag length to change by a wide margin when fixed length pulls the draw bag, be favorable to promoting the stationarity of system bag machine operation, make the finished product bag uniformity after cutting better simultaneously, make bag quality high.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "front", "both ends", "lower end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a system is trailed to system's color printing bag, includes the controller, its characterized in that still includes:

an unreeling device (16) for unreeling the film (1) printed with color codes (5);

the feeding roller (3) is in transmission connection with the first motor and is used for pulling and feeding the film (1) on the unreeling device (16) forwards;

the traction roller (7) is in transmission connection with the second motor and is used for dragging and conveying the film (1) conveyed by the feeding roller (3) to the cutting assembly according to a set length;

a tension roller (4) which is arranged on the film (1) travelling path between the feeding roller (3) and the traction roller (7) and is used for buffering the film (1) conveyed by the feeding roller (3) and keeping the tension of the film (1) between the feeding roller (3) and the traction roller (7);

the cutting assembly comprises a cutter (8), a transmission device (14) for driving the cutter (8) to cut off the film (1) and a second sensor (13) for detecting the position of the cutter (8);

the first sensor (6) is arranged in front of the feeding end of the traction roller (7), and the first sensor (6) is used for detecting whether the color code (5) is in place or not when the traction roller (7) finishes traction of a set length.

2. The bag machine color printing bag tracking system of claim 1, wherein: an intermediate guide roller (2) is arranged between the unreeling device (16) and the feeding roller (3), and the intermediate guide roller (2) is used for horizontally guiding the film (1) into the feeding roller (3).

3. The bag machine color printing bag tracking system of claim 1, wherein: the cutting assembly further comprises a cutter holder (10) used for mounting the cutter (8), two ends of the cutter holder (10) are respectively connected with a guide pillar (9) which is vertically arranged, the lower ends of the guide pillars (9) are connected through a connecting plate (11), a transmission device (14) is in transmission connection with the connecting plate (11) through a pull rod (12), and an anvil (15) is arranged below the cutter (8) and matched with the cutter (8).

4. The bag machine color printing bag tracking system of claim 1, wherein: the second motor is a servo motor, and the first motor is a speed regulating motor or a servo motor or a common motor.

5. A method for tracking color printing bags of a bag making machine, which is applied to the color printing bag tracking system of the bag making machine of any one of claims 1 to 4, and is characterized by comprising the following steps:

step 1: setting a bag length parameter, at least comprising a minimum bag length Lmin and a maximum bag length Lmax, storing the parameters into a controller, and carrying out initial assignment on a bag length variable L by the controller: l= (lmin+lmax)/2;

step 2: starting the bag making machine to operate, enabling the controller to send an operation signal, enabling the transmission device to drive the cutter to operate, enabling the second sensor to detect the position of the cutter and send the position signal to the controller, enabling the second sensor to send a signal to the controller to be a material pulling stop signal when the cutter is positioned at a film cutting position, and enabling the second sensor to send a signal to the controller to be a material pulling starting signal when the cutter is positioned at a high position allowing the film to pass through;

step 3: the controller judges whether a pulling start signal is received, if the pulling start signal is received, the step 4 is entered, and if the pulling start signal is not received, the second motor does not act and continues waiting;

step 4: the controller controls the second motor to start, drives the traction roller to rotate at a high speed to carry out fixed-length traction and bag pulling on the film, and when the length value of the traction and bag pulling=L, the second motor is suspended, at the moment, the cutter 8 descends to cut the film, and the step 401 and the step 402 are sequentially carried out simultaneously in the traction and bag pulling process, wherein the step 401 is specifically that the traction and bag pulling are started and simultaneously the material pulling cut-off signal is enabled; step 402 is specifically that the controller checks a pull-material cut-off signal during pulling the bag, if the pull-material cut-off signal is not detected, step 5 is performed, and if the pull-material cut-off signal is detected, step 11 is performed;

step 5: step 4, the fixed-length pulling bag pulling is completed, and the controller does not check the pulling cut-off signal in step 402, then the controller shields the current pulling cut-off signal, and the step 6 is entered;

step 6: the controller judges whether the color code is detected according to the signal sent by the first sensor, if the color code is detected, the step 7 is carried out, and if the color code is not detected, the step 8 is carried out;

step 7: the controller assigns a value to the bag length variable L: l=lmin as the next cycle pull-draw length value, and go to step 9;

step 8: the controller assigns a value to the bag length variable L: l=lmax as the next cycle pull-draw length value, and go to step 9;

step 9: the controller checks whether the operation signal exists continuously, if the operation signal exists, the step 3 is started to carry out fixed-length traction bag pulling of the next period, and if the operation signal does not exist, the step 10 is started;

step 10, executing a normal shutdown program;

step 11, executing an overspeed shutdown procedure.

6. The method for tracking the color printing bags of the bag making machine according to claim 5, wherein the method comprises the following steps: in the step 1, a bag length adjustment length parameter a may also be set.

7. The method for tracking the color printing bags of the bag making machine according to claim 6, wherein the method comprises the following steps: when the bag length adjustment length parameter a is set in the step 1, the controller in the step 6 judges that the color code is checked, and proceeds to a step 701, and if the color code is not checked, proceeds to a step 801;

step 701, the controller assigns a value to the bag length variable L: l=l-a as the next cycle pull-bag length value, and proceeds to step 702

Step 801, the controller assigns a value to the bag length variable L: l=l+a as the next cycle pull-bag length value, and proceeds to step 802;

step 702: the controller judges whether L > Lmin is established after the assignment of the bag length variable L, if L > Lmin is established, the step 9 is carried out, and if L > Lmin is not established, the step 12 is carried out;

step 802, the controller judges whether L < Lmax is established after the assignment of the bag length variable L, if L < Lmax is established, the step 9 is entered, and if L < Lmax is not established, the step 12 is entered;

and step 12, executing a color code misplacement alarm program.

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