Dynamic control method of carriage of inkjet printer and inkjet printer

Abstract

The present application relates to a kind of dynamic control method of ink-jet printer carriage, for carriage deceleration test, respectively the actual stop position Di of carriage under each speed is obtained, i is speed mark;The actual stop position Di of carriage under each speed Vi is compared with the target stop position D0 of carriage, to obtain the comparison result Bi corresponding to each speed.In the printing work and control carriage movement, based on the moving speed Vm of carriage uniform speed movement stage, determine the comparison result Bm corresponding to speed Vm, according to comparison result Bm adjust the working parameter of carriage deceleration movement stage, wherein m ∈ i, the working parameter of adjusted carriage deceleration movement stage satisfies: the actual stop position of carriage accurately reaches target stop position.The dynamic control method of ink-jet printer carriage effectively reduces the influence of carriage mechanical deviation, driving mechanism difference on the accuracy of carriage stop position.The present application also relates to the ink-jet printer using the dynamic control method of carriage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printer technology, in particular to a dynamic control method of a carriage of an inkjet printer, and an inkjet printer using the same. BACKGROUND

[0002] In an inkjet printer, two basic mechanisms are provided, i.e. a mechanism for controlling paper conveying and a mechanism for controlling carriage movement. The two mechanisms are basically driven by a direct current motor to realize their respective functions.

[0003] Specifically, the basic action principle of the carriage movement control mechanism is that, through the engagement of the motor gear on the carriage direct current motor and the carriage driving belt, the carriage head structure carried on the carriage driving belt is driven to perform high-speed reciprocating movement on the carriage movement axis along with the rotation of the direct current motor. The high-speed reciprocating movement of the carriage head structure aims to drive the print head carried therein to eject ink onto the paper directly below in accordance with the control logic, in combination with the conveying of the paper in the direction perpendicular to the carriage movement direction, so as to complete the printing task on the whole paper.

[0004] The position precision control of the carriage movement has a very important influence on the printing effect. The position control logic is that the photoelectric sensor in the carriage head structure identifies the speed and position by reading the uniformly spaced scales on the grating bar. The principle is that, after the printer is turned on, the carriage head structure moves to the most side edge, and the position is identified as the original position of the machine by judging that the duty cycle of the direct current motor is the maximum value and there is no signal change of the position movement on the photoelectric sensor. Since the design size of the carriage main support and the carriage head structure is known, the position of the carriage head structure is identified by counting and reading the scale signals on the grating bar. Since the scale interval on the grating bar is known, the speed of the carriage head structure is calculated by the time of the signal change in the photoelectric sensor.

[0005] The above control method of the carriage movement position mainly relies on software control logic, motor performance, size of the carriage main support and the carriage head structure to ensure the accuracy of the position. The software control logic is that, the engagement of the motor gear on the carriage direct current motor and the carriage driving belt drives the carriage head structure carried on the carriage driving belt to accelerate from zero to the target speed on the carriage movement axis along with the rotation of the direct current motor, and after reaching the target speed, the carriage head structure starts to move at a constant speed. Meanwhile, during the constant speed movement, the print head ejects ink onto the paper directly below in accordance with the control logic. After the constant speed movement ends, the carriage head structure is controlled to move at a deceleration and stop at the target position. The action control of acceleration, constant speed and deceleration is repeated in a cycle until the carriage head structure stops and returns to the original position after the paper is completely printed with the content.

[0006] In the aspect of deceleration control, the existing control logic is that after the uniform speed movement ends, the DC motor does not output (the duty cycle is 0), the carriage structure uses inertia and friction to decelerate, and at the same time, the speed and position information in the deceleration process is read, and a condition for the reverse operation of the DC motor is set in the control. This deceleration control method relies heavily on the weight (inertia) and friction of the carriage structure, and in the unique case of the control method, the difference in the stop position of the print head caused by the mechanical deviation (weight, friction, etc.) of the carriage structure cannot be solved. SUMMARY

[0007] The first technical problem to be solved by the present application is to provide a dynamic control method for a carriage of an inkjet printer, which effectively reduces the influence of mechanical deviation of the carriage and difference of the driving mechanism on the accuracy of the stop position of the carriage.

[0008] The second technical problem to be solved by the present application is to provide an inkjet printer with an accurate stop position of the carriage.

[0009] The technical solution adopted by the present application to solve the first technical problem is a dynamic control method for a carriage of an inkjet printer, characterized in that: a deceleration test is performed on the carriage, the deceleration test method of the carriage is that: standard deceleration control is performed on the carriage at each speed Vi, and then the actual stop position Di of the carriage at each speed is obtained, i is the speed index; the actual stop position Di of the carriage at each speed Vi is compared with the target stop position D0 of the carriage to obtain a comparison result Bi corresponding to each speed.

[0010] When the carriage is controlled to move for printing, the comparison result Bm corresponding to the moving speed Vm of the uniform speed movement stage of the carriage is determined, and the working parameter of the deceleration movement stage of the carriage is adjusted according to the comparison result Bm, wherein m∈i, and the adjusted working parameter of the deceleration movement stage of the carriage satisfies that the actual stop position of the carriage accurately reaches the target stop position.

[0011] Preferably, the working parameter of the deceleration movement stage of the carriage includes the start timing of the deceleration movement stage and / or the starting speed of the deceleration movement stage.

[0012] As an improvement, the method of adjusting the working parameter of the deceleration movement stage of the carriage includes method A and method B:

[0013] Method A, when the comparison result Bm is that, in the moving direction of the carriage, the actual stop position Dm of the carriage exceeds the target stop position D0: the standard deceleration timing corresponding to the speed Vm is controlled, a reverse driving force is provided to the carriage, and then the starting speed of the deceleration movement stage is reduced; or the start timing Tk of the deceleration movement stage of the carriage is controlled to be earlier than the standard deceleration timing T0.

[0014] Method B, when the comparison result Bm is, in the direction of the carriage movement, the actual stop position Dm of the carriage does not reach the target stop position D0, the starting time Tk of the deceleration movement stage of the carriage is later than the standard deceleration time T0.

[0015] Preferably, in method A, the starting speed after the starting speed of the deceleration movement stage is a function of the comparison result Bm;

[0016] In method A, the advance time difference of the starting time Tk relative to the standard deceleration time T0 is a function of the comparison result Bm;

[0017] In method B, the delay time difference of the starting time Tk relative to the standard deceleration time T0 is a function of the comparison result Bm.

[0018] In order to eliminate the influence of mechanical performance, driving mechanism performance changes on the accuracy of the stop position of the carriage during the use of the printer, the printed page number and / or the printing time are accumulated when printing is performed, and when the printed page number reaches a set page number and / or the printing time reaches a set time length, the carriage is retested for deceleration.

[0019] The technical scheme adopted by the present application to solve the second technical problem is: an inkjet printer, comprising a frame, a carriage movably arranged on the frame, a driving mechanism arranged on the frame and drivingly connected with the carriage, a grating arranged in the direction of the carriage movement, and a photoelectric sensor arranged on the carriage and cooperating with the grating, characterized in that: further comprising a memory and a controller, the memory stores computer instructions, and the computer instructions are read and called by the controller to execute the aforementioned dynamic control method of the carriage.

[0020] Compared with the prior art, the inkjet printer of the present application has the advantages that: the dynamic control method of the carriage of the inkjet printer in the present application adjusts the deceleration control of the carriage based on the difference between the actual stop position of the carriage under standard deceleration control and the target stop position, thereby effectively reducing the influence of mechanical deviation of the carriage head and driving mechanism difference on the accuracy of the stop position of the carriage, and correspondingly, the position compensation processing can be cancelled each time the carriage moves, the processing of the carriage control is simplified, and the accuracy of the stop position of the carriage is ensured.

[0021] The inkjet printer applying the dynamic control method of the carriage has a more accurate stop position of the carriage, and improves the automatic adjustment capability of the printer. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a perspective view of an inkjet printer in an embodiment of the present application.

[0023] Figure 2 FIG. 2 is another view of the inkjet printer in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The application will be further described in detail below with reference to the embodiments of the drawings.

[0025] As shown in Figure 1 and Figure 2 , the inkjet printer in the embodiment comprises a frame 1, a carriage 2 movably arranged on the frame 1, a driving mechanism 3 arranged on the frame 1 and drivingly connected with the carriage 2, a grating 4 arranged along the moving direction of the carriage 2, a photoelectric sensor 5 arranged on the carriage 2 and working in cooperation with the grating 4, a memory and a controller, wherein the driving mechanism 3, the photoelectric sensor 5 and the controller are electrically connected, the photoelectric sensor 5 transmits signals to the controller, thereby the position of the carriage 2 on the frame 1 can be acquired, and the controller controls the driving mechanism 3 to work, thereby the driving of the carriage 2 can be realized.

[0026] When printing, the driving mechanism 3 drives the carriage 2 to move on the frame 1, thereby the printing is realized. Based on the cooperation of the photoelectric sensor 5 and the grating 4, the moving position of the carriage 2 can be acquired. A motor is usually arranged in the driving mechanism 3, based on the control of the rotating speed of the motor and the position data detected by the photoelectric sensor 5, the moving position of the carriage 2 can be controlled.

[0027] The memory in the embodiment stores computer instructions, which are read and called by the controller to execute the following dynamic control method of the carriage 2.

[0028] Generally, the control of the carriage 2 comprises three stages, i.e. an acceleration moving stage, a uniform moving stage and a deceleration moving stage. Firstly, the acceleration moving stage is to control the carriage 2 to accelerate from the original position with zero speed to the target speed. The uniform moving stage is to control the carriage 2 to move at the target speed, in the process of the uniform moving, the print head in the carriage 2 sprays ink to the paper below according to the control logic, and based on this, the moving speed of the carriage 2 in the uniform moving stage is taken as the working speed of the carriage 2 in the printing. The deceleration moving stage is to control the carriage 2 to decelerate and stop at the target position at the calculated time point after the uniform moving ends.

[0029] The precision of the control of the target position of the carriage 2 directly affects the printed picture, and the mechanical deviation (fluctuation of weight, friction, etc.) of the carriage 2 and the deviation of the motor performance will all cause the difference of the stop position of the carriage 2. In the prior art, the problem is solved by compensating the next stop position with the stop position error, but this compensation method will cause the deviation of the printed image position, and the error cannot be effectively solved, thereby the precision of the stop position of the carriage 2 is poor every time.

[0030] The dynamic control method of the carriage 2 of the inkjet printer in the embodiment mainly reduces or even eliminates the influence of the mechanical deviation of the carriage 2 and the difference of the driving mechanism 3 on the accuracy of the stop position of the carriage 2 from the source, so that the position of the carriage 2 stops each time is most accurate. The dynamic control method of the carriage 2 includes the following steps.

[0031] Firstly, the deceleration test is performed on the carriage 2. Usually, the carriage 2 in the printer is provided with multiple working speeds, which refer to the moving speed of the carriage 2 in the uniform moving stage. Based on the theoretical calculation of the driving speed of the driving mechanism 3, the starting point timing of the deceleration moving stage of the carriage 2 can be determined. When the standard deceleration timing of the deceleration moving stage is based on the theoretical calculation, the driving mechanism 3 is controlled to stop power output when the standard deceleration timing is reached, so that the carriage 2 gradually slows down to 0 and then stops under the action of friction and the like.

[0032] In the embodiment, the deceleration test method of the carriage 2 is specifically as follows: the standard deceleration control is performed on the carriage 2 at each speed Vi, and then the actual stop position Di of the carriage 2 at each speed is obtained, wherein i is the speed index; the actual stop position Di of the carriage 2 at each speed Vi is compared with the target stop position D0 of the carriage 2 to obtain the comparison result Bi corresponding to each speed; in the embodiment, Bi is the distance difference between the actual stop position Di of the carriage 2 and the target stop position D0 of the carriage 2.

[0033] When the carriage 2 is controlled to move for printing, one working speed is selected from the working speeds of the carriage 2 based on the determined printing task to control the movement of the carriage 2. On this basis, the comparison result corresponding to the current working speed of the carriage 2 is determined according to the comparison result Bi corresponding to each speed obtained by the foregoing deceleration test method of the carriage 2, and then the relative position difference between the target stop position and the carriage 2 affected by external factors at the current working speed of the carriage 2 is determined, and then the corresponding adjustment means is determined to reduce or even eliminate the influence of the mechanical deviation of the carriage 2, the difference of the driving mechanism 3 and other external factors on the accuracy of the stop position of the carriage 2, so that the carriage 2 can accurately stop at the target stop position, thereby ensuring the accuracy and aesthetics of the printed image.

[0034] Specifically, the comparison result Bm corresponding to the speed Vm is determined based on the moving speed Vm of the uniform moving stage of the carriage 2, and the working parameter of the deceleration moving stage of the carriage 2 is adjusted according to the comparison result Bm, wherein m∈i. The adjusted working parameter of the deceleration moving stage of the carriage 2 satisfies that the actual stop position of the carriage 2 accurately reaches the target stop position. The adjusted working parameter is the working parameter that can change the stop position of the carriage 2, which is specifically selected according to the need. In the embodiment, the working parameter of the deceleration moving stage of the carriage 2 includes the starting timing of the deceleration moving stage and / or the starting speed of the deceleration moving stage.

[0035] The method for adjusting the working parameters of the deceleration moving stage of the carriage 2 comprises method A and method B.

[0036] Method A, when the comparison result Bm is that the actual stop position Dm of the carriage 2 exceeds the target stop position D0 in the moving direction of the carriage 2, the reverse driving force is provided to the carriage 2 at the standard deceleration timing corresponding to the speed Vm, so as to reduce the starting speed of the deceleration moving stage, and the starting speed after the starting speed is reduced is a function of the comparison result Bm, and the function can be obtained based on the previous experimental test; or the starting timing Tk of the deceleration moving stage of the carriage 2 is controlled to be earlier than the standard deceleration timing T0. The advance time difference of the starting timing Tk relative to the standard deceleration timing T0 is a function of the comparison result Bm, and the function can be obtained based on the previous experimental test.

[0037] Method B, when the comparison result Bm is that the actual stop position Dm of the carriage 2 does not reach the target stop position D0 in the moving direction of the carriage 2, the starting timing Tk of the deceleration moving stage of the carriage 2 is controlled to be later than the standard deceleration timing T0. The delay time difference of the starting timing Tk relative to the standard deceleration timing T0 is a function of the comparison result Bm.

[0038] In this way, when the carriage 2 is controlled to perform the printing work, the working parameters of the deceleration moving stage of the carriage 2 are adjusted, so that the carriage 2 can accurately stop at the target position after passing through the deceleration moving stage, and the accuracy of the stop position of the carriage 2 is ensured, and the situation that the moving origin positions of the carriage 2 based on the compensation adjustment are always different is avoided.

[0039] In addition, during the long-term work, the head mechanical deviation of the carriage 2 and the driving mechanism 3 deviation also change, in order to long-term ensure the accuracy of the stop position of the carriage 2, the printing page number and / or the printing time length are accumulated when the printing work is performed, when the printing page number reaches the set page number and / or the printing time length reaches the set time length, the deceleration test of the carriage 2 is re-performed. Then the comparison results Bi corresponding to each speed obtained by the re-detection test are used to adjust the working parameters of the deceleration moving stage of the carriage 2 during the printing work.

[0040] The dynamic control method of the carriage 2 of the inkjet printer in the application adjusts the deceleration control of the carriage 2 based on the difference between the actual stop position and the target stop position of the carriage 2 under the standard deceleration control, so as to effectively reduce the influence of the head mechanical deviation of the carriage 2 and the driving mechanism 3 deviation on the accuracy of the stop position of the carriage 2, and the position compensation processing during each movement of the carriage 2 can also be cancelled, the processing of the control of the carriage 2 is simplified, and the accuracy of the stop position of the carriage 2 is ensured.

[0041] The inkjet printer using the dynamic control method of the carriage 2 has more accurate stop position of the carriage 2, and improves the automatic adjustment capability of the printer.

Claims

1. A method of dynamically controlling a carriage (2) of an inkjet printer, characterized by: The deceleration test of the carriage (2) is performed by standard deceleration control at each speed Vi, and then the actual stop positions Di of the carriage (2) at each speed are obtained, where i is the speed index; the actual stop positions Di of the carriage (2) at each speed are compared with the target stop position D0 of the carriage (2) to obtain the comparison results Bi corresponding to each speed; When the carriage (2) is controlled to move for printing, the comparison result Bm corresponding to the moving speed Vm of the uniform movement stage of the carriage (2) is determined, and the working parameters of the deceleration movement stage of the carriage (2) are adjusted according to the comparison result Bm, where m∈i, and the adjusted working parameters of the deceleration movement stage of the carriage (2) satisfy that the actual stop position of the carriage (2) accurately reaches the target stop position; The working parameters of the deceleration movement stage of the carriage (2) include the start time of the deceleration movement stage and the starting speed of the deceleration movement stage; The method for adjusting the working parameters of the deceleration movement stage of the carriage (2) includes method A and method B: Method A: when the comparison result Bm is that, in the moving direction of the carriage (2), the actual stop position Dm of the carriage (2) exceeds the target stop position D0, the starting speed of the deceleration movement stage is reduced by controlling the standard deceleration time corresponding to the speed Vm to provide a reverse driving force to the carriage (2), or the start time Tk of the deceleration movement stage of the carriage (2) is earlier than the standard deceleration time T0; Method B: when the comparison result Bm is that, in the moving direction of the carriage (2), the actual stop position Dm of the carriage (2) does not reach the target stop position D0, the start time Tk of the deceleration movement stage of the carriage (2) is later than the standard deceleration time T0.

2. The dynamic control method of the carriage (2) of the inkjet printer according to claim 1, characterized in that: In method A, the starting speed after the starting speed of the deceleration movement stage is reduced is a function of the comparison result Bm; In method A, the advance time difference of the start time Tk relative to the standard deceleration time T0 is a function of the comparison result Bm; In method B, the delay time difference of the start time Tk later than the standard deceleration time T0 is a function of the comparison result Bm.

3. The dynamic control method of the carriage (2) of an inkjet printer according to claim 1 or 2, characterized in that: When printing, the printed page number and / or the printing time length are accumulated, and when the printed page number reaches a set page number and / or the printing time length reaches a set time length, the deceleration test of the carriage (2) is performed again.

4. An inkjet printer, comprising a frame (1), a printhead carriage (2) movably mounted on the frame (1), a drive mechanism (3) mounted on the frame (1) and drivenly connected to the printhead carriage (2), a grating (4) arranged along the moving direction of the printhead carriage (2), and a photoelectric sensor (5) mounted on the printhead carriage (2) and cooperating with the grating (4), characterized in that: The dynamic control method of the carriage (2) of the inkjet printer according to any one of claims 1 to 3 is also provided, which includes a memory and a controller, the memory stores computer instructions, and the controller reads and calls the computer instructions to execute the dynamic control method of the carriage (2) of the inkjet printer.

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