Dynamic balance damping device for ink vehicle of large-format ink-jet plotter and design method

Abstract

The invention relates to a dynamic balance damping device for an ink vehicle of a large-format ink-jet plotter and a design method. The dynamic balance damping device comprises a balancing weight, a balancing weight driving synchronous belt, a middle transmission shaft, a balancing weight power input belt wheel, a middle synchronous belt, a balancing weight driving main belt wheel and a balancing weight driving driven wheel. A middle rotating shaft is installed on a machine frame of the ink-jet plotter, a balancing weight power input belt wheel is fixedly installed at the end, close to an output shaft of an ink vehicle driving motor, of the middle rotating shaft, a middle synchronous belt is in transmission connection with the balancing weight power input belt wheel and an ink vehicle driving driving wheel, and a balancing weight driving main belt wheel is fixedly installed at the other end of the middle rotating shaft. The balancing weight driving synchronous belt is in transmission connection with the balancing weight driving main belt wheel and the balancing weight driving driven wheel; a balancing weight connecting block is fixedly arranged on the balancing weight driving synchronous belt, a balancing weight is fixed on the balancing weight connecting block, and the moving direction of the balancing weight is always opposite to the moving direction of the ink vehicle. The whole machine vibration caused by the inertia force of the ink vehicle in the printing operation process of the large-format printer can be effectively reduced, and the printing precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of control of large-format inkjet plotters, in particular to a dynamic balancing vibration reduction device for an ink carriage of a large-format inkjet plotter and a design method thereof. Background Art

[0002] Existing inkjet printers typically use a motor-driven synchronous belt to achieve linear reciprocating motion. At high speeds or with frequent starts and stops, inertia can cause vibrations in the ink carriage assembly and the entire machine. This vibration not only causes misalignment of the printhead, leading to unstable ink droplet ejection and poor printing accuracy, but also worsens mechanical wear and shortens the ink carriage's service life.

[0003] The common vibration reduction technologies on the market currently include the following:

[0004] 1. Spring shock absorber: uses the elastic characteristics of the spring to absorb vibration energy, but its response speed is slow and it is easily affected by load changes.

[0005] 2. Hydraulic or pneumatic dampers: absorb vibrations through the damping effect of the fluid and have good stability, but the structure is complex and the cost is high.

[0006] 3. Passive vibration reduction devices: such as rubber pads, although simple and easy to use, have limited vibration reduction effects.

[0007] The aforementioned methods all have limitations in practical applications for large-format inkjet plotters. They cannot meet the plotter's requirements for high precision, long life, and efficient and stable operation. They also lack dynamic balancing capabilities and have limited vibration reduction effects. Therefore, a new vibration reduction device is urgently needed to address this issue. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the present invention provides a dynamic balancing and vibration reduction device for an ink carriage of a large-format inkjet plotter and a design method thereof.

[0009] One of the above-mentioned purposes of the present invention is achieved by the following technical solutions:

[0010] A dynamic balancing and vibration reduction device for an ink carriage of a large-format inkjet plotter, comprising a counterweight, a counterweight drive timing belt, an intermediate transmission shaft, a counterweight power input pulley, an intermediate timing belt, a counterweight drive main pulley, and a counterweight drive driven pulley;

[0011] The intermediate rotating shaft is installed on the frame of the inkjet plotter, and the intermediate rotating shaft is arranged parallel to the output shaft of the ink carriage drive motor. The counterweight power input pulley is fixedly installed on one end of the intermediate rotating shaft close to the output shaft of the ink carriage drive motor, and the intermediate synchronous belt is transmission-connected with the counterweight power input pulley and the ink carriage drive active wheel, and the other end of the intermediate rotating shaft is fixedly installed with the counterweight drive main pulley; a counterweight drive driven pulley is installed on the frame of the large-format inkjet plotter near one end where the ink carriage drive driven wheel is installed through a shaft support, and the counterweight drive synchronous belt is transmission-connected with the counterweight drive main pulley and the counterweight drive driven wheel; a counterweight connecting block is fixedly installed on the counterweight drive synchronous belt, and the counterweight is fixed on the counterweight connecting block. The counterweight is connected to a counterweight linear slide fixed on the frame of the inkjet plotter, and the counterweight linear slide is arranged parallel to the ink carriage linear slide; the movement direction of the counterweight is always set in the opposite direction of the movement direction of the ink carriage.

[0012] The second object of the present invention is achieved by the following technical solutions:

[0013] A design method for a dynamic balancing and vibration reduction device for an inkjet plotter of a large-format inkjet type, comprising:

[0014] Step 1: Set parameters

[0015] Assume that the pitch diameter of the ink carriage driving wheel is r1, the pitch diameter linear velocity is v1; the counterweight block power input pulley pitch diameter is r2, the pitch diameter linear velocity is v2, and the angular velocity is ω; the counterweight driving main pulley pitch diameter is r3, the pitch diameter linear velocity is v3, and the angular velocity is ω; the mass of the ink carriage is m A , speed v A , average speed V A , acceleration a A , one-way movement time t, travel S A The mass of the counterweight is m B , speed v B , average speed V B , acceleration a B , one-way movement time t, travel S B

[0016] Step 2: Based on the parameters set in step 1, we have:

[0017] v1=v A =v2=ω·r2 (1)

[0018] From formula (1), we can get:

[0019] ω=v1 / r2 (2)

[0020] From formula (2), we can get:

[0021] v3=v1·(r3 / r2)=v A (r3 / r2) = v B (3)

[0022] From formula (3), we can get:

[0023] v A / v B =r2 / r3 (4)

[0024] According to the characteristics of synchronous belt transmission:

[0025] v A / v B =V A / V B =a A / a B =r2 / r3 (5)

[0026] From formula (5), we can get: If the inertia forces of the ink carriage and the counterweight are offset, then we should have

[0027] m A / m B =a B / a A =r3 / r2 (6)

[0028] S A / S B =r2 / r3 (7).

[0029] The advantages and positive effects of the present invention are:

[0030] Based on the principle of dynamic balancing, this invention has developed a dynamic balancing device for the ink carriage of large-format printers. This device effectively reduces overall machine vibration caused by the inertial force of the ink carriage during printing, thereby improving printing accuracy. The plotter's print resolution was set to 720×720 DPI, and coated paper was selected in black and white, fine graphics mode. A 320-line-pair test chart in PDF format was printed. After printing, the K-color 320-line-pair chart on the printed pattern was observed using a 10x magnifying glass. The printing effect after using the dynamic balancing device was significantly improved compared to before use. The two lines were clearly distinguishable, with no adhesion or breakage between lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the inking carriage counterweight motion system of the large-format inkjet plotter of the present invention;

[0032] Figure 2 This is a schematic diagram of the dynamic balancing device for the inkjet plotter of the large format inkjet plotter of the present invention. Figure 1 ;

[0033] Figure 3This is a schematic diagram of the dynamic balancing device for the inkjet plotter of the large format inkjet plotter of the present invention. Figure 2 . DETAILED DESCRIPTION

[0034] The structure of the present invention will be further described below with reference to the accompanying drawings and through examples. It should be noted that the present examples are descriptive rather than restrictive.

[0035] The ink carriage in existing large-format inkjet plotters is driven by a synchronous belt. The carriage is connected to a linear guide rail 12 via a slider with embedded ball bearings. A carriage connection block 5 is fixed to the carriage's lower end, fixed to a set position on the synchronous belt. The carriage's reciprocating lateral motion is achieved as the synchronous belt reciprocates. This synchronous belt is the carriage drive belt, and the carriage drive belt, the carriage drive pulley, the carriage drive pulley, the carriage drive motor, the carriage, and the ink supply piping comprise the carriage assembly. A linear guide rail is positioned to one side of the carriage drive belt, perpendicular to the carriage's gravity. The carriage drive belt only needs to overcome the sliding friction of the ball bearings to drive the carriage's reciprocating linear motion along the linear guide rail. The paper is driven by a paper feed servo motor, fed in equal steps, alternating with the carriage's motion, ultimately forming a continuous pattern on the paper.

[0036] Through a combination of hardware and software, the operation of the inking carriage drive motor can be controlled, achieving uniform acceleration, uniform speed, and uniform deceleration. By reading the feedback value from the optical scale, the inking carriage stroke can be precisely controlled. Because the inertial reaction force during acceleration and deceleration is transmitted to the inking carriage drive motor via the inking carriage drive belt, vibrations can occur in the inking carriage assembly and the entire plotter. This vibration can cause unintended relative motion between the inking carriage and the printing paper, preventing ink droplets from adjacent strokes from accurately intersecting, resulting in reduced printing accuracy.

[0037] The present invention is a large-format inkjet plotter ink carriage dynamic balancing and vibration reduction device, see Figure 1-Figure 3The invention is characterized in that the dynamic balancing and vibration reduction device utilizes a counterweight linear motion mechanism synchronously driven by the ink carriage drive, comprising a counterweight 16, a counterweight drive timing belt 6, an intermediate transmission shaft 10, a counterweight power input pulley 3, an intermediate timing belt 2, a counterweight drive main pulley 8, and a counterweight drive driven pulley 14. The intermediate rotating shaft is mounted on the frame 11 of the inkjet plotter and is arranged parallel to the output shaft of the ink carriage drive motor 9. The counterweight power input pulley is fixedly mounted on one end of the intermediate rotating shaft near the output shaft of the ink carriage drive motor. The intermediate timing belt is drivingly connected to the counterweight power input pulley and the ink carriage drive driving pulley 1. The counterweight drive main pulley is fixedly mounted on the other end of the intermediate rotating shaft. A counterweight drive driven pulley is mounted on the frame of the large-format inkjet plotter near the end where the ink carriage drive driven pulley is mounted via a shaft support. The counterweight drive timing belt is drivingly connected to the counterweight drive main pulley and the counterweight drive driven pulley. A counterweight connecting block 7 is fixedly mounted on the counterweight drive timing belt. The counterweight 16 is fixed to the counterweight connecting block. The counterweight is connected to a counterweight linear slide 15 fixed to the inkjet plotter frame. The counterweight linear slide is arranged parallel to the linear slide of the inkjet plotter. The counterweight's movement direction is always opposite to that of the inkjet plotter. Because the counterweight and the inkjet plotter 13 start and stop simultaneously, the time it takes for the speed of the counterweight and the inkjet plotter to change is equal.

[0038] Assume the mass of the ink cart is m A , the acceleration is a A , then the inertia force F of the ink car A =m A ·a A , let the average speed of the ink carriage be V A , one-way movement time t, then the ink car travel S A =V A ·t. Assume the mass of the counterweight is m B , the acceleration is a B , then the inertia force of the counterweight F B =m B ·a B , let the average speed of the counterweight be V B , one-way movement time t, then the weight block stroke S B =V B In order to achieve the balance of inertia force between the counterweight and the ink carriage, the inertia force of the ink carriage and the counterweight must be the same in magnitude but opposite in direction, that is, F A =F B , m A ·a A =m B ·a BTherefore, the movement speed of the counterweight can be adjusted according to the actual installation movement space of the counterweight by adjusting the gear ratio of the ink carriage driving active wheel and the counterweight power input pulley, thereby determining the ratio of the speed change of the ink carriage and the counterweight per unit time, that is, the acceleration ratio. Based on this ratio, the mass ratio of the ink carriage and the counterweight is determined, thereby achieving the effect of equal magnitude and opposite direction of the inertia force of the ink carriage and the counterweight.

[0039] The design method of the large-format inkjet plotter inking carriage dynamic balancing and vibration reduction device of the present invention comprises:

[0040] 1) Determination of counterweight weight and stroke parameters

[0041] In theory, the weights and their movement can be arranged in three ways:

[0042] a) The mass form of the counterweight and the ink carriage;

[0043] b) The mass of the counterweight is greater than that of the ink carriage, and the stroke is smaller than that of the ink carriage;

[0044] c) The weight of the counterweight is less than the mass of the ink carriage, and the stroke is greater than the ink carriage.

[0045] The ink carriage and counterweight motion mechanism of the large-format inkjet plotter are shown in the attached figure. Figure 1 As shown. In order to obtain a larger belt speed ratio between the ink carriage driving synchronous belt 4 and the counterweight driving synchronous belt, the output shaft of the ink carriage driving motor can be installed with pulleys of different pitch diameters. In order to reduce the installation space of the ink carriage driving active wheel and reduce the processing cost, the output pulley width is increased in the present invention to drive the ink carriage and the counterweight at the same time. Assume that the pitch diameter r1 and pitch diameter linear velocity v1 of the ink carriage driving active wheel; the pitch diameter r2, pitch diameter linear velocity v2 and angular velocity ω of the counterweight power input pulley; the pitch diameter r3, pitch diameter linear velocity v3 and angular velocity ω of the counterweight driving main pulley; the mass of the ink carriage is m A , speed v A , average speed V A , acceleration a A , one-way movement time t, travel S A The mass of the counterweight is m B , speed v B , average speed V B , acceleration a B , one-way movement time t, travel S B Ignoring factors such as the instantaneous deformation of the synchronous belt, we have:

[0046] v1=v A =v2=ω·r2 (1)

[0047] From formula (1), we can see

[0048] ω=v1 / r2 (2)

[0049] From formula (2), we can see

[0050] v3=v1·(r3 / r2)=v A (r3 / r2) = v B (3)

[0051] From formula (3), we can see

[0052] v A / v B =r2 / r3 (4)

[0053] From the characteristics of synchronous belt transmission, we can see

[0054] v A / v B =V A / V B =a A / a B =r2 / r3 (5)

[0055] From formula (5), we can know that if the inertia forces of the ink carriage and the counterweight are offset, we should have

[0056] m A / m B =a B / a A =r3 / r2 (6)

[0057] S A / S B =r2 / r3 (7)

[0058] From equations (6) and (7), it can be seen that by reasonably designing the counterweight power input pulley and the pitch diameter of the counterweight driving main pulley, three dynamic balancing and vibration reduction devices of the ink wheel with different motion modes can be obtained.

[0059] 2) Structural design of dynamic balancing vibration reduction device

[0060] In this invention, the widened output pulley of the ink carriage drive motor allows it to simultaneously drive two synchronous belts: the ink carriage drive belt and the intermediate belt. The ink carriage drive belt drives the ink carriage, with the linear velocity of the ink carriage coinciding with the pitch velocity of the ink carriage drive synchronization. The intermediate belt drives the counterweight power input pulley, which transmits power to the counterweight drive main pulley via a shared drive shaft, thereby driving the counterweight drive belt. To reduce the structural dimensions of large-format inkjet plotters and minimize the space required for the dynamic balancing device, a design approach with a larger counterweight and a smaller counterweight stroke is preferred.

[0061] Taking the printer in the present invention as an example, the output pulley of the ink carriage drive motor is MXL type, with 20 teeth and a pitch diameter of 12.94mm. The counterweight block power input pulley is 40 teeth and a pitch diameter of 25.87mm. The counterweight drive main pulley is also 20 teeth and a pitch diameter of 12.94mm. The ink carriage supplies ink through a hose, with a total weight of about 1.6kg. The ink carriage stroke is 960mm, so the total mass of the counterweight block should be 3.2kg and the stroke is 480mm.

[0062] The ink carriage is fixed on the upper stroke section of the ink carriage drive synchronous belt, and the counterweight is fixed on the lower stroke section of the counterweight drive synchronous belt. When the ink carriage accelerates to the left from the initial position, the counterweight accelerates to the right at the same time. The ink carriage and the counterweight start and stop synchronously. Therefore, the inertia forces of the ink carriage and the counterweight cancel each other out.

[0063] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A dynamic balancing and vibration reduction device for an inkjet plotter of a large format inkjet plotter, characterized by: It includes a counterweight, a counterweight drive timing belt, an intermediate transmission shaft, a counterweight power input pulley, an intermediate timing belt, a counterweight drive main pulley and a counterweight drive driven pulley; The intermediate rotating shaft is installed on the frame of the inkjet plotter, and the intermediate rotating shaft is arranged parallel to the output shaft of the ink carriage drive motor. The counterweight power input pulley is fixedly installed on one end of the intermediate rotating shaft close to the output shaft of the ink carriage drive motor, and the intermediate synchronous belt is transmission-connected with the counterweight power input pulley and the ink carriage drive active wheel, and the other end of the intermediate rotating shaft is fixedly installed with the counterweight drive main pulley; a counterweight drive driven pulley is installed on the frame of the large-format inkjet plotter near one end where the ink carriage drive driven wheel is installed through a shaft support, and the counterweight drive synchronous belt is transmission-connected with the counterweight drive main pulley and the counterweight drive driven wheel; a counterweight connecting block is fixedly installed on the counterweight drive synchronous belt, and the counterweight is fixed on the counterweight connecting block. The counterweight is connected to a counterweight linear slide fixed on the frame of the inkjet plotter, and the counterweight linear slide is arranged parallel to the ink carriage linear slide; the movement direction of the counterweight is always set in the opposite direction of the movement direction of the ink carriage.

2. A design method for a dynamic balancing and vibration reduction device for an inkjet plotter of a large-format inkjet plotter according to claim 1, characterized in that: The steps include: Step 1: Set parameters Assume that the pitch diameter of the ink carriage driving wheel is r1, the pitch diameter linear velocity is v1; the counterweight block power input pulley pitch diameter is r2, the pitch diameter linear velocity is v2, and the angular velocity is ω; the counterweight driving main pulley pitch diameter is r3, the pitch diameter linear velocity is v3, and the angular velocity is ω; the mass of the ink carriage is m A , speed v A , average speed V A , acceleration a A , one-way movement time t, travel S A The mass of the counterweight is m B , speed v B , average speed V B , acceleration a B , one-way movement time t, travel S B Step 2: Based on the parameters set in step 1, we have: v1=v A =v2=ω·r2 (1) From formula (1), we can get: ω=v1 / r2 (2) From formula (2), we can get: v3=v1·(r3 / r2)=v A ·(r3 / r2)=v B (3) From formula (3), we can get: in A / in B =r2 / r3 (4) From the characteristics of synchronous belt transmission, we can get: in A / in B =V A / V B =a A / and B =r2 / r3 (5) From formula (5), we can get: If the inertia forces of the ink carriage and the counterweight are offset, then we should have m A / m B =a B / and A =r3 / r2 6) S A / S B =r2 / r3 (7)。

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