Printing device for controlling tension and speed of ribbon

Abstract

The utility model relates to the technical field of printing equipment manufacturing, in particular to a printing device capable of controlling tension and speed of a colored tape, which can realize synchronous conveying of the colored tape and printing media and further overcome the problem of printing quality reduction caused by asynchronism of the colored tape and the printing media in the prior art. The color tape releasing assembly is provided with a color tape releasing rubber roller and a torque motor, the torque motor drives the color tape releasing rubber roller to rotate, the color tape collecting assembly is provided with a color tape collecting rubber roller, a stepping motor and a stepping motor control circuit, and the stepping motor drives the color tape collecting rubber roller to rotate. The stepping motor control circuit is connected with the stepping motor, and the stepping motor control circuit comprises a printing medium paper-out speed detection circuit, a paper-out side colored tape rolling detection circuit and a controller.

Description

Technical field:

[0001] The utility model relates to the technical field of printing equipment manufacturing, in particular to a printing device for controlling the tension and speed of a ribbon, which can realize synchronous conveyance of ribbon retraction and release and printing medium, thereby overcoming the problem of reduced printing quality caused by the asynchronism between the two. Background technology:

[0002] In recent years, with the continuous development of thermal printing technology, the improvement of color printing quality is also increasing year by year. The tension on the ribbon is a key factor affecting the quality of color printing. When printing, the ribbon is released by the ribbon release roller, transmitted by the print roller, and rolled up by the ribbon collection roller. The speed of the print roller, the ribbon release roller and the ribbon collection roller should correspond to the printing speed and is a fixed value. However, during the printing process, the ribbon on the ribbon release roller becomes less and the roller diameter is constantly changing. If the speed remains unchanged, the ribbon release speed will slow down, the ribbon tension will increase, and sometimes even the ribbon will be torn. For the same reason, when printing, the radius of the ribbon collection roller will increase due to the increase in the number of printed ribbons, the speed of the ribbon collection will become faster and faster, the ribbon tension will also increase, and the ribbon will be torn.

[0003] Patent document CN209160198U proposes a tension control structure. The difference is that its structure is to detect the tension of the ribbon, feed back the tension of the ribbon to the control device, and the tension of the ribbon is adjusted by the tension regulator. Patent document CN108975069B proposes a tension control structure. During its implementation, it is necessary to complete the tension detection through a more complex structure. The structure includes a floating roller and a set of conversion mechanisms for transmitting the tension to the tension motor, thereby realizing the control of the wire tension. Obviously, it occupies a large space and is not suitable for miniaturization. Summary of the invention:

[0004] The utility model aims at the shortcomings and deficiencies in the prior art and proposes a printing device which can realize the synchronous conveyance of ribbon retraction and release and printing medium, has a compact volume and a reasonable structure, and can control the tension and speed of the ribbon.

[0005] The utility model achieves this through the following measures:

[0006] A printing device for controlling ribbon tension and speed is provided with a print head, a ribbon, a printing medium, and a printing rubber roller, wherein the printing rubber roller presses the ribbon and the printing medium to the surface of the print head to realize printing, and is also provided with a ribbon release assembly and a ribbon collection assembly respectively located on the paper feed side and the paper discharge side of the print head, characterized in that the ribbon release assembly is provided with a ribbon release rubber roller and a torque motor, wherein the torque motor drives the ribbon release rubber roller to rotate, the ribbon collection assembly is provided with a ribbon collection rubber roller, a stepper motor and a stepper motor control circuit, the stepper motor drives the ribbon collection rubber roller to rotate, the stepper motor control circuit is connected to the stepper motor, and the stepper motor control circuit includes a printing medium paper discharge speed detection circuit, a paper discharge side ribbon winding detection circuit and a controller.

[0007] The printing medium paper output speed detection circuit of the utility model is provided with a roller at the printing medium and an encoder at the printing medium, wherein the encoder at the printing medium collects the rotation information of the roller at the printing medium through a connecting piece, the roller at the printing medium is in contact with the printing medium and is driven to rotate by the printing medium by friction, further, the roller at the printing medium is tangent to the connecting piece, the connecting piece and the encoder are coaxially arranged, and in a working state, the printing medium, the roller at the printing medium and the connecting piece have the same linear speed.

[0008] The utility model discloses a ribbon roller and a ribbon encoder in a paper outlet side ribbon winding detection circuit, wherein the ribbon encoder detects the rotation information of the ribbon roller via a connecting piece, the ribbon roller is in contact with the ribbon, and the ribbon drives the ribbon roller to rotate by friction, further, the ribbon encoder is connected to the connecting piece, and the connecting piece is tangent to the ribbon roller, the connecting piece and the ribbon encoder are coaxial structures, and the ribbon, the ribbon roller and the connecting piece have the same linear speed.

[0009] The controller of the utility model is implemented by an STM32 processor, and is used for receiving data sent by the printing medium paper output speed detection circuit and the paper output side ribbon winding detection circuit in real time, and adjusting the working state of the stepper motor connected to the controller. Specifically, the rotation speed of the stepper motor driving the ribbon roller is adjusted so that the speed information collected by the paper output side ribbon winding detection circuit and the speed information collected by the printing medium paper output speed detection circuit are within an error range, so as to ensure that the two are in a synchronous transmission state.

[0010] In order to ensure the ribbon tension, the utility model uses a torque motor to make the rotation speed of the ribbon placing rubber roller in the ribbon placing assembly meet the torque requirement set by the torque motor, thereby ensuring that the ribbon tension remains consistent during the printing process.

[0011] Compared with the prior art, the utility model uses a stepper motor and a torque motor to respectively control the ribbon receiving rubber roller and the ribbon releasing rubber roller: the torque motor is used to control the ribbon releasing rubber roller, which is specifically used to control the tension on the ribbon; the stepper motor is used to control the ribbon receiving rubber roller, which is specifically used to control the speed of the ribbon during printing; the two motors cooperate with each other to achieve accurate control of the ribbon tension and speed, thereby ensuring the quality of color printing. Description of the drawings:

[0012] Attached Figure 1 It is a schematic diagram of the principle of the utility model.

[0013] Figure numerals: ribbon receiving roller 1, stepping motor 2, ribbon unwinding roller 3, torque motor 4, roller shaft 5-1 at ribbon, roller shaft 5-2 at printing medium, printing roller 6, thermal print head 7, ribbon 8, controller 9, printing medium 10, connecting part 11-1 at ribbon, connecting part 11-2 at printing medium, encoder 12-1 at ribbon, encoder 12-2 at printing medium. Specific implementation method:

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] Example:

[0016] As attached Figure 1 As shown, this example provides a color printing structure, in which the ribbon receiving roller 1 and the ribbon releasing roller 3 are controlled by a stepping motor 2 and a torque motor 4 respectively, and two encoders 12 are provided, one encoder is used to measure the real-time speed of the ribbon 8 on the side of the ribbon receiving roller 1, and the other is used to detect the real-time speed of the printing medium 10;

[0017] In this example, before printing starts, the thermal print head 7 presses the ribbon 8 and the printing medium 10 onto the printing rubber roller 6. When printing starts, the stepper motor 2 and the torque motor 4 respectively drive the reeling and unreeling rubber rollers to start rotating. During continuous printing, the diameter of the ribbon roll on the reeling and unreeling rubber roller 1 becomes larger, so the speed of the reeling and unreeling ribbon becomes faster when the speed remains unchanged, and the diameter of the ribbon roll on the unreeling and unreeling rubber roller 3 becomes smaller, so the speed of the unreeling and unreeling ribbon becomes slower when the speed remains unchanged. At this time, since the torque is maintained at a fixed magnitude by the torque motor 4, the torque motor 4 increases the speed, so that the tension of the ribbon 8 remains unchanged.

[0018] The ribbon drives the output shaft of the encoder 5 to rotate: on the ribbon receiving side, the ribbon 8 drives the roller 5-1 at the ribbon to rotate through friction, and the roller 5-1 at the ribbon drives the connecting member 11-1 to rotate with a tangential structure. In this example, the connecting member adopts a coupling, and the connecting member 11-1 is coaxially arranged with the encoder 12-1 at the ribbon. The encoder 12-1 at the ribbon continuously detects the speed of the ribbon 8 through internal processing, and the encoder 12-1 continuously outputs electrical signals to the control module 9. The controller is mainly composed of an STM32 processor. Similarly, the speed of the printing medium 10 is also detected in real time; the STM32 processor receives and processes the signals from the encoder 12-2 at the printing medium and the encoder 12-1 at the ribbon, and converts them into output signals to the controller controlling the stepper motor 2, so that the speed of the ribbon 8 is always consistent with the speed of the printing medium 10; the speed of the stepper motor 2 at the ribbon receiving side is adjusted in real time according to the speed of the printing medium 10, and the speed of the ribbon 8 is controlled to be synchronized with the speed of the printing medium 10;

[0019] Through the above implementation, the speed and tension of the ribbon during the printing process can be controlled in real time to obtain better printing effects.

[0020] Compared with the prior art, the utility model uses a stepper motor and a torque motor to respectively control the ribbon receiving rubber roller and the ribbon releasing rubber roller: the torque motor is used to control the ribbon releasing rubber roller, which is specifically used to control the tension on the ribbon; the stepper motor is used to control the ribbon receiving rubber roller, which is specifically used to control the speed of the ribbon during printing; the two motors cooperate with each other to achieve accurate control of the ribbon tension and speed, thereby ensuring the quality of color printing.

Claims

1. A printing device for controlling ribbon tension and speed, comprising a print head, a ribbon, a printing medium, and a printing rubber roller, wherein the printing rubber roller presses the ribbon and the printing medium to the surface of the print head to achieve printing, and further comprising a ribbon release assembly and a ribbon collection assembly located at the paper feed side and the paper discharge side of the print head, respectively, characterized in that: The ribbon unwinding assembly is provided with a ribbon unwinding roller and a torque motor, wherein the torque motor drives the ribbon unwinding roller to rotate; the ribbon receiving assembly is provided with a ribbon receiving roller, a stepping motor and a stepping motor control circuit, wherein the stepping motor drives the ribbon receiving roller to rotate, and the stepping motor control circuit is connected to the stepping motor, and the stepping motor control circuit includes a printing medium paper output speed detection circuit, a paper output side ribbon winding detection circuit and a controller.

2. A printing device for controlling ribbon tension and speed according to claim 1, characterized in that: The printing medium paper output speed detection circuit is provided with a roller at the printing medium and an encoder at the printing medium, wherein the encoder at the printing medium collects rotation information of the roller at the printing medium via a connecting piece, the roller at the printing medium is in contact with the printing medium and is driven to rotate by the printing medium by friction, and in a working state, the printing medium, the roller at the printing medium and the connecting piece have the same linear speed.

3. A printing device for controlling ribbon tension and speed according to claim 1, characterized in that: The ribbon winding detection circuit on the paper outlet side is provided with a ribbon roller and a ribbon encoder, wherein the ribbon encoder detects the rotation information of the ribbon roller via a connecting piece, the ribbon roller is in contact with the ribbon, and the ribbon drives the ribbon roller to rotate by friction, and the ribbon, the ribbon roller and the connecting piece have the same linear speed.

4. A printing device for controlling ribbon tension and speed according to claim 1, characterized in that: The controller is implemented using an STM32 processor, and is used to receive data sent by the printing medium paper output speed detection circuit and the paper output side ribbon winding detection circuit in real time, and adjust the working state of the stepper motor connected to the controller so that the speed information collected by the paper output side ribbon winding detection circuit is consistent with the speed information collected by the printing medium paper output speed detection circuit.

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