KR20160117667A - method of tension control for printing ribbon using motor - Google Patents

Abstract

The present invention provides an apparatus to control a tension of a printing ribbon adopting a thermal transfer printing method used in an automatic medicine packaging device or a thermal transfer printer which adopts a method comprising: an initial torque applying step of applying an initial torque value, operable in all the area of the printing ribbon, to each of a driving motor and a driven motor of a driven part in a case where a new printing ribbon is inserted into the driven part of the printing ribbon; a ribbon sensing step of sensing whether the printing ribbon exists in a driven part of an unwinding roll if power is supplied to the automatic medicine packaging device or the thermal transfer printer; a pulse detection step of making a pulse detection unit detect pulses of a driving part and a driven part of the printing ribbon in a case where the printing ribbon exists in the driven part of the unwinding roll in the ribbon sensing step; a coefficient conversion step of converting the pulses of the driving part and the pulses of the driven part into coefficients after the pulses of the driving part and the driven part are detected; a coefficient ratio calculation step of calculating a ratio between the coefficient of the driving part and the coefficient of the driving part if the coefficients are converted; and a motor torque applying step of applying a driving motor torque and a driven motor torque, corresponding to the ratio between the calculated coefficients, to the driving motor and the driven motor in accordance with the ratio between the coefficients. The present invention has the effects of preventing micro-vibration on the printing ribbon; prevents overlapped printing on a printing paper; makes the motor torque of the driving motor and the driven motor precise; makes it easy to control rotation; and unwinds the printing ribbon in a state of maintaining constant tension.

Description

TECHNICAL FIELD [0001] The present invention relates to a ribbon tension control method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a printing ribbon tension control method, and more particularly, to a printing ribbon tension control method using a motor for a driving portion and a follower portion in order to eliminate step vibration of a printing ribbon follower portion in tension control of a printing ribbon using a thermal transfer printing method The present invention relates to a printing ribbon tension control method using a motor that is capable of rotating a driving motor in a forward direction and stopping the driven motor in a state in which a motor torque is applied thereto so that the tension of the printing ribbon can be kept constant in accordance with the remaining amount of the printing ribbon.

Generally, in a medicine automatic packing machine or a thermal transfer type printing machine, various data necessary for roll paper are printed by a thermal transfer method.

The thermal transfer method uses a thermal printing type apparatus as a thermal transfer apparatus used for a method of recording data by applying heat such as a thermal transfer facsimile or a bank cash dispenser.

The thermal transfer device is a laser printing type device in which toner is used and an ink printing type device in which ink is used. A roll paper of a thermal transfer film or a thermal transfer paper is used for a thermal transfer printing type device.

The thermal transfer printing method uses a printer composed of a thermal printing head (TPH) to apply heat to the printing material of the roll paper, thereby fusing / pressing predetermined data onto the recording paper.

In the conventional automatic medicine packing machine for keeping the tension of the roll paper at a constant level, a general automatic medicine packing machine of the present invention can be used in a hospital or a pharmacy when a prescription of a doctor or a pharmacist is inputted into a computer, And the discharged tablets are discharged and collected automatically, and the collected tablets are completely packed and dispensed. The heater assembly that packs the tablets below the discharge hopper collecting the tablets, and the packed medicine papers A discharge slider is provided.

A printer, which is composed of a thermal transfer head for printing on a roll paper, is provided in front of the heater assembly, and a roll on which a roll paper is wound is inserted into a roll guide below the printer.

Korean Registered Patent No. 10-1405857 If you look at the printing ribbon saving method (June 11, 2014) of the automatic medicine packing machine,

A pressing step of pressing the printing ribbon and the wrapping paper to cause the separated print ribbon and the wrapping paper to come into close contact when the execution information of the medicine wrapping is inputted while the print ribbon and the wrapping paper are inserted; A printing ribbon braking step of braking the follower of the printing ribbon to stop unwinding of the printing ribbon; A papermaking sheet feeding step of operating the driving unit of the sheet transporting unit so as to be transported only for packaging in the sheet space of the packaging sheet; A printing ribbon braking releasing step of releasing braking of the follower of the printing ribbon; A packaging paper printing step of printing packaging information on the packaging paper while simultaneously transporting the printing ribbon and the packaging paper; A wrapping paper printing completion step of braking the driven portion of the printing ribbon to stop unwinding of the printing ribbon when printing of the wrapping paper is completed; A print ribbon which causes the adhered print ribbon and the wrapping paper to be spaced apart, and a step of unclamping the wrapping paper; The printing ribbon is transported only when printing on the wrapping paper, and the feeding of the printing ribbon is stopped when the non-printing is performed.

The driving motor of the printing ribbon driving unit and the follower motor of the follower unit use a stepping motor. When the stepping motor of the driving unit is above a certain torque, the print ribbon is not fed and only the stepping motor is turned. The motor controls the tension of the printing ribbon by using the electronic brake function of the step motor. In the non-printing area, the voltage is applied to the step motor to prevent the printing ribbon from being fed by the braking force. The driven motor is controlled and the print ribbon is wound and wounded.

However, in the conventional technique, the stepping motor applies a braking force to the printing ribbon at a rotating step angle, causing microvibration due to the step angle.

In addition, in the above-mentioned prior art, there is a problem that fine overlap printing is caused on the roll paper due to the vibration of the print ribbon due to the step angle by the step motor of the driving part and the follower part, and the quality of printing is not good.

Further, in the related art, the torque limit is applied to the wipes and the friction pads of the step motor to apply a torque to drive the driving portion at a constant speed, thereby causing a change in torque depending on the ambient humidity around the motor and the wear amount of the friction pad .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a printing apparatus, The drive motor rotates in the forward direction according to the ratio of the count value of the sensor and the count value of the follower sensor, and the driven motor is stopped in a state in which the motor torque is applied, but the drive shaft is given a torque slightly larger than the follower axis, Which does not cause step vibrations in the printing ribbon, and which does not cause fine superimposition printing on the printing paper while the printing ribbon is held in a state in which the printing ribbon is maintained at a constant tension.

In order to accomplish the above object, the present invention provides a tension adjusting device for a printing ribbon using a thermal transfer printing method used in an automatic medicine packing machine or a thermal transfer printing press, An initial torque imparting step of giving an initial torque value that can operate in the entire area of the print ribbon to each of the drive motor and the driven motor of the driven part; A ribbon detecting step of detecting whether or not a printing ribbon is present in the driven part of the paper roll when the power is inputted to the automatic medicine packing machine or the thermal transfer type printing machine; A pulse detecting step of detecting a pulse of a driving part and a follower part of the printing ribbon in the pulse detecting part when the ribbon is in the follower part of the sea- A count value conversion step of converting a driving unit pulse and a follower pulse after the pulse detection of the driving unit and the follower unit into coefficient values; Calculating a ratio of a driving unit coefficient to a follower coefficient when the coefficient is converted; And a motor torque giving step of giving the driving motor torque and the driven motor torque corresponding to the ratio of the counted values to the driving motor and the driven motor according to the ratio of the counted values.

In addition, in the ribbon sensing step, if it is detected that there is no print ribbon on the driven shaft of the sea-island roll, an error (error) is outputted from the display unit or the warning unit and an initial torque input step of inputting the initial torque is performed.

Further, in the motor torque applying step, the driving motor rotates in a forward direction according to the ratio of the driving unit coefficient value and the follower coefficient value of the print ribbon, and the driven motor is stopped in a state in which the motor torque is applied, Grant,

In the present invention, since the driving portion and the follower portion of the print ribbon are driven by the motor, no step vibration occurs in the motor, and no fine vibration is generated in the print ribbon.

In addition, the present invention has an effect that fine vibrations do not occur in the print ribbon, and overlap printing does not occur on the print paper.

Further, the present invention has an effect that the input torque and the output torque of the motor are linearly proportional so that the motor torque for driving the driving portion and the driven portion is accurate and rotation control is easy.

In addition, the present invention has an effect that the driving portion is rotated by slightly larger motor torque than the driven portion, and the follower portion is wound with a motor torque by winding a printing ribbon, and the printing ribbon is held at a constant tension.

1 is a state diagram of a drive motor and a braking motor in a state in which a print ribbon and a thermal transfer head of the present invention are combined;
Fig. 2 is a view showing how the driving motor and the braking motor are coupled to the main body bracket of the present invention. Fig.
Fig. 3 is a view showing a state where the control unit is coupled to the drive motor and the braking motor according to the present invention.
Figure 4: Diagram of DC motor characteristics.
5 is a step diagram of a method of controlling a ribbon tension of a printing ribbon using the motor of the present invention.
6 is a flowchart of a control method of a printing ribbon tension control method using the motor of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The thermal transfer printing system is a device for outputting letters and pictures by applying heat to a thermal paper or thermal film produced by heat by means of a dot heating element or the like. It is used for a medicine automatic packing machine, a facsimile, a point of sale information management system (POS: point -of-sale, electronic cash register (ECR), bar code printer, automatic teller machine (ATM) and ticket vending machine.

The thermal transfer printing method prints the printing information on the printing paper. The medicine packing machine prints the medicine taking time, the number of times of taking, the pharmacy for pharmacy, etc., and the facsimile machine prints the transmitted letters, pictures, figures, In an information management system (POS: point-of-sale), the expiration date of the article, the date of manufacture, the manufacturer and the content of the article are printed, and an electronic cash register (ECR) and an automatic cash dispenser (ATM) The date and time, the seat number, the amount of money, etc. are printed on the ticket vending machine.

When printing information is printed on the printing paper, the cam 35 is rotated by a rotation of the moving motor 35 in a state where the outer peripheral surface of the cam of the moving motor 35 is in contact with the bearing formed on the movable plate 20, The lift of the movable plate 20 is completed when the plate 20 is raised and the movable plate 20 is positioned on the projecting surface of the cam.

In general, thermal transfer printing includes a main body bracket 10 fixedly mounted on a lower portion of a main body, a movable plate 20 disposed adjacent to a side surface of the main body bracket 10 so as to be movable up and down, A printing ribbon cartridge detachably mounted on the movable plate 20 while being detachably mounted on the movable plate 20 so as to be detachably attached to the movable plate 20, A thermal printing head 38 (TPH: thermal printing head) for printing on paper, and a moving motor 35 for moving the thermal transfer head 38 up and down.

A printing paper and a printing ribbon 40 are stacked and placed between the thermal transfer head 38 provided on the movable plate 20 and the printing roller 32 provided on the main bracket 10, 38 are heated according to the data in the printing section of the printing paper to print the data on the printing paper.

Since the printing roller 32 is installed in the main bracket 10 and the thermal transfer head 38 is installed in the movable plate 20, The movable plate 20 is located at a position where the movable plate 20 is moved downward and is separated from the print roller 32 and the thermal transfer head 38. [

A movable motor 35 for moving the movable plate 20 upward and downward is formed on the rear surface of the main body bracket 10 and a cam is formed on the rotating shaft of the moving motor 35. By the rotation of the moving motor 35, And the movable plate 20 is moved up and down.

As the cam of the rotation shaft rotates, the movable plate 20 is moved upward by raising the bearing provided on the movable plate 20.

The thermal transfer head 38 formed on the movable plate 20 is lifted by the elevation of the movable plate 20 so that the print ribbon 40 and the printing paper are pressed against each other by being prevented from rising by the printing roller 32.

When the cam continues to rotate, the movable plate 20 moves downward due to its own weight, and a spring can be installed between the main bracket 10 and the movable plate 20 to assist it. One or more guide means may be provided to guide the movement of the movable plate 20 up and down.

A driving motor 35 for driving a driving reel or driving part of the printing ribbon 40 mounted on the printing ribbon cartridge is formed on the back surface of the movable plate 20 and a driven reel And a driven motor 33 for braking the unloading portion.

The driving reel or driving unit of the printing ribbon 40 transfers the printing ribbon 40 by using a motor as a driving motor. When the driving motor 35 of the driving unit exceeds a predetermined torque, the printing ribbon 40 is not fed There is a torque limiting function in which only the motor 35 is turned.

Here, the constant torque is a torque when the driving motor 35 of the driving unit is driven and the printing ribbon 40 is cut, so that only the driving motor 35 rotates at a constant torque or higher, so that the printing ribbon 40 is not cut .

A driving means such as a driving gear 37 for transmitting the driving force from the driving motor 35 to the driving reel is provided between the driving motor 35 and the driving reel, 33 are provided with transmission means such as a driven gear 34 for cutting the braking force to the braking reel.

The driving unit of the printing ribbon 40 uses a motor as a driving motor and the driving motor 36 performs a rotating function by an applied current so that the printing ribbon 40 is fed and wound.

A roll gear which is constituted by a motor gear which is extrapolated to the rotating shaft of the driving motor 36 and which is extrapolated to the rotating shaft of the winding roll 39 of the print ribbon 40 is constituted so that the driving gear 37 is engaged with the motor gear and the roll gear simultaneously And is linked to the motor gear and the roll gear.

In the case of a spur gear, the rotating shaft of the driving motor 36 and the rotating shaft of the take-up roll 39 are located on a straight line parallel to each other, and the bevel gears The rotating shaft of the driving motor 36 and the rotating shaft of the winding roll 39 are positioned at right angles.

The driving motor 36 is coupled to the motor gear so that the rotating shaft is coupled to the motor gear and is coupled to the other side of the main bracket 10. When the motor gear and the roll gear are spur gears, A motor bracket is formed on the body of the motor bracket, and the motor bracket is coupled to the main bracket 10 to fasten the driven motor to the motor bracket.

In consideration of the ratio of the rotation of the drive motor 36 to the rotation of the print ribbon 40, the motor gear is configured to have a smaller diameter than the roll gear.

The follower portion of the print ribbon 40 uses a motor as a driven motor and the driven motor 33 stops as a motor torque is applied so as to perform an electronic brake function by a current applied thereto, So that the printing ribbon 40 is prevented from being conveyed in the non-printing area by the braking force and the printing ribbon 40 is conveyed in the printing area.

And a roll gear which is constituted by a motor gear which is extrapolated to the rotary shaft of the driven motor 33 and which is extrapolated to the rotary shaft of the sea rolls 31 of the print ribbon 40 so that the driven gear 34 is engaged with the motor gear and the roll gear simultaneously And is linked to the motor gear and the roll gear.

In the case of a spur gear, the rotary shaft of the driven motor 33 and the rotary shaft of the sea-wound roll 31 are located on a straight line parallel to each other, and the bevel gear The rotary shaft of the driven motor 33 and the rotary shaft of the sea roll 31 are positioned at right angles.

When the motor gear and the roll gear are a spur gear, the driven motor 33 is coupled to the motor gear, A motor bracket is formed on the body of the motor bracket, and the motor bracket is coupled to the main bracket 10 to fasten the driven motor to the motor bracket.

In consideration of the ratio of the rotation of the driven motor (33) to the rotation of the print ribbon (40), the motor gear is configured to have a smaller diameter than the roll gear.

A braking torque which prevents the driven motor 33 from rotating is applied by applying a current to the driven motor 33 so that the printed ribbon 40 is not released from the driven reel of the print ribbon 40, do.

A control unit 50 is configured to control the driving motor 36 and the driven motor 33. The control unit 50 includes a central processing unit (CPU) 52, a memory and a control program, The motor 36 and the driven motor 33 are controlled.

The control unit 50 may use a microprocessor to perform various functions such as a medicine packing machine, a point-of-sale (POS) system, an electronic cash register (ECR), an automatic teller machine (ATM), a barcode printer Bar code printer).

The control unit 50 releases the braking of the print ribbon 40 at the print start position of the print paper and brakes again at the print end position and outputs the position of the print paper at the home position to the drive unit drive motor And one pulse is 0.125 mm.

In the case of the automatic medicine packing machine, the driving motor for conveying the printing paper uses a step motor which moves 0.9 ° when moving the step. Therefore, when one pulse is applied, the driving motor rotates by 0.9 °. Therefore, 400 pulses are required per rotation, 600 pulses, so that the heater roller 32 rotates by 1/2 when the motor for conveying the printing paper moves by one rotation.

That is, the heater roller 32 is divided into front and rear halves and print information is printed on the front and rear halves respectively. Therefore, when the heater roller 32 makes one rotation, the printing paper 31 is printed twice, The printing information is printed on the printing paper, that is, the paper.

The length of one bottle of the medicament to be packed in the automatic medicine packing machine is 75 mm, and the length of 75 mm is a length at which the heater roller 32 rotates by 1/2. The heater roller 32 transports one sheet of printing paper, 1/2 turn.

The Hall sensor may be configured to be sensed when one capsule is transported and may be attached by various configurations such as the side of the heater roller 32 or a roller configured to make one revolution separate, It is set to the standard position.

In the automatic medicine packing machine and the thermal transfer type printing machine using the thermal transfer head 38, when the printing ribbon 40 is pulled by the driving motor 36 at the time of printing, the force for pulling the printing ribbon 40 is constant and there is no minute vibration in the printing ribbon 40 The quality of the packaging and printing is affected if the pulling force changes according to the amount of the printing ribbon 40 wound on the sea-island roll 31 or when the driving motor 36 generates fine vibration.

Therefore, the present invention can adjust the torque applied to the print ribbon 40 by a predetermined force regardless of the amount of the print ribbon 40 in the automatic medicine packing machine and the thermal transfer type printing machine using the thermal transfer head 38 The present invention relates to a method of controlling a printing ribbon tension by using a motor in which the tension of the printing ribbon 40 becomes constant and the driving motor of the printing ribbon 40 and the driven motor do not generate fine vibration in the printing ribbon 40 by using the motor A motor torque value is given to the drive motor 35 and the driven motor 33 by the ratio of the rotation speed of the wind-up roll 39 and the sea-wound roll 31 on which the print ribbon 40 is wound, The braking force is converted from a small value to a large value in a stepwise manner in a manner that adjusts the tension of the print ribbon 40 to an optimum state at every step, and the braking force is applied to the drive motor 35 and the driven motor 33 Depending on the amount of current applied, The torque of the motor 35 and the follower motor 33 is constant.

A method of controlling a printing ribbon tension using a motor according to the present invention includes the steps of providing an initial torque (S 10), detecting a ribbon (S 20), detecting a pulse (S 30), converting a coefficient (S 40) Step S50 and motor torque application step S60.

The control unit 50 includes a pulse detecting unit 51, a tension adjusting unit 52 and a central processing unit (CPU) 53. The control unit 50 determines whether the print ribbon 40 has been replaced, And the follower pulse, converts the detected pulse into a count value, calculates a ratio of the count value, judges whether the count value is the same, and performs control such as giving a motor torque value to the drive motor and the driven motor .

In order to use the printing ribbon 40 in the automatic medicine packing machine or the thermal transfer type printing machine, the initial torque applying step S 10 must insert the new printing ribbon 40 into the follower portion of the sea- And giving an initial torque value to the display unit or the input device when the new print ribbon 40 is inserted.

The initial torque value is set in the tension regulating section 52 of the control section 50 regardless of the amount of the print ribbon 40. The initial torque value is transmitted to each of the drive motor 36 of the drive section and the driven motor 33 of the driven section, ) Of the torque converter.

The printed ribbon 40 is wound up to a predetermined length as a preliminary product so that the wound diameter of the printed ribbon 40 is normalized and the new printed ribbon 40 has a large diameter wound and the printed ribbon 40 is used The diameter of the printed ribbon 40 wound around the printed ribbon 40 is reduced so that the printed ribbon 40 is wound around the printed ribbon 40 so that the new printed ribbon 40 wound around the driven portion can be consumed. To the driven motor 33 of the driven portion and the drive motor 36 of the driven portion, respectively.

The drive motor 36 and the driven motor 33 are linearly proportional to the applied voltage and the output torque is linearly proportional to the input current and the output efficiency is good. By controlling the driving portion and the follower portion of the printing ribbon 40 to the automatic medicine packing machine or the thermal transfer type printing machine by using the characteristic that the printing ribbon 40 is linearly proportional to the printing ribbon 40, will be.

The initial torque value of the driving portion is slightly larger than the initial torque value of the driven portion, so that the printing ribbon 40 of the driven portion is wound around the driving portion while being wounded. For this purpose, (40) is set in advance by setting an initial torque value capable of operating in the entire region,

The display unit may include a Full Touch and a TFT Color LCD (Thin Film Transistor Color Liquid Crystal Display), and may be input in a one-touch manner.

The ribbon sensing step S 20 automatically detects whether the printing ribbon 40 is positioned on the follower axis of the marigold roll 31 when the power is turned on in the automatic medicine packing machine or the thermal transfer printing press, (S 10).

The ribbon sensing step S 20 may be performed when the new print ribbon 40 inserted in the follower portion of the sea rolls 31 is exhausted in the initial torque applying step S 10 or when the print ribbon 40 is cut It is necessary to remove the used printing ribbon 40 and insert the new printing ribbon 40 into the driven shaft of the sea roll 31. However, Is detected.

When the power is inputted from the medicine automatic packing machine or the thermal transfer type printing machine or the like, when the driving part of the sea rice roll 31, that is, the driving shaft, is automatically driven to such a degree that the printing ribbon 40 is slightly damaged, The drive unit is driven but the follower unit is not rotated. Therefore, it is detected whether the print ribbon 40 is present on the follower axis of the roll 31 according to the rotation of the follower unit.

If it is detected in the ribbon sensing step S 20 that there is no printing ribbon 40 on the slave axis of the sea roll 31, the display unit or the warning unit outputs an error and the user recognizes an error, And an initial torque input step (S21) for inputting an initial torque to the input device or the like, and inserting a new print ribbon (40).

If it is determined that the printing ribbon 40 is removed, exhausted or cut because the initial torque value is given to the automatic medicine packing machine or the thermal transfer type printing machine by the initial torque giving step S 10, An error is output from the display unit or the warning unit in the control unit 20 so that the user can replace the print ribbon 40 on the slave axis of the sea roll 31 with the new print ribbon 40, If there is no print ribbon 40 on the coaxial axis, a new print ribbon 40 is inserted.

When the new print ribbon 40 is inserted into the driven shaft of the sea-wound roll 31 in the ribbon sensing step S 20 and the initial torque value is inputted, the initial torque value of the initial torque giving step S 10 And the ribbon detection step S 20 is performed again.

A method of confirming whether the print ribbon 40 has been newly replaced can be performed by configuring a sensor on the driven shaft of the print ribbon 40 so that the sensor can check the presence or absence of a bobbin around which the print ribbon 40 is wound, When the print ribbon 40 is replaced, it can be confirmed by the signal inputted by the input key of the input unit.

In the ribbon sensing step S 20, if it is determined that there is the print ribbon 40 on the slave axis of the sea-wound roll 31, the pulse detection step S 30 is performed, In the state in which the initial torque value is inputted to the driven roller 33 and the driven motor 33 of the driven portion and the print ribbon 40 is provided on the driven shaft of the wound roll 31, And the pulse detecting section 51 for detecting the pulses of the driving section and the follower section uses a transmission type optical sensor or the like.

In the pulse detection step S30, it is possible to measure the driving part pulse and the follower part pulse based on a predetermined time, but in this case, since both the driving part pulse and the follower part pulse value are changed, It is preferable to use the driving pulse as a reference.

In the pulse detection step (S30), pulse detection is a method of measuring the pulse value of the driven part based on a certain value of the driving part pulse, that is, measuring the pulse of the driven part when the driving part pulse is 60 pulses.

In the pulse detection step S30, the pulse detecting unit 51 detects a pulse generated by the driving motor 36 of the driving unit and the driven motor 33 of the driven unit by the rotation of the printing ribbon 40, And the detected pulse is converted into a pulse signal and outputted.

In the pulse detecting step S30, the transmission type optical sensor of the pulse detecting unit 51 constitutes a plurality of slits on the rotating disk, and the light emitted from the light emitting unit is detected by the light receiving unit through the fixed slit, Signal pulse and constitutes the rotation axis of the driven motor 33 and the driven motor 36. [

The transmission type optical sensor can be configured as a rotary shaft such as a roll gear or an idle gear. However, considering the convenience of the pulse generation and the configuration, it is preferable that the transmission type optical sensor is formed on the rotary shaft of the drive motor 36 and the driven motor 33, The sensor may be changed to a magnetic type Hall sensor or the like.

The count value conversion step S40 is a step of converting the driving unit pulse and the follower unit pulse into coefficient values in the central processing unit 53 when a pulse is detected in the pulse detection step S30, The number of pulses converted by converting the number of follower pulses is used as the count value.

Assuming that the driven unit detects 60 pulses when the driving unit is 60 pulses in the pulse detection step (S30), if it detects 45 pulses in the driven unit, the count value of the driven unit in the count value conversion step (S40) (60/80) * 40 = 30 when the pulse of the driving unit detected in the pulse detection step (S30) is 80 and the pulse of the driven part detected is 40, and the count value of the follower unit is 30 do.

The count value ratio calculation step S50 is a step of calculating a ratio of a driving unit coefficient value and a follower coefficient value in the central processing unit 53 and calculating a relative value with respect to the driving unit pulse, Is a step of calculating the percentage of the follow-up coefficient value.

Assuming that the driving unit detected in the pulse detection step S30 detects 45 pulses when the driving unit is 60 pulses, the coefficient value ratio calculation step S50 is such that the driving unit coefficient value is 60 and the driven unit coefficient value is 45 (45/60) * 100 = 75%. When the pulse of the driving unit detected in the pulse detecting step S30 is 80 and the pulse of the driven part detected is 40 (60/80 ) * 40 = 30, and the coefficient of the follower is 30, which is calculated as a percentage (30/60) * 100 = 50%.

The pulse detected by the pulse detecting unit 51 always outputs a pulse of a constant size irrespective of the magnitude of the voltages of the driving motor 36 and the driven motor 33. The central processing unit 53 includes a pulse detecting unit 51, And the pulses are converted into coefficient values, and the ratios are calculated based on the converted coefficient values.

The motor torque application step S60 is performed by the tension controller 52 in accordance with the ratio of count values calculated in the count value ratio calculation step S50 to the drive motor 36 and the driven motor 33, The drive motor 36 and the driven motor 33 are controlled by the tension control unit 52 in accordance with the ratio of the counted values calculated as the step of giving the drive motor torque and the driven motor torque corresponding to the ratio do.

The drive motor 36 is imparted with the drive motor torque to rotate in the forward direction, that is, the direction in which the print ribbon 40 is wound by the set current applied in the motor torque application step S60, and the driven motor 33 is driven The motor torque is stopped and the tension of the print ribbon 40 is constantly adjusted.

In the motor torque application step S60, the drive motor 36 rotates in the forward direction with the drive motor torque in the forward direction according to the ratio of the drive part coefficient value and the follower part coefficient value of the print ribbon 40, A driving torque is slightly higher than that of the driven portion, that is, the driven portion + alpha is given to change the drive motor power and the driven motor power of the motor in accordance with the remaining amount of the print ribbon 40, Thereby appropriately adjusting the tension of the belt 40.

Is a torque which is smaller than a value obtained by converting the tensile strength of the print ribbon 40 into a torque and is larger than 0, and when the print ribbon 40 is driven,? Is smaller than a value obtained by converting the tensile strength of the print ribbon 40 into torque The print ribbon 40 is cut off and if the value is smaller than 0, the print ribbon 40 comes loose and the print ribbon 40 comes to the print paper, Is a torque which is not cut at the time of winding but does not come to the printing paper.

The torque applied to the driven motor 33 of the driven portion so that the print ribbon 40 is released in a taut state without being cut off is referred to as a driven motor torque.

When the values of the driving motor torque and the driven motor torque are equal to each other, that is, when the driving motor torque-driven motor torque is equal to 0, the printing ribbon 40 is in a tense state. When the value of the driving motor torque is smaller than the driven motor torque When the value of the drive motor torque is larger than the value of the driven motor torque, that is, when the drive motor torque-driven motor torque <0, the release of the print ribbon 40 is stopped and the braking state is established. > 0, the print ribbon 40 is in the released state.

The drive motor 36 and the driven motor 33 are arranged such that the torque is linearly proportional to the input current, that is, the torque-to-current (TI characteristic) is linearly linear and linearly inversely proportional to the number of revolutions Characteristics) are linearly inversely proportional to each other, the torque can be precisely controlled according to the amount of the input current.

Therefore, since the driving motor 36 and the driven motor 33 have two characteristics in which the torque and the rotation speed increase linearly in direct proportion as the current flowing through the motor increases, The drive motor 36 rotates in the forward direction by the drive motor torque and the driven motor 33 is stopped in the state where the driven motor torque is applied and the tension of the print ribbon 40 is relaxed Can be adjusted appropriately.

The tension adjusting device of the above-mentioned prior art No. 10-1206876 roll paper is a passive type braking device which generates power by turning off the power to the step motor, So that no superimposed printing occurs on the printing paper and the motor torque of the driving motor 36 and the driven motor 33 is accurate and rotation control is easy and printing There is an effect such that the ribbon 40 is held in a state in which the ribbon 40 is maintained at a constant tension.

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the appended claims.

10: main body bracket 20: movable plate
31: maritime roll 32: printing roller
33: Brake motor 34: Brake gear
35: Moving motor 36: Driving motor
37: drive gear 38: thermal transfer head
39: winding roll 40: printing ribbon
50: control unit 51: pulse detection unit
52: tension adjusting portion 53: central processing unit

Claims (3)

A tension regulating device for a printing ribbon using a thermal transfer printing system used in a medicine automatic packing machine or a thermal transfer type printing machine,
An initial torque imparting step of giving an initial torque value that can operate in the entire area of the print ribbon to each of the drive motor and the driven motor of the driven part when a new print ribbon is inserted into the follower part of the print ribbon;
A ribbon detecting step of detecting whether or not a printing ribbon is present in the driven part of the paper roll when the power is inputted to the automatic medicine packing machine or the thermal transfer type printing machine;
A pulse detecting step of detecting a pulse of a driving part and a follower part of the printing ribbon in the pulse detecting part when the ribbon is in the follower part of the sea-
A count value conversion step of converting a driving unit pulse and a follower pulse after the pulse detection of the driving unit and the follower unit into coefficient values;
Calculating a ratio of a driving unit coefficient to a follower coefficient when the coefficient is converted;
And a motor torque giving step for giving a drive motor torque and a driven motor torque corresponding to the ratio of the counted values to the drive motor and the driven motor in accordance with the ratio of the count value
Wherein a tension of the print ribbon is appropriately adjusted by changing the motor torque of the drive motor and the driven motor according to the remaining amount of the print ribbon.
The method according to claim 1,
And an initial torque input step of outputting an error and outputting an initial torque in the display unit or the warning unit when it is detected that there is no print ribbon on the driven shaft of the sea- Method of controlling ribbon tension.
3. The method of claim 2,
Wherein the motor torque application step is performed in such a manner that the drive motor rotates in a forward direction in accordance with the ratio of the driving unit coefficient value and the follower coefficient value of the print ribbon and the driven motor is stopped in a state in which the motor torque is applied, Wherein the printing ribbon tension control method comprises the steps of:

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