JP4494007B2 - Printer - Google Patents

Description

  The present invention relates to a printer having a timing belt as a transmission member that is rotated and driven by a platen roller that conveys printing paper such as a label or a tag, and can reduce vibration and noise of a motor as a driving source and stabilize printing position accuracy. The present invention relates to a printer having a driving force transmission structure.

  FIG. 2 is a schematic explanatory diagram of a conventional printer. The printer 1 includes a supply unit 2, a printing unit 4, and a peeling unit 5. The supply unit 2 includes a supply shaft 6 that rotatably holds a roll-shaped label continuous body in which a label continuous body 23 (printing paper) around which a label 22 is temporarily attached to a belt-like mount 21 is wound. The printing unit 4 includes a thermal head 9 and a platen roller 10, and a continuous label body 23 is sandwiched and conveyed between the thermal head 9 and the platen roller 10, and an ink ribbon 17 (described later) is continuously labeled. The ink on the ink ribbon 17 is transferred to the label 22 by a heat generating action of a heat generating element (not shown) of the thermal head 9 and transferred onto the upper surface of the body 23 so that desired printing can be performed.

  The ink ribbon 17 is unwound from the ribbon supply shaft 15 and wound around the ribbon winding shaft 16 via the guide roller 18 and the thermal head 9. The peeling part 5 is arranged so that the peeling plate 11 is arranged and turns the belt-like mount 21 to peel off the label 22. The belt-like mount 21 from which the label 22 has been peeled is transferred by the drawing roller 12 and the driven roller 13. The paper is discharged outside the printer 1 along the guide plate 14. The supply shaft 6 and each roller are supported by a printer frame 20.

  FIG. 3 is a schematic explanatory view for explaining a conventional printer driving device. A timing belt 28 is stretched between a driving gear 24 and a platen roller pulley 26 provided on a motor shaft 19a of a pulse motor 19 as a driving source. ing.

  In such a conventional driving apparatus, the pulse motor 19 as a driving source is fastened to the printer frame 20 with screws, but vibration generated by driving the pulse motor 19 is transmitted to the printer frame 20 to generate noise. Since it occurs, a structure having a structure attached via a rubber damper 7a as a vibration isolating member 7 is known.

  However, since the timing belt 28 is stretched between the drive gear 24 and the platen roller pulley 26 provided on the motor shaft 19a of the pulse motor 19, the rubber damper 7a is distorted in the thickness direction by the tension, and the drive gear 24 is lost in parallelism with the platen roller pulley 26, the timing belt 28 is rubbed against the flange of the drive gear 24 and becomes a vibration source, and the timing belt is worn. On the other hand, when the tension on the tension of the timing belt 28 is weakened, the label continuous body 23 is printed by performing forward transfer and reverse transfer, thereby causing backlash and unstable printing position accuracy. A problem occurs.

Japanese Patent Laid-Open No. 10-042513

  The present invention has been made in view of the above problems, and reduces vibration and noise even when a pulse motor, which is a drive source, is attached to a printer frame via a vibration isolation member. Another object of the present invention is to provide a printer with stable printing position accuracy.

  In order to achieve the above object, an invention according to claim 1 is a printer having a printing unit in which a thermal head and a platen roller are arranged, and a drive source attached to the frame of the printer via a vibration isolation member. A timing belt for transmitting a driving force from the driving source to the platen roller, and an urging means for urging the driving source in a direction substantially opposite to the tension direction of the tensioned belt. The present invention provides a printer characterized by comprising:

  In the invention of claim 2, the biasing means uses a toothed pulley and a timing belt.

  Therefore, by energizing the motor shaft tilted by the stretched timing belt with the urging means in the parallel direction, the timing belt is tensioned to the proper tension, preventing the occurrence of backlash and printing. Positional accuracy is stabilized, and noise and vibration can be reduced.

  According to the present invention, the pulse motor is attached to the printer frame via the vibration isolating member, and the direction of the tension applied to the motor shaft by the timing belt stretched between the drive gear provided on the motor shaft and the platen roller pulley is defined. By providing a biasing means that biases the motor shaft in a substantially reverse direction, the drive gear and the platen roller pulley are kept parallel, noise due to vibration can be reduced, and printing position accuracy is stable. can do.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. However, the same parts as those in the prior art are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 is an explanatory view of a main part illustrating a printer driving device of the present invention. A frame 20 of a printer 35 is provided with a pulse motor 19, a platen roller 10, and a tension pulley 29 as an urging means 30. A timing belt 28 and a tension belt 31 are provided.

  As shown in FIG. 4, the pulse motor 19 is attached to the frame 20 of the printer via a vibration isolating member 7 in which the mounting plate 7b, the rubber damper 7a, and the mounting plate 7b are integrally formed. A drive gear 24 having a tooth profile is fitted, and the motor shaft 19a and the drive gear 24 are integrated as a rotational drive source. Similarly, a platen roller pulley 26 having a tooth shape is fitted to the platen roller shaft 10a, and the platen roller 10 and the platen roller pulley 26 are provided so as to be integrally rotatable.

  The tension pulley 29 is a substantially extended line connecting the motor shaft 19a and the platen roller shaft 10a, and is provided so that the position can be adjusted so that a predetermined tension is obtained in the direction opposite to the platen roller shaft 10a with respect to the motor shaft 19a. ing.

  The timing belt 28 is provided so as to be stretched between the drive gear 24 and the platen roller pulley 26 described above. Further, the tension belt 31 is provided so as to be stretched between a drive gear 24 and a tension pulley 29 that has a tooth shape and is rotatable.

  The platen roller pulley 26, the drive gear 24, and the tension pulley 29 are arranged in a substantially straight line, and the pulse motor 19 and the tension pulley 29 can be mounted and fixed so that their positions can be adjusted on the substantially straight line.

Motor biases the proper tension to the timing belt 28 is fixed to Pa Rusumota 19 to frame 20, a rubber damper 7a of the vibration-proof member 7 at this time from being distorted external force is applied, the driving gear 24 is Toritsui The shaft 19 a is inclined in the direction of the platen roller pulley 26. By fixing the tension pulley 29 at a desired position in order to correct this inclination, the inclination of the motor shaft 19a can be corrected via the tension belt 31.

  As described above, according to the present embodiment, since the motor shaft 19a can be kept horizontal, the parallelism between the drive gear 24 and the platen roller pulley 26 can be secured, and the timing belt 28 is also biased with appropriate tension. It becomes possible to do.

  Since the parallelism between the drive gear 24 and the platen roller pulley 26 can be ensured, the timing belt 28 does not rub against the flange of the drive gear 24, and noise and wear of the timing belt 28 can be prevented. Since the appropriate tension can be applied to the belt 28, the occurrence of backlash can be suppressed and the printing position accuracy can be stabilized.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, and the like that are suitable for implementing the present invention.

It is a schematic explanatory drawing explaining the drive device of the printer of the present invention. It is a schematic explanatory drawing demonstrated from the paper set surface side of the printer. It is the schematic explanatory drawing explaining the drive device of the conventional printer. It is the schematic explanatory drawing demonstrated from the side surface of the vibration isolator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 7 ... Vibration isolating member, 7a ... Rubber damper, 7b ... Mounting plate, 10 ... Platen roller, 10a ... Platen roller shaft, 19 ... Pulse motor (drive source), 19a ... Motor shaft, 20 ... Frame, 24 ... Drive gear, 26 ... Platen roller pulley, 28 ... Timing belt, 29 ... Tension pulley, 30 ... Biasing means, 31 ... Tension belt (timing belt), 35 ... Printer

Claims (2)

In a printer equipped with a printing unit in which a thermal head and a platen roller are arranged,
A drive source attached to the frame of the printer via an anti-vibration member;
A motor shaft to which the driving force from the driving source is transmitted;
A drive gear fitted to the motor shaft;
A timing belt stretched between the platen roller and the drive gear;
A tension pulley provided in a direction opposite to the tension belt,
A tension belt stretched between the tension pulley and the drive gear;
With
A printer characterized in that the tension applied to the motor shaft by the timing belt is equal to the tension applied to the motor shaft by the tension bell. 2. The printer according to claim 1, wherein the urging means uses a toothed pulley and a timing belt.

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