JPH02249675A - Serial printer - Google Patents

Abstract

PURPOSE:To reduce the number of processes for adjusting the tension of a belt when a printer is assembled thereby to reduce the cost by providing an arm unit in a rotatable manner which has an idler pulley rotatably mounted therewith and also providing a spring member in said arm unit to press said idler pulley against a driving belt while permitting rotation of said idler pulley. CONSTITUTION:When a printer is assembled, after all the parts are mounted, a driving belt 3 is stretched between a motor 2 and a driven pulley 4. Then, an arm unit 6 is pressed to the side of the driving belt 3 by a rotary spring 15A which is a spring member 7, so that an idler pulley 5 mounted at the front portion of the arm 13 is pressed against the driving belt 3, thereby giving a necessary tension to the driving belt 3. The tension of the driving belt 3 can be adjusted by the strength of the spring member 7. Thus, it becomes unnecessary to adjust the tension of the driving belt 3. At the same time, since a stay 10 is hung between frames 9A, 9B and the motor 2 and driven pulley 4 are mounted on this stay 10, the lateral stress working on the frames 9A, 9B can be remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial printer, and particularly to a carriage drive device.

[Conventional technology]

FIG. 7 shows a conventional example.

In the conventional example shown in FIG. 7, there is a print head 50 that prints on paper using an ink ribbon (not shown), a carriage 51 on which a print head 50 is mounted, and a carriage movement that moves this carriage 51. means 52. The carriage moving means 52 includes a carriage moving motor 53, a guide portion 54 that guides the carriage 51 to move while maintaining parallelism, and a motor 53.
The drive belt 55 is equipped with a drive belt 55 that moves the carriage 51 by the driving force of the drive belt 55, and a driven pulley 56 that rotatably supports the drive belt 55. The guide portion 54 has two guides 54A and 54B fixed to the frame 57 in parallel, and holds the carriage 51 slidably through a through hole provided in the carriage 51.

The carriage 51 has an annular 0M moving belt 55 which allows it to move while maintaining parallelism.
Part of it is fixed to the carriage 51, and the carriage 51 is moved by driving this drive belt 55 with a motor 53. In addition, this drive belt 5
5 is stretched across one side to a motor pulley 58 attached to the shaft of the motor 53 and the other side to a driven pulley 56. The motor boot 1J58 is fixed to the shaft of the motor 53, and either the motor 53 or the driven pulley 56 is fixed to the frame 57, but the other can be fixed after adjusting the tension of the drive belt 55. It is attached to the frame 57.

[Problem to be solved by the invention]

However, in the above-mentioned conventional example, the motor passing the drive belt and the drive boob must be fixed to the frame after adjusting the tension of the belt, which has the disadvantage of requiring time for adjustment when assembling the printer. there were. Further, if the tension of the belt changes during use, there is an inconvenience that the printer must be stopped and the tension of the belt must be readjusted.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a serial printer that can improve the disadvantages seen in the conventional example, reduce the number of man-hours for belt tension adjustment during printer assembly, and reduce costs.

[Means to solve the problem]

The present invention includes a print head that prints on paper using an ink ribbon, a carriage on which this print head is mounted, and a carriage moving means for moving this carriage, and the carriage moving means includes a carriage moving motor and a carriage. The carriage is equipped with a guide section that guides the carriage to move in parallel, a drive belt that moves the carriage by the driving force of the motor, and a driven pulley that rotatably supports the drive belt. An idler pulley is disposed between the motor and the driven pulley, and an arm to which the idler pulley is rotatably attached is rotatably provided to allow the idler pulley to rotate and press against the drive belt. A method is adopted in which a spring member is provided on the arm. This aims to achieve the above-mentioned objective.

[For production]

When assembling the printer, after all parts are attached, the drive belt is passed between the motor and the driven pulley. Here, both the motor and the driven pulley are already fixed to the frame, and the spring member is attached to the arm. By pressing against the drive belt, the idler pulley attached to the tip of the arm is pressed against the drive belt and the necessary tension is introduced into the drive belt. This tension adjustment is
The strength and attachment of the spring member can be adjusted depending on the position, etc.

When a printing operation is started, the motor is activated to drive the drive belt. The drive belt is always kept under constant tension by a spring member, and a portion of the drive belt is fixed to a carriage on which a print head and the like are mounted. Printing is performed by moving the print head by rotating this drive belt with a motor. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. Here, the same reference numerals are used for the same constituent members as in the conventional example described above.

The conventional example shown in FIG. 1 includes a print head 50 that prints on paper using an ink ribbon (not shown), a carriage 51 on which this print head 50 is mounted, and a carriage moving means for moving this carriage 51. 1, the carriage moving means 1 includes a carriage moving motor 2, a guide portion 54 that guides the carriage 51 to move in parallel, and a drive belt that moves the carriage 51 by the driving force of the motor 2. 3 and a driven pulley 4 that rotatably supports the drive belt 3. Here, an idler pulley 5 is disposed between the motor 2 and the driven pulley 4, and an arm 6 to which the idler pulley 5 is rotatably mounted is rotatably provided to drive the idler pulley 5. A spring member 7 that allows rotation of the belt 3 and presses it is provided on the arm portion 6.

This will be explained in further detail.

Since the details of the guide portion 54 have already been described, they will be omitted here. The drive belt 3 has an annular shape, and a part of the drive belt 3 is fixed to the carriage 51.
The carriage 51 is driven by the motor 2.
to move. After all parts are attached at the time of printer assembly, the drive belt 3 is stretched such that one end passes over a motor pulley 8 attached to the shaft of the motor 2, and the other end passes over a driven pulley 4. The motor pulley 8 is attached to the motor 2, and the motor 2 is further fixed to one end of a stay 10 that is fixed between the left and right frames 9A and 9B.

Further, the driven pulley 4 is fixed to the other end of the stay 10. As shown in FIGS. 2 to 5, an arm section 6 equipped with an idler pulley 5 at its tip and equipped with a spring member 7 is rotatably attached to the intermediate section of the stay 10. .

As shown in FIG. 5, the stay 10 has an arm portion 6.
A receiver 11 is provided as a center of rotation, and a cutout of a rotation stopper 12 is provided to limit the rotation range. In the arm portion 6, a rotary shaft 16 is attached near one end of the arm 13, and this is inserted into the receiver 11 described above to rotatably support the arm portion 6. Further, an idler pulley 5 that directly contacts the drive belt 3 is attached near the other end. Furthermore, a protruding claw 14 is provided in the middle portion of the arm 13 to be inserted into the notch of the rotation stopper 12 described above to limit the range of rotation of the arm portion 6 and to prevent it from falling out during rotation. It is being A rotation spring 15A serving as a spring member 7 is attached to the arm portion 6 so as to always rotate the arm portion 6 in one direction (direction A in the figure).

Next, the operation will be explained.

When assembling the printer, after all parts are attached, the drive belt 3 is passed between the motor 2 and the driven pulley 4. Here, both the motor 2 and the driven pulley 4 are already fixed to the stay 10, and the tension of the drive belt 3 is not adjusted. By pressing the idler boot 175 attached to the tip of the arm 13 against the drive belt 3, the necessary tension is introduced into the drive belt 3. The tension of the drive belt 3 can be adjusted by adjusting the strength of the spring member 7. In this way, the trouble of adjusting the tension of the drive belt 3 can be avoided, and at the same time, the motor 2 and the driven pulley 4 can be connected directly to the frame 9A.
, without fixing it to 9B, install the stay 1 between frames 9A and 9B.
0 and by attaching the motor 2 and driven pulley 4 to this stay 10, the lateral force acting on the frames 9A, 9B is significantly reduced, and the frames 9A, 9B can be made thinner.

When the printing operation is started, the motor 2 is activated to drive the drive belt 3. The drive belt 3 is always maintained at a constant tension by a spring member 7, and a portion of the drive belt 3 is fixed to a carriage 51 on which a print head 50 and the like are mounted. By rotating this drive belt 3 by the motor 2, the print head 50 is moved to perform printing.

[Second example] Next, a second embodiment will be described based on FIG.

In this second embodiment, instead of the rotary spring 15A as the spring member 7 that presses the idler pulley 5 mounted on the arm section 6 against the drive belt 3 in the first embodiment, a spring 15B is used to support the arm section 6. A rotational force is applied to press the idler pulley 5 against the drive belt 3.

The other configurations are the same as those of the first embodiment described above.

Even in this way, the above mentioned '! It can have the same effect as the first embodiment.

〔Effect of the invention〕

As explained above, in the present invention, an idler pulley is disposed between the motor on which the drive belt is stretched and the driven pulley, and the arm portion to which the idler pulley is rotatably attached is rotatably mounted. The arm is equipped with a spring member that allows the drive belt to rotate and presses the idler pulley. Therefore, it is possible to provide an unprecedentedly effective serial printer that can reduce the number of man-hours for belt tension adjustment during printer assembly and reduce the cost of the printer.

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a plan view showing details of the stay, Fig. 3 is a side view of the stay shown in Fig. 2, and Fig. 4 is a detail of the arm part. A perspective view representing the fifth
6 is a side view showing the stay of the second embodiment of the present invention, and FIG. 7 is a perspective view showing the conventional example.

1... Carriage moving means, 2... Motor, 3... Drive belt, 4... Driven pulley, 5. Old idler pulley, 6.・・・・・・
・Arm part, 7... Spring member, 50...
・Print head, 51... Carriage, 54...
...Guide department.

Claims (1)

[Claims] (1) A print head that prints on paper using an ink ribbon, a carriage on which the print head is mounted, and a carriage moving means for moving the carriage, the carriage moving means including a motor for moving the carriage, In the serial printer, the serial printer is equipped with a guide portion that guides the carriage to move in parallel, a drive belt that moves the carriage by the driving force of the motor, and a driven pulley that rotatably supports the drive belt. An idler pulley is disposed between the motor and the driven pulley, and an arm portion to which the idler pulley is rotatably attached is rotatably provided, and the idler pulley is pressed against the drive belt while allowing rotation. A serial printer characterized in that a spring member is provided on the arm portion.