KR100734879B1 - Printer - Google Patents

Abstract

An object of the present invention is to efficiently dissipate and dissipate heat generated by a carriage feed motor and a paper feed motor generated by continuous operation of a printer.

The carriage conveying motor 10 and the paper conveying motor 40 are arranged separately on the left and right sides of the frame 3 supporting the printing unit, and the cylinders of the motors 10 and 40 are arranged to be in contact with the frame 3. In addition, the paper pressing plate 5 is supported by the boss portion 10b of each motor. The heat source (motors 10 and 40) are separated by this configuration and the frame 3 and the paper pressing plate 5 function as heat sinks, so that the heat radiation effect can be enhanced.

Description

Printer {PRINTER}

1 is a perspective view showing a schematic configuration of a printer of this embodiment.

2 is a diagram for explaining printing and paper feeding of the printer.

3 is a view for explaining the power transmission of the printer.

4 is a view for explaining the mounting of the paper pressing plate of the printer.

5 is a view for explaining the paper transfer power transfer of the printing device.

(Explanation of the sign)

3 ----- sideframe 4 ----- platen

5 ----- Paper Press Plate 7 ----- Stamp

9 ----- Guide rail 10 ----- carriage transfer motor

11 ----- carriage feed motor gear 12 ----- camshaft gear

20 ----- factor head 21 ----- carriage

23 ----- camshaft 24 ----- photodetector

40 ---- Paper Feed Motor 41 ----- Paper Feed Motor Gear

42 ----- Reduction Gear 43 ----- Paper Feed Shaft

44 ----- Paper Feed Gear 45 ----- Paper Feed Roller

46 ----- Paper Press Roller 47 ----- Paper Press Spring

50 ----- Ink Ribbon 51 ----- Switching Lever

52 ----- Ribbon Drive Gear 53 ----- Ribbon Drive Gear

54 ----- Ribbon winding gear

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, and more particularly, to a serial printer which prints by driving a carriage transfer mechanism and a recording sheet transfer mechanism by different step motors.

Background Art Conventionally, in a printer in which carriage transfer or recording sheet transfer is performed using a step motor, heat generation of the step motor becomes a problem when the printer is continuously operated. To avoid this problem, countermeasures such as lowering the drive current value of the step motor or limiting the continuous operation time of the printer have been prepared.

However, in the conventional method of lowering the drive current value of the step motor, a so-called step motor outage phenomenon may occur, in which sufficient motor torque is not obtained and the rotation of the motor cannot follow the drive pulse, and the continuous operation of the printer may occur. In the conventional method of limiting time, there is a problem in that the operation of the printer becomes an intermittent operation and the actual printing speed (throughput) decreases.

An object of the present invention is to provide a printer capable of continuously operating while insisting on the above-mentioned conventional problems and securing sufficient motor torque to solve the problem.

The printer of the present invention for achieving the above object is a frame supporting a printing unit for printing on a recording paper, holding a first and second face plates facing each other, and supported on the first and second face plates of the frame. A carriage transportable along the guide shaft with a guide shaft, a print head, a carriage feed motor for moving the carriage, a paper feed roller rotatably supported on the first and second face plates of the frame, In the printer having a paper feed motor for rotating the paper feed roller, the carriage feed motor is disposed in contact with the first face plate of the frame, the paper feed motor is disposed in contact with the second face plate of the frame It is done.

In addition, the carriage feed motor and the paper feed motor each have a cylindrical cylinder, the cylinder is composed of the first and second surfaces substantially perpendicular to the rotation axis of the motor, and the pillar surface connecting the first and second surfaces, the carriage Preferably, the transfer motor is disposed in contact with the first surface of the carriage transfer motor on the first face plate of the frame, and the paper transfer motor is disposed in contact with the first face of the paper transfer motor on the second face plate of the frame. As a result, the contact area between the frame and the motor can be increased, and the heat dissipation effect can be enhanced.

In this case, the rotation axis of the guide shaft and the paper feed roller are arranged in parallel with each other, and the carriage feed motor and the paper feed motor are arranged in the frame such that each rotation axis is substantially parallel to the rotation axis of the guide axis and the paper feed roller. It is preferable.

Further, the carriage feed motor and the paper feed motor are preferably arranged in the frame such that their respective rotation axes are located on the same line. In addition, it is preferable that the cylinder of the carriage feed motor and the cylinder of the paper feed motor have the same shape, and the carriage feed motor and the paper feed motor are arranged in face symmetry. Thereby, the shape of the 1st surface plate and the 2nd surface plate of a frame can be made substantially the same, and the development cost including design cost, mold cost, etc. can be reduced.

In addition, the carriage feed motor and the paper feed motor are arranged on the side where the first and second face plates face each other, and a paper guide plate for regulating the recording paper is provided between the second face of the carriage feed motor and the second face of the paper feed motor. It is preferable that it is done.

The present invention furthermore retains a platen supported on the first and second face plates of the frame and opposite the print head, wherein the paper guide plate is pressed from the print head side to the platen side. The paper guide plate may be configured to be pressed to the platen side by the elastic force of the paper guide plate. As a result, the paper guide plate and the platen come into contact with each other to further enhance the heat dissipation effect.

The frame may be composed of a substantially c-shaped frame having a first face plate, a second face plate, and a third face plate connecting the first face plate and the second face plate.

In addition, the first and second face plates of the frame are supported in parallel with the guide shaft while being driven by the carriage transfer motor to have a cam shaft for moving the carriage, and the carriage transfer motor is mounted on the frame such that its rotation axis is positioned parallel to the cam shaft. Preferably, the paper feed motor is disposed in the frame such that its rotation axis is located parallel to the rotation axis of the paper feed roller.

In addition, the carriage feed motor and the paper feed motor are preferably arranged in the frame such that each rotation axis is located between the cam axis and the rotation axis of the paper feed roller.

In addition, the printer of the present invention is an impact printer for printing recording paper via an ink ribbon, and a ribbon winding mechanism for winding ink ribbon on a side opposite to the carriage transfer motor with a camshaft interposed therebetween, and the ribbon winding mechanism It is preferably driven by a carriage feed motor.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the printer which concerns on this invention is described in detail with reference to drawings. 1 is a perspective view showing a schematic configuration of a printer of this embodiment. 2 is a diagram for explaining printing and paper feeding of the printer. 3 is a view for explaining the power transmission of the printer. 4 is a view for explaining the mounting of the paper pressing plate of the printer. 5 is a view for explaining the paper feed power transmission of the printing device.

First, the carriage drive mechanism and its operation will be described with reference to FIGS. As shown in Fig. 1, in the printer of the present embodiment, the carriage 21 on which the print head 20 is mounted is conveyed by the guide shaft 22 and the guide rail 9 by the printing paper 7 (arrow E direction). It is supported so as to reciprocate in the direction (arrow C direction) which is substantially perpendicular to ().

2, the carriage pin 21b protrudes below the carriage 21, and is couple | bonded with the spiral groove 23a formed in the camshaft 23 (lead screw system). At one end of the camshaft 23, a camshaft gear 12, which is a driven gear, is fixedly attached, and meshes with a motor gear 11, which is a drive gear fixedly attached to the rotation shaft 10a of the carriage transfer motor 10. (See Figure 3).

As shown in Fig. 3, when the carriage transfer motor 10 is excited and the motor gear 11 is rotated in the direction of arrow A, the cam shaft gear 12 rotates in the direction of arrow B, whereby the cam shaft The carriage 21 engaged with 23 moves in the direction of arrow C (return). Similarly, when the motor gear 11 is rotated in the direction opposite to the arrow A, the carriage 21 moves in the direction opposite to the arrow C (back).

A shielding plate 21a is provided below the carriage 21, and the shielding plate 21a is attached to the photodetector 24 provided at the end portion on the right side from the printing head 20 toward the printing paper 7. By detecting by this, presence or absence of the carriage 21 can be detected. In the present embodiment, the photodetector 24 is a transmission type optical sensor in which the light emitting portion and the light receiving portion are disposed to face each other. When the shielding plate 21a is positioned between the light emitting portion and the light receiving portion, the photodetector 24 has a high level. The circuit is configured to output the signal of.

The position of the carriage 21 on which the print head 20 is mounted is based on the predetermined position (hereinafter referred to as home position) set based on the output signal from the photodetector 24, and the carriage transfer motor 10 is used. Can be obtained by counting the number of driving pulses of For example, in a carriage return movement, after the high level signal is output from the photodetector 24, the position which moved 10 step again is determined as a home position.

The printer of this embodiment is an impact printer, and as shown in Fig. 2, when the printing head 20 is energized, the head pin (not shown) moves in the direction of arrow F, and the printing paper 7 is carried out through the ink ribbon 50. The printing is achieved by bringing the close contact with the platen 4. Then, while passing the carriage 21 in the arrow C direction from the home position (backward), the printing of one pass (for example, one row) is performed by energizing the factor head 20 at a predetermined timing. In the same way, printing is performed in the same way, and the carriage 21 is returned to the home position.

Next, the paper transfer mechanism will be described. As shown in Fig. 1 or 4, the carriage feed motor 10 and the paper feed motor 40 are disposed at both left and right ends of the paper path of the printing paper 7, and side frames 3a and 3b respectively formed of a metal sheet material. It is fixed at. Thus, in this example, the carriage feed motor 10 and the paper feed motor 40 are step motors of the same shape. Moreover, by arrange | positioning each motor to the left and right, it becomes possible to make side frame 3a, 3b substantially the same shape, and actually, in some products, it was possible to make the external shape the same and to make only some hole diameters different. Moreover, the side frames 3a and 3b support components, such as the guide rail 9 and the platen 4, as shown in FIG. 1, These components are fixedly attached to the frames 3a and 3b with screws.

The outer periphery of the carriage transfer motor 10 and the paper transfer motor 40, the side portion on which the motor gear 41 is mounted, and the cylindrical boss portion protruding from the rear side portion and the rear side portion opposite to the side portion are each made of metal. It is. This boss portion is also a bearing portion of the rotating shaft of the motor. As shown in FIG. 2, the supported portion 5a of the paper pressing plate (paper guide plate) 5 is rotatably supported by the boss portion 10b of the carriage transfer motor 10. By the same structure, the boss | hub part of the paper feed motor 40 rotatably supports another supported part (not shown) provided in the opposite end part of the to-be-supported part 5a. The paper pressing plate 5 is pressed against the platen 4 in the direction of arrow F by a spring (not shown) hung on the engaging portion 5b to press the printing paper 7 against the platen 4.

As shown in FIG. 5, the power of the paper feed motor 40 is a reduction gear that meshes with the paper feed motor gear 41 from the paper feed motor gear 41 fixedly attached to the rotating shaft of the paper feed motor 40. 42) is engaged with the reduction gear 42 and is transmitted to the paper transfer gear 44 fixedly attached to one end of the paper transfer shaft 43. As shown in Fig. 2, the paper feed roller 45 is fixedly attached to the center of the paper feed shaft 43, and is subjected to a constant pressing force by the elastic force of the paper press spring 47 that pushes the paper push roller 46. . The printing paper 7 inserted from the paper insertion hole is guided to the contact portion of the paper pressing roller 46 and the paper feed roller 45 along the predetermined paper path, and when the paper feed roller 45 is rotated in the direction of the arrow D, the paper The friction force generated between the pressing roller 46 and the paper feed roller 45 is conveyed in the arrow E direction. The paper feed amount can be arbitrarily adjusted by varying the drive step number of the paper feed motor 40 which is the step motor. Paper feeding during printing processing is performed after the printing of one pass (one direction) is finished and the carriage 21 is stopped, before the next printing is started.

Next, the winding mechanism of the ink ribbon will be described. An ink ribbon cassette (not shown) is disposed on the guide rail 9. The power for transferring the ink ribbon 50 is obtained by the sun gear 12a provided in the camshaft gear 12, as shown in FIG. The camshaft gear 12 is supported by the cam lever 23 with a switching lever 51 that swings between G and H, and a ribbon transmission gear 52, which is a planetary gear, is provided on the shaft portion provided at the tip of the cam lever 23. ) Is axially supported and meshes with the sun gear 12a. The ribbon transfer gear 52 is engaged with the spur gear 53a of the ribbon drive gear 53 only when the cam shaft 23 rotates in the direction of the arrow B, and the switching lever 51 is stabilized at the H position according to this rotation. The ribbon drive gear 53 is rotated in the arrow I direction. Then, the ink ribbon 50 is sent by rotating the ribbon winding gear 54 having the worm gear 54a in the direction of the arrow J through the worm 53b provided at the tip of the ribbon driving gear 53. On the other hand, when the cam shaft 23 rotates in the opposite direction to the arrow B, the switching lever 51 is stabilized at the G position, so that the engagement between the ribbon transfer gear 52 and the ribbon drive gear 53 is released, and the ribbon winding gear Since the power transmission to 54 is cut off, the ink ribbon 50 is not sent. That is, the ink ribbon 50 is wound only when the carriage 21 moves in the direction of arrow C. When the carriage 21 moves in the opposite direction to the arrow C, the ink ribbon 50 is not wound.

Here, the carriage transfer motor 10 and the paper transfer motor 40 generate heat during the continuous operation of the printer which continuously performs the above-described printing process and paper transfer process, and thus it is necessary to dissipate heat efficiently. . According to the present invention, the motors serving as the heat sources are arranged separately from the left and right sides of the printer, and the components having heat dissipation effect in contact with each motor, that is, the side frame 3 and the paper press plate 5 are disposed, and are generated from each motor. By dissipating heat and increasing the heat dissipation area, it is possible to efficiently dissipate and dissipate heat generated from each motor.

As mentioned above, although one Embodiment of this invention was described based on drawing, this invention is not limited to what was shown in the said embodiment, Based on the claim, description of detailed description of invention, and well-known technique, those skilled in the art The range including the change, application is included.

For example, although the carriage feed motor 10 and the paper feed motor 40 were arrange | positioned inside the side frame 3 (factor unit side), respectively, you may comprise so that it may be arrange | positioned outside.

Although the side frames 3a and 3b are not separate bodies, the first face plate corresponding to the side frame 3a and the second face plate corresponding to the side frame 3b, and the first and second face plates connecting the first and second face plates. An approximately C-shaped integral frame having a three-sided plate may be used.

It is to be noted that the paper pressing plate 5 is pushed by the platen 4 not by a spring, but may be an elastic member such as rubber, or the paper pressing plate 5 itself may be elastic.

As described above, according to the present invention, since the heat generated from the carriage transfer motor and the paper transfer motor can be efficiently generated, the printer can be continuously operated without lowering the drive current value of each motor. The fall of speed (throughput) can be prevented.

In addition, by using the paper pressing plate as a simple supporting structure using the bosses of the respective motors, the number of parts can be reduced, and further, a cost reduction effect can be obtained.

Claims (12)

A frame which holds the printing unit for printing on the recording paper and holds the first and second face plates facing each other; Guide shafts supported by the first and second face plates of the frame; A carriage movable along the guide shaft by mounting a print head; A carriage transfer motor for moving the carriage, A paper feed roller rotatably supported by the first and second face plates of the frame and for sending the recording paper; In the printer having a paper feed motor for rotating the paper feed roller, The carriage transfer motor is disposed in contact with the first face plate of the frame, The paper feed motor is disposed in contact with the second face plate of the frame. According to claim 1, wherein the carriage feed motor and the paper feed motor each has a cylindrical cylinder, The cylinder is composed of first and second surfaces perpendicular to the rotation axis of the motor, and columnar surfaces connecting the first and second surfaces. The carriage transfer motor is disposed in contact with the first surface of the carriage transfer motor to the first face plate of the frame, And the paper feed motor is disposed in contact with the first surface of the paper feed motor on the second face plate of the frame. The rotating shaft of the guide shaft and the paper feed roller are disposed in parallel with each other, And the carriage feed motor and the paper feed motor are disposed in the frame such that their respective rotation axes are located parallel to the guide shaft and the rotation axis of the paper feed roller. The printer according to claim 1 or 2, wherein the carriage transfer motor and the paper transfer motor are arranged in the frame such that their respective rotation axes are on the same line. The printer according to claim 1, wherein the cylinder of the carriage transfer motor and the cylinder of the paper transfer motor have the same shape, and the carriage transfer motor and the paper transfer motor are arranged in plane symmetry. . According to claim 2, wherein the carriage feed motor and the paper feed motor is disposed on the side opposite the first and second face plate, And a paper guide plate for regulating the recording paper between the second side of the carriage transfer motor and the second side of the paper transfer motor. The apparatus of claim 6, further comprising a platen supported on the first and second faceplates of the frame and opposite the printhead, And the paper guide plate is pressed from the print head side to the platen side. 8. A printer according to claim 7, wherein the paper guide plate is pushed against the platen by the elastic force of the paper guide plate. The frame according to claim 1 or 2, wherein the frame is a c-shaped frame having the first face plate, the second face plate, and a third face plate connecting the first face plate and the second face plate. Printer. delete delete delete

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