JPS61123564A - Power source device in printer - Google Patents

Abstract

PURPOSE:To enable a printer to be used by only replacing a unit casing when a supply voltage is changed due to the change of use place of the printer, by a construction wherein a voltage-adjusting unit casing is detachably provided at a part of a main body casing of a printer, and a disconnectable connector is provided between the main body casing and the unit casing. CONSTITUTION:A part of the main body casing 1 of the printer is partitionedly separated, and the unit casing 30 apparently integral with the casing 1 is detachably provided at the part. A power source unit 26 comprising a high- voltage input part 36, a transformer 37 for converting a high voltage into a low voltage and a low-voltage output part for outputting a low-voltage power fed from the transformer 37, is enclosed in the unit casing 30. A fitting part 26 of the main body casing 1 and the low-voltage output part in the unit casing 30 are connected to each other through the disconnectable connector 44.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Application Field) This invention provides a platen, a print head facing the platen, and a drive mechanism for driving paper feed and movement of the print head. and a low voltage input section for inputting low voltage power to the drive mechanism, and the print head moves along the longitudinal direction of the platen based on the drive by the drive mechanism and prints on the print paper on the platen. Regarding a printer that allows paper feeding to be performed at the same time as
In particular, it relates to the power supply device.

(Prior Art and Problems to be Solved by the Invention) In a conventional printer, a power supply unit is provided in the case, and after converting high voltage power from an external power supply into low voltage, We are trying to provide human resources to the mechanism. Therefore, when using conventional printers in areas with different voltages, it is necessary to replace transformers and rewire them within a narrow case, which is a tedious task.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention includes a high voltage input section into which high voltage power from an external power source is input, and a high voltage input section for inputting the high voltage power. a transformer to convert to low voltage;
A power supply unit equipped with a low voltage output section from which low voltage power is output from the transformer is removably attached to a mounting section provided in a part of the case. A configuration is adopted in which the voltage output section is connected via a detachable connector.

(Function) Therefore, the power supply unit of the printer can be easily replaced with another power supply unit 7) equipped with a transformer with a different voltage conversion rate. Furthermore, by preparing a large number of power supply units equipped with transformers of various voltage conversion ratios, it is possible to easily adapt to specifications in regions with different voltages.

(Example) An example embodying the present invention will be described below with reference to the drawings. As shown in Fig. 2, the main body case 1 of this printer is formed of synthetic resin material into a box shape with a bottom.
A substantially box-shaped frame 2 with a bottom, also made of synthetic resin material, is fixed to the rear side by a plurality of screws 3 and the like. At the rear of the frame 2 is a platen 4 extending in the left and right direction.
is rotatably supported. As shown in FIG. 4, a support member 5 is attached to the lower right side of the frame 2,
A drive motor 7 for driving the platen is mounted on the rear standing portion 6. A plurality of gears 9 to 1 are connected between the drive motor 7 and the driven gear 8 fixed to the right end of the platen 4.
A gear transmission mechanism consisting of the drive motor 7 is provided.
The rotational motion of the platen 4 is transmitted to the platen 4 via this gear transmission mechanism and the driven gear 8.

A guide rod 12 extending in the longitudinal direction of the platen 4 is installed on the frame 2 at the lower front of the platen 4, and a carriage 14 on which a print head 13 is mounted is supported on the guide rod 12 so as to be movable left and right.

A guide piece 15 is provided protruding from the front end of the carriage 14, and the guide piece 15 engages with the upper surface of a guide portion 16 formed on the frame 2 and extending from side to side. Further, a roller 17 that contacts the printing paper on the platen 4 is rotatably supported on the carriage 14 .

A large-diameter toothed driving pulley 18 is rotatably supported by the support member 5 near the right end of the guide rod 12, and a frame 2 is rotatably supported near the left end of the guide rod 12.
A toothed driven pulley (not shown) is rotatably supported on the top, and a toothed belt 19 is hung between these pulleys.

A portion of this belt 19 is fixed to the carriage 14.

A ribbon cassette 21 having an endless ink ribbon 20 is detachably attached to the frame 2 in front of the platen 4. Also, a part of the ribbon 20 is exposed in a stretched manner across the entire width of the print area between the guide parts at both the left and right ends of the ribbon cassette 21, and the exposed ribbon part is connected between the print head 13 and the platen 4. placed in between.

During the printing operation, as the drive motor rotates,
The carriage 14 and print head 13 are reciprocated from side to side via each pulley and belt 19, and the gutter 13 for printing is operated. Further, as the carriage 14 reciprocates, the printed ribbon 20 passes through the right guide section and is collected into the cassette 21, and the unused ribbon 20 is pulled out from the cassette 21.
Printing is performed on the printing paper on the platen 4 in cooperation with the printing head 13 and the printing head 13 . Further, each time a printing operation is performed, the platen drive motor 7 is driven to rotate, and the platen 4 is rotated via each of the gears 8 to 11, thereby feeding the printing paper.

Note that the platen 4. Carriage 14. Print throat 1
3, the ribbon cassette 21, and the like constitute a drive mechanism.

As shown in FIG. 2.5, a printed circuit board 22 is disposed at the bottom of the case 1, on which a central processing unit, a character generator, etc. constituting a control section are mounted. Further, as shown in FIG. 1.3.5, a cover 23 that covers the upper front part of the printed circuit board 22 is removably attached to the side wall of the case 2, and the cover 23 is attached to the control section. Various operation switches 24 are provided for inputting predetermined signals. Further, a protrusion 23a that can be engaged with and disengaged from the engagement recess 1a formed on the left side wall of the main body case 1 is formed on the left lower surface of the cover 23, and a pair of front and rear connecting recesses 23b are formed on the right end surface of the cover 23. is formed.

As shown in FIGS. 2 and 3, a mounting recess 25 is cut out in the right front part of the case 1, and a power supply unit 26 is mounted in the recess 25 for supplying power to the control section.
is removably attached. Therefore, this power supply unit 26 and its related structure will be explained in detail.

As shown in FIG. 2.4, the four mountings are formed in grooves 2 on the periphery of the recess 25, extending vertically and opening at the upper end.
7 are formed at predetermined intervals, and a recess 28 and a boss 29 are provided for the attachment and the attachment, respectively, each having a through hole.

The unit case 30 of the power supply unit 26 is composed of a bottomed box-shaped lower case 31 and a cover 32 that is bonded and fixed to the upper end surface of the opening peripheral wall of the lower case 31.

On the outer surface of the peripheral wall of the lower case 31, there are four connecting protrusions 33 that are inserted into the grooves 27 from above in a removable manner as shown in FIG. The mounting piece 34 is integrally formed to be inserted and arranged. Each connecting protrusion 33 is attached to a groove 27.
The mounting piece 34 is inserted into the recess 28.
The lower case 31 is attached to the main body by a screw 35 screwed into the piece 34 and the bottom surface of the lower case 31. It is fixed to case 1.

As shown in FIG. 1, inside the lower case 31 there is a three-terminal connector 36 for connecting a power cord, and a transformer 37.
& capacitor 38 are housed therein. Also,
A switch 39 is mounted on the inside of the cover 32, and its operating portion passes through the through hole 32a of the cover 32 and projects from the top surface thereof. The switch 39 is connected via a lead wire 40 between a predetermined connection terminal 36a of the connector 36 and one of a pair of terminals at the high voltage power input end of the transformer 37. In addition, the transformer 3
The other terminal of the high voltage power input terminal 7 is connected to the connection terminal 36b of the connector 36 by a lead wire 41.

Further, the ends of lead wires 42 and 43 extending from the low voltage power output side connection terminal of the transformer 37 and the capacitor 38 are connected to a female connector 44.
4 is removably fitted into a female connector (not shown) on the printed circuit board 22 constituting the low voltage input section of the control section, and based on this fitting, the power supply unit 26 is electrically connected to the printed circuit board 22. Connected. Therefore, when the switch 39 is opened in the connected state of the power supply unit 26, high voltage power from the external power source is transmitted to the transformer 37 via the power cord (not shown), the 3-terminal connector 36, and the lead wire 40. The high voltage input is input to the transformer 37, where the high voltage power is converted to a low voltage. Then, low voltage power is supplied from the low voltage output section of the transformer 37 to the printed circuit board 22 of the control section through the fitting between the female connector 44 and the female connector. The control section is configured to supply low voltage power to the drive mechanism in order to perform the above-described printing operation.

Note that the three-terminal connector 36. Transformer 37° lower case 31. A power supply unit 26 is configured by the cover 32 and the like.

On the other hand, a pair of connecting protrusions 46 are formed on the left end surface of the cover 32 of the power supply unit 26 and can be removably fitted into a pair of connecting recesses 23b formed on the right end surface of the cover 23 for the main body case 1. When the cover 23 is attached to the main body case 1 while the power supply unit 26 is attached to the main body case l, the coupling protrusion 46 is fitted into the coupling recess 23b, and the cover 23 is coupled to the power supply unit 26. .

Next, the assembly of the power supply unit 26 configured as described above will be explained. First, each lead wire 41 to 43 is connected to the 3-terminal connector 36. The transformer 37, the capacitor 38 and the female connector 44 are connected to each other, and the female connector 44
The other items are housed in predetermined positions in the lower case 31 of the unit case 30. Thereafter, the switch 39 that has been attached to the cover 32 in advance is connected to the three-terminal connector 36 and the transformer 37 through the lead vA40, and the cover 32 is
The assembly of the power supply unit 26 is completed by joining and fixing it to the lower case 31.

Subsequently, each connecting protrusion 4 of the lower case 31 shown in FIG.
6 is inserted into the groove 27 of the main body case 1 from above, and the mounting piece 34 is disposed within the recess 28. In this state, the unit case 30 is assembled to the main body case 1 by tightening the pair of screws 35. Then, the female connector 44 is connected to the printed circuit board 2.
2, the assembly of the power supply unit 26 can be easily completed in a short time.

After that, the connecting protrusion 46 of the cover 31 of the unit case 30 is connected to the connecting recess 23b of the cover 23 for the main body case 1.
The assembly of the cover 23 is completed when the protrusion 23a is engaged with the engagement recess 1a of the main body case 1. In this assembled state, the cover 23.degree. unit case 30 and main body case 1 have an integrated appearance as shown in FIG.

Further, in this embodiment, the unit case 30 can be easily removed from the main case 1 by pressing the unit case 30 from below after unfitting the connector and loosening the pair of screws 35. This makes it possible to easily replace each built-in component.

Furthermore, if the printer of this embodiment is to be used in areas where external power supply voltages differ, it is necessary to prepare a number of power supply units with pre-assembled transformers with a constant voltage on the low voltage output side and different voltage conversion ratios. By replacing the power supply unit according to the area of use, it can be used in a wide range of areas where external power supply voltages differ. In addition, in this embodiment, the power supply unit 26, which heats up as the printer is used, is partitioned by the side wall of the unit case 30, so the heat is not transmitted to the drive mechanism or the like.

Furthermore, in this embodiment, only low-voltage power is input to the printer, so the structure to meet electrical standards is simple and can be manufactured at low cost.

Effects of the Invention As detailed above, the present invention allows easy replacement of power supply units and assembly of power supply units with various specifications, and easily adapts to specifications in regions with different voltages. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a partially exploded perspective view showing the power supply unit etc. of a printer embodying the present invention, Fig. 2 is an exploded perspective view showing the main body case and frame, Fig. 3 is a perspective view of the printer, and Fig. 4
The figure is a plan view of the main part, and FIG. 5 is a sectional view of the main part. In the figure, 1 is a main body case, 4 is a platen, 13 is a print head, 26 is a power supply unit, 30 is a unit case, 36 is a three-terminal connector as a high voltage input section, 37 is a transformer, and 39 is a switch.

Claims (1)

[Claims] 1. Inside the case (1), there is a platen (4), a print head (13) facing the platen (4), and a device for driving paper feed and movement of the print head (13). and a low voltage input section for inputting low voltage power to the drive mechanism, and the print head (13) moves along the longitudinal direction of the platen (4) based on the drive by the drive mechanism. In a printer that prints on printing paper on a platen (4) and feeds the paper, the printer has a high voltage input section (36) into which high voltage power is input from an external power supply, and a high voltage input section (36) that receives high voltage power from an external power source. A power supply unit (equipped with a transformer (37) for converting voltage power into low voltage, and a low voltage output section from which the low voltage power from the transformer (37) is output)
26) is removably attached to the attachment part (25) provided in a part of the case (1), and the connector (44) is detachable from the low voltage input part and the low voltage output part.
). 2. Between the transformer (37) and the high voltage input section (36), there is a switch (
39).The printer according to claim 1, wherein the printer is provided with: