JPH06305208A - Mounting structure of ribbon protector - Google Patents

Abstract

PURPOSE:To make positioning operation unnecessary and no breakage occurring even when the top part of the medium to be carried interferes. CONSTITUTION:A tray part 20a, which is to be attached to an accepting part formed on a hard protector, is formed at the center of a ribbon protector 20. In addition, at both ends of the tray part 20a, slopes 20b and 20c for guiding the tip part of a bankbook are formed. Further, at one end of the ribbon protector 20, a bent-up part 23 for relieving the force applied to the ribbon protector 20 is formed. At the other end of the ribbon protector, a fixing part 22, by which the ribbon protector is fixed to the hard protector, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbon protector mounting structure for preventing contact between an ink ribbon and a print medium in a printer.

[0002]

2. Description of the Related Art Conventionally, in a printing section of a printer, a ribbon protector is arranged between a medium and an ink ribbon to prevent contamination of the medium due to contact between the ink ribbon and the medium during conveyance of the medium. FIG. 6 is a schematic perspective view showing a conventional printing unit.

In the drawing, a carriage 1 is a print head 2
And an ink ribbon cassette 6 are installed, and the main shaft 3
It is supported by and is movable in a direction parallel to the platen 7. A hard protector 4 that protects the print head 1 is attached to the carriage 1, and a ribbon protector 5 is attached to the hard protector 4.
The platen 7 is fixed to a rack 8, and the rack 8 meshes with a pinion gear 9. Therefore, when the pinion gear 9 is rotated by a drive source (not shown), the platen 7 moves in the directions of arrows A and B.

Next, the shape and attachment of the ribbon protector 5 will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view showing a conventional ribbon protector, and FIG. 8 is a front view showing a mounting state of the conventional ribbon protector.
As shown in FIG. 7, a wire escape hole 10 is formed in the central portion of the ribbon protector 5. In both figures, the ribbon protector 5 is formed by bending so as to follow the outer shape of the hard protector 4, and both ends are screwed to the hard protector 4. Ink ribbon 11
Is arranged between the print head 2 and the hard protector 4.

Next, the operation of the printer using the ribbon protector 5 will be described with reference to FIG. The pinion gear 9 is driven by a drive source (not shown) to retract the platen 7 in the arrow B direction, and the print medium is not shown in the direction (arrow D direction) orthogonal to the moving direction of the print head 2. Carry a passbook. When this passbook is sent to the printing position, the platen 7 is moved in the direction of arrow A to bring the passbook into pressure contact with the ribbon protector 5. After that, the platen 7 is retracted from the print head 2 in the direction of arrow B by a predetermined distance to adjust the platen gap. The printing unit 6 is the main shaft 3
Move along and print. During printing, the ribbon protector 5 prevents the ink ribbon 11 and the passbook from coming into contact and becoming dirty.

A ribbon protector 5 having another shape will be described with reference to FIGS. 9 and 10. FIG. 9 is a perspective view showing another conventional ribbon protector, and FIG. 10 is a front view showing the attached state of another ribbon protector. In FIG. 9, the ribbon protector 5a is formed by bending, and the wire escape hole 10a is formed in the central portion. As shown in FIG. 10, the ribbon protector 5a is screwed to the protector clamp 4b in a state where the central portion of the ribbon protector 5a projects downward from the protector clamp 4b. The protector clamp 4b is screwed to the hard protector 4a.

[0007]

However, in the above-mentioned conventional ribbon protector, since the shape cannot be accurately formed by bending, the tip of the print head and the wire of the ribbon protector when the ribbon protector is attached to the hard protector. It was necessary to perform adjustment work for alignment with the escape hole. Even if the platen is retracted during medium transport, the ribbon protector is attached to the platen side of the hard protector or protrudes from the hard protector to the platen side. The end on the direction side sometimes interfered. Since the ribbon protector is made of thin stainless steel, the ribbon protector may be damaged when a medium having a large thickness such as a passbook interferes with the ribbon protector. Therefore, the ribbon protector is treated as a consumable item.

The present invention eliminates the above problems, eliminates the need to adjust the position of the ribbon protector, and provides a ribbon protector mounting structure which has a long service life and is not damaged even if the medium interferes during medium transportation. With the goal.

[0009]

In order to solve the above problems, the present invention is directed to a ribbon protector attached to a mounting member and arranged between an ink ribbon and a medium to prevent contact between the ink ribbon and the medium. In the mounting structure of the above, there is provided a dish portion formed on the ribbon protector and having a concave side on a side facing the ink ribbon, and a receiving portion formed on the mounting member for receiving the dish portion of the ribbon protector. It is a thing.

As another means for solving the problems, a tray portion formed on the ribbon protector and having a concave side on the side facing the ink ribbon, and a tray portion formed on the attachment member receive the tray portion of the ribbon protector. A receiving portion may be provided, and the distance from the ribbon protector to the medium may be set longer than the distance from the mounting member to the medium.

[0011]

According to the means for solving the problems, when the dish portion of the ribbon protector is received by the receiving portion of the mounting member, the ribbon protector is positioned. As a result, the work of adjusting the position of the ribbon protector becomes unnecessary. Further, when the leading portion of the medium hits the dish portion of the ribbon protector during the medium transport, the leading portion is guided in the transport direction along the dish portion. Therefore, the ribbon protector will not be damaged even if the medium strikes.

According to another solution, since the distance from the medium to the ribbon protector is longer than the distance from the medium to the mounting member, the medium is conveyed without contacting the ribbon protector. Therefore, the medium will not hit the ribbon protector and be damaged.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. Note that elements common to the drawings are given the same reference numerals. 1 is a perspective view showing a ribbon protector of an embodiment according to the present invention, and FIG. 2 is a perspective view showing a printer of the embodiment.

First, in FIG. 2, the platen 7 of the printer 30 is fixed to the racks 8 and 12 on both sides thereof.
The teeth of the racks 8 and 12 mesh with the pinion gears 9a and 9b. These pinion gears 9a and 9b are fixed to the shaft 13, and the pinion gear 9a includes the gear 15 and
The driving force of the motor 17 is transmitted via the motor gear 16. Therefore, when the motor 17 is rotated, the platen 7 moves toward or away from the print head 2 and presses or releases the passbook 18, which is a print medium, against the hard protector 24 described later.

Guide roller 3 provided on the carriage 1
The guide beam 32 is sandwiched between 3a and 33b and guides the movement of the carriage 1. A hard protector 24 is attached to the carriage 1, and a ribbon protector 20 is attached to the center of the hard protector 24. This will be described in detail later. Other structures are the same as the conventional one.

Next, the ribbon protector 20 and the hard protector 2 which is a mounting member of the ribbon protector 20.
The shape of No. 4 will be described with reference to FIGS. 1 and 3. Figure 3
[Fig. 3] is a perspective view showing a hard protector of the embodiment. Figure 1
In the above, the ribbon protector 20 is formed by drawing so that the central portion becomes the dish portion 20a, and the material thereof is the same as the conventional one. The concave side of the ribbon protector faces the ink ribbon 11, and the convex side faces the platen 7. A wire escape hole 21 is formed in the center of the dish 20a. Further, inclined portions 20b and 20c are formed on the sides of the plate portion 20a in the directions of arrows D and C, and fixed portions 22 and bent and bent portions 23 are formed at both ends. The bent and raised portion 23 is bent and raised on the concave side of the ribbon protector 20. With the above, the ribbon protector 20
Is made of. Next, regarding the hard protector 24, FIG.
It will be described based on.

The hard protector 24 is formed with a receiving portion 25 for mounting the dish portion 20a of the ribbon protector 20 shown in FIG. 1. The receiving portion 25 has a side facing the inclined portions 20b and 20c of the ribbon protector 20 which will be described later. The chamfered portions 25a and 25b are formed. Further, the hard protector 24 is provided with guide bars 26 and 27 for attaching the fixed portion 22 and the bent and raised portion 23 of the ribbon protector 20. A hole 26 is formed in the lower center of the guide bar 26.
a is formed, and the bent and raised portion 23 of the ribbon protector 20 is inserted into the hole 26a in a pressure contact state. The guide bar 27 includes the hard protector 2
The fixing portion 22 of the ribbon protector 20 is sandwiched between the
The screws 27a are fixed to the hard protector 24 together with the ribbon protector 20. The hard protector 24 is configured as described above, and when the ribbon protector 20 is attached to the hard protector 24, the distance g from the platen 7 of the ribbon protector 20 is larger than the distance h from the platen 7 of the hard protector 24 as shown in FIG. Also becomes longer. FIG. 4 is a side sectional view showing an attached state of the bent and raised portion of the ribbon protector.

Next, the operation of the printer using the ribbon protector 20 and the hard protector 24 will be described with reference to FIGS. FIG. 5 is a side sectional view showing the relationship between the ribbon protector and the chamfered portion of the hard protector. First, in the assembly work, the receiving portion 2 of the hard protector 24
The plate portion 20a of the ribbon protector 20 is attached to 5.
Next, as a printing operation, first, the motor 17 is driven, and its rotational force is transmitted to the pinion gear 9a via the motor gears 16 and 15. The rotation of the pinion gear 9a is further transmitted to the pinion gear 9b via the shaft 13 to retract the platen 7 in the arrow B direction. After this, the passbook 18 is conveyed to the print position (direction of arrow D). At this time, when the leading portion of the passbook 18 hits the ribbon protector 20 shown in FIG. 5, the inclined portion 20c guides the leading portion in the transport direction. When the leading portion of the passbook 18 hits the hard protector 24, the chamfered portion 25a guides the leading portion in the transport direction. When the passbook 18 is conveyed to the print position, the platen 7 is moved to the arrow A
The passbook 18 is pressed against the hard protector 20c. Then, in order to adjust the platen gap, the platen 7 is moved in the arrow B direction by a predetermined distance. After that, the carriage 1 is guided by the guide beam 32 and moves along the main shaft 3, and the print head 2 prints on the passbook 18. During this time, the ribbon protector 20 prevents the passbook 18 and the ink ribbon 11 from coming into contact with each other and soiling the passbook 18.

When the page is changed and printed, first the platen 7
Is moved in the direction of arrow B. Next, the passbook 18 is conveyed in the direction of the arrow D, passed through the print position, and sent to a page break unit (not shown). Then, after a page break, the passbook 18 is conveyed again to the print position (direction of arrow C) and printing is performed. The leading portion of the passbook 18 conveyed at this time is the inclined portion 2 of the ribbon protector 20.
When it hits 0b, the inclined portion 20b guides the leading portion in the transport direction. Even if the leading end of the passbook 18 hits the chamfer 25b of the hard protector 24, the chamfer 25
In b, the leading portion is guided in the printing direction.

When the ribbon protector 20 is pushed up toward the print head 2 by the unevenness of the passbook 18 during printing, the bent and raised portion 23 moves the hole 26a of the guide bar 26 in the arrow E direction as shown in FIG. Then, the ribbon protector 20 bends toward the print head 2 side. When the ribbon protector 20 is pushed down toward the passbook 18 due to the variation in the thickness of the ink ribbon 11, the bent and raised portion 23 moves the hole 26a in the arrow E direction, and the ribbon protector 20 bends toward the passbook 18 side. When the pressing from the passbook 18 or from the ink ribbon 11 is released, the bent and raised portion 23 moves in the arrow F direction. This makes passbook 1
Even if the ribbon protector 20 receives a pressure due to the unevenness of 8 and the variation in the thickness of the ink ribbon 11, the bent and raised portion 23 moves in the hole 26a and releases the force applied to the ribbon protector 20.

[0021]

As described above in detail, according to the present invention, the tray portion is formed on the ribbon protector, and the ribbon protector is mounted at a distance from the medium so as to be separated from the mounting member. Interference with the ribbon protector can be avoided. Even if the leading edge of the medium to be conveyed comes into contact with the tray of the ribbon protector, the medium is guided in the conveying direction along the inclination of the tray, so that the ribbon protector is damaged as in the past. There is no. Also, even if the ribbon protector receives pressure due to unevenness on the medium surface and variations in ink ribbon thickness by forming a bent and raised part at one end of the ribbon protector and inserting it into the hole of the mounting member, this bending The raised part moves through the hole,
Release the force applied to the ribbon protector. Therefore, the ribbon protector does not deform. Further, by mounting the tray portion of the ribbon protector to the receiving portion formed in the mounting member, the ribbon protector is positioned, and as a result, it is not necessary to perform the position adjustment between the print head and the wire clearance hole of the ribbon protector.

[Brief description of drawings]

FIG. 1 is a perspective view showing a ribbon protector of an embodiment according to the present invention.

FIG. 2 is a perspective view showing a printer of an embodiment.

FIG. 3 is a perspective view showing a hard protector of an embodiment.

FIG. 4 is a side sectional view showing an attached state of a bent and bent portion.

FIG. 5 is a side sectional view showing an attached state of the ribbon protector.

FIG. 6 is a schematic perspective view showing a conventional printing unit.

FIG. 7 is a perspective view showing a conventional ribbon protector.

FIG. 8 is a front view showing a mounted state of a conventional ribbon protector.

FIG. 9 is a perspective view showing another conventional ribbon protector.

FIG. 10 is a front view showing an attached state of a conventional ribbon protector.

[Explanation of symbols]

 20 Ribbon protector 20a Plate part 20b Inclined part 23 Bending and raising part 24 Hard protector

Claims (5)

[Claims] 1. A ribbon protector mounting structure, which is mounted on a mounting member and is arranged between an ink ribbon and a medium to prevent contact between the ink ribbon and the medium, wherein the ink ribbon is formed on the ribbon protector. A ribbon protector mounting structure comprising: a dish portion having a concave side on a side facing the plate, and a receiving portion formed on the attachment member for receiving the dish portion of the ribbon protector. 2. The ribbon protector mounting structure according to claim 1, wherein the distance from the ribbon protector to the medium is longer than the distance from the mounting member to the medium. 3. The ribbon protector mounting structure according to claim 1, wherein the dish portion is formed by drawing. 4. The ribbon protector mounting structure according to claim 3, wherein the mounting member is chamfered from a surface of the mounting member facing the medium toward the receiving portion. 5. A ribbon protector mounting structure which is mounted on a mounting member and is arranged between an ink ribbon and a medium to prevent contact between the ink ribbon and the medium, the ribbon protector mounting structure being formed in a central portion of the ribbon protector. A dish portion whose side facing the ink ribbon is a concave side, a bend-raised portion formed at one end of the ribbon protector, a receiving portion formed in the attachment member and receiving the dish portion of the ribbon protector, A ribbon protector mounting structure comprising: a hole formed in the mounting member; the bent and bent portion is inserted into the hole in a pressure contact state; and the other end of the ribbon protector is fixed to the mounting member.