JPH0647735Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing apparatus that conveys a medium to a printing unit by a guide of a medium guide to perform printing.

[Conventional technology]

Printing devices used for printing on media such as passbooks and slips in financial institutions such as banks are well known. As one of them,
When feeding a medium onto the platen of the printing unit, there is one in which an opening formed on the platen is closed in order to move the print head.

FIG. 3 is a perspective view of an essential part of a conventional printing apparatus of this type. In FIG. 3, 10 is a platen provided in the printing section, and a print head (not shown) is arranged so as to face the platen 10. The print head also moves parallel to the platen 10 in a direction orthogonal to the medium transport direction (not shown).

Lower medium guide plates 2a and 2b are arranged and fixed in front of and behind the platen 10.

Reference numerals 1 and 3 denote medium guide plates arranged to face the medium guide plates 2a and 2b. One medium guide plate 1 is fixed, but the other medium guide plate 3 is the medium guide plate 1. It is possible to move toward and away from.

Reference numeral 5 is a guide block for guiding the movement of the medium guide plate 3, and 4 is an arm member 4 for moving the medium guide plate 3 in the arrow direction A.

The arm member 4 has a base portion fixed to a rotatable shaft 6 and a central portion connected to a plunger magnet 8 via a link 7, and further has a spring 9 for arrow A.
And is urged in the opposite direction.

The medium guide plate 3 is stopped by a limiter (not shown) when the medium guide plate 3 moves in the direction of arrow A, and the tip 1a of the medium guide plate 1 and the tip 3a of the medium guide plate 3 are also stopped.
Are formed in a comb shape so that they mesh with each other without being caught.

Next, the operation of the above configuration will be described.

At the time of printing, the print head is retracted upward in advance.

Then, when the plunger magnet 8 is excited, the arm member 4 is pulled by the link 7 and rotates around the shaft 6, the medium guide 3 moves in the arrow direction A, and the tip 3a of the medium guide plate 3 moves. Since it meshes with the tip 1a of the plate 1, the opening formed between the medium guide plates 1 and 3 is closed.

As a result, no opening is present on the platen 10, and in this state, a medium (not shown) is conveyed between the medium guides 1 and 2b or between 2a and 3 by a roller or the like (not shown), and the medium reaches the platen 10. When sent, it is detected by a sensor (not shown) or the like, and the excitation of the plunger magnet 8 is cut off.

As a result, the guide arm 4 is reversely rotated by the urging force of the spring 9, and the medium guide plate 3 is returned to its original position, so that an opening is formed on the platen 10.

Then, the print head descends and prints on the medium while the print head moves on the platen 10.

[Problems to be solved by the invention]

However, since the above-mentioned conventional printing device is designed in consideration of the maximum width 216 mm of the medium used in banks, etc., the movable medium guide plate is large and heavy. It is necessary to increase the strength of the supporting member that can sufficiently withstand the load from the medium guide in order to prevent the supporting member, such as the guide block and the guide arm, that supports the media from being destroyed by the large load. However, there is a problem that the cost is high.

In addition, since many parts are required to move the medium guide plate, there is a problem that the device becomes large and expensive.

The present invention has been made in order to solve such a problem, and can guide a medium to smoothly pass through a printing portion without moving a large and heavy medium guide plate, and has a small number of parts and a small size. It is an object of the present invention to realize a printing device provided with a guide mechanism that is inexpensive.

[Means for solving problems]

To achieve this object, the present invention provides a platen arranged in a printing unit, a print head arranged to face the platen and printing on a medium on the platen while moving along the platen, A first medium guide plate provided in front of and behind the platen and a second medium guide plate provided so as to face the first medium guide plate and having an opening so as not to hinder the movement of the print head during the printing operation. In the printing apparatus including the medium guide plate, a taper portion is formed in the second medium guide plate so that the opening gradually expands from the middle toward one side end, and the taper is formed at the tip of the print head. Is characterized in that an auxiliary guide plate having a length from the medium transport reference surface located on the other side of the first medium guide plate to the spread start end of the tapered portion is provided.

[Action]

In the present invention having such a configuration, during printing, the print medium is conveyed between the first medium guide plate and the second medium guide plate, and the leading end of this medium is the end of the second medium guide plate. Although it passes through the opening between the parts, the part of the length from the reference surface of the opening to the spreading start end of the tapered part is closed by the auxiliary guide plate provided at the tip of the print head. With this guide of the auxiliary guide plate, it smoothly passes without being caught in the opening.

Further, at this time, even if an obliquely upward bent portion is formed at the corner of the medium, when the bent portion hits the taper portion of the second medium guide plate, the tape is gradually corrected and guided by the taper portion.

Therefore, according to this, the medium can be guided and smoothly passed through the printing portion without moving the large and heavy medium guide plate, the occurrence of jam can be reliably prevented, and the auxiliary guide plate is provided at the tip of the print head. Since the guide mechanism can be configured simply by providing the printer, a printing apparatus having a small number of parts and a small and inexpensive guide mechanism can be realized.

Further, since the opening portion is always present between the end portions of the first medium guide plate, even if a jam of the medium occurs in the printing portion, the jammed medium can be easily removed at the opening portion. Is possible.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the printing apparatus according to the present invention, and FIG. 2 is a plan view of the embodiment shown in FIG.

In the figure, 10 is a platen, 11 is a print head, both of which are arranged in the print section so as to face each other, and the print head 11 moves parallel to the platen 10 in the direction orthogonal to the transport direction of the medium 18. Has become.

2a and 2b are lower medium guide plates (first medium guide plate)
It is fixed at the front and back of the platen 10.

Reference numerals 13a and 13b denote upper medium guide plates (second medium guide plates) so as to face the medium guide plates 2a and 2b. In this embodiment, the medium guide plates 13a and 13b are also fixed. An opening is formed between the ends of the medium guide plates 13a and 13b so as not to hinder the movement of the print head 11 during the printing operation.

12 is an auxiliary guide plate fixed to the tip of the print head 11,
The auxiliary guide plate 12 has a rectangular shape that is long in the direction of the platen 10, and the width in the medium transport direction is the medium guide plate.
The width is slightly smaller than the width of the opening formed between the ends of 13a and 13b, and it is integrated with the print head 11 by the platen.
You can move along 10.

Reference numeral 16 is a notched portion provided at equal intervals on the medium guide plate 13a, 17 is a square hole provided at equal intervals on the medium guide plate 13b, and clamp rollers are provided at the positions of the notch portion 16 and the square hole 17.
15 is a feed roller 1 arranged on the side of the medium guide plates 2a, 2b
It is provided so as to face each other and move up and down.

Further, slanting portions 19a, 19b bent obliquely upward are formed at end portions of the medium guide plates 13a, 13b facing each other, and further, the opening portions are formed in the medium guide plates 13a, 13b. Taper part that gradually expands from one end to the other
20a and 20b are formed.

Reference numeral 21a is a medium regulating plate provided along one side of the medium guide plates 2a, 2b, and 21b is a medium regulating plate provided along the other side of the medium guide plates 2a, 2b. Regulation plate 21
Reference numeral b denotes a conveyance reference surface of the medium 18, and the dimension of the auxiliary guide plate 12 in the longitudinal direction is the medium regulation plate 21 as the conveyance reference surface.
The length is from b to the spreading start end of the tapered portions 20a and 20b.

Next, the operation of the above configuration will be described.

First, based on a medium detection signal from a sensor (not shown) or the like, the print head 11 and the medium guide 12 move along the platen 10 and are brought closer to the medium regulation plate 21b side and stopped.

In this state, the medium 18 is clamped by a feed roller and a clamp roller (not shown), and is conveyed between the medium guides 2b and 13b along the medium regulating plate 21b.

The medium 18 is clamped by the feed roller 14 and the clamp roller 15 in front of the printing section, and is fed to the printing section along the medium regulation plate 21b by the rotation of the feed roller 14.

At this time, the tip of the medium 18 is the medium guide on the print head 11 side.
Although it will pass through the opening formed between the end portions of 13a, 13b, since a part of this opening is closed by the auxiliary guide plate 12 provided at the tip of the print head 11, The tip is smoothly guided by the guide of the auxiliary guide plate 12 without being caught in the opening.

Further, at this time, even if an obliquely upward bent portion 18a as shown in FIG. 2 is formed at the corner of the medium 18, when this bent portion 18a hits the taper portion 20a of the medium guide plate 13a, the taper portion 20a
Guided while being gradually corrected by a.

Accordingly, the leading edge of the medium 18 passes through the platen 10 of the printing section without jamming and is conveyed between the medium guide plates 2a and 13a.

Then, when the medium 18 reaches a predetermined position, the feed roller
The rotation of 14 is stopped, and the print head 11 prints on the medium 18.

[Effect of device]

As described above, according to the present invention, the taper portion is formed so that the opening provided in the second medium guide plate gradually expands from the middle toward one side end, and the first end is provided at the tip of the print head.
Of the medium guide plate on the other side of the medium guide plate, the auxiliary medium guide plate having a length from the medium transport reference surface to the spread start end of the tapered portion is provided. And a second medium guide plate,
Further, when the front end of the medium passes through the opening between the ends of the second medium guide plate, the front end of the medium is smoothly guided by the guide of the auxiliary guide plate without being caught in the opening. Even if a diagonally upward bent portion is formed at the corner of the medium, when the bent portion hits the taper portion of the second medium guide plate, the tape is gradually corrected and guided by the taper portion.

Therefore, according to this, the medium can be guided and smoothly passed through the printing portion without moving the large and heavy medium guide plate, the occurrence of jam can be reliably prevented, and the auxiliary guide plate is provided at the tip of the print head. Since the guide mechanism can be configured only by providing the printer, it is possible to obtain an effect that it is possible to realize a printing apparatus having a small-sized and inexpensive guide mechanism with a small number of parts.

Further, since the opening is always present between the ends of the first medium guide plate, even if a jam of the medium occurs in the printing portion, the jammed medium can be easily removed at the opening. The effect that it becomes possible is also obtained.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a printer according to the present invention, FIG. 2 is a plan view of the embodiment shown in FIG. 1, and FIG. 3 is a perspective view of a main part of a conventional printer. 10 ... Platen, 11 ... Print head, 12 ... Auxiliary guide plate, 2a, 2b ... Medium guide plate, 13a, 13b ... Medium guide plate, 18 ... Medium, 20a, 20b ... Tapered part

Claims (1)

[Scope of utility model registration request] 1. A platen arranged in a printing unit, a print head arranged to face the platen and printing on a medium on the platen while moving along the platen, and a print head provided before and after the platen. A first medium guide plate, and a second medium guide plate that is provided so as to face the first medium guide plate and that has an opening so as not to hinder the movement of the print head during the printing operation. In a printing device provided with the first medium guide plate, a taper portion is formed in the second medium guide plate so that the opening gradually widens from the middle toward one end, and the first head is provided at a tip of the print head. A printing apparatus comprising: an auxiliary guide plate having a length extending from a medium transport reference surface located on the other side of the medium guide plate to a spreading start end of the tapered portion.