JPH0632003A - Printer - Google Patents

Abstract

PURPOSE:To smooth the feed of a printing paper by engaging a guide plate having the holding function and paper-feed guide function of the printing paper with a carriage unit in the manner of the guide plate sliding freely in the printing direction and by interposing a detent-fastening mechanism for integrally moving the guide plate and carriage unit after both of them move right and left. CONSTITUTION:A guide long hole 23 directed to the printing direction being the direction of movement of a carriage unit 20 is made in the mounting plate part 22 of a guide plate 21 in the carriage unit 20. When the carriage unit 20 moves further, a guide pin 26 in contact with the edge of the compressed terminal hole of the guide long hole 23 is biased rightward and the guide plate 21 moves rightward integrally with the carriage 20. When the carriage unit 20 moves further, a print head mounted on the carriage unit 20 is displaced from the left part to the right part in the long hole-shaped printing hole 28 of the guide plate 21. Then, a printing operation by the print head is performed without hindrance while the print head faces the inside of the printing hole 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a printing device such as an electronic typewriter or a daisy wheel printer.

[0002]

2. Description of the Related Art As shown in FIG. 4, such a printing apparatus of this type moves within a range of a moving distance (L) from a solid line position to a one-dot chain line position in a printing direction along a platen roller (1). A print head such as a daisy wheel is mounted on a reciprocating carriage unit (2), and the print paper is supported by a platen roller (1) at every node movement of a predetermined distance corresponding to one character of the carriage unit (2). (3) is struck by a print head and sequentially printed on the print paper (3). And the carriage unit (2)
The platen roller (1) rotates by a predetermined angle at the end of printing in the row direction after moving to the position indicated by the alternate long and short dash line in the figure, or when the carriage unit (2) returns to the initial position indicated by the solid line after the end of printing. The printing paper (3) is fed in the direction of arrow A, and the same operation is repeated to print on the printing paper (3). Further, in the carriage unit (2), a guide plate (4) having a shape curved to the same curvature as the peripheral surface of the platen roller (1) presses the printing paper (3) against the platen roller (1). This guide plate (4) holds the printing paper (3) without moving when printing on the printing paper (3) by the print head, and smoothes the printing paper (3) during paper feeding. It is designed to guide you to feed paper. The printing operation is performed by the print head tapping the printing paper (3) through a printing hole (not shown) formed in the guide plate (4).

[0003]

By the way, since it is necessary to hold the print sheet (3) by the guide plate (4) during the printing operation in the print area around the print head, as described above. Since the plate (4) is fixed to the carriage base (2) and moves integrally, the guide plate (4) that moves integrally with the carriage unit (2) is located on the left and right of the platen roller (1). Due to the relationship between the movement distance (L) of the carriage unit (2) and the cabinet (5) that positions and supports it, the length size in the printing direction is naturally limited, and as shown in FIG. The length for guiding the printing paper (3) at the time of paper feeding is only within a range (d) that is 1/2 or less of the effective paper feeding guide range (D) for 3). Therefore, (D)
An auxiliary guide mechanism for guiding the range (d) is required.

As the auxiliary guide mechanism, a paper feed assist bar (7) having a guide roller (6) as shown in FIG. 6 or a paper feed assist rib (11) as shown in FIGS. 6 and 7 is provided. Has been. In these figures, the same or equivalent parts as in FIG. 4 are designated by the same reference numerals, and as described above, the guide plate (4) is printed by the print head (10) made of a daisy wheel. A printing hole (9) is provided so that printing can be performed on 3).

The paper feed assist bar (7) is supported by being bridged between the left and right support frames (8), and the guide rollers (6) intermittently arranged on the support frames (8) print. Platen roller (1) on paper (3)
Abutted against it. On the other hand, the paper feed assisting rib (11) is provided on the platen roller (1) on the inner surface of the transparent printer cover (11) attached to the cabinet (5) by the hinge portion (13) so as to be openable and closable as shown in FIG. As shown in FIG. 7, the printing paper (3), which is attached to the upper position of the printer at regular intervals and is fed upward by the platen roller (1) and the pinch roller (not shown), is fed to the paper discharge port (14). It is designed to guide you.

However, since any of the above-mentioned auxiliary guide mechanisms is disposed over the platen roller (1) over the entire left-right direction of the apparatus, the external shape is limited, so that the appearance is good and the characteristics are good. There is a problem that it cannot be an arbitrary design shape having. Also, FIG.
In the line of sight (I), the line of sight of the optor to the printed portion is blocked by the paper feed assist ribs (11), and there is a problem in that the visibility is poor and good operability cannot be obtained.

Therefore, the present invention is capable of obtaining a very good printing paper holding function at the time of printing and a smooth paper feeding guide function while the external shape is not restricted and the operator's visibility is good. It is a technical object to provide a printing device that can perform printing.

[0008]

According to the present invention, as a technical means for achieving the above-mentioned object, a printer is constructed as follows. That is, the print head mounted on the carriage unit that reciprocates in the print direction along the platen roller prints on the print paper supported by the platen roller, and the print paper is rotated in the print direction by the rotation of the platen roller. In a printing device that feeds paper in a perpendicular direction, the printing paper is curved to have the same curvature as the peripheral surface of the platen roller and presses the printing paper against the platen roller to hold the printing paper at the time of printing and the printing at the time of paper feeding. A guide plate having a paper feed guide function for the paper is formed to have a length that can face the entire print paper effective guide range that can smoothly feed the print paper, and the guide plate is provided in the carriage unit. The guide plate and the carriage unit are slidably engaged with each other in the printing direction, and the carriage is attached to the guide plate. Jjiyunitto is configured as a feature that it has interposed a fastening mechanism for moving integrally the guide plate after predetermined distance with respect to any horizontal direction.

[0009]

Operation When the carriage unit moves in either the right or left direction, that is, in either the printing direction or the non-printing direction, it slides on the guide plate until the carriage unit has finished moving a predetermined distance by the engaging mechanism. The guide plate is held in the original position, and after the movement of a predetermined distance, the guide plate is moved integrally with the carriage unit. Therefore, since the moving range of the guide plate is much smaller than the moving range of the carriage unit, the guide plate has a dimension significantly longer than the existing one in the printing direction, that is, the effective paper feed guide range of the printing paper. Since the length is such that it can cover the whole, the printing paper can be smoothly fed without providing any conventional paper feeding auxiliary guide mechanism such as the paper feeding auxiliary bar or the paper feeding auxiliary rib. As described above, since the paper feed auxiliary guide mechanism is not required at all, the degree of freedom of the external shape is remarkably improved, and the external shape with good appearance can be obtained, and the line of sight of the operator to the printed portion is blocked. Since there are no objects, the visibility is improved and the operability is significantly improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an exploded perspective view of an essential part of an embodiment of the present invention, in which a moving direction of the carriage unit (20), that is, printing is performed on a mounting plate portion (22) of a guide plate (21) of the carriage unit (20). A guide elongated hole (23) is formed in the direction. On the other hand, the guide plate (21) has a dimension such that the length in the printing direction can cover the entire paper feed effective guide range (D) shown in FIG. 4 for the printing paper (3). As indicated by the arrow
Two pairs of engaging rail portions (24), () which sandwich the mounting plate portion (23) of the carriage unit (20) from above and below and are slidably attached to the mounting plate portion (23) in the printing direction. Two
5) is fixedly installed, and two guide pins (2) which are slidably inserted into the elongated guide holes (23) are provided at the central portion.
6) and (27) are projected. Further, as the length dimension in the printing direction becomes longer, the printing hole (28)
Is formed long. The dimensional relationship between the elongated guide holes (23) and the guide pins (26) and (28) will be described with reference to the explanatory views of FIGS. 2 and 3.

In FIGS. 2 and 3, the platen roller (1) and the guide plate (21) are shown separated from each other for easy understanding. The same or equivalent components are designated by the same reference numerals. 2 shows the case where the carriage unit (20) is at the initial position in the printing direction indicated by the solid line, and the guide pin (27) on the right side is provided at the edge of the right end hole of the guide slot (23). The guide plate (21) is moved to the left by abutting, and the left end portion of the guide plate (21) is brought into contact with the initial side stopper (29) to be positioned. As the printing operation is performed from this state, the carriage unit (2
0) moves while being moved to the right, but the carriage unit (20) moves to the position shown by the alternate long and short dash line so that the edge of the left end hole of the guide elongated hole (23) is located at the left guide pin (2).
6) until it abuts against the guide unit 6), the mounting plate portion (22) of the carriage unit (20) slides on the guide rail portions (24) and (25) of the guide plate (21) and the guide pins (26). , (27) slidably contact the elongated guide holes (23) to maintain the original position, so that the guide plate (21) is stopped at the initial position in contact with the initial side stopper (29).

When the carriage unit (20) further moves from the position indicated by the one-dot chain line in FIG. 2, the guide pin (26) abutting against the edge portion of the left end hole of the guide elongated hole (23) is pressed to the right and the guide plate ( 21) is moved rightward together with the carriage unit (20). This carriage unit (2
0) moves from the solid line position in FIG. 2 to the alternate long and short dash line position,
A print head similar to that shown in FIGS. 5 to 7 mounted on the carriage unit (20) has a guide plate (21).
The printing hole (28) is displaced from the left side portion to the right side portion in the long hole-shaped printing hole (28) to face the inside of the printing hole (28), and the printing operation by the print head is performed without any trouble.

Next, the carriage unit (20) is shown in FIG.
As shown by the solid line in FIG. 5, when the print end position in the row direction is reached, the right end of the guide plate (21) is moved to the end stopper (3
0) to be positioned. Therefore, the guide plate (2
Since the movement distance (1) of 1) is much shorter than the movement distance (L) of the carriage unit (20), the guide plate (21) is moved to the printing paper (3) with respect to the effective guide range of the paper feed. (D) The carriage unit (20) reciprocates within a predetermined moving distance (L) while having a length capable of covering the whole, and can be operated without any trouble. The print area around the moving print head can always be pressed against the platen roller (1) and held stably.

When the carriage unit (20) is located at either the print initial position shown by the solid line in FIG. 2 or the print end position shown by the solid line in FIG. 3, the guide plate (21).
Are brought into contact with the initial side stopper (29) or the end side stopper (30) and are positioned at the positions shown by the solid lines in FIG. 2 or FIG. 3, and the guide plate (21) moves against the printing paper (3). Since the entire paper feed effective guide range (D) is covered, the printing paper (3) can be smoothly fed at any time of the end of printing in the row direction or the return to the initial print position.

In the above embodiment, the guide unit 21 is integrally moved after the carriage unit (20) is moved by a certain distance in any of the left and right directions. 23) and guide pins (26),
Although (27) is exemplified, it may be replaced with another configuration having the same function.

[0016]

As described above, according to the printing apparatus of the present invention, when the carriage unit is moved in any of the right and left directions, the engaging mechanism causes the guide plate to move until the carriage unit has moved a predetermined distance. The guide plate is slid to hold it in its original position, and the guide plate is moved integrally with the carriage unit after moving for a predetermined distance, so that the movement range of the guide plate is significantly smaller than the movement range of the carriage unit. As a result, the guide plate is configured to have a length dimension that can cover the entire effective paper feed guide range of the printing paper, so a conventional paper feed auxiliary bar or paper feed auxiliary guide mechanism such as a paper feed auxiliary rib is provided at all. Even if it is not provided, the printing paper can be smoothly fed, and the printing area portion of the printing paper can be stably held during the printing operation. Therefore, since the conventional paper feed auxiliary guide mechanism is not required at all, the degree of freedom of the external shape is remarkably improved, and it is possible to enhance the commercial value by designing an arbitrary external shape with good appearance and characteristics. Since there is nothing that blocks the operator's line of sight to the printed portion, the visibility of the operator is greatly improved and the operability is significantly improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an initial state of printing, same as above.

FIG. 3 is an explanatory diagram of a state where printing in the row direction is completed.

FIG. 4 is an explanatory diagram of a paper holding function and a paper feed guide function of a conventional printing device.

FIG. 5 is a perspective view of a paper feed auxiliary guide mechanism of a conventional device.

FIG. 6 is a perspective view of another paper feed auxiliary guide mechanism of the conventional apparatus.

FIG. 7 is a cut side view of the same.

[Explanation of symbols]

 1 Platen Roller 3 Printing Paper 20 Carriage Unit 21 Guide Plate 23 Guide Long Hole (Locking Mechanism) 24, 25 Sliding Mechanism 26, 27 Guide Pin (Locking Mechanism) D Paper Feed Effective Guide Mechanism

Claims (1)

[Claims] 1. A printing head mounted on a carriage unit that reciprocates in a printing direction along a platen roller prints on a printing paper supported by the platen roller, and the printing paper is printed by rotation of the platen roller. In a printing device that feeds paper in the direction orthogonal to the direction,
A guide that is curved to have the same curvature as the peripheral surface of the platen roller and has the function of holding the print sheet at the time of printing by pressing the print sheet against the platen roller and the function of guiding the print sheet at the time of sheet feeding The plate is formed in such a length that it can face the printing paper over the entire effective paper feed guide range so that it can be fed smoothly, and the guide plate is slidably engaged with the carriage unit in the printing direction. Further, the guide plate and the carriage unit are provided with an engaging mechanism for integrally moving the guide plate after the carriage unit has moved a predetermined distance in any of left and right directions. apparatus.