JPH07186483A - Carrier shaft attaching and detaching mechanism of printer - Google Patents

Abstract

PURPOSE:To smoothly re-fitting a separated carrier shaft to a printing head even when the printing head is tilted at the time of separation in a printer having a structure temporarily separating one of two carrier shafts from the printing head in order to replace a ribbon. CONSTITUTION:A first carrier shaft 1 is provided to a member 5 on the side of a frame and a second carrier shaft 2 is provided to a member 6 on the side of a cover opened and closed with respect to the frame. A positioning recessed part 52 opened in the opening direction of the cover prescribing the position of the second carrier shaft 2 is provided to the member 5 on the side of the frame and the second carrier shaft 2 is provided so as to be movable in parallel to the direction crossing the opening and closing direction of the cover and energized to the tilting side of a printing head. An inclined edge 53 in an upwardly expanded direction is provided on the tilting side of the printing head of the positioning recessed part 52. The second carrier shaft 2 is held in the state moved to the tilting side of the printing head at the time of the opening of the cover and guided by the inclined edge 53 when the cover is closed to be inserted from the same direction as the tilting direction of the printing head 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer of an information processing apparatus, and for example, when loading an ink ribbon cassette, a carrier shaft for guiding the print head in the print line direction is temporarily detached from the print head. The present invention relates to a mechanism for attaching and detaching the carrier shaft in the printer described above.

[0002]

2. Description of the Related Art In a serial printer which performs printing while moving a print head in the print line direction, a guide is provided for guiding the print head in the print line direction. As this guide, a structure in which the print head is guided by two carrier shafts mounted in parallel is widely used. In such a printer, one of the carrier shafts may have to be detached from the print head when the ink ribbon cassette or the like is mounted.

FIGS. 5 and 6 show an apparatus equipped with a printer of this kind. The apparatus shown in the figure is an original reading apparatus, and a printer unit 10 is provided for printing the numbering and the reading date on the read original. In FIG. 5, 11 is a document feed table, 12 is a document stacked on the paper feed table 11, 13 is a sheet feed roller for feeding the stacked documents 12 one by one to the apparatus, and 14 is a sheet feed roller. A separation pad that abuts on the peripheral surface of the paper roller 13 and separates the sheets passing therethrough one by one, 15 is a sensor for detecting the edge of the sheet, 16 is a document reading unit, 10 is a printer unit, and 17 is a read document. Stackers 21, 21, and 23 are original feed rollers, and 24
Is a discharge roller.

A document passing through the apparatus is illuminated by the light source lamp 25 in the document reading section 16, the read light is reflected by the reflecting mirrors 26 and 27, passes through the imaging lens 28, and forms an image on the one-dimensional image sensor 29. By being read, it is read. A predetermined recording item is printed on the read document by the printer unit 10, and the document is ejected to the stacker 17. The printer unit 10 has a print head 3 and a platen 4 that are opposed to each other with a paper path interposed therebetween. The print head 3 is orthogonal to the paper conveyance direction by the upper and lower two carrier shafts 2 and 1 shown in FIG. It is guided to move in any direction.

With such a structure, when the ink ribbon cassette 7 is loaded in the print head 3, the upper carrier shaft 2 must be separated from the print head 3. Therefore, when the carrier shaft 1 on the lower side is mounted on the frame side of the apparatus and the carrier shaft 2 on the upper side is mounted on the cover side, and the cover is opened for attaching and detaching the ink ribbon cassette 7, the upper carrier shaft 2 prints. It is designed to be detached from the head 3. In the illustrated apparatus, this cover has a structure that is opened and closed by rotating around the shafts provided at both ends of the platen 4,
When the cover is opened, the paper passage above the printer unit 10 is opened.

FIG. 7 shows a conventional mechanism for attaching and detaching the upper carrier shaft (second carrier shaft) 2 in a printer having such a structure. The second carrier shaft 2 is fitted and mounted in a groove 61 in the left-right direction in the figure provided on the cover-side member 6 that is rotatably supported around the center 64 of the platen 4, and is lined. The spring 8 biases the groove 61 toward the rear end side. On the other hand, the member 5 on the frame side has a positioning recess 52 opened upward to receive the second carrier 2.
The upper part of the positioning recess 52 is provided with an inclined edge 9 for guiding the second carrier shaft 2 to a fixed position at the bottom of the recess.

The lower carrier shaft (first carrier shaft) 1 is mounted on a member 5 on the frame side so that the position thereof can be slightly adjusted in the left-right direction in the drawing. The print head 3 is rotatably and slidably mounted on the first carrier shaft 1, and the upper U-shaped guide recess 31 provided at the upper end of the print head 3 and the second carrier shaft 2 slide. By freely fitting, tilting of the print head 3 about the first carrier shaft 1 is prevented. Then, the position (print gap) between the print head 3 and the platen 4 is adjusted by adjusting the position of the first carrier shaft 1 in the left-right direction in the drawing.

In the above structure, the cover is attached to the fulcrum 64.
By pivoting upward and opening around, the second carrier shaft 2 is disengaged from the positioning recess 52 on the frame side and the guide recess 31 of the print head, and the ink ribbon cassette 7 can be loaded into the print head 3. Become. Further, when the cover is closed, the second carrier shaft 2 is guided by the upper sloping edge 9 of the positioning recess and fitted into the bottom of the positioning recess 52, and at the same time, fitted into the guide recess 31 of the print head. Then, the print head 3 is held in a regular posture.

[0009]

However, in the structure of FIG. 7, when the second carrier shaft 2 is disengaged from the print head 3, due to the support structure of the print head 3 on the first carrier shaft 1 and the weight balance. The print head 3 may tilt in the direction opposite to the fulcrum 64 of the cover. This is, for example, as shown in FIG. 6, when the print head 3 is mounted with a slight upward inclination, or when the first carrier shaft 1 is moved in the left-right direction in FIG. 7 to adjust the print gap. Occur.

When such tilting of the print head 3 occurs when the second carrier shaft 2 is disengaged, when the second carrier shaft 2 is returned, the guide recesses of the second carrier shaft 2 and the print head are formed. The fitting with 31 may not be performed properly. For example, in the structure of FIG. 7, when the print head 3 tilts to the right side of the drawing, the second carrier shaft 2 comes in from the left side of the drawing, so that the second carrier shaft 2 and the guide recess 31 fit together. When the print gap is adjusted by changing the position of the first carrier shaft 1 in particular, the tilt angle of the print head 3 also changes, so that the second carrier shaft 2 and the guide recess 31 that descend are lowered. There is a problem in that the print head 3 is collided with the upper end portion thereof and a large mechanical load is applied to the print head 3.

The present invention has been made to solve the above problems. When one of the carrier shafts is detached, the print head 3 is moved in the direction opposite to the approach direction of the carrier shaft 2 when the print head 3 is remounted. It is an object to ensure that the carrier shaft 2 and the guide recess 31 of the print head can be fitted smoothly even when tilted.

[0012]

A printer to which the structure of the present invention is applied is a first printer in which print heads 3 are mounted in parallel.
And the second carrier shafts 1 and 2 are supported so as to be movable.
The carrier shaft 2 is mounted on a cover side member 6 that opens and closes with respect to the frame, and the cover is opened in a direction in which the two carrier shafts 1 and 2 are separated from each other, and when the cover is opened, the second shaft is opened. The printer has a structure in which the carrier shaft 2 and the print head 3 are disengaged from each other and the print head 3 is slightly tilted around the first carrier shaft 1.

The frame-side member 5 that supports the first carrier shaft 1 is provided with a positioning recess 52 that opens in the opening direction of the cover that defines the position of the second carrier shaft 2. The second carrier shaft 2 is mounted in such a manner that it can move in parallel in a direction intersecting the moving direction of the second carrier shaft when the cover is opened and closed, and is biased to a moving end on one side thereof. On one side of the positioning recess 52 (on the biasing side of the second carrier shaft), there is provided a guide edge 53 that is inclined in a direction of expanding upward. The one side is the tilting side of the print head 3 around the first carrier shaft 1 when the linkage with the second carrier shaft 2 is lost.

In the above structure, the first carrier shaft 1 is mounted so that its position can be adjusted in the direction in which the print head 3 advances and retracts toward the printing paper surface, and the cover has the second carrier shaft 2.
It is particularly suitable for a printer having a structure in which it is opened and closed by rotating around a fulcrum 64 provided on the side opposite to the tilting side of the print head 3 when the linkage with the.

[0015]

In the above structure, the second carrier shaft 2 separated from the positioning recess 52 of the print head 3 and the frame side member 5 when the cover is opened is the print head when the second carrier shaft 2 is separated. 3 will be held in a state of being moved to the tilting side. Therefore, when the cover is closed and the second carrier shaft 2 is inserted into the positioning recess 52 of the member 5 on the frame side, the second carrier shaft 2 is guided to the inclined edge 53 at the upper part of the positioning recess and the print head 3 It is inserted into the bottom of the positioning recess 52 from the same direction as the tilting direction of the above and is positioned. Therefore, the tilting direction of the print head 3 and the entering direction of the second carrier shaft 2 coincide with each other, so that the second carrier shaft 2 is smoothly fitted into the guide recess 31 of the print head.

[0016]

1 to 4 show an embodiment of the present invention, which shows the structure of a support and guide portion for a second carrier shaft. The second carrier shaft 2 is mounted by fitting both ends thereof into a horizontal groove 61 provided in a plate-shaped member 6 integrated with the cover. A stopper 62 is provided at the outlet of the groove 61, so that the second carrier shaft 2 has a groove 61.
It is movable in the extending direction. A tension spring 63 is mounted between the second carrier shaft 2 and the cover side member 6, and the tension spring 63 urges the second carrier shaft 2 to the stopper 62 side of the groove 61, that is, to the right side in the drawing. is doing.

On the other hand, at the upper edge of the frame-side member 5 provided adjacent to and facing the cover-side member 6, the bottom portion 5 for positioning the second carrier shaft 2 in the left-right direction in the figure.
A positioning recess 52 with 1 is provided. The positioning recess 52 is open upward, and an inclined edge 53 is provided on the upper part thereof. This inclined edge 53 is the second
The carrier shaft 2 is provided in a direction in which it is biased, that is, in the position of the positioning recess 52 on the right side of the drawing, which is inclined so that the upper side opens.

The cover side member 6 is opened and closed by rotating around a fulcrum 64 on the side opposite to the urging direction of the second carrier shaft 2. Print head mounting structure and print head and second
The engagement relationship with the carrier shaft is as described in FIG.

2 to 4 show the operation when the second carrier shaft 2 is reattached. In the state where the cover is opened, the second carrier shaft 2 moves upward and is separated from the positioning recess 52 and the guide recess 31 of the print head 3. In this disengaged state, the second carrier shaft 2 is located at the moving end of the groove 61 on the right side in the figure by the urging force of the tension spring 63. Further, the print head 3 which is disengaged from the second carrier shaft 2 is tilted slightly to the right side of the drawing around the first carrier shaft 1.

When the cover is closed from this state, the second carrier shaft 2 comes into contact with an inclined edge 53 provided on the right side of the positioning recess 52 as shown in FIG. Guided to the bottom 51 of the place. That is, the second carrier shaft 2 has the bottom 51 of the recess, which is the regular mounting position.
Further, the inclined edge 53 enters along the inclined edge 53, and the inclination direction of the inclined edge 53 is the same as the inclination direction of the guide recess 31 of the tilted print head. Therefore, the second carrier shaft 2 guided along the beveled edge 53 is smoothly guided into the guide recess 31 of the print head, and when the cover is completely closed, the second carrier shaft 2 is shown in FIG. As shown, the bottom portion 51 of the recess is fitted and positioned, and the posture of the print head 3 is returned to the normal posture.

[0021]

According to the structure of the present invention described above,
After one carrier shaft is detached from the print head guided by the two carrier shafts and the ink ribbon cassette or the like is loaded, when the carrier shaft is reloaded, the carrier shaft that enters toward the print head and printing is performed. It is possible to avoid a risk that the head interferes with the print head, the re-mounting is not smoothly performed, and a mechanical load is applied to the print head.
Further, since the carrier shaft is guided by using the opening / closing operation of the cover, there is an effect that the opening / closing operation of the cover can be smoothly performed with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment.

FIG. 2 is a side view of a main part showing a detached state of a carrier shaft.

FIG. 3 is a side view of an essential part showing a state in which the carrier shaft is being attached and detached.

FIG. 4 is a side view of a main part showing a mounted state of a carrier shaft.

FIG. 5 is a schematic side view showing an example of an apparatus provided with a printer.

6 is a side view of a printer portion of the apparatus shown in FIG.

FIG. 7 is a side view of an essential part showing a conventional carrier shaft attaching / detaching mechanism.

[Explanation of symbols]

 1 1st carrier shaft 2 2nd carrier shaft 3 Print head 5 Frame side member 6 Cover side member 52 Positioning recess 53 Inclined edge 64 Support point

Claims (2)

[Claims] 1. A first print head (3) mounted in parallel.
And the second carrier shaft (1, 2) is movably supported, and the first carrier shaft (1) is attached to the frame side member (5),
The second carrier shaft (2) is mounted on the cover side member (6) that opens and closes with respect to the frame, and the cover is opened in the direction in which the two carrier shafts (1, 2) are separated from each other, When the printer is opened, the connection between the second carrier shaft (2) and the print head (3) is disengaged and the print head (3) is slightly tilted around the first carrier shaft (1). In the attachment / detachment mechanism, the frame side member (5) has a positioning recess (52) opened in the opening direction of the cover that defines the position of the second carrier shaft (2),
The second carrier shaft (2) is movable in parallel in a direction crossing the moving direction of the second carrier shaft when the cover is opened and closed, and is urged and mounted on the moving end on one side of the second carrier shaft (2).
A guide edge (53) inclined in a direction of expanding upward is provided on the one side of the (52), and the one side has a second carrier shaft.
A carrier shaft attaching / detaching mechanism, which is a tilting side around the first carrier shaft (1) of the print head (3) when the link with (2) is disengaged. 2. The first carrier shaft (1) is mounted so that its position can be adjusted in a direction in which the print head (3) advances and retreats toward the printing paper surface, and the cover is attached to the second carrier shaft (2). 2. The carrier shaft attaching / detaching mechanism according to claim 1, which is opened and closed by rotating around a fulcrum (64) provided on a side opposite to a tilt side of the print head (3) when the link is disengaged.