JPH0363150A - Recorder - Google Patents

Abstract

PURPOSE:To prevent deviation of a recording position on a recording sheet due to protrusion of the sheet by forming the edge of a feed roller opening of a guide at the downstream side of a recording sheet feeding direction in a shape for guiding the sheet to a feed roller contact direction of the outer periphery of a platen roller. CONSTITUTION:The sectional shape of an edge 5c is formed in a wedge shape, the corner of the end is disposed near a contact point (contact) P of a platen roller 3 and a rear feed roller 4b, and the extension face of the upper surface of the edge 5c in contact with a cardboard 6 ls passed through the point P. When the lower surface of the cardboard 6 is recorded, the end of the cardboard 6 is guided toward the point P of the outer periphery of the roller 3 by the edge 5c and pressed to the vicinity of the point P if the end of the cardboard 6 is moved to a position just removed from the roller 4b when the rotation of the roller 3 for line feeding is stopped. Thus, the end of the cardboard 6 is not collided with the roller 4b to protrude.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a recording device, and in particular, a platen roller, a paper pan that guides a recording sheet along the outer peripheral surface of the platen roller, and a paper pan formed on the paper pan. The present invention relates to a recording apparatus in which a recording sheet is conveyed by a recording sheet conveyance mechanism having a feed roller that presses the recording sheet against the outer peripheral surface of a platen roller through an opening.

[Prior Art J] Figure 2 shows a typewriter as an example of this type of recording device. In this typewriter, a carriage l carrying a recording head 7, an ink ribbon cassette 2, etc. runs along a platen roller 3, and the recording head 7 is driven to perform recording on a recording sheet (not shown) on the platen roller 3''. It looks like this.

The conventional configuration of a paper feeding system around a platen roller 3 for feeding a recording sheet, that is, a recording paper, is shown in FIGS. 3(A) to 3(D). A paper pan 5 is provided near the bottom of the platen roller 3 to guide the recording paper along the outer periphery of the platen roller 3. Here, cardboard 6 such as an envelope is shown as the recording paper.

Also, near the bottom of the platen roller 3 is a front feed roller 4a that presses the recording paper against the outer peripheral surface of the platen roller 3.
and two feed rollers 4a provided with rear feed rollers 4b.

4b is supported by the paper pan 5, and is urged toward the platen roller 3 by an elastic member (not shown).
Openings 5a and 5b formed in the paper pan 5, respectively
The platen roller 3 is pressed against the outer circumferential surface of the platen roller 3 via.

Reference numeral 8 denotes a card holder provided on the front side of the carriage l, which guides the recording paper along the outer periphery of the front side of the platen 3.

Next, the operation of the paper feed system will be explained. First, to set the thick recording paper 6 on the platen roller 3, insert the leading edge of the thick paper 6 between the platen roller 3 and the rear feed roller 4b as shown in FIG. By operating the platen knob 3a, the platen roller 3 is rotated clockwise in FIG. 3(A). As a result, the cardboard 6 is fed through the paper pan 5 along the outer peripheral surface of the platen roller 3 to the positions shown in FIGS. 3(A) to 3(C), and recording is possible at the position shown in FIG. 3(C). It becomes a state.

After the cardboard 6 is set in this manner, the carriage l travels along the platen roller 3 in response to an operation on the keyboard (not shown) of the typewriter shown in FIG. 2, and the recording head 7 is driven to record on the cardboard 6. will be done. - When the recording of the line is completed, the platen roller 3 is rotated by a predetermined angle clockwise in FIG. 3(C) by the drive of a paper feed motor (not shown), the cardboard 6 is fed by a predetermined amount, and a line feed is performed.

[Problems to be Solved by the Invention] By the way, when recording on the lower part of the cardboard 6 with the configurations shown in FIGS. When the platen roller 3 stops rotating, the end of the cardboard 6 may come to a position just off the rear feed roller 4b and abut against the rear feed roller 4b, as shown in FIG. 3(D). In this case, even if the platen roller 3, which has rotated too much due to the acceleration of rotation for line feed, tries to return to its normal position after rotation, the cardboard 6 whose terminal end is in contact with the rear feed roller 4b is stretched. As a result, the platen roller 3 does not return to its normal position, resulting in a problem in that the recording position shifts.

An object of the present invention is to solve such problems.

[Means for Solving the Problems] In order to solve the above problems, a recording apparatus according to the present invention includes a platen roller, a guide for guiding a recording sheet along the outer peripheral surface of the platen roller, and a guide formed on the guide. a feed roller that presses against the outer peripheral surface of the platen roller through an opening, and the edge of the feed roller opening of the guide on the downstream side in the recording sheet forward feeding direction transfers the recording sheet to the feed roller contact portion of the outer peripheral surface of the platen roller. We adopted a structure configured in a shape that guides you in the direction.

[Function] According to such an I#I structure, when the platen roller stops rotating and the trailing edge of the recording sheet comes to a position where it just comes off the feed roller, the trailing edge of the recording sheet is moved to the feed roller of the paper pan. Since the edge of the roller opening on the downstream side in the recording sheet forward feeding direction is guided toward the feed roller contact portion on the outer circumferential surface of the platen roller, the roller does not collide with the feed roller.

[Example 1] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

Figures 1 (A) and (B) illustrate the structure and operation of the paper feeding system of the recording apparatus according to the embodiment of the present invention. Figures 3 (A) to (D) of the conventional example Parts that are common or correspond to the inside are given the same reference numerals, and a description of the common parts will be omitted.

It is assumed that this paper feeding system is provided in the typewriter shown in FIG.

As shown in FIGS. 1(A) and 1(B), in this embodiment, in the paper pan 5, the edge 5 on the downstream side in the paper feeding direction (forward feeding direction) of the opening 5b into which the rear feed roller 4b is loosely fitted.
The cross-sectional shape of c is different from the conventional example. That is, the cross-sectional shape of the edge 5C is wedge-shaped, and the corner at the tip thereof is located very close to the contact point (contact part) P between the platen roller 3 and the rear feed roller 4b, and the edge 5C in contact with the cardboard 6.
The extension surface of the upper surface of is arranged to pass through the contact point P.

According to such a structure, as shown in FIG. 1(A), the cardboard 6 is placed between the platen roller 3 and the rear feed roller 4b.
is inserted and the cardboard 6 is fed by the rotation of the platen roller 3, the edge 5 of the opening 5b of the paper pan 5
C guides the cardboard 6 toward the contact point P on the outer circumferential surface of the platen roller 3 and presses it to a portion very close to the contact point P.

When recording on the lower part of the cardboard 6, when the rotation of the platen roller 3 stops for line feed, the end of the cardboard 6 is at a position where it just comes off the rear feed roller 4b as shown in FIG. 1(B). When the platen roller 3 reaches the contact point P, the end portion of the cardboard 6 is guided by the edge portion 5c toward the contact point P on the outer peripheral surface of the platen roller 3, and is pressed very close to the contact point P.

Therefore, the end portion of the cardboard 6 does not hit the rear feed roller 4b and is stretched, and the recording position is prevented from shifting due to the tension, so that high-quality recording can be performed.

In the above configuration, the distance between the platen roller 3 and the paper pan 5 is approximately 1 mm. The upper surface of the edge 5c of the opening 5b of the paper pan 5 shown in FIG. (Angle) α is about 15° to 20°, preferably about 18° to 19°.

Further, with the above configuration, the paper pan 5 can be formed as a plastic molded product into the cross-sectional shape shown in the figure, or it can also be formed by pressing a metal plate. When forming by pressing a metal plate, bend the edge 5C of the opening 5b of the paper pan 5 at an appropriate angle so that the extended surface of the upper surface of the edge 5c passes through the contact point P, and The tip may be located very close to the contact point P.

[Effects of the Invention] As is clear from the above description, the recording apparatus according to the present invention includes a platen roller, a guide for guiding a recording sheet along the outer peripheral surface of the platen roller, and an opening formed in the guide. a feed roller that presses against the outer circumferential surface of the platen roller, and an edge of the feed roller opening of the guide on the downstream side in the recording sheet forward feeding direction guides the recording sheet toward the feed roller contact portion on the platen roller outer circumferential surface. Since we adopted a structure structured in shape,
When the rotating ring of the platen roller reaches a position where the end of the recording sheet just comes off the feed roller, the end of the recording sheet is guided toward the contact area of the feed roller on the outer peripheral surface of the platen roller, so that it does not hit the feed roller. This provides an excellent effect of preventing the recording position from shifting due to the tension of the recording sheet.

[Brief explanation of drawings]

Figures 1 (A) and (B) are explanatory diagrams showing the structure and operation of the paper feed system of a typewriter according to an embodiment of the present invention, respectively, and Figure 2 is an illustration of the hood of the typewriter equipped with the paper feed system opened. Perspective views showing the appearance of the state, Figures 3 (A) to (D)
are explanatory diagrams showing the structure and operation of the paper feed system of a conventional typewriter, respectively, and FIG. 4 is an explanation of the angle of the edge 5c of the opening 5b of the paper pan 5 in FIGS. 1(A) and (B). It is a diagram. l...-Carriage 2--Ink ribbon cassette 3--Platen roller 4a...Front feed roller 4b...Rear feed roller

Claims (1)

[Claims] 1) It has a platen roller, a guide that guides the recording sheet along the outer circumferential surface of the platen roller, and a feed roller that presses against the outer circumferential surface of the platen roller through an opening formed in the guide. 1. A recording apparatus, wherein an edge of the feed roller opening on the downstream side in the recording sheet forward feeding direction is configured to guide the recording sheet toward the feed roller contact portion on the outer peripheral surface of the platen roller.