JP2779302B2 - Printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for performing printing using roll paper.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional configuration of a printing apparatus for performing printing using roll paper without a core. In FIG. 1, reference numeral 1 denotes an apparatus main body, and a roll paper P without a core is housed in a paper housing section 2 so as to be drawn out. The apparatus body 1 also includes a printing unit (platen 3, print head 4),
A sheet conveying means, a stationary guide member 9 (9a), a movable guide member 11, a sheet conveying path 7, and the like are provided.

Here, the paper transport means is a means for feeding the roll paper P without a core to the printing units (3, 4), and includes a drive motor 5 for rotating the platen 3 in the direction of the arrow and each gear. 6a, 6b, 6c and the like. The paper transport path 7 is a means for guiding the drawn-out portion P1 of the roll paper P without the core to the printing portions (3, 4), and is formed between the upper guide portion 8a and the lower guide portion 8b. Further, the stationary guide member 9 is fixedly provided at the entrance of the paper transport path 7, and a guide roller 9 a forming a paper introduction portion is provided above the stationary guide member 9 at the paper insertion opening 7 a of the paper transport path 7. The roll paper P is rotatably supported so as to be able to be guided.

Further, the movable guide member 11 is provided so as to be pressed against the guide roller 9a of the stationary guide member 9 with a predetermined pressing force by utilizing a spring force or the like. The movable guide member 11 feeds the roll paper P to the guide rollers 9.
It plays the role of pressing and stretching to stretch out the curl.

Accordingly, the roll paper P without a core passes through the guide roller 9a and the movable guide member 11, and is inserted into the paper transport path 7 with the curl removed.
The paper is conveyed to the printing section (3, 4) by the paper transport means (5, 6a, 6b, 6c) and printed by the print head 4. Usually, after printing, a cutter device (not shown)
As a result, the roll paper P is cut.

[0006]

In the above-described conventional printing apparatus, when the remaining amount of the roll paper P decreases, the end of the roll paper P curls between the movable guide member 11 and the guide roller 9a. A phenomenon that the paper enters the inside as it is occurs, and as a result, a paper jam may occur. In particular, the frequency of occurrence increases when the end of the roll paper is flat. When such a situation occurs, printing must be interrupted to perform jam processing, and the efficiency of the printing operation will be significantly reduced.

In view of the above circumstances, an object of the present invention is to provide a printing apparatus capable of smoothly feeding and printing roll paper without causing a jam to the end.

[0008]

According to the analysis, when the roll paper approaches the terminal end, the whole paper becomes lighter and rises from the paper storage part, and comes into direct contact with the leading end of the movable guide member and the paper introduction part (guide roller). I will. In addition, since the entire end portion is often flat as a whole, it rotates at the sheet introduction section each time the sheet is fed. Here, the fact that the rotational force of the end portion jumps up the movable guide member against the pressing force, and the end portion of the roll paper is unraveled in a bamboo-like shape in the paper width direction, that is, on one side or both sides. Paying attention to the fact that it is easy to occur, the present invention is configured to prevent the rotation force from being directly applied to the movable guide member while admitting that the end portion of the roll paper rotates,
The above objective is achieved.

That is, the printing apparatus according to the present invention has a stationary guide member and a movable guide member pressed against the paper introduction portion of the stationary guide member with a predetermined pressing force, and passes between the two guide members. In a printing device formed so that the leading end is sequentially pulled out and fed to the printing unit,
A pair of rotational forces that abut on the outer peripheral surface of the trailing end portion of the fed roll paper and prevent the rotational force of the trailing end portion from being directly applied to the movable guide member, on the upstream side of the paper introduction portion of the stationary guide member. It is characterized in that an additional blocking portion is provided.

[0010]

In the case of the present invention having the above construction, when the roll paper approaches the end, the whole rolls up and loosens in the width direction like a bamboo shoot. In addition, it is often a flat shape as a whole. However, this end portion abuts on one or both of the rotational force adding preventing portions on the upstream side of the paper introducing portion.

Therefore, even if the terminal end portion rotates while contacting and engaging with the rotational force addition preventing portion as the sheet is fed, the rotational force can be prevented from being directly applied to the movable guide member. . That is, it is possible to prevent the movable guide member from being jumped up by the rotational force of the terminal end portion.

Therefore, it is possible to prevent a situation in which the end portion of the roll paper is caught between the movable guide member and the paper introduction portion in a curled state and enters the interior as it is. The paper can be smoothly fed to the printing unit without causing paper jam or the like.

[0013]

An embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the printing apparatus according to the present embodiment has the same basic configuration as that of the conventional example (FIG. 5), and is provided on the upstream side of the paper introduction section (guide roller 9 a) of the stationary guide member 9. A pair of rotational force addition preventing portions 21 and 21 are provided, and the end portion (P2) of the roll paper P is moved by the rotational force to the movable guide member 11.
Is formed so as to be prevented from jumping up, and can be fed smoothly without causing a paper jam to the end.

Note that the same components as those in the conventional example (FIG. 5) are denoted by the same reference numerals, and description thereof will be omitted or simplified.

The rotational force addition preventing portions 21 and 21 which are a characteristic portion of the printing apparatus are provided at the upstream end of the stationary guide member 9 with respect to the paper introduction portion (guide roller 9a), and the end portion P2 ( It protrudes from the outer peripheral surface of P3) so that it can abut. The rotation force addition preventing sections 21 and 21
Abuts on the end portion P2 (specifically, bamboo shoot shape portion P3) of
This prevents the rotational force of the flat end portion P2 from being directly applied to the movable guide member 11.

In this embodiment, the rotational force addition preventing section 2
The dimension between the insides of the rolls 1 and 21 is formed to be slightly larger than the width dimension of the maximum roll paper P. Further, it is molded integrally with the stationary guide member 9.

As shown in FIG. 2, the movable guide member 11 has its base end rotatably supported above the upper guide portion 8a, and is pressed against the guide roller 9a by a spring 15. A claw portion 11a is provided at the tip of the movable guide member 11, and serves to remove the curl by pressing the roll paper P against the guide roller 9a.

In FIG. 2, reference numeral 5 denotes a cutting device.

Next, the operation of the present embodiment will be described.
During normal paper feeding, the roll paper P is stored in the paper storage unit 2 shown in FIG. 2, so that the roll paper P is smoothly fed as shown in FIG. At this time, the rotational force addition preventing portions 21 and 21 on the upstream side of the guide roller 9a do not participate. However, the side surfaces of the rotational force addition preventing portions 21 and 21 can exert a position regulating function in the sheet width direction.

The roll paper P is moved to the end portion P shown in FIGS.
As the distance approaches 2, the entire body becomes lighter, and thus floats upward as shown in FIG. In this state, since the remaining number of turns is small, for example, as shown by P3 in FIG. Further, as a whole, it has a flat shape as shown in FIG.

Accordingly, as the sheet feeding progresses, the outer peripheral surface of the end portion P2 (P3) comes into contact with the left-hand rotational force preventing portion 21 as shown in FIG.
To rotate clockwise. However, since the rotational force addition preventing portion 21 is provided upstream of the paper introduction portion (9a), that is, the front end portion 11a of the movable guide member 11, the rotational force of the terminal end portion P2 (P3) is directly applied to the movable guide member. 11 (1
It is not added to 1a).

Therefore, it is possible to prevent the movable guide member 11 (11a) from jumping upward due to the rotational force of the terminal end portion P2 (P3). (9a) can be completely prevented from being caught.

[0023]

According to the present invention, on the upstream side of the paper guide portion of the stationary guide member, the rotating force of the terminal portion is directly applied to the movable guide member by contacting the outer peripheral surface of the terminal portion of the fed roll paper. The movable guide member can be prevented from being flipped up by the rotational force of the end portion because the pair of rotational force addition preventing portions is provided to prevent the movable guide member from being lifted up. Accordingly, it is possible to completely prevent the end portion from being caught between the movable guide member and the sheet introduction portion and to cause a sheet jam or the like, and it is possible to smoothly feed the sheet to the end.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining an embodiment of the present invention.

FIG. 2 is also a side view.

FIG. 3 is also a front view.

FIG. 4 is a view for explaining that rotation of the end portion of the roll paper is not directly added to the movable guide member.

FIG. 5 is a diagram illustrating a configuration of a conventional printing apparatus.

[Explanation of symbols]

 Reference Signs List 3 Platen (printing section) 4 Print head (printing section) 9 Stationary guide member 9a Guide roller (paper introduction section) 11 Movable guide member 21 Rotational force addition preventing section

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsune Hayashi 6-78, Minamimachi, Mishima-shi, Shizuoka Tokyo Electric Co., Ltd. Mishima Plant (56) References JP-A-6-247600 (JP, A) (58 ) Field surveyed (Int.Cl. ⁶ , DB name) B65H 23/00-23/34 B41J 15/04

Claims (1)

(57) [Claims] A stationary guide member, and a movable guide member pressed against a paper introduction portion of the stationary guide member with a predetermined pressing force. In the printing device formed so as to be fed to the stationary guide member, the rotational force of the end portion abuts on the outer peripheral surface of the end portion of the fed roll paper upstream of the paper introduction portion of the stationary guide member, and A printing apparatus, comprising a pair of rotation force addition prevention portions for preventing the rotation force from being directly applied to a member.