JPS61121972A - Platen structure - Google Patents

Abstract

PURPOSE:To form a desired flat recording surface by one feed roller, by combining a feed roller, of which the roller part is intermittently lacked, with the platen blocks arranged to the lacked parts of the feed roller. CONSTITUTION:Platen blocks 6 are arranged to the roller lacked parts of a feed roller 1, that is, between roller parts 3, 3 adjacent to each other and assembled in predetermined positional relation not contacted with the feed roller 1. The guide surface 12 of each platen block 6 is formed as a flat surface or gentle curved surface continued to the contact surface of each roller part 3 and forms a flat or almost flat recording surface at the part of a printing head 9. After printing, paper 8 is discharged while guided to the direction shown by the arrow along the platen blocks 6 by utilizing the feed force of the feed roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a platen structure used in a recording device or the like, and particularly to a platen structure that also has a paper feeding function.

[Prior art]

2. Description of the Related Art Recording devices such as printers and facsimile machines require a platen unit that faces a print head and backs up the paper, and a paper feed unit that feeds the paper at a predetermined pitch.

As a structure for realizing these means, first, a platen roller (feed roller) with a round cross section is used. However, this platen roller serves both as a platen means and a paper feeding means, and although it is advantageous in that it has a simple structure, it is not possible to obtain a flat recording surface because the recording surface is formed on the peripheral surface of the roller. However, there is a problem in that it is difficult to ensure sufficient print quality.

To solve this problem, the platen structure uses two rollers installed in parallel to feed the paper.
A device that forms a flat recording surface between book rollers has been proposed. However, since this method uses two rollers, there are problems in that the required space is large and the cost is high.

〔the purpose〕

The purpose of the present invention is to solve the problems of the prior art, to form a flat recording surface with a single feed roller, to omit the paper pail that guides paper ejection, and to save space. - To provide a platen structure capable of reducing space and cost.

[Summary]

The present invention achieves the above object by combining a feed roller whose roller portion is intermittently cut out and a platen block arranged in the cut-out portion of the feed roller.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an exploded platen structure according to an embodiment,
A feed roller 1 for feeding paper is composed of a roller shaft 2 and an intermittently removed roller portion 3. Each roller portion 3 can be made of rubber with a predetermined hardness, and is fixed to a roller shaft 2, and is driven to rotate in the direction of the arrow by a gear 4 fixed to the end of the roller shaft by a motor or the like.

Note that rotatable cylindrical bearing members 5 are provided on both sides of the roller shaft 2.
are fitted.

A platen block 6 is arranged between the roller portions 3, 3 of the feed roller 1, that is, adjacent roller portions 3, 3. These plurality (four in the case of illustration) of platen blocks 6 are fixed to a common bracket 7 in a predetermined arrangement.
By fitting the fitting grooves 7A, 7A formed on both sides of the bracket into the surface of the cylindrical bearing member 50, and fixing the projecting portions 7B, 7B on both sides of the bracket to the main body of the apparatus, as shown in FIGS. As shown in the figure, feed roller 1
It is assembled in a predetermined positional relationship that does not touch the

FIG. 2 shows a cross section of the roller section 3 between adjacent platen blocks 6.6, and FIG. 3 shows a cross section of the platen block 6 between adjacent roller sections 3, 3 (roller missing section).

In FIGS. 2 and 3, paper 8 is fed by the feed roller 1 in the direction of the arrow, a print head 9. Paper guide means consisting of a paper pan 10 and a pair of pressure rollers 11.degree. 11 disposed along the circumferential surface of the feed roller 1 are indicated by two-dot chain lines, respectively.

As shown in FIG. 3, each platen block 6 is located in the middle of the road, excluding the paper guide section of the roller section 3, and transfers the paper 8 sent by the feed roller 1 to the print area (facing the print head 9). It is configured to guide at the downstream side (the upper side in the drawing).

Therefore, the guide surface 12 of each grating block 6 is formed of a flat surface or a gently curved surface that is continuous with the contact surface of the roller section 3.
The print head 9 has a shape that provides a flat recording surface or a flat recording surface close to the y-plane.

Therefore, the paper 8 that has been sent along the circumferential surface of the feed roller 1 to the vicinity of the print head 9 is then moved in the direction of the arrow along the platen block 6 using the feeding force of the feed roller. It is ejected while being guided by.

According to the platen structure described above, by making the guide surface 12 of the platen block 6 flat, a desired flat recording surface can be easily obtained. In this way, 1
A flat recording surface can be formed freely by simply using the book feed roller 1, and compared to the conventional two-roller type, a platen structure with a flat recording surface that can be used for paper feeding is obtained in a smaller space and at a lower cost. be able to.

In addition, since only one feed roller 1 is used, the roller diameter can be designed to be large at the same time as saving one space.The bending radius of the paper 8 is increased, so even thick and stiff paper can be used. Paper can be fed smoothly and with high pitch accuracy.

Furthermore, since the guide surface 8 of the platen block 6 can guide the ejection of the paper, the paper pail mechanism can be omitted and costs can be reduced.

In the above embodiment, the case where the present invention is applied to a recording device has been explained, but the present invention can be similarly applied to a platen structure for document feeding in a reading device that uses an image reading head instead of the print head 9. It can be applied to

Further, in the structure of the present invention, since the sheet 8 is not in close contact with the guide surface 12 of the platen block 6 throughout the entire area in the middle direction, it is preferably applied to a non-impact type recording apparatus such as an inkjet recording type.

〔effect〕

As is clear from the above description, according to the present invention, it is possible to obtain a platen structure that can also be used to feed paper and which can form a desired flat recording surface with a single feeding roller.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a platen structure according to one embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views of a roller portion and a platen block portion of the platen structure of FIG. 1. 1...Feed roller, 3...Roller part, 6...
...Platen block, 8...Paper, 9...
...Print head. Agent Patent Attorney Yasushi Ooto Figure 1 Figure 2 ++' 10 Figure 3

Claims (1)

[Claims] (1) A feed roller with a roller portion intermittently cut out and a platen block placed in the cutout portion of the feed roller are provided, and the paper fed along the feed roller is controlled by the feeding force of the feed roller. A platen structure configured to be used and discharged along a platen block.