JPS63242573A - printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention Object of the Invention (Industrial Application Field) The present invention includes a platen and a print head disposed opposite to the platen, and the print head prints a sheet of paper at a printing position on the platen. The present invention relates to a printer that prints on paper.

(Prior art) Conventional printers of this type are designed to avoid bending thick printing paper such as postcards, and when printing on multiple sheets of stacked slip paper, the printing position is adjusted between the top and bottom layers of paper. In order to prevent misalignment, a pair of feed rollers are placed in front and behind the printing position on the platen in the paper feeding direction to clamp and transport the paper. The printing position of the platen exists on a straight line connecting the two, and the paper is linearly transported through the printing position on the platen as the feed roller operates.

(Problems to be Solved by the Invention) Therefore, in this conventional printer, when the paper is transported, it tends to float from the printing position on the platen and become curly, and in this floating state, the print head prints (j
However, there was a problem that a large printing noise was generated. Structure of the Invention (Means for Solving the Problem) This invention was made by focusing on the problem as described above. A pair of feed rollers are arranged before and after the mark 1' position in the paper feed direction to grip and transport the paper, respectively, and the rollers are placed above the platen above the straight line connecting the two feed rollers before and after the paper feed rollers. Set the printing position to tf1!
ll[! A configuration is adopted in which the print head is placed slightly close to the print head.

(Function) Therefore, according to the printer of the present invention, the paper is transported in a state where it is always in contact with the printing position on the platen without causing any lifting, and printing noise due to the lifting state of the paper is prevented, so that the paper can be transported quietly. Can print.

(Embodiment) An embodiment of a printer embodying the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the printer case 1 consists of an upper case 2 and a lower case 3 assembled together at the center, with a printing mechanism unit 4 on one side and a tractor means on the sacral side. Configure!・Each unit 5 is housed therein. The unit frame 6 of the printing mechanism unit 4 is constructed by installing one hollow installation bar 8 and two wooden round guide bars 9 and 10 between a pair of left and right side plates 1. .10, a cylindrical platen 11 is rotatably supported between both side plates 7.

The carriage 12 is supported by the guide bars 9 and 10 so as to be movable in the left-right direction, and a print head 13 is mounted on the upper part of the carriage 12 so as to face the platen 11 from diagonally below. The ribbon cassette 14 is arranged between the both side plates 7 of the printing unit frame 6, and a part of the ink ribbon 15 pulled out from inside the ribbon cassette 14 is placed at a position 1° opposite the printing head 13 on the platen 11, that is, along the printing position. be transported. Then, while the Kittridge 12 is moved in the left and right direction,
Print position 71.1 on platen 11 by print head 13
Then, printing is performed on the printing paper via the ribbon 15.

Each pair of feed rollers 16, 17, 18, and 19 are arranged approximately tangentially to the printing position on the platen 11, and are arranged at the front and rear of the paper feeding direction, and when a motor (not shown) is rotated, the gears are The feed rollers 16, 17, 18, 19 are rotated together with the platen 11 in the paper feeding direction via M4 (not shown), so that the printing paper is transferred while being held therein. The passage forming member 20 and the guide member 31 are arranged so as to substantially sandwich the tangent line of the platen 11, and the passage forming part 4120 and the guide member 31
A paper guide path 21 passing through the printing position is formed by the multi-feed rollers 16 to 19.

Further, the paper guide path 21 is substantially flat and has an inclined state in which the introduction side to the printing position is located lower than the discharge side.

The tractor unit 5 is composed of a guide shaft 22 and a transmission shaft 23 that extend in parallel in the left-right direction, and a pair of left and right bin tractors 24 supported by both shafts 22 and 23 so as to be movable and adjustable in the width direction of the paper. The upper surface of the bin tractor 24 is disposed on the upstream side of the paper guide passage 21 in the six paper feeding direction in an inclined state within a substantially circumferential plane of the passage. The bin tractor 24, like other devices of the same type,
It has a structure in which a belt with pins is extended around a pair of pulleys supported by both wheels 22 and 23. Then, feeding holes provided on both sides of the 3If-print paper are fitted into the bins of both bin tractors 24, and a motor (U shown in the figure) is inserted into the bins.

By rotating the transmission shaft 23 and the pin 1 heractor 24, continuous printing paper is introduced and guided into the paper guide path 21.

A manual feed guide plate 25 constituting a guide means is supported between both side plates 7 of the printing unit frame 6 above the tractor unit 5, and extends substantially horizontally on the upper surface thereof and is provided at a predetermined angle with respect to the paper guide path 21. Intersecting guide surfaces 26 are formed. Then, along the guide surface 26 of the guide plate 25, the sheet IIi printing paper is manually introduced into the paper guide path 21 into the kiln. A pair of left and right opening inner plates 27 are mounted on the guide plate 25 so as to be movable in a direction perpendicular to the paper feeding direction, and both side edges of the printing paper are guided and regulated by engagement with the opening inner plates 27.

As shown in FIG. 1, the guide member 31 is arranged between the side plates 7 of the printing unit frame 6 in the vicinity of the platen 11, and an opening 32 is formed in a portion of the platen 111 corresponding to the printing position. At the same time, a plurality of through holes 33 and recesses 34 are formed in a portion corresponding to the feed roller 16, 18 located above. A guide surface 39 is formed on the lower surface of the guide member 31 so as to extend substantially tangentially to the platen 11, and defines an upper part of the paper guide path 21.

The passage forming member 20 is made of an elastic plate, and is fixed to the construction bar 8 at its end on the −L side in the paper feed direction, and its other end is in close proximity to or in elastic contact with the outer periphery of the platen in front of the printing position. The passage forming portion If20 has a through hole 20a in a portion corresponding to the feed row 517, and brings the feed rollers 16 and 17 into contact with each other.

Next, the arrangement of the printing position on the platen 11 will be described in detail. In this embodiment, as shown in FIG. It is arranged slightly closer to the print head 13 side than the straight line connecting between the feed rollers 16 and 17 on the side and the feed rollers 18 and 19 on the output side of υ1. However, the extension line of the tangent between the feed row 516.17fN on the introduction side and the platen 11 intersects the arcuate surface of the lower roller 19 on the discharge side opposite the upper roller 18, so that the leading edge of the printing paper Feed row 518 on the discharge side.
There is no problem in being held by 19. Therefore, in this printer, the continuous printing paper introduced from the tractor unit 5 and the cut printing paper introduced from the manual feed guide plate 25 come into close contact with the printing position of the platen 11, and the paper guide path 21 The paper is always conveyed in contact with the printing on the platen 11 without any lifting, and the printing noise caused by the lifting of the paper is also reduced.
Printing can be done very quietly.

[In the embodiment described above, the feed speed of the discharge side rollers 18 and 19 may be set slightly faster than that of the introduction side rollers 16 and 17.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed and embodied without departing from the spirit of the invention.

Effects of the Invention As detailed above, according to the present invention, the paper is transported in a state where it is always in contact with the printing position on the platen without causing any lifting, thereby preventing printing noise due to the lifting state of the paper. It has an excellent effect of being able to print quietly.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a printer embodying the present invention. AI! The cross-sectional view and FIG. 2 are schematic configuration diagrams for explaining the relative arrangement of the feed roller and the platen. 11...Platen, 13...Print head, 16-1
9...Feed roller.

Claims (1)

[Claims] 1. A platen (11) and a print head (13) disposed opposite to the platen (11), wherein the print head (13) prints at a printing position on the platen (11). In a printer configured to print on paper, a pair of feed rollers (16, 17) (18, 19) are provided for holding and transporting the paper before and after the printing position, respectively, in the feeding direction of the paper. ), and the printing position on the platen (11) was made slightly closer to the print head (13) than the straight line connecting both the front and rear feed rollers (16, 17) (18, 19). A printer characterized by: 2. The printer according to claim 1, wherein the platen (11) is cylindrical and rotates in the paper feeding direction together with the feeding rollers (16, 17) (18, 19).