JPS63242572A - 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] Purpose of the Invention (Field of Industrial Application) The present invention includes a platen and a print head that is arranged opposite to the platen and prints on paper at a printing position on the platen. It is related to printers.

(Prior Art) In order to prevent thick printing paper such as postcards from bending, the inventor has developed a method to prevent the printing position from being misaligned between the top and bottom layers of paper when printing on multiple sheets of stacked slip paper. First, place the feeding roller and the pulling roller in front and behind the tangential direction of the printing position on the platen to avoid
He devised a printer that transports printing paper almost in a straight line.

Additionally, in general, printers are required to start printing as close as possible to the leading edge of the printing paper, and to ensure the transfer of the printing paper, and to hold the printing paper as close to the printing position as possible to prevent it from floating off the platen. There is a demand for it.

(Problem to be Solved by the Invention) For this reason, in this type of printer, the upper part of the printing position on the platen is blocked by a pair of drawer rows, and the connection between the platen and the print head is A new problem has arisen in that it is extremely difficult to repair a paper jam when it occurs, to attach and detach the print head when repairing or replacing it, or to replace the ink ribbon.

Structure of the Invention (Means for Solving the Problems) The present invention has been made in order to solve the above-mentioned problems. Each of the rollers is rotatable on its own axis, and one of the pair of rollers on the print head side is configured to revolve around the axis of the other roller.

(Function) Therefore, according to the printer of the present invention, one roller on the print head side of a pair of O-rollers for drawing out paper is made to revolve around the axis of the other roller, and the printing position on the platen is adjusted. The upper part can be opened, making it easy to perform repair operations when a paper jam occurs between the platen and print head, attachment/detachment operations when repairing or replacing the print head, or replacing the ink ribbon. Can be done.

(Embodiment) Hereinafter, an embodiment of a printer embodying the present invention will be described in detail 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 other side. The constituent tractor units 5 are each housed therein. The unit frame 6 of the printing mechanism unit 4 is constructed by installing one wooden hollow construction bar 8 and two wooden round guide bars 9 and 10 between a pair of left and right side plates 7. , 10, a cylindrical platen 11 is rotatably supported between both side plates 7.

The carriage 12 is supported by the guide bar 9.10 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 diagonally from 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 the inside of the ink ribbon cassette 14 is transferred along the position facing the printing head 13 on the platen 11, that is, along the printing position. Ru. Then, while the carriage 12 is moved in the left-right direction, printing is performed on the printing paper via the ribbon 15 by the print head 13 at a printing position on the platen 11.

Each pair of feed rollers 16, 17, 18, and 19 are arranged approximately tangentially to the printing position on the platen 11, before and after the paper feed direction, and when a motor (not shown) is rotated, a gear mechanism The feed rollers 16, 17, 18, and 19 are rotated together with the platen 11 in the paper feeding direction via rollers (not shown) to transport the printing paper while holding it there. The passage forming member 20 and the guide member 30 are arranged so as to substantially sandwich the tangent line of the platen 11, and the passage forming member 20, the guide member 30, and the eight feed rollers 16 to 19 form the paper guide passage 21 passing through the printing position Vt. It is formed.

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 units 1 to 5 are composed of a guide shaft 22 and a transmission shaft 23 extending 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 arranged in an inclined state on the upstream side of the paper guide passage 21 in the paper feeding direction and substantially in the same plane as the passage. The bin tractor 24 has a structure in which a belt with pins is stretched around a pair of pulleys supported by both shafts 22 and 23, similar to a conventional device of the same type. Then, the feed holes provided on both sides of the continuous printing paper are fitted into the bins of both bin tractors 24, and the transmission shaft 23 is rotated by the rotation of a motor (not shown), and the bin tractor 24 is rotated. , 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, a single sheet of printing paper is introduced and guided into the paper guide path 21 in one operation. Pair of left and right opening interior boards 2
7 is 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 plate 27.

Next, to explain in detail the support structure of the feed rollers 18 and 19 for drawing out the paper provided above the printing position of the platen 11, as shown in FIGS. . Engagement protrusions 34 are formed between the bosses 32 and 33, respectively.

The shaft 18 of the upward feed roller 18 on the platen 11 side
Both ends of the upper boss 32 are inserted into and supported by the elongated holes 32a of the upper boss 32 so as to be rotatable and slightly movable, and the position of the upper feed roller 18 relative to the lower feed roller 19 is operated so as to be able to approach and separate from the lower feed roller 19 by an operating mechanism (not shown), thereby printing on both rollers. The clamping pressure on the paper can be adjusted.

The downward feed roller 19 on the side of the print head 13 is made of a single hollow round bar, with gears 38 fixed to both ends thereof.
It is rotatably supported on the outer periphery of Ikl 119a that passes through the center of the roller 19. Both ends of the shaft 19a are connected to the lower boss 3
It is fixedly supported in the hole 33a of No. 3 in a non-rotatable manner. Tooth width 3
8 meshes with a gear 37 fixed to the shaft end of the feed roller 18, and the rough gear 37 meshes with a centering mechanism 1ll) 939 connected from a drive source such as a motor, and both rollers 18, 19
Both are driven at the same time.

On the other hand, the inner surfaces of the side plates 7 of the printing unit frame 6 have an arcuate recess 35 for rotatably supporting the upper boss 32 of the arm 31, and a removable engagement with the engagement protrusion 34 of the arm 31. A retaining pawl 36 is formed. Then, as shown in FIG.
Both feed rollers 18 and 19 are rotatably mounted between the side plates 7 by engaging the engagement projections 34 with the locking claws 36.

Therefore, in the installed state shown by the solid line in FIG.
The arm 31 is rotated around the upper boss 32 in the arcuate recess 35, as shown by the chain line in the figure.
The lower feed row 519 revolves around the axis of the upper feed roller 18, and the upper part of the printing position on the platen 11 is opened. For this reason, the print head can be easily repaired when a paper jam occurs between the platen 11 and the print head 13, when the print head 13 is repaired or replaced, or when the ink ribbon is replaced. This can be easily done without being obstructed by the downward feed roller 19 for drawing out the paper located on the 13 side.

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 (reduced) without departing from the spirit of the invention.

Effects of the Invention As detailed above, according to the present invention, of a pair of paper drawing rollers, the -h roller on the print head side revolves around the axis of the other roller to adjust the printing position on the platen. The top can be opened, making it easy to repair paper jams between the platen and print head, attach/detach the print head when repairing or replacing it, or replace the ink ribbon. Qin can have an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of a printer embodying the present invention, FIG. 2 is a partial plan view showing a support structure for a feed roller for drawing out paper, and FIG. 3 is a part of the same structure. The exploded perspective view and FIG. 4 are also partially sectional side views. 11...Platen, 13...Print head, 18.1
9... Feed roller for paper drawer, 31... Arm.

Claims (1)

[Claims] 1. A printer equipped with a platen (11) and a print head (13) that is arranged opposite to the platen (11) and prints on paper at a printing position on the platen (11). A pair of paper drawer rollers (18, 19) are each rotatably provided above the printing position on the platen (11), and of the pair of rollers (18, 19), the print head (13) side is provided. One roller (19) of the other roller (1
8) A printer characterized in that it is configured to be able to revolve around an axis. 2. The shaft of the one roller (19) is supported between the free ends of a pair of arms (31) rotatably supported at both ends of the shaft of the other roller (18). The printer according to paragraph 1.