JPS5935406Y2 - Printer paper tension adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a printing paper tension adjusting device for a printer.

2. Description of the Related Art Printers that print desired characters, numbers, symbols, etc. on printing paper are well known and are widely used as input/output devices for electronic desktop calculators and information equipment.

There are various formats of printing paper used in this type of printer, but roll paper is generally used, and the roll paper is fed toward the platen by one side of a bin tractor, and the printed paper is is pulled from the platen by the opposite side of the bin tractor.

In this way, in printers that print while holding the printing paper closely against the platen, it is necessary to always give the printing paper the optimum tension. A tension adjustment device was provided.

Therefore, the conventional device has disadvantages such as a complicated structure, an increase in the size of the device, and an increase in price.

Further, in the conventional apparatus, when the paper is fed in the reverse direction, the tension adjustment spring is deformed and the amount of paper feed is disturbed, so that it is actually difficult to feed the paper in the reverse direction.

The present invention was devised in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide an improved printing paper tension adjusting device that can reliably obtain a desired tension with a simple structure.

In order to achieve the above object distantly, the present invention includes a platen, a bin tractor for feeding printing paper toward the platen and pulling out the printed printing paper from the platen, and a printing paper fed from the bin tractor toward the platen. In the printer, the guide device includes a paper guide plate arranged around the outer periphery of the platen and rotatable around the platen axis, and a tension force applied from a tail end extending from the paper guide plate. When the printing paper is attached, the paper guide plate is moved to the printing paper guide position and the tension piece is driven to the retracted position. On the other hand, after the printing paper is attached, the paper guide plate is retracted from the running position of the print head, and the tension piece is used for printing. and a drive device for moving the paper to an entry position where the paper is stretched.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment in which the printing paper tension adjustment device according to the present invention is applied to a dot printer, in which printing paper 14 is held tightly around a platen 12 rotatably supported on a platen shaft 10. A desired printing operation is performed by a print head 16 disposed near the platen 12.

Although the print head 16 is not shown, as is well known, a plurality of print pins are built inside the print head 16, and by controlling the desired print pins to protrude while moving the print head 16 in parallel to the axial direction of the platen 12. , any characters can be printed.

Note that the print head 16 transfers the print paper 14 to the platen 12.
When mounting the printing paper on the paper, it can be retracted to the outside of the platen 12, making it possible to easily carry out the printing paper mounting operation described later.

In the embodiment, the printing paper 14 is made of roll paper,
The printing paper 14 is sent out toward the platen 12 by the lower side of the pin tractor 18, and the printed paper 14 is pulled out from the platen 12 from the upper side of the bin tractor 18.

That is, the bin tractor 18 has a configuration in which a plurality of pins 24 are arranged at equal intervals on both sides of a belt 22 that is rotationally driven by a drive pulley 20, and a plurality of pins 24 are arranged on both sides of the stamp paper 14. The printing paper 14 can be forcibly fed and driven in the direction indicated by the arrow by engaging with the feed hole provided therein.

Guide plates 26 are provided on both sides of the bin tractor 18, and the printing paper 14 is held between the bin tractor 18 and the guide plates 26 and driven to be fed in a predetermined direction.

A characteristic feature of the present invention is that a platen shaft 1 is provided on the outer periphery of the platen 12 with a gap through which the printing paper 14 can pass.
A paper guide plate 28 is provided, which is rotatable around 0.
Further, the extended tail end of this paper guide plate 28 is a tension piece 30.
It is the formation of

In the embodiment, the tension piece 30 is formed integrally with the paper guide plate 28, but in the present invention, the tension piece 30 can also be formed from a separate member fixed to the tail end of the paper guide plate 28. It is.

The paper guide plate 28 is made of a substantially arc-shaped thin plate along the outer periphery of the platen 12. Therefore, when the printing paper 14 is sent out from the bin tractor 18, it is guided into the gap between the platen 12 and the paper guide plate 28 and passes through the platen. 12 is properly installed on the outer periphery.

The aforementioned guide plate 28 is rotatably supported by the platen shaft 10, and in order to rotate this paper guide plate 28, a drive mechanism that is housed in a cam mechanism is provided in the embodiment.

The drive mechanism includes a tension adjustment lever 34 supported by a shaft 32, and an engagement pin 3 provided at one end of the tension adjustment lever 34.
6 engages with the tension piece 3o, and the other end of the lever 34 engages with the cam 3.
It is in contact with the outer periphery of 8.

The cam 38 is fixed to a rotary operation plate 40 and can rotate around a shaft 42, and in the embodiment, the rotary operation plate 4
However, in the present invention, the cam 38 can be rotated manually or automatically using another operating lever. It is also possible to manipulate.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

FIG. 1 shows the state in which the printing paper is installed. In this state, by rotating the tension adjustment lever 34 in the counterclockwise direction, the paper guide plate 2
8 is rotated clockwise and positioned at the printing paper guide position.

At this printing paper guide position, the tip 28 of the paper guide plate 28
a is rotated to the printing position with the print head 16 of the platen 12, and as a result, the platen 1 of the print paper 14
2 can be securely attached.

When the printing paper is attached, the tension piece 30 is attached to the first
As is clear from the figure, since the area in which the printing paper 14 is stretched from the bin tractor 18 toward the platen 12 is retracted, there is no problem in unwinding the printing paper 14.

FIG. 2 shows the tension adjustment state after the printing paper 14 is installed, and the printing paper 14 is pulled out to the upper side of the bin tractor 18, and in this state, the tension adjustment lever 34 is rotated clockwise. This causes the paper guide plate 28 to rotate counterclockwise.

Therefore, the tip 28a of the paper guide plate 28 is retracted from the printing position, allowing the print head 16 to perform a reliable printing operation, and the tension piece 30 is placed in the tension area of the printing paper 14 from the punch tractor 18 toward the platen 12. It is possible to enter the printing paper 14 and apply a certain tension to the printing paper 14.

The tension at this time can be arbitrarily set by the amount of rotation of the rotary operation plate 40, and it is possible to provide the optimum tension depending on the paper thickness and other factors.

As described above, it is possible to obtain a desired tension on the printing paper 14, whose feeding and drawing side positions are regulated by the bin tractor 18, by bringing the tension piece 30 into contact with the printing paper 14.

Although a dot printer is shown in the embodiment, it is also possible to apply the present invention to any other printer such as a flying type printer or other line printer.

As explained above, according to the present invention, the tension of the printing paper can be adjusted arbitrarily by the tensioning piece provided on a part of the paper guide plate, and the structure is simple and the printing is small and low-cost with less trouble. It becomes possible to obtain a paper tension adjustment device, and it also becomes possible to feed the paper in the opposite direction.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a preferred embodiment of the printing paper tension adjustment device according to the present invention, and FIG. 2 is an explanatory diagram of main parts showing the tension adjustment state in FIG. 1. DESCRIPTION OF SYMBOLS 10...Platen shaft, 12...Platen, 14...Print paper, 18...Bin tractor, 28...Paper guide plate 30・・・・・・
・Tension pressure piece, 34...Tension adjustment cover, 38...
...Cam, 40...Rotary operation board.

Claims (1)

[Scope of utility model registration request] A printer including a platen, a bin tractor that sends printing paper toward the platen and pulls printed printing paper from the platen, and a guide device that guides the printing paper sent from the bin tractor toward the platen. The device consists of a paper guide plate arranged around the outer periphery of the platen and rotatable around the platen axis, a tension piece consisting of a tail end extending from the paper guide plate, and a tension piece that guides the paper guide plate when printing paper is attached. position, and drives the tension piece to a retracted position, while after the printing paper is attached, drives the paper guide plate away from the print head running position and moves the tension piece to an entry position where the printing paper is stretched. A printing paper tension adjustment device for a printer, characterized in that it is contained in a printer.