JPS592874A - Platen mechanism of printer - Google Patents

Abstract

PURPOSE:To permit the feeding of even continuous paper or slips under optimum conditions by a method in which a press roller is set at any of the first position where stronger pressure is applied to a platen, the second position where weaker pressure is applied to the platen, and the third position where they are separated from each other by operating of an operation lever. CONSTITUTION:In a printer having a dual inserter and separate insertion ports 11 and 10 for a continuous paper 1 and a single slip 7, pressing forces of a press roller 9 to give back tension to the paper 1 or the single slip 7 against a platen 4 are adjusted for either pressing or separation by turning an operation lever 20. In printing on the continuous paper 1, the press roller 9 is strongly pressed on the platen 4 at the position of the operation lever 20, whereas in printing on the single slip 7, the press roller 9 is strongly pressed on the platen 4 at the position of the operation lever 20'. In setting the continuous paper 1 or the single slip 7, the press roller 9 is separated from the platen 4 by holding the roller 9 at the position of the operation lever 20a.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The platen mechanism of the printing device according to the present invention is related to the paper feeding mechanism of a serial printer, and in particular, the platen mechanism of the printing device according to the invention is related to the paper feed mechanism of a serial printer, and in particular, the platen mechanism of the printing device according to the invention is related to the paper feed mechanism of a serial printer. -0 regarding LA (b) Conventional technology and problems Figure 1 shows a dual inserter according to the prior art.

An explanatory diagram of the platen mechanism when used. In the diagram, 1 is continuous paper,
2 is a continuous paper guide, 3 is a pressure spring, 4 is a platen, 5
6 is a print head, 6 is a continuous paper feed mechanism, and 7 is a print head. 't'Jd
8 is a ticket guide, 9 is a press opening □-RA, 10 is a ticket insertion slot, 11 is a continuous paper insertion slot, and 12 is a co-movement shaft.

The continuous paper 1 has perforations at predetermined dimensional intervals for folding and storage. The continuous paper 1 is inserted from the continuous paper insertion slot 11 and is wound around the platen 4 along the continuous paper guide 2, facing the print head 5, and then reversed and moved in the direction of arrow B by the continuous paper feed mechanism 6. Sent. It presses the platen and applies back tension to the continuous paper feed mechanism 6. Since the continuous paper 1 has creases due to perforations, if the back tension is weak, lifting occurs on the surface of the platen 4 facing the print head 5, resulting in a problem of deterioration of print quality. Therefore, the pressing force P by the suppression spring 3 is
A pressing force of 8 degrees is required when feeding continuous paper. On the other hand, when inserting the ticket 7 from the direction of the arrow A in the figure, the ticket 7 inserted from the ticket insertion slot 10 is inserted into the rotation support shaft 1.
2, the paper is sent out along the arrow CK to a position facing the print head 5. At this time, the platen 4 is pressed by the drive unit shown in the figure, and the platen 4 is rotated to eject the cut 7' from the cut insertion opening.

This configuration includes a suppression roller having a dual inserter as shown in FIG. Therefore, although each of the suppressing parts (suppressing spring, suppressing roller) has the same function, there is a drawback that each of them is configured independently.

(c) OBJECTS OF THE INVENTION It is an object of the present invention to provide a platen mechanism with dual inserters that overcomes the aforementioned drawbacks.

(d) Structure of the Invention The platen mechanism of a printing device according to the present invention that achieves the above object is a platen mechanism of a printing device that has a dual inserter with separate insertion slots for continuous paper and single sheets, and is operable. The device is characterized in that by operating a lever, the device can be positioned at a first position where it applies strong pressure, a second position where it applies weak pressure, and position 8 when it is penetrated.

(e) Examples of the invention The present invention "AkKQ" will be explained below using diagrams.

Figure 2 is a side sectional view of the platen mechanism showing an embodiment of the present invention, and Figure 3 is a diagram of the pressure roller rotation operation mechanism. 13
1 is the part still in contact with the operating lever of Ikl+14, and the other parts are the same as in FIG. 1. K is given the same number.

In FIG. 2, a suppression roller 9 is used to apply back tension to the continuous paper 1. Therefore, the first function of the pressing roller 9 is to clamp the continuous paper 1 between the platens 4 and apply pack tension when inserting the continuous paper #'1 to prevent it from floating at the position facing the print head 5. When inserting cut sheet 7 as a second function, jliM
7 is pressed against the platen 4 surface to cause the discharge to occur as the platen 4 rotates. At this time, suppression low 29
As shown in FIG. 3, the rotation position is achieved by switching the operating lever 201 into three stages using the profile of the rotation shaft 21. In other words, when the operating lever 20 is rotated to 20a along the arrow a in FIG.
At 0, which is configured to be positioned at three positions a and 20', the abutting portion 13 of the shaft 14 of the pressing row 2 is always in contact with the lower end of the operating lever 20 due to the force of a spring (not shown).

Therefore, when performing IK printing on continuous paper, the operating lever 20
At the position where the suppression roller 9 is placed under slight pressure with the platen 4,
When printing on single [7], the control lever 20' is set to a position where the suppression roller 9 is strongly pressed against the platen 4.

Operation lever 20a when setting 1 continuous paper or 70 single sheets
By maintaining this position, the suppression roller 9 will be separated from the platen 4.

(f) Effects of the invention As explained in detail above, by continuously using the press p-ra,
This has the effect of reducing the number of parts in the platen mechanism, and since the rotatable 1zo roller applies the pack tension, a stable and uniform pack tension is always produced, which greatly improves printing quality.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the platen mechanism of a printing device equipped with a conventional pull inserter, Fig. 2 is an explanatory diagram of the platen mechanism of a printing device according to the present invention, and Fig. 3 is a positioning of the pressing p-ra in Fig. 2. This is an explanatory diagram of the operation lever and operation state for performing the operation. In the figure, l is continuous paper, 7 and 7' are jii sheets, 2 and 8 are guides, 4 is a platen, 5 is a print head, 6 is a continuous paper feed mechanism, 9 is the pressure roller, 12 is the rotation axis of the suppression roller, 20° 20g, 20' is the operating lever, and 14 is the axis of the pressure roller 9.

Claims (1)

[Claims] (1) A platen mechanism of a printing device having a dual inserter with separate insertion slots for continuous paper and single sheets,
A platen mechanism for a printing device, characterized in that it is positioned in a first position determined by operating a control lever, a second position where a weak pressure is applied, and a third position separated from each other.