JPS59230777A - Paper guide mechanism - Google Patents

Abstract

PURPOSE:To provide the titled mechanism capable of enhancing printing quality and facilitating fitting and detaching a ribbon separator, wherein a detecting mechanism for the trailing end of a paper and a paper-pressing mechanism are provided as one body in proximity to a printing position, and a guide plate is provided with a ribbon separator. CONSTITUTION:When printing, a paper-pressing member 24 presses a paper 22 against a guide plate 20 through a window 21a of a guide plate 21, thereby imparting a tension to the paper 22. A paper-detecting actuator 27 makes contact with the paper 22 through the window 21a, and when the paper is completely used, the actuator 27 is brought out to a window 20b of the guide plate 20, and is rotated counterclockwise to turn ON a microswitch 29, thereby detecting the trailing end of the paper. The paper-pressing member 24 is brought closer to a printing part, whereby deviation of the paper is reduced. The ribbon separator 47 is detachably fitted to a guide plate 41 by inserting a separating sheet between the paper 40 and an ink ribbon 46, thereby simplifying the construction and facilitating fitting and detaching the ribbon separator 47.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a paper guide mechanism for a printing device, and more particularly to a paper guide mechanism having a paper end detection, paper presser, and ink generator/grader mechanism.

PRIOR ART AND PROBLEMS FIG. 1 is a diagram for explaining a conventional paper guide mechanism having a paper end detection mechanism and a paper holding mechanism, in which 1 is paper, 2 is a platen, 3 is a printing mechanism, and 4 is a tractor. , 5 respectively show the paper guide mechanism. The paper guide mechanism 5 includes a guide plate 6 a 'r 6 that guides the paper.
b % Paper end detection actuator 7, microswitch 8 operated by the actuator, paper holding member 9
, springs 10, 11, etc.

In such a paper guide mechanism, in order to correctly detect the end of the paper, the actuator 7 must move to the right when the paper is on the shoulder (the microswitch is OFF), and when there is no paper, the actuator 7 must move to the right side (the microswitch is OFF). Fall into the hole 12 of 6& and turn on the micro switch 8.
Therefore, it was necessary to arrange the paper pressing member 9 below the actuator 7 for detecting the paper end. - Practical paper is subjected to lateral shearing force in the horizontal direction by the printing mechanism 3 (in this example, the wire pin of the print head that moves horizontally in the printing direction), and due to the inertia of the paper itself due to high-speed feeding, the paper is This causes a so-called overshoot phenomenon in which there is slack between the platen 2 and the tractor 40. In order to prevent these and obtain good printing quality, it is better to move the paper holding member 9 as close to the P printing position as possible, but in the conventional paper guide mechanism, as described above, the paper end detection actuator mechanism and the paper holding mechanism Since these were separated, both had to be performed to some extent, which had a disadvantage in that it had an adverse effect on printing quality.

Furthermore, in order to prevent the paper from becoming dirty due to the running of the - character, conventionally a gun separator as shown in FIG. 2 has been provided. This glue separator 13 is platen 2
It was inserted between the upper paper 1 and the ink ribbon 14 on the printing mechanism 3 side, avoiding the printing surface, and was fixed to the printing mechanism unit 15 with screws or adhesive.

Usually the ribbon separator 13 has a thickness of 0.05 to 0.3wt.
Since it is made of a thin plate such as a polyester film or a stainless steel sheet, it needs to be replaced periodically, but in the past, there was a drawback that it could not be replaced without removing the printing mechanism unit.

In addition, since the recan separator is attached to the printing mechanism unit that moves back and forth in the horizontal direction, the recan separator rubs against the paper. There was a drawback that there was a problem that the two parts could get caught and damage each other.

Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention integrates a paper end detection mechanism and a paper holding mechanism that prevents the paper from shifting due to printing paper transport, which were conventionally arranged separately, and provides a paper end detection mechanism that is placed near the printing position. It is an object of the present invention to provide a paper guide mechanism that can be arranged to improve print quality.

A further object of the present invention is to provide a paper guide mechanism having a ribbon separator that is easy to replace and does not damage the paper.

Structure and object of the invention The present invention provides a paper guide mechanism equipped with a guide plate that guides paper when feeding continuous paper for printing to a printing section, in which a platen and a print head constituting the printing section are connected to each other. The guide plate is provided with a swinging member that operates in conjunction with an operation to enlarge the gap when loading paper, and the swinging member includes a paper holding member, an actuator for detecting the end of paper, and a microswitch that is operated by the actuator. This is achieved by providing a paper guide mechanism that is equipped with an n1 paper presser and is capable of detecting the end of the paper.

Furthermore, in a paper guide mechanism including a guide plate for guiding paper when feeding continuous paper for printing to a printing unit, the guide plate is provided with at least two members having spring properties, and the spring member is provided with at least two spring members. A ribbon separator is provided to shoulder the hole that engages with the ribbon separator, and the tip of the ribbon separator is inserted between the paper and the ink ring, and the spring member allows the ribbon separator to be freely attached to and detached from the guide plate. DESCRIPTION OF THE PREFERRED EMBODIMENTS This is achieved by providing a paper guide mechanism characterized in that it is configured to be mounted.

3 and 4 show the first paper guide mechanism according to the present invention.
Fig. 3 is a side sectional view including a part of the printing device, and Fig. 4 is a view taken in two directions, excluding the guide plate in Fig. 3. Show. In both figures, 20.
21 is a guide plate that guides the paper 22; 23 is a rectangular shaft with both ends pivoted on a side plate 20a extending laterally of the guide plate 20; 24 is a paper holding member attached to the shaft 23; 25
is a swinging member attached to the shaft 23, 26 is a bearing fitting provided on the swinging member 25, and 27 is a pin 28 attached to the bearing fitting 26.
A paper end detection actuator 29 is rotatably supported by a shaft, and a microswitch 3o is attached to a bearing fitting 26 and is actuated by a paper end detection actuator 27.

Reference numeral 31 designates a spring that urges the swinging member 25 and the sheet end detection actuator to rotate counterclockwise, respectively. Note that 32 is a print head, 3
3 is a platen, 34 is an eccentric cam for moving the platen, 35
is its operating lever.

This embodiment includes an eccentric cam 34 for moving the platen and a swinging member 2.
A gap A is provided between the paper holding member 24 and the upper part of the guide plate 2 by the spring 3o during printing.
The paper 22 is pressed against the guide plate 2o through a window 21a provided in the guide plate 2o to apply tension to the paper 22. Further, when there is paper, the paper detection actuator 27 contacts the paper 22 through the window 21a of the guide plate 21, and in this state the microswitch is turned OFF. When the paper runs out, the paper detection actuator 27 no longer supports the paper 22, so it comes out to the NFC window 20b provided on the guide plate 20, rotates counterclockwise, turns on the microswitch 29, and detects the end of the paper. I can do it.

When setting paper, the platen 33 is rotated by rotating the eccentric cam operating lever 35 clockwise to a predetermined position 35'.
is moved in the direction of arrow P to widen the gap between it and the print head 32, and at the same time presses the swinging member 25 to rotate it clockwise against the spring 30. Due to this, the paper holding member 24 and the paper end detection actuator 27 retreat to the right, so the paper route formed between the guide plates 20 and 21 is opened, and paper can be easily set (inserted downward and upward). becomes.

In this embodiment described above, the paper holding member 24 is moved closer to the printing unit than in the conventional case, so the amount of paper deviation is small (1/2 to 1/4 compared to the conventional one), and printing quality can be improved. This also reduces the vertical deviation between the first sheet and the plurality of sheets when overlapping sheets are used. Furthermore, the platen section, paper holding section, and paper end detection actuator section can expand the paper route with a single lever operation, making it easier to set paper.In addition, the paper holding mechanism and paper end detection mechanism, which were previously separate, are now available. Because it is integrated, the number of parts is reduced, which reduces the total cost by RL1, and the dimensions required for assembly (for example, gap A and spring force) can be controlled, making assembly, maintenance, and replacement of parts easier. shoulder.

Next, a second embodiment of the paper guide mechanism according to the present invention will be explained.
This will be explained using Figure 5. In the same figure, 40 is paper;
1 and 42 are guide plates that guide the paper, 43 is a platen, 44 is a print head, 45 is a tractor that feeds the paper, 4
6 shows an ink libin and a 47 Fi rebar separator.

In this embodiment, the ribbon separator 47 is connected to the paper 40 as shown in the figure. The separate sheet is inserted between the guide plate 41 and the guide plate 41 in a detachable manner.

FIG. 6 is a perspective view for explaining the details of the ribbon separator, 47 is a ribbon separator, 48 is a ribbon separator sheet, 49 is a ribbon separator mounting member, 5
0 indicates a square hole for mounting the same, 51 indicates a paper guide plate, and 52 indicates a leaf spring for fixing the sensor plate. This ribbon separator 47 is made by gluing a thin plate such as a polyester film or stainless steel sheet with a thickness of about 0.05 to 0.3 nm to a ribbon separator mounting member 49 having a square hole 50, and attaching it to a paper guide plate 51. The square hole 50 is engaged with the convex portion 52m of the provided leaf spring 52, and the plate spring 52 is detachably mounted.

The present embodiment constructed in this way has a simple structure,
The ribbon separator is easy to attach and detach.

Since the separator is attached to the guide plate, there is no movement in the lateral direction with respect to the paper, and damage to the paper and the separator is prevented.

FIG. 7 is a diagram showing another embodiment of the beam separator, in which 60 is a separate sheet, 61 is a beam separator; The separator mounting member is shown. This embodiment is different from the previous embodiment shown in FIG. By sandwiching it between the two, the bond is strengthened. Note that other effects are the same as in the previous embodiment.

Effects of the Invention As described in detail above, the paper guide mechanism according to the present invention improves printing quality by integrating the paper end detection mechanism and the paper holding mechanism and disposing them near the printing position, and improves printing quality by integrating the paper end detection mechanism and the paper holding mechanism and by arranging the paper end detection mechanism and the paper holding mechanism in the vicinity of the printing position. Easier attachment/detachment operation by providing a controller on the paper guide plate, and This has great effects in that it makes it possible to prevent damage to paper, paper, etc.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional paper guide mechanism, FIG. 2 is a diagram for explaining a conventional glue separator mechanism, and FIGS. 3 and 4 are diagrams for explaining a paper guide mechanism according to the present invention. 5 and 6 are diagrams for explaining the second embodiment of the paper guide mechanism according to the present invention, and FIG. 7 is another embodiment of the Riponse i9 plate. FIG. In the drawings, 20, 21, 41, 42 are paper guide plates, 22, 40 are paper sheets, 24 is a paper pressing member, 25 is a swinging member, 26 is a bearing fitting, 27 is an actuator for detecting the end of paper, and 29 is a micro switch. , 30, 3.1 are springs, 32.44 are print heads, 33.43 are platens, 34 are eccentric cams, 35 are eccentric cam operating levers, 46
Ink ribbon, 47 Harigan separator, 48, 61
j: Rigansenofreta sheet, 49.61 is a ribbon separator mounting member, and 52 is a leaf spring. Patent applicant Fujitsu Limited Patent agent Patent attorney Akira Aomi Patent attorney Kazuyuki Nishidate Patent attorney 1) Yukio Patent attorney Akiyuki Yamaguchi Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. In a paper guide mechanism equipped with a guide plate that guides the paper when feeding continuous paper for printing to the printing unit, the paper is loaded in the gap between the platen and the print head that constitute the printing unit. The guide plate is provided with a swinging member that operates in conjunction with the enlarging operation, and the swinging member is equipped with a paper holding member, an actuator for detecting the end of paper, and a microswitch that is operated by the actuator. A paper guide mechanism characterized by being capable of holding paper and detecting the end of paper. 2. In a paper guide mechanism equipped with a guide plate for guiding paper when feeding continuous paper for printing to a printing unit, the guide plate is provided with at least two spring-bearing members; A ribbon separator t having a hole that engages with the member. 1. A paper guide mechanism, characterized in that a separator is detachably attached to the guide plate by the spring member so that its leading end is inserted between the paper and the ink ribbon.