JP2008149476A - Pressing roller device for printing paper in printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressing roller device for printing paper in a printer which facilitates detachment and attachment of a pressing roller 18 while preventing detachment and falling from a holding bracket 17 by preventing wear at the holding bracket 17 of a roller shaft 22 of the pressing roller 18. <P>SOLUTION: Noting that a holding hole 21 of the holding bracket 17 is made a burring shape (so-called flash shape), thereby increasing its supporting area, and also that a curved part following the burring shape can be utilized as a guide surface of the roller shaft 22, the holding hole 21 which rotatably holds the roller shaft 22 of the pressing roller 18 is formed to a holding side frame part 20 of the holding bracket 17 which rotatably holds the pressing roller 18 pressing the printing paper L in a proper posture in a transfer path 5 direction at a detecting part. At the same time, the holding hole 21 is formed in the burring shape outward from inside of the holding side frame part 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing paper pressing roller device in a printer, and more particularly to a printing paper pressing roller device in a printer for properly pressing printing paper transferred on a transfer path.

There is a type in which a pressing roller is used to stabilize a transfer and its position detection operation by pressing a printing sheet loaded in a conventional printer, transferred and printed on the transfer path.
For example, a printing paper pressing roller device in a printer disclosed in Patent Document 1 will be outlined with reference to FIGS.
FIG. 5 is a schematic cross-sectional view of a printer (for example, thermal printer 1). The thermal printer 1 includes a printer housing 2, a cover 3, a paper supply unit 4 for printing paper L, and a transfer path 5 for printing paper L. And a detection unit 6, a sheet pressing unit 7 (pressing roller device), and a printing unit 8.

    A cover 3 is attached to the open / close shaft 9 of the printer housing 2 so as to be openable and closable so that the printing paper L can be loaded into the printer housing 2. In FIG. 5, the open state of the cover 3 is indicated by a solid line, and the closed state is indicated by a virtual line.

    The cover 3 is provided with a display 10 and a key operation panel 11 so that necessary data or commands can be input.

    The paper supply unit 4 holds the printing paper L such as a label or a tag in a roll shape, and allows the printing paper L to be fed out in a strip shape toward the transfer path 5.

    The transfer path 5 is for transferring the belt-like printing paper L, and the printing paper L is transferred from the paper supply unit 4 through the detection unit 6 and the paper pressing unit 7 by the substrate 12 and the guide inclined plate 13. This can be transported toward this.

The detection unit 6 detects the position of the printing paper L in the transfer path 5. For example, a light reflection type position detection sensor 14 is provided on the back side of the printing paper L.
The position detection sensor 14 is formed on the transfer path 5 (substrate 12) and faces a detection through window 15 fitted with a transparent resin plate or the like, and emits detection light to the back side of the printing paper L. The position of the printing paper L can be detected by the amount of reflected light from a position detection mark (not shown) printed on the back surface of the printing paper L in advance.

    In order to prevent the printing paper L from fluttering in the vertical direction as it is transferred on the cover 3 and to prevent the reading accuracy of the position detection sensor 14 from being lowered, the paper pressing unit 7 properly detects the printing paper L in the detection unit 6. A plate made of metal and having a predetermined elastic urging force that can be pressed in the direction of the transfer path 3 so that the distance between the position detection sensor 14 and the position detection sensor 14 is within a certain range. The spring member 16, the holding bracket 17, and a pair of pressing rollers 18 that are made of synthetic resin and rotate in contact with the surface of the printing paper L.

    The leaf spring material 16 has one end fixed to the back side of the cover 3 and a holding bracket 17 integrally formed with the other end as a free end.

FIG. 6 is an enlarged side view of the holding bracket 17 and the pressing roller 18 viewed from the downstream side in the transport direction of the printing paper L. The holding bracket 17 holds the pressing roller 18 rotatably. And a connecting central portion 19 integrally formed with the leaf spring material 16 and a pair of holding-side frame portions 20 integrally formed on the left and right sides of the connecting central portion 19.
The holding-side frame portion 20 is formed with two pairs of left and right holding holes 21 along the transfer direction, and the roller shaft 22 of the pressing roller 18 is rotatably held in the holding hole 21.

The printing unit 8 includes a thermal head 23 fixed to the cover 3 side and a platen roller 24 fixed to the printer housing 2 side.
When the cover 3 is opened, the space between the thermal head 23 and the platen roller 24 is opened so that the printing paper L can be loaded into the thermal printer 1, and when the cover 3 is closed to the printer housing 2, the thermal head 23 and the platen roller are closed. The roller 24 comes into contact with a predetermined pressure, and the printing paper L is transferred onto the transfer path 5 by driving rotation of the platen roller 24, and predetermined information is printed on the printing paper L by the thermal head 23.

    In the thermal printer 1 and the sheet pressing unit 7 (pressing roller device) having such a configuration, there is a problem that the roller shaft 22 of the pressing roller 18 is worn in the holding hole 21 and the pressing roller 18 is easily dropped from the holding bracket 17.

    FIG. 7 is a cross-sectional view in which the holding hole 21 and the roller shaft 22 are further enlarged, and the synthetic resin roller shaft 22 can freely rotate within the holding hole 21 of the metal holding bracket 17. Since the sheet pressing portion 7 as a whole is pressed with a predetermined pressing force in the direction of the transfer path 5 by the spring force of the leaf spring material 16, and is supported only by the plate thickness portion of the holding side frame portion 20 in the holding hole 21, the roller As a result of the shaft 22 being kept in contact with the upper inner wall surface of the holding hole 21 and being worn, there is a problem that the shaft 22 is easily dropped from the holding bracket 17.

    Further, since the holding bracket 17 is a metal part having a predetermined rigidity, the holding side frame portion 20 is opened to the left and right in order to remove or attach the worn pressing roller 18 from the holding bracket 17 (holding side frame portion 20). There is a problem that it is difficult to operate.

    In addition, there is a problem that the emission accuracy or the reflected light applied to the printing paper L from the position detection sensor 14 is irregularly reflected by the holding bracket 17 located in the vicinity and the reading accuracy of the position detection sensor 14 is lowered.

Japanese Patent Laid-Open No. 11-42828

    SUMMARY OF THE INVENTION The present invention has been considered in view of the above-mentioned problems, and prevents the wear of the holding shaft of the roller shaft of the pressing roller, and makes it difficult for the pressing roller to fall off the holding bracket. It is an object to provide an apparatus.

    Moreover, this invention makes it a subject to provide the press roller apparatus of the printing paper in the printer which made easy removal | desorption of the press roller to a holding bracket.

    Another object of the present invention is to provide a printing sheet pressing roller device in a printer capable of improving the reading accuracy of a position detection sensor.

    That is, according to the present invention, the holding hole of the holding bracket in the paper pressing portion is made a burring shape (so-called burr shape) to increase the support area, and the rounded portion accompanying the burring shape can be used as a guide surface of the roller shaft A transfer path for transferring a belt-shaped print sheet, a detection unit for detecting the position of the print sheet in the transfer path, and a print unit for printing predetermined information on the print sheet; A printer having a pressing roller capable of pressing the printing paper in the transfer path direction in an appropriate posture in the detection unit, and a holding bracket having a pair of holding side frame portions that rotatably hold the pressing roller. In the press roller device for printing paper in the above, the holding side frame of the holding bracket In the printer, wherein the holding hole for rotatably holding the roller shaft is formed in a burring shape from the inside to the outside of the holding side frame portion. This is a pressing roller device for printing paper.

    A knob for opening the pair of holding side frame portions outward can be formed on the tip end side of the holding side frame portion.

    A lightening portion can be formed between a connection center portion that connects the pair of holding side frame portions of the holding bracket and the holding side frame portion.

    The inner wall surface of the connecting bracket that connects the pair of holding side frame portions of the holding bracket facing the position detection sensor of the detection unit can be black.

In the press roller device for printing paper in the printer according to the present invention, the holding hole of the holding bracket (holding side frame) has a burring shape from the inside toward the outside, so the roller shaft of the pressing roller is inserted into the holding hole. The roller shaft can be supported by the entire inner surface of the burring, and the roller shaft is not easily worn by the holding bracket and the pressing roller in the direction of the transfer path (position detection sensor). Can be prevented.
Moreover, since there is a rounded portion associated with the burring shape on the inner wall surface side of the holding side frame portion, after inserting one roller shaft of the pressing roller into one holding hole, the other roller shaft is inserted into the other holding hole. In addition, a marginal space for inserting the roller shaft in an inclined state is ensured, and the rounded portion also serves as a guide surface, so that the roller shaft can be easily attached to and detached from the holding hole.

    The present invention has realized a press roller device for printing paper in a printer that can prevent wear of the press roller and facilitate the detachment operation by the burring shape of the holding hole in the holding bracket.

Next, a printing paper pressing roller device 30 in a printer according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIGS. 5 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.
1 is a side view of the printing paper pressing roller device 30 in the printer as viewed from the upstream side in the transfer direction of the printing paper L, and FIG. 2 is a side view of the printing paper L as viewed from the direction orthogonal to the printing paper L transfer direction. The pressing roller device 30 includes the leaf spring material 16, the holding bracket 17, and a pair of pressing rollers 18 in the same manner as the paper pressing portion 7 (the pressing roller device, see FIG. 1) described above.

FIG. 3 is a perspective view of the holding bracket 17 portion. In the holding bracket 17, a knob 31 protrudes from the distal end side of the pair of left and right holding side frame portions 20, and the pair of holding side frame portions of the holding bracket 17. 20 can be opened outward.
However, the knob 31 protrudes slightly toward the transfer path 5 from the pressing roller 18 on both sides of the pressing roller 18 so that it can be hooked with a finger. It does not affect the pressing action.

    Further, by forming a pair of left and right cutout portions 32 between the connection center portion 19 that connects the pair of holding side frame portions 20 of the holding bracket 17 and the holding side frame portion 20, The rigidity is lowered.

    Further, a black synthetic resin plate 34 having a low light reflectivity is attached to the inner wall surface 33 of the connection center portion 19 facing the position detection sensor 14 of the detection portion 6. Of course, the inner wall surface 33 can be directly colored black, or can be colored with a low reflectance according to the wavelength of light used in the position detection sensor 14.

FIG. 4 is a cross-sectional view in which the holding hole 21 and the roller shaft 22 are further enlarged, and the holding hole 21 is formed in a burring shape from the inside to the outside.
Accordingly, the holding hole 21 itself includes a burring portion 35 slightly protruding outward from the outer wall surface of the holding side frame portion 20, a hole body portion 36 having a uniform diameter connected to the burring portion 35, and a holding side from the hole body portion 36. It is formed by the rounded portion 37 reaching the inner wall surface of the frame portion 20.

    As shown in FIG. 1, a brush portion 38 having a predetermined length is projected in the width direction of the printing paper L from the connection central portion 19 of the holding bracket 17 toward the front of the pressing roller 18, and the above-described transfer path 5 The printing paper L transferred on the guide inclined surface 13 (FIG. 5) is guided from above, and dust on the surface thereof is eliminated so that the printing operation in the printing unit 8 is not hindered.

    In the press roller device 30 of the printing paper in the printer having such a configuration, as shown in FIG. 4 in particular, the roller shaft 22 is in the holding hole 21 depending on the posture of the burring portion 35 and the hole main body portion 36 and the press roller 18. It will be supported rotatably by the part 37, and it is wider than the case where only the holding side frame part 20 has a plate thickness as in the conventional paper pressing part 7 (pressing roller device, see FIG. 7). Since it is supported by the area, its degree of wear is greatly reduced.

    Furthermore, when the presser roller 18 is replaced in the holding bracket 17, it is possible to hook the finger on the left and right pair of knobs 31 and push the finger in the opening direction, and to extend to the connection center portion 19 and the holding side frame portion 20. The lightening portion 32 is formed to reduce the spring force of the entire holding-side frame portion 20, and the radius portion serves as a guide surface, so that the pressing roller 18 can be easily replaced.

Further, since the black synthetic resin plate 34 is provided on the inner wall surface 33 of the connection center portion 19, the reflectance at the inner wall surface 33 is lowered, and the emitted light from the position detection sensor 14 is less likely to be irregularly reflected, and the position detection sensor 14. Reading accuracy can be improved.

FIG. 4 is a side view of the upstream side from the downstream side in the transfer direction of the printing paper L of the printing paper pressing roller device 30 in the printer according to the embodiment of the present invention. FIG. 6 is a side view of the printing paper L viewed from a direction orthogonal to the transfer direction of the printing paper L; It is a perspective view of the holding bracket 17 part. It is sectional drawing which expanded the holding hole 21 and the roller axis | shaft 22 part similarly. It is a schematic sectional drawing of the conventional thermal printer 1. FIG. FIG. 6 is an enlarged side view of the holding bracket 17 and the pressing roller 18 as viewed from the downstream side in the transfer direction of the printing paper L. It is sectional drawing which expanded the holding hole 21 and the roller axis | shaft 22 part similarly.

Explanation of symbols

1 Thermal printer (conventional, Fig. 5)
2 Printer housing 3 Cover 4 Paper supply unit 5 Transfer path 6 Detection unit 7 Paper pressing unit (conventional pressing roller device, FIGS. 6 and 7)
8 Printing unit 9 Opening / closing axis 10 Display 11 Key operation panel 12 Substrate 13 Gradient plate 14 Position detection sensor (light reflection type)
DESCRIPTION OF SYMBOLS 15 Detection penetration window 16 Leaf spring material 17 Holding bracket 18 Pressing roller 19 Connection center part 20 Holding side frame part 21 Holding hole 22 Roller shaft 23 Thermal head 24 Platen roller 30 Pressing roller apparatus of the printing paper in a printer (Example, figure) 1 to 4)
31 A knob 32 formed on the tip end side of the holding side frame portion 20, a lightening portion 33 formed between the connection center portion 19 and the holding side frame portion 20, an inner wall surface 34 of the connection center portion 19, a black synthetic resin plate 35, Burring portion 36 of hole 21 Hole body portion 37 of holding hole 21 Earl portion 38 of holding hole 21 Brush portion L Printing paper (label, tag, etc.)

Claims (4)

A transfer path for transferring strip-shaped printing paper;
A detection unit for detecting the position of the printing paper in the transfer path;
A printing section for printing predetermined information on the printing paper;
A pressing roller capable of pressing the printing paper in an appropriate posture in the detection path in the detection unit;
A holding roller having a pair of holding side frame portions that rotatably hold the pressing roller, and a pressing roller device for printing paper in a printer having:
While forming a holding hole for rotatably holding the roller shaft of the pressing roller in the holding side frame portion of the holding bracket,
The holding hole is a pressing roller device for printing paper in a printer, wherein the holding hole is formed in a burring shape from the inside to the outside of the holding side frame. The press roller device for printing paper in the printer according to claim 1, wherein a knob for opening the pair of holding side frame portions outward is formed on a tip end side of the holding side frame portion. 2. A press roller for printing paper in a printer according to claim 1, wherein a lightening portion is formed between a connection center portion for connecting the pair of holding side frame portions of the holding bracket and the holding side frame portion. apparatus. 2. The printing paper for a printer according to claim 1, wherein a connecting central portion connecting the pair of holding side frame portions of the holding bracket has a black inner wall surface facing a position detection sensor of the detection portion. Pressing roller device.

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