JPH0711988Y2 - Flat platen device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a flat platen device used in a printing machine.

[Prior Art] Recently, there is a strong demand to reduce the size and weight of the printing machine in order to expand its fields of use. In order to meet such a demand, a printing machine equipped with a flat platen device, which can dramatically reduce the size and weight of a printing machine having a cylindrical stamp, has been gradually used.

As shown in FIG. 5, such a flat platen device includes a flat-shaped stamp board 11 arranged to face the print head 2 and a pair of roller shafts 14 and 14 and pinch rollers arranged to face each other on both sides of the stamp board 11. It is generally composed of 15, 15 and a rotation driving means (not shown) for driving the roller shaft 14.

Here, in order to print on a sheet using a printing machine equipped with the flat platen device, both roller shafts 14 and 14 are synchronously rotated by a rotation driving means, and the roller shaft 14 and the pinch roller on the right side in the figure are rotated. Insert paper 9 between 15. Then, the paper 9 is guided by the paper guide 6 by the cooperation of the roller shaft 14 and the pinch roller 15, and the print head 2
It is sent between the and the stand 11 and is printed.

[Problems to be Solved by the Invention] Here, when the pressure contact force of the pinch roller 15 is small, a slip occurs between the paper 9 and the roller shaft 14, the paper 9 is not fed normally, and a printing defect occurs. Sometimes. Therefore,
In order to prevent such a situation, it is conceivable to increase the diameter of the pinch roller 15 to increase the pressure contact force. However, this causes a disadvantage that the printing machine inevitably becomes large and it is not possible to satisfy the request for downsizing.

Further, a vibration damping member 4 such as a lead plate or thick rubber is provided on the printing surface 11a of the stamp 11 so that even if the print head 2 directly hits the stamp 11, the head 2 is not damaged and printing is performed. Although it is constructed so that no noise is generated in the
The cost is high because it is installed in. Also, due to the structure of the printing machine,
The vibration damping member 4 is struck by the print head 2 at the same number of times more frequently, and the member 4 is easily worn in a short period of time so that high-definition printing is likely to be hindered.

Furthermore, in order to achieve even more high-definition printing and cost reduction, it is possible to easily and quickly assemble the roller shaft 14 and the stamp pad 1 and the like on the frame 1 of the printing machine while keeping the mutual positional relationship constant. Development is desired.

An object of the present invention is to provide a low cost flat platen device that contributes to downsizing of a printing machine, guarantees high-definition printing over a long period of time, and can be easily and quickly assembled to the printing machine. To do.

[Means for Solving the Problems] According to the present invention, a stamp board, a pair of mounting portions integrally formed at both ends of the stamp board in the longitudinal direction for fixing the stamp board to a frame, and both sides of the stamp board are provided. It is composed of a pair of roller shafts that are arranged opposite to each other and are rotatably supported by the mounting portion, and an endless elastic strip plate that is rotatably provided between the roller shafts and covers the stamp.

[Operation] In the present invention, the paper is sent between the print head and the printing plate for printing while being elastically supported by the elastic strip. At this time, since the elastic strips pass between both roller shafts, the print head does not hit the same place so that it is not locally worn and deformed within a short period of time. Therefore, high-definition printing is guaranteed for a long time. Further, the damping action of the elastic strip plate prevents damage to the print head and noise.

Furthermore, the stamp board, the roller shaft, and the elastic strip plate can be assembled to the frame of the printing machine at a time via the mounting portion while maintaining the mutual positional relationship constant. Therefore, it is not necessary to separately attach the stamps and the like to the frame while adjusting the positional relationship with each other, and the stamp can be easily and quickly assembled to the printing machine.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the flat platen device according to this embodiment includes a stamp board 11, a roller shaft 14, an elastic strip plate 21, and a mounting portion 31, and these respective components have a fixed positional relationship with each other. It is integrally formed so that it can be easily and quickly assembled by being held on the printer.

The same components as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

The stamp 11 is formed in a slender shape in a direction perpendicular to the paper feeding direction.

The elastic strip 21 is formed so that the paper can be conveyed while being elastically supported between the roller shafts 14, 14. That is, the elastic strip 21 is formed in an endless shape, and is rotatably provided between the roller shafts 14 and 14 to cover the stamp 11 as shown in FIG. The elastic strip plate 21 is formed of an elastic material having a high friction coefficient such as rubber so as not to slip with the paper 9.

As shown in FIGS. 1 and 4, the mounting portion 31 is provided at both ends 1 in the longitudinal direction of the stamp 11 for fixing the stamp 11 to the frame 1 of the printing machine.
It is formed integrally with 2, 13. In each mounting portion 31, a pair of roller shafts 14 and 14 are disposed opposite to each other on both sides of the stamp 11 via bearings 41 and 41, and are rotatably supported. As a result, the stamp pad 11, the roller shaft 14, and the elastic strip 21 are integrally formed via the attachment portion 31, and the positional relationship between them is accurately maintained constant.

Further, as shown in FIG. 3, the roller shafts 14, 14 are arranged so that the common tangent of the shafts 14, 14 is below the printing surface 11a of the stamp 11 in the drawing. This allows
When the elastic strip 21 is provided between the roller shafts 14 and 14, the strip 21 is stretched by the shafts 14 and 14 and the stamp 11 with a constant tension and does not bend.

Next, the operation will be described.

When the paper 9 is fed between the print head 2 and the printing plate 11 by the cooperation of the roller shaft 14 and the pinch roller 15, the paper 9 is frictionally engaged with the upper side of the elastic strip 21 and is fed while being elastically supported. To be

Therefore, the paper 9 is accurately fed by the cooperation of the roller shaft 14, the pinch roller 15, and the elastic strip 21 to perform high-definition printing. In addition, the paper 9 is a print stand 11
Since the printing is performed with the elastic strip 21 interposed between and, the strip 21 serves as the vibration damping member (4). Further, the stamp pad 11, the roller shafts 14 and 14 and the elastic strip plate 21 are integrally attached to the frame 1 of the printing machine via the attachment portion 31, so that an accurate positional relationship is maintained,
High-definition printing is guaranteed.

Thus, according to this embodiment, the stamp 11 and the stamp 11
The stamp board 1 integrally formed at both ends 12 and 13 in the longitudinal direction of the
A pair of mounting portions 31, 31 for fixing 1 to the frame 1,
A pair of roller shafts 14 and 14 disposed opposite to each other on the both sides of the stamp 11 and rotatably supported by the mounting portions 31 and 31, and rotatably provided between the roller shafts 14 and 14 to cover the stamp 11. Since the flat platen device is composed of the endless elastic strip 21, it contributes to downsizing of the printing machine and guarantees high-definition printing over a long period of time, and it can be easily and quickly assembled to the printing machine. it can.

Further, the paper 9 is fed to the roller shaft 14 and the pinch roller 15
In addition, since the elastic belt plate 21 is configured to convey the paper 9 even if the diameter of the pinch roller 15 is reduced, the paper 9 is conveyed.
There is no slippage between the roller shaft 14 and the roller shaft 14, and the paper 9 can be fed and printed with high accuracy. From this point as well, it is possible to ensure high-definition printing while contributing to downsizing and weight reduction of the printing machine.

Further, since the elastic strip 21 is formed so as to be rotatable and the print head 2 rarely hits the same place, the strip 21 is not locally worn and deformed within a short period of time. . Therefore, also from this point, high-definition printing is guaranteed.

Further, since the printing is performed with the elastic strip 21 interposed between the paper 9 and the stamp 11, the strip 21 serves as a vibration damping member (prevention of damage to the print head 2 and noise prevention). Becomes
High-definition printing is guaranteed also from this point.

Further, since the roller shafts 14 and 14 are formed so that the common tangent line of the shafts 14 and 14 is below the printing surface 11a of the stamp 11, the elastic strip 21 does not loosen. High-definition printing is guaranteed also from this point.

Further, the stamp pad 11, the roller shafts 14, 14 and the elastic strip 21
Since the roller shaft 14 and the stamp pad 1 and the like can be assembled to the frame 1 of the printing machine at one time while keeping the mutual positional relationship constant, the roller shaft 14 and the stamp pad 1 can be assembled at one time. It is possible to facilitate and speed assembly.

[Advantages of the Invention] According to the present invention, a stamp, a pair of mounting portions integrally formed at both ends of the stamp in the longitudinal direction for fixing the stamp to a frame, and a pair of mounting portions facing each other on both sides of the stamp. Since a flat platen device is constituted by a pair of roller shafts that are installed and rotatably supported by the mounting portion, and an endless elastic strip plate that is rotatably provided between the roller shafts and covers the printing plate, printing is performed. High-definition printing can be guaranteed for a long time while contributing to downsizing of the machine, and cost can be reduced by easily and promptly assembling the printing machine.

[Brief description of drawings]

1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the same, FIG. 3 is a side view showing the same, and FIG. 4 is a printer equipped with a flat platen device according to the present invention. 5 and 5 are schematic views showing a conventional flat platen device. DESCRIPTION OF SYMBOLS 1 ... Frame, 11 ... Stamp base, 12, 13 ... End of stamp board, 14 ... Roller shaft, 21 ... Elastic strip, 31 ... Mounting part.

Claims (1)

[Scope of utility model registration request] 1. A stamp, a pair of mounting portions integrally formed on both ends of the stamp in the longitudinal direction for fixing the stamp to a frame, and a pair of mounting portions facing each other on both sides of the stamp. A flat platen device including a pair of roller shafts that are rotatably supported by the roller shaft, and an endless elastic strip plate that is rotatably provided between the roller shafts and covers the stamp.