JPS61279569A - Printer - Google Patents

Abstract

PURPOSE:To perform printing with high quality even in the vicinity of a binding part of a booklet form medium without any trouble in passing the medium through a platen, by a construction wherein one movable platen on the side on which a bound part of a booklet form medium is located can be freely moved downward, and the other movable platen is fixed at an upper position. CONSTITUTION:A fixed platen 2 is disposed on the lower side of an opening 1A, while a printing head 3 is disposed on the upper side of the opening 1A so that it can be moved up and down, and a pair of movable platens 5A, 5B are disposed at positions corresponding to a pair of paper bails 4A, 4B. A link mechanism 6A comprises an L-shaped member 8A having one end connected to the platen 5A, and a member 10A connecting the other end of the member 8A to a plunger 9A of a solenoid 7A. The force of a spring 13 for pushing up the platen 5A is sufficiently small as compared with a force with which a magnetic head 3 is lowered for printing. With the solenoid 7A excited, the plunger 9A is attracted, whereby the platen 5A is fixed at the upper position, and is prevented from moving downward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device that makes it possible to perform high-quality printing even near the binding portion when printing on a booklet-like medium.

[Prior Art and Problems to be Solved by the Invention] For example, a booklet-like medium such as a bank passbook is bent at its binding portion. The larger the number of media and the thicker the paper, the larger the bent shape. When printing on such a face-shaped medium, the bent shape of the stitching portion may impede the printing operation using conventional printing devices. In other words, in the case of conventional printing devices, the side of the platen that faces the print head is made flat in consideration of the fact that the medium passes over the platen or that printing is performed on ordinary media such as so-called cut paper. is common. In the case of such a shape, when trying to print on the above-mentioned booklet-like medium, when it comes to the vicinity of the binding part, it is not possible to hold the medium flat due to the shape of the binding part (the thickness of the binding part is As a result, the quality of printing deteriorates or printing near the seam becomes impossible.

The present invention has been made based on the above points, and its purpose is to perform high-quality printing on a booklet-like medium up to the vicinity of the binding area without causing any hindrance to the passage of the medium through the platen. Our goal is to provide a printing device that is of the highest quality.

[Means for solving the problem 1 That is, the printing device according to the present invention includes a fixed platen for printing, a movable platen installed on both sides of the fixed platen and movable up and down, and a movable platen installed above the fixed platen. a print head; a pair of paper pressers installed on both sides of the print head at positions corresponding to the movable platen;
A pair of drive sources respectively connected to the movable platen, and when the binding section of the booklet-like medium is located on one movable platen, the drive source connected to the other movable platen is turned on in synchronization with the printing operation. The apparatus is characterized by comprising a control means for fixing the movable platen at an upper position.

[Operation] In other words, when printing on a booklet-like medium, the movable platen on the side where the binding section is located is left in a free state and is lowered by the binding section to absorb the increase in thickness due to the binding section. The other movable platen is fixed at an upper position and restricted from moving downward to maintain the paper pressing function of the paper presser and the appropriate distance between the medium surface and the print head.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing the configuration of the vicinity of the printing unit of the printing device according to the present embodiment. In the figure, reference numeral 1 indicates a medium conveyance table, and the medium m conveyance table 1 has an opening 1A extending in its longitudinal direction. It is formed in a direction perpendicular to the plane of the paper. A fixed platen 2 is installed on the lower side with this frontage 1A in between, and a print head 3 is installed on the upper side so as to be movable up and down. A pair of paper pressers 4A and 4B are fixed on both sides of the print head 3.

The pair of paper pressers 4 on both sides of the fixed platen 2
A pair of movable platens 5A and 5B are installed at positions corresponding to A and 4B.

The movable platen 5A is connected to a solenoid 7A via a link mechanism 6A. The link mechanism 6A is composed of a linear member 8A having one end connected to the movable platen 5A, and a member 10A connecting the other end of the linear member 8A to the plunger 9A of the solenoid 7A. . Further, a spring 13A is stretched between the above-mentioned cross-shaped member 8A and the printing device main body 12. The force of pushing up the movable platen 5A by the spring 13A is sufficiently smaller than the force with which the navigation magnetic head 3 descends for printing. When the solenoid 7A is de-energized, the plunger 9A can freely move in the direction not shown by the arrow in the figure, and therefore the movable platen 5A can also freely move up and down. On the other hand, when the solenoid 7A is energized, the plunger 9A is attracted to the right in the figure, thereby fixing the movable platen 5A at the upper position and restricting its downward movement. Furthermore, the movable platen 5B (1) has the same structure as the above-mentioned movable platen 5A, and is indicated by the same reference numeral 8 in the figure.

By energizing solenoid 7B, plunge 179
B is attracted to the left in the figure, and the movable platen 5B is fixed at the upper position and restricted from moving downward. Note that the force of pushing up the movable platen 5B by the spring 13B, like the spring 13Δ, is sufficiently smaller than the force with which the magnetic head 3 descends for printing. First, when printing on ordinary media such as ordinary cut paper, the solenoid on the side where the cut paper is inserted, for example, when inserting the cut paper from the right side in the figure, the solenoid 7A is energized and the movable platen 5A is activated. It is fixed at the upper position to ensure the paper pressing function of the paper presser 4A and an appropriate distance between the medium surface and the print head.

In this state, the cut paper is conveyed from the right side and printing is performed.

Next, the case of printing on a booklet-like medium will be explained. In this case, the booklet-like medium 21 is first inserted from the right side in FIG. At that time, the solenoid 7A is energized and the movable platen 5A is fixed at the upper position. Then, the medium 21 further advances to the left in the figure, and the binding portion 2
1A is located on the movable platen 5Δ, the solenoid 7
Solenoid A is de-energized, while solenoid 7B is energized. As a result, the movable platen 5A is free to move downward, and since the pressing force of the paper presser 4A is stronger than the force of the spring 13A, the movable platen 5A is pushed downward. On the other hand, since the solenoid 7B of the movable platen 5B is energized, its downward movement is restricted and it is fixed at the upper position.

This is the state not shown in FIG.

Next, a case will be described in which the medium 21 advances further and the binding portion 21A comes to the left side of the print head 3 in the figure.

FIG. 3 shows this state. In this case as well, the solenoid 7A is energized and the solenoid 7B is de-energized, as described above. As a result, the movable platen 5A is restricted from moving downward and is fixed upward, while the movable platen 5B becomes free, so that the binding section 2
1A pushes the movable platen 5B downward.

The above is the operation when printing on the round-shaped medium 21.

As described above, according to the printing device according to this embodiment, the booklet-like medium 21
Since the movable platen on the side where the stitching section 21A is located is free to move downward, and the other movable platen is fixed in the upper position, the stitching section 21A can be moved while maintaining the paper pressing function. It is possible to effectively absorb the increase in the thickness of the medium 21 caused by the binding part 21.
High-quality printing can be performed up to the vicinity of A.

[Effects of the Invention] According to the printing device according to the present invention, when printing on a booklet-like medium, high-quality printing can be performed up to the vicinity of the binding portion without causing any hindrance to the passage of the medium through the platen.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
The figure shows a part of the printing device d, and FIGS. 2 and 3 show the operation when printing on a booklet-like medium. 1...Table, 2...Fixed platen, 3...Print head, 4A, 4B...Paper presser, 5A, 5B...
Movable platen, 6A, 6B...Link mechanism, 7A, 7
B... Drive source. Applicant's agent Patent attorney Takehiko Suzue No. 1 (!!3 Figure 2)

Claims (1)

[Claims] A fixed platen for printing, a movable platen installed on both sides of the fixed platen and movable up and down, a print head installed above the fixed platen, and a platen on both sides of the print head corresponding to the movable platen. a pair of paper pressers installed at positions, a pair of drive sources respectively connected to the movable platen, and a pair of drive sources connected to the other movable platen when the binding section of the booklet-like medium is located on the other movable platen. 1. A printing device comprising: control means for turning on a drive source in synchronization with a printing operation to fix the movable platen in an upper position.