JPS5921008Y2 - Impact printer platen support device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a platen support device for an impact printer that prints characters, numbers, symbols, etc. on printing paper placed in front of the platen, and is particularly easy to manufacture and assemble, and is inexpensive. The purpose is to obtain something.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a plan view of essential parts of a dot impact printer showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A.

In the figure, 1 is the print head, and in this dot impact printer, as shown in Figure 1, eight of them are arranged side by side at equal intervals in the horizontal direction, and each print head is connected to the print wire 2.
and an electromagnetic solenoid 3 for reciprocating the print wire 2 in the front and back direction in response to the arrival of a print signal. installed.

A cylindrical platen 5 is a commercially available metal cylindrical tube whose surface is plated, and a rubber plate 6 is adhered to the entire inner surface of the platen.

7 is a base on which this cylindrical platen 5 is placed;
It has a horizontal plane 7a and a vertical plane 7b that are perpendicular to each other, and a plane 7C that is located at an angle of approximately 45 degrees to the connecting part of these two planes 7a and 7b, and the two planes 7a and 7b allow the cylindrical platen to be It is for positioning.

8 is a pair of fixing screws for fixing the platen 5 to the base 7;
It is attached from the opposite side of the platen 5 toward the platen 5 by penetrating the part including the base plate 7.
It is fixed by screwing it by pulling it in the direction.

A pair of adjusting screws 9 are screwed onto the platen 5 from the rear near both ends of the base 7, penetrating through the portion including the vertical surface 7b, and fixed by double nuts 9a, respectively. In order to keep the printing surface of the platen 5 parallel to the horizontal running line of the tip of the print wire 2 of the print head 1, the tip 9b of the print wire 2 is brought into contact with the platen 5. This allows for fine adjustment in the front-back direction.

Reference numeral 10 denotes a printing paper arranged in front of the platen 5, and an ink ribbon 11 is installed near the printing position on this printing paper 10.

In the printer configured as described above, the electromagnetic solenoid 3 of the print head 1 is activated in response to the arrival of a print signal to drive and control the print wire 2, and at the same time, the print head 1 is placed on the printer. A carriage 4, which is attached to the printer, reciprocates parallel to the surface of the platen 5, and a printing paper feeding mechanism (not shown) moves the printing paper 10 in a direction perpendicular to the direction of movement of the carriage 4.

Therefore, characters, numbers, symbols, etc. made up of a set of dots on the printing paper 10 are formed by all these cooperative actions.

In such dot impact printers, the cylindrical platen allows commercially available extruded metal tubes to be used as is, making the installation process described later easier than conventional printers with a flat platen. This method is superior in terms of overall weight reduction and manufacturing cost.

As for the shape of this platen, a cylindrical one as in the embodiment can be obtained at the lowest cost, and moreover, an inexpensive configuration is possible.

However, the problems in this case are vibration and sound during printing due to the thinness of the metal body that makes up the platen, and the fixing method to keep the platen horizontal and parallel to the print head. In this embodiment, as shown in the example in which a rubber plate is attached to the inner surface, sufficient consideration has been given to suppressing vibration and sound during printing, and instead of attaching a rubber plate in this way, cork is used. The same effect can be obtained by packing the material with a large amount of internal friction, such as a foamed plastic material, into the inside of the cylindrical platen, or in the case of a non-cylindrical platen, into the cavity between the platen and the base on which it is attached. can get.

As for the mounting method of the platen, as shown in the embodiment, the platen placed on the base is positioned by the horizontal and vertical surfaces of the base 7, and the fixing method is as described above. It can be easily fixed by simply pulling the platen 5 in a direction perpendicular to the inclined plane 7C sandwiched between the planes and screwing it in. Furthermore, the parallelism of the platen to the running line of the print head is directly determined in the part including the vertical plane. A pair of screws are provided for fine adjustment, so you can easily make fine adjustments by adjusting both appropriately, just like in the case of a conventional flat platen.
This solves not only the accuracy of the platen itself, but also the difficulty of adjusting the horizontal and parallelism with respect to the print head's running line when attaching it to the base.

In the example, we have described the case where this platen is used in a dot impact printer, but this platen can also be used in various impact type printers, including so-called chain printers, in which a large number of print characters are placed on a single belt. It can be applied to printers such as

As detailed above, the platen support device of the present invention has various advantages, including the fact that it is easy to manufacture and assemble, and can be configured at low cost, and has an extremely large industrial effect. .

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of a dot impact printer showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA. In the figure, 5 is a platen, and 6 is a rubber plate for suppressing vibration and sound.

Claims (1)

[Claim for Utility Model Registration] Printing is performed by a print head that moves back and forth along the print lines of print paper placed on the print surface of a cylindrical metal platen whose inner surface is made of a material with high internal friction. In an impact printer that prints characters, etc. on paper, a vertical plane parallel to the printing surface of the platen, a horizontal plane perpendicular to the vertical plane, and 2,000 planes thereof are connected to a base fixed to the machine frame. A connecting plane is provided, and the platen is supported on the base by fixing means provided on the connecting plane, and a printing surface is provided on the vertical plane for positioning the printing surface of the platen parallel to the moving direction of the print head. A platen support device for an impact printer is provided with a pair of adjustable left and right positioning members that abut the platen from the opposite side.