JPH0118359Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the printing head of an ink-type wire dot printer, and its purpose is to prevent air from being sucked into the occlusion body from around the printing wire in the tip guide section when the printing wire returns. death,
This is to prevent ink supply from running out or uneven printing.

Conventionally, as shown in FIGS. 1 and 2, an occluding body 3 is arranged in an occluding body chamber 2 around the outer periphery of a predetermined number of printing wires 1 arranged in one row, and an ink pipe 5 from an ink tank 4 is connected to the occluding body chamber 2. An ink-type wire dot printer connected to the printing wire 2 is well known, but when the printing wire 1 is energized, the ink attached to the tip of the printing wire 1 is attached to the printing paper 6, and at this time, the pressure inside the absorber chamber 2 is Negative pressure is generated by the amount pushed out, and an attempt is made to replenish this amount from the ink pipe 5, but
Since the supply system is closed, when the printing wire 1 returns, air is sucked into the storage body 3 from around the printing wire 1 in the tip guide section 7, and air bubbles get mixed into the ink pipe 5, causing ink shortage and uneven printing. It had the disadvantage of causing

The present invention eliminates the drawbacks of the prior art by providing an air hole that communicates the storage chamber with the outside air so that the pressure in the storage chamber is always constant at the outside pressure.

Next, an embodiment of the present invention shown in FIG. 3 will be described in detail. The printing wire 10 is the tip guide 1
1 are arranged in a vertical row, and the printing wire 10 is sandwiched between the occluding bodies 13 built in the occluding body chamber 12.
An ink pipe 14 is pressure-welded to the upper part of 3.
Ink is transferred from the ink tank 15 to the ink pipe 14
is supplied to the storage body 13 via the valve 16. 17,
A detection electrode 18 detects the amount of ink stored in the storage body 13, and when a predetermined amount of ink is reached, the valve 16 is closed and the ink supply is stopped. Reference numeral 19 denotes an air hole of the present invention, which communicates the storage chamber 12 with the front end surface 20a of the printing head 20.

According to the present invention, the absorber chamber 12 always has air holes 19
Since it communicates with the outside air, the pressure of the outside air is constant. Therefore, when the printing wire returns, air is not sucked in from the outer periphery of the tip of the printing wire, thereby reliably eliminating ink shortages and uneven printing.

Note that the air hole may be provided on a side surface other than the front end surface of the print head as long as it communicates with the outside air.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an ink-type wire dot printer, FIG. 2 is a front sectional view of a conventional printing head, and FIG. 3 is a front sectional perspective view of an embodiment of the present invention. 10...Printing wire, 11...Tip guide, 12...
occluding body chamber, 13... occluding body, 14... ink pipe,
15... Ink tank, 16... Valve, 19... Air hole,
20...Print head, 20a...Print head tip surface.

Claims (1)

[Scope of utility model registration request] In an ink-type wire dot printer in which an occlusion body is arranged around the outer periphery of a predetermined number of printing wires arranged in a row, and an ink pipe from an ink tank is connected to the occlusion body, air is used to communicate between the occlusion body chamber and the outside air. A print head for an ink-type wire dot printer with holes.