JPH02155681A - Printing head cooler - Google Patents

Abstract

PURPOSE:To cool a printing head sufficiently to an inside part thereof and preventing perfectly the inside part of the head from being heated to a high temperature by providing a single pipe passed through the printing head, a heat exchanging means for cooling a coolant circulated in the pipe, and a pump for circulating the coolant in the pipe. CONSTITUTION:A printing head cooler comprises at least one pipe 1 in which a coolant is circulated and which is passed through a printing head 2, a fan 5 for cooling the coolant circulated in the pipe 1, and a pump 4 for circulating the coolant in the pipe 1. The pipe 1 is formed of a flexible material having good heat conductivity, such as a vinyl polymer pipe, and is disposed to pass through a gap 11 between the head 2 and a heat sink 3. The coolant having deprived the heat of the head 2 is sent to a radiator part 9, where it is cooled efficiently by the fan 5, and is returned to the pump 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a print/yield cooling device for a dot impact printer, and particularly to a print head cooling device for a dot impact printer having an electromagnetic print head.

[Prior Art] The electromagnetic print head of this type of conventional dot impact printer becomes hot due to the heat generated by high-speed printing. In particular, by intensive use of only specific dot pins,
The print head becomes locally hot, causing damage to the print head.

Therefore, in order to prevent the print head from becoming hot, conventionally,
A fan was installed inside the printer opposite the print head to cool it using forced air cooling.

In this type of conventional dot impact printer, a temperature sensor is installed in the print head in order to avoid complete damage to the print head.

If a part of the print head reaches a certain temperature or higher, the print speed is slowed down to prevent further overheating.

[Problems to be Solved by the Invention] In the forced air cooling method of the conventional dot impact printer described above, the print head is cooled by air from the outside, so the inside of the print head is not cooled well and the inside of the print head becomes hot. It had As a result, the temperature sensor of the print head operates frequently, which has the disadvantage of slowing down the printing speed of the print head.

[Means for Solving the Problems] An object of the present invention is to solve the problems of the prior art described above, and to provide a dot impact printer that can sufficiently cool the inside of the print head and completely prevent the inside of the print head from becoming high temperature. An object of the present invention is to provide a print head cooling device.

The print head cooling device of the present invention achieves the above object, and is used in a dot impact printer having an electromagnetic print head, in which a cooling medium passes through at least one print head in which a cooling medium is circulated. It is characterized by having a pipe installed therein, a heat exchange means for cooling a cooling medium circulating inside the pipe, and a pump circulating the cooling medium inside the pipe.

[Example] Hereinafter, the print head cooling device of the present invention will be described in detail using the drawings.

FIG. 1 is a plan view of an embodiment of a print head cooling device according to the present invention.

2 is a front view of the print head cooling device of FIG. 1; FIG.

3 is an enlarged front view of the print head in the print head cooling device of FIG. 1. FIG. FIG. 4 is an enlarged plan view of the print head in the print head cooling device of FIG. 1.

As schematically illustrated in FIGS. 1 and 2, the print head cooling device according to the invention includes at least one print head 2 through which a cooling medium is circulated. A pipe 1 installed in the pipe 1, a fan 5 that cools the cooling medium circulating inside the pipe 1, and
It is composed of a pump 4 that circulates a cooling medium inside.

The pipe 1 and the pump 4 are disposed within an outer frame 7 extending from the bottom of an outer frame 6 of the printer. The pipe 1 is preferably made of a material that is flexible and has good thermal conductivity, such as a vinyl pipe.
As shown in FIG. 4 and FIG. 4, the piping is arranged so as to pass through a gap 11 formed between the print head 2 and the heat sink 3.

For the heat sink 3, it is preferable to select a material with good thermal conductivity so that heat exchange with the cooling medium circulating in the pipe 1, preferably water, can be performed efficiently.

Since the pipe 1 is made of a flexible material, as the print head 2 moves back and forth in the direction of arrow A along a platen, not shown, the pipe 1 moves accordingly.

The cooling medium circulated through the pipe 1 by the pump 4 removes heat from the print head 2 and is then sent to the radiator section 9, where it is efficiently cooled by the fan 5 and returns to the pump 4 again.

In the illustrated preferred embodiment, the heat exchange means employs an air cooling system consisting of a radiator section and a fan 5, but other cooling systems may also be employed.

[Effects of the Invention] As described above, the present invention cools the inside! ! a pipe disposed to pass through at least one print head through which a medium is circulated; a heat exchange means for cooling a cooling medium circulating within the pipe; and a heat exchange means for cooling a cooling medium circulating within the pipe. This has the effect of cooling the inside of the print head well and completely preventing the inside of the print head from becoming hot. by this,
It is possible to avoid situations where the print head's temperature sensor frequently activates and slows down the print speed of the print head.
Overall, the printing speed of the print head can be increased.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a print head cooling device according to the present invention. 2 is a front view of the print head cooling device of FIG. 1; FIG. 3 is an enlarged front view of the print head in the print head cooling device of FIG. 1. FIG. FIG. 4 is an enlarged plan view of the print head in the print head cooling device of FIG. 1. ■...Pipe 2...Print head 3...Heat sink 4...Pump 5...Fan 6...Outer frame 7...Outer frame 9...Radiator section 11...Gap

Claims (1)

[Scope of Claims] A dot impact printer having an electromagnetic print head, comprising: a pipe installed to pass through at least one print head in which a cooling medium is circulated; A print head cooling device for a dot impact printer, comprising: heat exchange means for cooling a cooling medium; and a pump for circulating the cooling medium within the pipe.