JPH0452166A - printing device - Google Patents

Abstract

PURPOSE:To make air in a case circulate by movement of a carriage and to cool a printing head therewith by a method wherein a plate member is installed to the carriage that moves the printing head mounted thereon so that the direction in which the carriage travels is intersected by the plate member. CONSTITUTION:Printing is made with a printing head 1 that is driven with a carriage 5 that travels in reciprocation in an air channel. A piston member 31 is made of a flat plate in a shape approximately the same as the sectional shape of the air channel, and travels in reciprocation together with the carriage 5 as it is fixed to the carriage 5 with screws that are inserted through fixing holes 31c. When the carriage 5 travels in one direction, hot air in the air channel is exhausted by effect of the piston member 31 toward the direction of the travel and, at the same time, air on the outside of a case of a printing device is sucked into the air channel from the side opposite to the direction of the travel.. When the carriage 5 travels in the opposite direction, the exhaust and the suction are made likewise. Ventilation in the air channel is made as mentioned above by reciprocating travels of the carriage 5, and thereby the printing head 1 can be cooled down.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to cooling of a printing section of a printing device.

Conventional technology Conventionally, the print heads of printing devices such as typewriters and wire dot printers use solenoids to drive hammers, wires, etc., but when printing with a high printing rate, the temperature of the print head rises due to the heat generated by the solenoid. Therefore, the printing operation had to be stopped to protect the print head.

Particularly in recent years, the degree of sealing of the outer case has become higher due to the need to reduce the printing noise generated by hammers, wires, etc. hitting the platen during printing, and this has become increasingly disadvantageous for cooling the print head. It has become to.

A conventional printing device will be described below.

FIG. 8 is a schematic diagram of a conventional printing device.

In FIG. 8, 1 is a print head equipped with a plurality of solenoids for driving print wires, 4 is an ink ribbon cassette containing an ink ribbon, and 5 is a carriage on which the print head 1 and the ink ribbon cassette 4 are placed. It moves using the carriage shaft 6.7 as a guide. 2 is a cylindrical platen that receives the impact of the print head l, and the paper 3
We also carry out transportation. Here, the platen 2 may have a circular shape, or it may have a flat bar shape if the paper 3 is conveyed by another means. A pail roller 10 urges the paper 3 toward the platen 2, and is rotatably held around a detail 10a. Reference numeral 12 designates a flat paper press plate, and its tip is in close contact with the platen 2 without any gaps.

A paper guide member I3 guides the paper 3 to the platen 2 and closes the lower part of the platen 2 late. 8 (two-dot chain line) is a chassis side plate fixed to the chassis base 44, and supports the platen 2 and the carriage shaft 6.7 in parallel. 40c via vibration isolating rubber 25. A fan 43 cools the print head 1 and is attached to a shirt base 44. Ventilation holes 44a and 40a are formed in the chassis base 44 at the upper part of the fan 43 and the lower case 40 at the lower part. 4] is an upper case having an opening formed on its upper surface, and the opening is covered by an upper cover 42.

The operation of the printing device configured as described above will be described below.

The paper 3 is guided by the paper guide member 13 and inserted between the platen 2 and the print head l along the outer periphery of the platen 2.
By driving the print head 1 or the print wire with a solenoid, an ink printer (not shown) makes dots on the recording paper 7 and a printing operation is performed. During this printing operation, the temperature of the print head 1 rises due to the heat generated by the solenoid, or the fan 43 or the ventilation holes 44a, 40
a to cool the print head 1.

Problems to be Solved by the Invention However, in the earlier conventional configuration, a fan 43 for cooling the print head 1 is provided, which increases the cost and has the problem of generating noise due to the wind noise of the fan 43. was.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a carriage on which a print head is placed and for moving the print head, including a plate member provided in a direction transverse to the moving direction of the carriage.

Function: With the above-described configuration, the present invention can circulate the air inside the housing as the carriage moves.

Embodiment FIG. 1 is a perspective view of a printing device in an embodiment of the present invention.
FIG. 2 is a perspective view of a printing device in one embodiment of the present invention. 1 and 2, l is a print head, 2 is a platen, 3 is paper, 4 is an ink ribbon cassette, 5 is a carriage, 6.7 is a carriage shaft, 8 is a chassis side plate, 10 is a paper press roller, 10a Reference numeral 12 indicates a shaft portion, 12 indicates a paper holding plate, 13 indicates a paper guide member, and 25 indicates a vibration isolating rubber. These components are the same as those of the conventional example shown in FIG. 8, and detailed explanation thereof will be omitted. Reference numeral 9 denotes a shaft base that supports the palm side plate 8, and the lower case 21 is attached to the boss 21c via a vibration isolating rubber 25. The lower surface of the printing section constituted by the print head 1 and the platen 2 has a double structure with the chassis base 9, ribs 21a and 21b, and the lower case 21. Reference numeral 22 denotes an upper case, which has a double structure on the front surface of the printing section with ribs 22a and ribs 2+a. Reference numeral 23 denotes an upper cover, which has a double structure on the upper surface of the printing section together with the inner layer 23a.

A sound absorbing material 24 is arranged around the printed portion.

Reference numeral 11 denotes a roller cover, which is biased toward the inner 23a by a spring (not shown) using the shaft portions 10a at both ends of the paper pressing roller 10 as spindles, and is in close contact with the inner 23a. Reference numeral 30 includes the platen 2 as a part, a paper press roller IO, a roller cover 11, an inner 23a, and a rib 2.
2a, a rib 21a, a chassis base 9, and a paper press plate I2. Furthermore, since a sound absorbing material is pasted around the wind barrel 30, the soundproofing properties are improved. Reference numeral 31 denotes a piston member, as shown in FIG. 3, which is a flat plate having an outer shape substantially the same as the cross-sectional shape of the wind cylinder 30, and is screwed to the carriage 5 through a mounting hole 31c.

The operation of the printing apparatus configured as described above will be explained below. Here, since everything other than the operation of the piston member 3I is the same as the conventional one, detailed explanation will be omitted. Printing is performed by driving the print head l while the carriage 5 reciprocates within the wind cylinder 30, or by driving the print head l by the piston member 3.
1 is also fixed to this carriage 5, so it moves back and forth with the carriage 5, and when the air inside the wind cylinder travels in one direction with the carriage 5 as shown in Figure 4, it travels through the high temperature air inside the wind cylinder. While exhausting in the direction, the piston member 31
On the opposite side of the travel direction, air outside the case is sucked into the wind barrel. When the carriage 5 travels in the opposite direction, air intake and exhaust air are similarly carried out. As the carriage 5 travels in this manner, air is exchanged within the wind cylinder and the print head 1 is cooled.

In addition, in one embodiment of the present invention, the piston member 31 is connected to the wind barrel 3.
As shown in FIGS. 5 and 6, a ventilation hole 32a is formed in the piston member 32, and the valve member 33 is inserted into the ventilation hole 32a through the hinge 3.
4 and the pin 35 so that it can be opened and closed,
As shown in FIG. 7, when the carriage 5 travels in a direction that closes the valve member 33 or the ventilation hole 32a due to wind pressure, the high-temperature air inside the wind cylinder 30 is exhausted in the traveling direction, and the piston member 3
On the opposite side of 2, air outside the case is sucked into the wind barrel 30. When the carriage 5 moves in the direction in which the valve member 33 opens due to wind pressure, the ventilation hole 32a is not blocked, so that almost no air is taken in or exhausted from the wind cylinder 3o. Due to the action of the valve member 33, the air inside the wind cylinder 30 is caused to flow in one direction, the air is replaced, and the print head 1 is cooled.

Effects of the Invention In the present invention, the carriage on which the print head is placed and the print head is moved is provided with a plate member provided in a direction transverse to the moving direction of the carriage, thereby circulating the air inside the housing as the carriage moves. This makes it possible to cool the print head.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main parts of a printing device according to an embodiment of the present invention, FIG. 4 is an enlarged view of the main parts of a printing device according to another embodiment of the invention, and FIG. FIG. 8, which is an explanatory diagram of the operation of a printing device according to another example of the present invention, is a schematic configuration diagram of a conventional printing device. 1... Print head, 2... Platen,
5... Carriage, 21... Lower case, 22...
Old upper case, 23. Group upper cover, 31...
... Piston member, 32 ... Piston member, 3
3... Name of Benchi's agent Patent attorney Military Manabu Awano Haka] Name Figure Figure Figure Figure 32α

Claims (2)

[Claims] (1) a print head, a carriage on which the print head is placed and moves the print head, a platen provided at a position facing the print head along the moving direction of the carriage, the print head and the carriage; and the platen, and further comprising a plate member provided on the carriage in a direction transverse to a moving direction of the carriage. (2) The printing device according to claim 1, wherein the plate member is provided with an opening, and the plate member is provided with a valve member that covers the opening.