CN200960768Y - Incline-proof thermal printing unit - Google Patents

Abstract

The utility model relates to a printer member in the office automation equipment, in particular to a thermal-sensitive print unit, which comprises a support, a printing head, a rubber-covered roll and a channel main body, wherein a channel septum is arranged below the printing rubber-covered roll, the utility model effectively solves the problems of the printed paper deviation, crimping and even papers plugging caused by the surface working quality of the rubber-covered roll and the like, thereby achieving the purposes of improving the print quality, and reducing the print faults.

Description

The anti-thermal printing unit that wanders off

Technical field

The utility model relates to the printer unit in a kind of business automation equipment, especially relates to a kind of thermal printing unit.

Background technology

In existing thermal printing unit, extensively adopted the channel form of curved passage.When medium in the bending channel of rubber roll when mobile, the contact area of medium and rubber roll is bigger, reasons such as suface processing quality owing to rubber roll, make the dielectric surface unbalance stress, medium just is easy to laterally move in passage, cause the side of medium crimping even plug paper to occur, influence print quality even print fault occurs.The contact area of medium and rubber roll is big more, and the problems referred to above are just obvious more.Existing thermal printing unit cornerite of medium and rubber roll when printing is all bigger, make that the contact area of medium and rubber roll is generally bigger, therefore have that more serious medium wanders off, problems such as crimping and plug paper, influenced the quality printed and the normal use of PRN device.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned defective, and the contact area of medium and rubber roll was less when a kind of the printing was provided, and can prevent the thermal printing unit that medium wanders off when printing.

The utility model is achieved in that and comprises support, motor, gear drive, compression spring component, printhead, printing rubber roll, channel body, passage partition.The paper feed passage is set between passage partition and channel body.

The anti-thermal printing unit that wanders off described in the utility model is by being provided with a passage partition between printing rubber roll and channel body, the print unit that has significantly reduced bending channel is the cornerite between paper and the rubber roll when printing, reduced the contact area between paper and the rubber roll, effectively solved because problems such as the skew of the print paper that the factors such as suface processing quality of rubber roll cause, crimping even plug paper, thus the purpose that realizes improving print quality, reduces print fault.

Description of drawings

Fig. 1 is the stereogram of the utility model thermal printing unit.

Fig. 2 is the STRUCTURE DECOMPOSITION schematic diagram of Fig. 1.

Fig. 3 is the front view of the utility model thermal printing unit.

Fig. 4 is the A-A cutaway view of Fig. 3.

Fig. 5 is the paper feed channel design schematic diagram of common temperature-sensitive print unit.

Fig. 6 is the paper feed channel design schematic diagram of the utility model thermal printing unit.

The specific embodiment

Shown in Fig. 1,2,3,4, the anti-thermal printing unit that wanders off described in the utility model mainly comprises support 1, motor 2, gear drive 3, printhead 4, compression spring component 5, prints rubber roll 6, channel body 7, passage partition 8.Support 1 is used for installing all parts of print unit, and by it print unit is fixedly mounted among the miscellaneous equipment; Support 1 one sides are provided with handwheel 12 and spanner 9, are used for realizing manually going up paper and get rid of plug paper fault; Printhead 4 is installed on the compression spring component 5, is main print structure; Rubber roll 6 is positioned at the below of printhead 4, and rubber roll 6 rotates under the driving of motor 2 and gear drive 3, drives print paper 10 and moves forward.The below of rubber roll 6 is passage partition 8 and channel body 7, and passage partition 8 two ends embed in the channel body 7, and is supported by channel body 7, forms a narrower slit between passage partition 8 and channel body 7, and this promptly is a paper feed passage 11.Paper 10 arrives between printhead 4 and the rubber roll 6 through paper feed passage 11, and printhead 4 prints predefined print What on paper 10.

The anti-thermal printing unit that wanders off described in the utility model prevents that the principle that print media wanders off is as follows: as shown in Figure 5, the print unit of common bending channel does not have the passage partition between channel body and rubber roll, during printing, print paper is relevant with the paper feed angle with the cornerite size of rubber roll.When paper feed direction was positioned at regional a, paper and rubber roll wrap angle 1 minimum were about 120 °, and paper comes in contact with the outer surface of printing rubber roll about 1/3, and contact area is bigger; When paper feed direction is positioned at regional b, paper and rubber roll cornerite are bigger, therefore the contact area of paper and rubber roll is just bigger, when rubber roll rotates, because the not equal factor of the suface processing quality of rubber roll will cause print paper move left and right in passage, produce crimping even plug paper, influence print quality even print fault occurs.As shown in Figure 6, the utility model is provided with the passage partition 8 of an arc between rubber roll and channel body, and the paper feed passage is set between passage partition and channel body, make the wrap angle 2 between paper and the rubber roll reduce, shape and position according to the passage partition, the cornerite minimum is arrived near 0 degree, and general range is at the 0-120 degree; Cornerite is more little, and the influence that is subjected to the rubber roll suface processing quality is more little.The scope of passage partition extension just is big more, extend to the back lower place of rubber roll from paper inlet, promptly the rubber roll bag rise many more, the area that paper contacts with rubber roll is also just more little, the influence of rubber roll surface quality is also more little, like this with regard to making because the paper that the surface quality of rubber roll causes move left and right in the paper feed passage produces the situation of crimping, plug paper significantly reduces, realize the purpose that prevents that print paper from wandering off with this.

The structure that print paper wanders off that prevents in the utility model not only can be used in the print unit of the foregoing description; also can be used in other various PRN devices by simple variation; as long as meet invention thought of the present utility model, all within protection domain of the present utility model.

Claims (5)

1. the anti-thermal printing unit that wanders off comprises support, printhead, rubber roll, channel body, it is characterized in that printing the rubber roll below passage partition is set.

2. the anti-thermal printing unit that wanders off according to claim 1 is characterized in that between type channel partition and type channel main body the paper feed passage being set.

3. the anti-thermal printing unit that wanders off according to claim 1 is characterized in that passage partition two ends embed channel body, are supported by channel body.

4. the anti-thermal printing unit that wanders off according to claim 1 is characterized in that the passage partition is arranged to arc.

5. the anti-thermal printing unit that wanders off according to claim 4 is characterized in that the arc partition extends to the back lower place of rubber roll from paper inlet.

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