JPH0681747U - Paper transport belt cleaning device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a paper conveyance belt cleaning device capable of automatically removing carbon adhering to the paper conveyance belt from the back surface of the paper. [Structure] A platen 1, a dot impact head 2 which is arranged to face the platen 1 with a predetermined print gap therebetween, a drive pulley 4 driven by a carrying motor 14, and idler pulleys 5 and 6 are wound around the platen 1. An endless sheet conveying belt 3 which is partially inserted between the platen 1 and the dot impact head 2, and the sheet conveying belt 3
Of the tension roller 9 pressed against a part of the outer peripheral surface of the cleaning roller 2 and the cleaning member 2 pressed against the outer peripheral surface of the tension roller 9.
1 is provided, and the carbon adhering to the sheet conveying belt 3 from the sheet 18 is efficiently wiped by the tension roller 9.
Further, the cleaning member 21 removes the carbon wiped by the tension roller 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper transport belt cleaning device used in a printer.

[0002]

[Prior art]

 In general, a dot impact head is often used as a print head in a printer that prints on a plurality of sheets of paper that are coated with carbon on the back side and bound together. Further, when printing a plurality of sheets of paper coated with carbon on the back side, the print density of the lower layer tends to be low. This tendency is particularly strong when printing is performed by stacking a large number of sheets of paper such as 10 sheets. Therefore, the carbon applied to the back surface of the paper has high viscosity and is applied in a thick film.

As described above, in order to print the paper coated with carbon on the back side, the carbon side of the paper is pressed against the feed roller or the paper transport belt by the pinch roller, and the feed roller or the paper transport belt is rotated. There is a printer that conveys paper by doing so, and prints with a dot impact head during the conveyance process.

[0004]

[Problems to be solved by the device]

 In the method of conveying the paper coated with carbon by the feed roller and the pinch roller, the feed roller comes into contact with the carbon surface of the paper many times because the circumference of the feed roller is short. As a result, a large amount of carbon adheres to the outer circumference of the feed roller. The carbon adhering to the feed roller adheres to the pinch roller when there is no paper. Therefore, when the paper is fed, the carbon on the pinch roller is transferred to the print surface (front surface) of the paper, which causes the print surface of the paper to There is a problem that it gets dirty.

When the carbon-coated paper is carried by the paper carrying belt and the pinch roller, the carbon of the paper is dispersed and adheres to the paper carrying belt because the circumference of the paper carrying belt is long. . As a result, carbon does not adhere to the paper transport belt as much as the feed roller does, but it remains dirty with carbon. The carbon adhering to the paper conveyance belt adheres to the pinch roller as described above, and the carbon on the pinch roller adheres to the printing surface of the paper.

Therefore, it is necessary to clean the feed roller, the paper transport belt, the pinch roller, etc., but the cleaning is done by wiping with alcohol or scraping off with a spatula, and the work is very troublesome. .

[0007]

[Means for Solving the Problems]

 According to the present invention, a platen, a dot impact head facing a platen with a predetermined printing gap, a drive pulley driven by a conveyance motor, and an idler pulley are partially wound around the platen. An endless paper conveyance belt inserted between the platen and the dot impact head, a tension roller pressed against a part of the outer peripheral surface of the paper conveyance belt, and a pressure contacted with the outer peripheral surface of the tension roller. And a cleaning member.

[0008]

[Action]

 The paper transport belt always contacts the tension roller during one rotation, but the tension roller is pressed against the paper transport belt in order to apply tension to the paper transport belt. As a result, the peripheral speed tends to decrease due to the resistance caused by the resistance, so that the wiping action of carbon on the paper transport belt is promoted. As a result, the carbon adhering to the paper transport belt is efficiently and automatically wiped off by the tension roller. Carbon that adheres intensively to the tension roller is cleaned by the cleaning member, so the carbon wiped by the tension roller is maintained for a long time.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a platen 1 and a dot impact head 2 which is arranged to face the platen with a predetermined printing gap therebetween are provided. A paper transport belt 3 passing between the platen 1 and the dot impact head 2 is wound around a drive pulley 4 and a plurality of idler pulleys 5, 6. The inner circumference of the sheet conveying belt 3 is supported by a plurality of supporting rollers, and the outer circumference is pressed against the idler pulley 6 or a plurality of pinch rollers 8 facing the supporting rollers 7. Further, a tension roller 9 is pressed against a part of the outer circumference of the paper transport belt 3. Further, a pinch belt 10 is provided on the outer circumference of the idler pulley 5 in pressure contact with the paper transport belt 3. The pinch belt 10 is wound around a plurality of idler pulleys 11, and tension is applied by a tension roller 13 held by a tension arm 12.

A timing belt 16 is wound around the platen 1, the drive pulley 4, and the motor pulley 15 driven by the carry motor 14, and a plurality of tension rollers 17 are provided around the timing belt 16. Pressed. Further, a sensor 19 for detecting the paper 18 conveyed by the paper conveyance belt 3 is provided near the dot impact head 2.

Further, a press roller 20 that faces the tension roller 9 and supports the inner peripheral surface of the sheet conveying belt 3 is rotatably provided. Thus, the cleaning member 21 made of a soft material such as felt is provided. As shown in FIG. 2, the cleaning member 21 is pressed against the tension roller 9 by the pressing body 22.

With such a configuration, when the carry motor 14 is driven counterclockwise in FIG. 1, the timing belt 16 rotates counterclockwise together with the platen 1 and the drive pulley 4. Further, the paper transport belt 3 is driven by the drive pulley 4 and rotates counterclockwise. Therefore, when the paper 18 is inserted between the paper transport belt 3 and the pinch roller 8 on the idler pulley 6, the paper 18 is transported to the left, and when the leading edge of the paper 18 is detected by the sensor 19, the detection is performed. The signal causes the carry motor 14 to be temporarily stopped. In this way, the position of the leading edge of the paper 18 is determined, the carrying motor 14 is then restarted counterclockwise, and the paper 18 is printed by the dot impact head 2 in the process of being carried to the left.

Here, when the paper 18 having the lower surface coated with carbon is used, the carbon of the paper 18 adheres to the outer periphery of the paper transport belt 3. On the other hand, the paper transport belt 3 always contacts the tension roller 9 during one rotation. The tension roller 9 is pressed against the paper conveyance belt 3 to apply tension to the paper conveyance belt 3, and the paper conveyance belt 3 is sandwiched between the press roller 21 and the tension roller 9. Due to the cleaning member 21, the tension roller 9 receives resistance in the rotation direction, and the peripheral speed tends to decrease. That is, the tension roller 9 tends to rub the sheet conveying belt 3. As a result, the carbon adhering to the paper transport belt 3 is efficiently and automatically wiped off by the tension roller 9. Since the carbon that intensively adheres to the tension roller 9 is cleaned by the cleaning member 21, the wiping action of carbon by the tension roller 9 is performed for a long time. However, since the carbon on the paper transport belt 3 can be removed only by pressing the cleaning member 21 against the tension roller 9, the structure can be simplified and the cost can be reduced.

[0014]

[Effect of device]

 According to the present invention, as described above, the cleaning member is brought into pressure contact with the outer peripheral surface of the tension roller that applies tension to the paper transport belt, so the paper transport belt always contacts the tension roller during one rotation, but the tension roller does not In order to apply tension to the paper transport belt, it is pressed against the paper transport belt, and the tension roller receives a resistance in the rotation direction due to the cleaning member, which tends to lower the peripheral speed. The upper carbon wiping action is promoted, which allows the carbon adhering to the paper transport belt to be efficiently and automatically wiped by the tension roller, and the carbon adhering intensively to the tension roller can be cleaned. Since it can be cleaned by the member, the carbon wiped by the tension roller can be performed for a long time. It can, moreover, only to press the cleaning member to the tension roller, it is possible to remove carbon on the paper conveying belt, simplified turned into a structure, an effect such as a cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part.

[Explanation of symbols]

 1 Platen 2 Dot Impact Head 3 Paper Conveyor Belt 4 Drive Pulley 5, 6 Idler Pulley 9 Tension Roller 14 Conveyor Motor 21 Cleaning Member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hisao Suzuki Hisashi Suzuki, 570, Ohito, Ohito-cho, Takata-gun, Shizuoka Tokyo Electric Co., Ltd. Ohito factory (72) Creator Akira 570, Ohito, Ohito-cho, Shikata-oka, Tokyo Denki Inside Ohito Plant (72) Creator Tsuguo Narushima 570 Ohito, Ohito Town, Takata-gun, Shizuoka Prefecture

Claims (1)

[Scope of utility model registration request] 1. A platen, a dot impact head which is arranged to face the platen with a predetermined printing gap, and a drive pulley and an idler pulley which are driven by a conveyance motor, and are partially wound around the platen. An endless sheet conveying belt inserted between the platen and the dot impact head, a tension roller pressed against a part of the outer peripheral surface of the sheet conveying belt, and a cleaning member pressed against the outer peripheral surface of the tension roller. A paper transport belt cleaning device comprising: