JPH0597280A - Paper feeder for color video printer - Google Patents

Abstract

PURPOSE: To prevent the double feeding of a receiver paper to obtain a high quality printer image and prevent the overload of a driving motor to avoid the burning of a motor by providing an abnormal paper feeding detecting means, a receiver paper existence sensing means, a reversed tension paper feeding means, etc. CONSTITUTION: A receiver paper tight contact means 100 which supports a receiver paper 2 fed from a receiver paper cartridge 91 so as to bring the paper 2 into tight contact with a paper feeding base 92 is provided. The abnormal feeding of the receiver paper 2 fed through the means 100 is detected by sensing the thickness of the receiver paper 2 with an abnormal paper feeding sensing means 200. A paper jam preventing means 700 including a reversed tension feeding means 300 is provided to prevent the receiver paper 2 fed to a developing roller 40 from being jammed in the roller 40. When the abnormal paper feeding is detected, a control means 500 controls the reversed tension feeding means 300 so as to apply a reversed tension to the receiver paper 2 when the paper 2 is fed to feed the paper 2 in an opposite direction. With this constitution, the double feeding of the receiver paper can be avoided securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image-receiving paper feeding system for a color video printer, and more specifically, it prevents double-feeding development of image-receiving paper and suppresses jam development to obtain a high quality image. The present invention relates to a sheet feeding device of a color video printer which is capable of obtaining and preventing the image receiving sheet from being wrinkled.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, in a color video printer of a cycolor system, as shown in FIG. 7, a film supply roller 10 for supplying a cycolor film 1 and the cycolor film 1 from the film supply roller 10 are supplied.
A transfer roller 20 for pulling out and transferring the exposure roller 3, an exposure device 3 for exposing the cyclic color film 1 extracted from the transfer roller 202 by a video signal for printing, and a transfer of the cyclic color film 1 exposed by the exposure device 3. Sitsuburu Upper and lower capstan rollers 30: 3
1, 32, an image receiving paper cartridge 91 for storing the image receiving paper 2 of the print paper, and a paper feed roller 80 for transferring the image receiving paper 2 to the traveling path of the color film 1.
A paper feed base 9 for guiding the image receiving paper 2 fed by the paper feed roller 80 to the traveling path of the color film 1.
2, a pair of guides for applying a predetermined pressure to the image receiving paper 2 transferred by the paper feed base 92 and the color film 1 so that the image of the color film 1 is developed on the image receiving paper 2. Upper and lower developing rollers 40:41, 4
2, a take-up roller 50 that winds up the cycolor film 1 that has passed through the developing roller 40, and a heating roller 50 that heat-fixes the image of the image receiving paper 2 separated from the cycolor film 1 through the developing roller 40. A heat fixing unit 60 having a pressure roller 61 and a heat cover roller 62;
It is composed of a plurality of guide rollers 71, 72, 73 which are respectively arranged in the traveling path of the saicolor film 1 and guide the travel of the saicolor film 1.

The operation of the conventional color video printer of the cycolor system constructed as above will be described below. First, the user pulls out the cycolor film 1 from the film supply roller 10, hooks it on the winding roller 50 along the traveling path to form a traveling loop, and then mounts the image receiving paper 2 on the image receiving paper cartridge 91. Then, the preparation for printing is completed. Next, when the operation key of the printer is pressed to start printing, the saicolor film 1 is pulled out from the film supply roller 10 by the moving roller 20, and sequentially passes through the exposure device 3, the cap stun roller 30, and the developing roller 40, and It is wound around the winding roller 50.

In this case, the film supply roller 10
Film 1 from the winding roller to the winding roller 50
In the traveling loop of each of the guide rollers 71, 72,
The color film 1 is guided by 73, and the tension and the transfer speed of the color film 1 are controlled by the cap stun roller 30. In addition, in the exposure device 3, an electric image signal to be printed is converted into an optical image signal, and the silico film 1 is exposed by the optical image signal to form an image.

Next, the image-formed cycolor film 1 passes through the stabilizing roller 72 and the cap stun roller 30, and then the upper developing roller 41.
And the lower developing roller 42. In this case, the image receiving paper 2 is moved by the action of the paper feeding roller 80 along the traveling path of the color film 1 to the upper developing roller 41. Since it passes between the lower developing roller 42 and the lower developing roller 42,
1, 42 for the sai color film 1 and the image receiving paper 2
Each of them receives a predetermined pressure, and the image formed on the color film 1 is developed on the image receiving paper 2.

After that, the color film 1 having passed the developing roller 40 is wound around the winding roller 50, and the image-receiving paper 2 is separated from the color film 1 and transferred to the heat fixing section 60, and the heat fixing section 60 is used. The pressure roller 61 and the heat cover roller 62 of 60 heat-fix the image receiving paper. That is, as shown in FIG. 8, the developing roller 40 has flange members 41, 41b on both sides,
Upper and lower developing rollers 41 having 42a and 42b,
42, the flange members 41a, 41
b, 42a, 42b, upper and lower developing roller 4
Although a gap t having a predetermined gap is constantly maintained between the first and the second portions 42, the gap t is usually larger than the thickness t1 of the cycolor film 1 shown in FIG. It is formed so as to be smaller than the thickness t2 of the image receiving paper 2 shown in FIG.

Therefore, the cycolor film 1 is freely transferred to the inner side of the gap t between the upper and lower developing rollers 41 and 42, but is moved to the inner side of the gap t together with the image receiving paper 2. When transferred, the R, G, and B thyris dye particles applied to the cycolor film 1 are ruptured by the pressure of the upper and lower development rollers 41 and 42 and transferred to the image receiving paper 2 to transfer the cycolor film 1 The image becomes developed.

At this time, the upper and lower developing rollers 41
The pressure of 42 is directly related to the rupture of the dye particles of the color film 1, and the pressure value depends on the gap t between the upper and lower developing rollers 41 and 42, and the color passing through the gap t. Since the thickness t1 + t2 between the film and the image receiving paper is constantly constant, the pressure between the upper and lower developing rollers 41 is influenced by the change in the gap t. Therefore, if the gap t between the upper and lower developing rollers 41 and 42 is not constant, the image receiving paper 2 becomes wrinkled and the image is distorted, and the image receiving paper is fed in double and jams. Development is likely to occur.

[0009]

However, in the sheet feeding device of the conventional color system color video printer having such a structure, the double feeding of the image receiving paper is prevented or the double feeding is detected. However, since there is no device that controls the drive of the printer, the image receiving paper is fed double in the gap between the developing rollers, and excessive pressure is applied to the image receiving paper, causing the image receiving paper to wrinkle and become good quality. There was an inconvenience that the image of was not obtained.

Further, there is a disadvantage that the image receiving paper is narrowed between the upper and lower developing rollers and is not ejected, so that jam development occurs. Further, the upper and lower developing rollers 41.4
There is an inconvenience that the motor for driving 2 is overloaded and damaged. Therefore, as a result of repeated research to solve such problems, the present inventors intend to provide the following paper feeding device for a color video printer.

An object of the present invention is to provide a paper feeding device for a color video printer, which prevents double-fed development of image receiving paper and suppresses the occurrence of jam development to obtain a good quality printer image. It is what Another object of the present invention is to provide a paper feeding device for a printer, which can prevent the overload of the drive motor and prevent the drive motor from being damaged to improve the productivity of the printer. It is a thing.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image receiving paper contact means for closely supporting an image receiving paper fed from an image receiving paper cartridge to a paper feed base, and the image receiving paper contact means. Abnormal paper feed detection means that senses the thickness of the image receiving paper fed through and generates a control signal when the image receiving paper is abnormal, and the image receiving paper fed by the paper feed roller Image receiving paper presence / absence detecting means that is narrowed by the rollers and detects passage, reverse tension roller installed on the paper feeding base to feed reverse tension to the image receiving paper, the image receiving paper presence / absence detecting means and the abnormal paper feeding Control means for controlling the reverse tension roller and the paper feed roller by the control signal of the sensing means so as to supply the reverse tension when the image receiving paper is supplied and to control the image receiving paper to be supplied in the reverse direction at the time of abnormal supply. According to the present invention It is accomplished by configuring the feeder video printer.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the paper feeding device of the color video printer according to the present invention, as shown in FIG. 1, the image receiving paper 2 fed from the image receiving paper cartridge 91 is fed to the paper feeding base 9
Image receiving paper contacting means 100 for supporting so as to adhere to 2,
Abnormal paper feed detecting means 200 for detecting the thickness of the image receiving paper 2 fed through the image receiving paper contact means 100 and generating a control signal at the time of abnormal paper feeding, and the image receiving paper fed to the developing roller 40. When the image receiving paper 2 is fed by the jam occurrence preventing means 700 for preventing the jamming of the image from the developing roller 40 by the developing roller 40, and the control signals of the jam occurrence preventing means 700 and the abnormal paper feeding sensing means 200. By the control means 500 for supplying reverse tension to control the image receiving paper to be fed in the reverse direction at the time of abnormal paper feeding, and the alarm means for issuing an alarm at the time of abnormal paper feeding under the control of the control means 500. It is configured.

The jam occurrence preventing means 700
Is an image receiving sheet presence / absence detecting unit 400 for detecting that the image receiving sheet 2 fed by the sheet feeding roller 80 is nipped by the upper and lower developing rollers 41, 42, and the sheet feeding base 9.
2 and a reverse tension supply means 300 for supplying a reverse tension to the image receiving paper 2. In addition, the image receiving paper contacting means 100 applies a predetermined pressure to the image receiving paper 2 to be fed, and guides the image receiving paper 2 so that the front end of the image receiving paper 2 is transported without wrinkling. 110, elastic means 120 for elastically supporting the pressing means 110, and pivot means 130 for pivotally supporting the pressing means 110.

Further, the abnormal paper feed sensing means 200 is swingably supported by a hinge shaft 213 fixed to the upper printer body of the image receiving paper contact means 100 according to the thickness of the image receiving paper 2 to be fed. The seesaw lever 210 that swings to change the angle, and the image receiving paper cartridge 91.
The seesaw lever 210 is hooked on the upper surface of a fixing plate 240 that is fixed to the printer body at a predetermined distance above the fixing plate 240.
Is constituted by elastic means 230 for elastically supporting the paper upward and abnormal paper feed detection signal generation means 220 for generating a detection signal of the image receiving paper thickness by the swing displacement of the seesaw lever 210.

Further, in the seesaw lever 210, the image receiving paper contacting portion 212 and the moving portion 214 are respectively provided with a predetermined length X. It is formed with Y, and the length X of the image receiving paper contact portion 212 is the interlocking portion 2
It is preferable that the length Y is smaller than the length Y of 14 and the displacement amount of the interlocking portion 214 with respect to the displacement amount of the image receiving paper contact portion 212 is large. A circular ridge 211 is formed at an end portion on the front side of the image receiving paper contact portion 212 of the seesaw lever 210.
When the image receiving sheet 2 is abutted against the image receiving sheet 2, the image receiving sheet 2 is prevented from being galled. In addition, in the abnormal paper feed detection signal generating means 220, a movable piece 221 having a movable contact 222 is pivotally supported by a shaft pin 225 fixed to the upper side of the fixed plate 240, and the movable contact 222 is movable. A fixed contact 223 is provided at a predetermined portion of the upper surface of the fixed plate 240 corresponding to the above, and elastic means (coil spring) for elastically supporting the movable piece 221 upward on the upper surface of the fixed plate 240 adjacent to the fixed contact 223. 224 is hung.

The reverse tension supply means 300 is composed of a pair of rollers, the image receiving paper is sandwiched between the rollers, and the forward / reverse direction transfer force is supplied to the image receiving paper. Further, the control means 500 is
A paper feed motor 530 for rotating the roller of the reverse tension supply means 300 and the paper feed roller 80 in forward / reverse directions, an abnormal paper feed detection signal generation means 220 of the abnormal paper feed detection means 200, and the image reception. Paper presence detecting means 40
A microcomputer 510 for controlling the paper feed, reverse tension and reverse paper feed of the image receiving paper 2 by an output signal of 0; and a paper feed motor drive unit 520 for driving the paper feed motor 530 by the control of the microcomputer 510, It is configured by a rotary power switching unit 540 that shuts off the rotary power transmitted to the paper feed roller 80 during reverse tension paper feed under the control of the microcomputer 510.

As another embodiment of the abnormal paper feed detection signal generating means 220 according to the present invention, as shown in FIGS. 2 and 3, a shield means 250 fixed to the rear end of the seesaw lever 210. The light emitting means 251 may be fixed to both sides of the upper surface of the fixing plate 240 so as to detect the displacement amount of the shielding means 250, and the light receiving means 252 that receives the light of the light emitting means 251. In addition, in the light receiving means 252, a plurality of light receiving elements 1, 2 are provided.
... are arranged at equal intervals, and it is assumed that the thickness of the image receiving paper 2 is 0.12 mm, and the hinge shaft 213 of the seesaw lever 210.
And the distance x from the image receiving paper contact portion 212 to 5 mm, and the distance Y from the hinge shaft 213 to the shielding means 250 is 50.
Assuming mm, the displacement amount of the image receiving paper contact portion 212 and the shielding means 250 with respect to the thickness of the image receiving paper 2 is 1:10, so the displacement amount of the rear side end of the shielding means 250 is 1.2 mm. ..

Therefore, it is preferable to set the arrangement interval of the light receiving elements to about 1 mm. Also, the abnormal paper feed sensing means 2
As another embodiment of No. 00, as shown in FIG. 4, the image receiving paper 2 fed to a predetermined portion on the upper surface of the paper feeding base 92.
It is also possible to install and use the piezoelectric element 260 that changes the voltage depending on the thickness of the. Further, the reverse tension supply means 300
As another embodiment of the invention, as shown in FIG. 2, the reverse tension roller of the reverse tension supply means 300 is replaced with the coil spring 3.
It is also possible to urge and support the image receiving paper feeding base 92 side by 10 and to keep the reverse tension roller pressed to the image receiving paper feeding base 92 side.

In implementing the present invention, the control means 500 uses the control portion 500, the alarm means 600 uses the alarm portion 600, and the reverse tension paper feeding means 300 uses the reverse tension supply roller 300. The image receiving paper contacting means 100 is used as the image receiving paper supporting portion 100.
And the image receiving paper pressure means 110 is a pressure plate 1
10, the pivot means 130 is a hinge shaft 13
0, the light emitting means 251 and the light receiving means 252 respectively use a light emitting element 251 and a light receiving element 252, the shielding means 250 uses a shielding plate 250, and the elastic means 120, 224, 230 respectively A coil spring can be used for each.

The operation of the sheet feeding device of the color video printer according to the present invention thus constructed will be described as follows. As shown in FIG. 1, a cycolor film 1
When the paper feed signal of the image receiving paper 2 is applied to the microcomputer 510 of the control means 500 in the state where the paper feed motor driving unit 52 is being transported on the normal traveling route, the paper feed motor drive unit 52 is driven by the control signal of the microcomputer 510.
0 drives the paper feed motor 530 in the forward direction. Therefore, the image receiving paper feeding roller 80 and the reverse tension roller 300
Rotates in the forward direction, and the image receiving paper 2 on the inner side of the cartridge 91
Is fed to the traveling path of the color film 1 by the guide of the paper feed base 92. In this case, since the front end of the image receiving sheet 2 passes through the image receiving sheet pressing plate 110 elastically supported by the coil spring 120, the image receiving sheet 2 passes without wrinkling, and the front side edge of the image receiving sheet 2 is a seesaw lever. Since the circular protrusion 211 of 210 is pushed, the seesaw lever 210 is swung clockwise around the hinge shaft 213.

When the thickness of the image receiving paper 2 passing through the circular projection 211 of the image receiving paper contacting portion 212 of the seesaw lever 210 is normal, the hinge shaft 213 of the seesaw lever 210 is moved. Although the motion part 214 swings downward in the center, its swing width is small and the movable contact of the movable piece 221 of the abnormal paper feed detection signal generating means 220 has the fixed plate 240 of the abnormal paper feed detection signal generating means 220. Since it is not contacted with the fixed contact 223, the microcomputer 5
10 recognizes that the paper is normally fed, and the image receiving paper 2
Control so that it will be transferred normally. After that, when the feeding of the image receiving paper 2 is completed, the seesaw lever 210 swings counterclockwise around the hinge shaft 213 by the restoring force of the coil spring 230 and returns to the original state.

On the other hand, when the two image receiving papers 2 to be transferred are thick and thick, the swinging width of the seesaw lever 210 becomes large, and the moving part 214 of the seesaw lever 210 causes the abnormal paper feed detection signal generating means 220. The movable contact 221 of the movable piece 221 is brought into contact with the fixed contact 223 and an abnormal paper feed signal is applied to the microcomputer 510, and the microcomputer 510 controls the paper feed motor drive unit 520. The paper feed motor 530 is driven in reverse rotation. Then, the roller of the reverse tension supply means 300 and the paper feed roller 80 rotate in the reverse direction, and the fed image receiving paper 2 is transported in the reverse direction and returned to the original position inside the cartridge 91.

Thereafter, the microcomputer 51
At 0, the image receiving paper 2 is returned to its original position and at the same time the image receiving paper 2 is stopped. Further, when the abnormal paper feed detection signal is applied to the microcomputer 510, the microcomputer controls the alarm unit 600, and the alarm unit 600 displays the abnormal paper feed by the light emitting diode LED or generates the alarm sound by the buzzer. , Informs the user that the paper is abnormally fed.

Further, when the control signal is not generated from the abnormal paper feed detecting means 200 and the normal paper feeding is performed, the microcomputer 510 scans the control signal of the image receiving paper presence / absence detecting means 400 to receive the image receiving paper 2. When the front end of the image forming apparatus starts to pass the developing roller 40, a predetermined reverse tension is applied to the roller of the reverse tension supplying means 300, and the image receiving paper 2 is controlled so as to be transferred without being wrinkled.

Next, while the image receiving paper 2 is passed through the developing roller 40 in a state where a predetermined reverse tension is applied, the image of the color film 1 is printed on the image receiving paper 2, and the printed image receiving paper 2 is printed. The dye is the heat fixing unit 6
When it is 0, the image is thermally fixed to a predetermined hue. That is, as shown in FIG. 6, when the image receiving paper 2 on the inner side of the cartridge 91 is transferred by the image receiving paper feeding roller 80 and is narrowed to the developing rollers 40: 41, 42 after a predetermined time elapses, the control means. The microcomputer 510 of 500 controls the rotation speed and rotation direction of the paper feed motor 530, but the rotation linear velocity V1 of the roller of the reverse tension supply means 300 is made smaller than the rotation linear velocity V2 of the developing roller 40, or the same. Reverse tension is applied to the image receiving paper 2 by reversing the rotation direction.

The image-receiving-paper presence / absence detecting means 400 is installed at the image-receiving sheet discharging portion of the developing roller 400 in order to determine the time when the reverse tension applied to the image-receiving sheet 2 is obtained, as shown in FIG. The image-receiving paper presence / absence detecting means 4
Since 00 has a width of the image receiving paper 2 slightly larger than that of the color receiving film 2, the image receiving paper 2 is placed in a blank portion of the image receiving paper 2 where the color receiving film 2 does not overlap, and the image receiving is performed using an optical sensor or the like. It is designed to easily detect whether or not paper is ejected.

Further, the rollers of the reverse tension supplying means 300 are installed above the image receiving paper feeding base 92 so that the image receiving paper 2 being fed is pinched, and when one roller is used. The roller is biased and supported by the coil spring 310 toward the paper feed base 92 to apply a reverse tension to the image receiving paper 2, and when two rollers are used, they are reversely moved to the image receiving paper 2 by the frictional force of the rollers. Tension is supplied. Further, when reverse tension is supplied to the image receiving paper 2, the microcomputer 510 controls the power switching means 540,
The rotational force transmitted from the sheet feeding roller 80 to the sheet feeding roller 80 is blocked, so that continuous double feeding of the image receiving sheet 2 is prevented.

On the other hand, in the case of using the shielding means as another embodiment of the present invention, as shown in FIGS. 2 and 3, when one sheet of image receiving paper 2 is normally fed, the image receiving is performed. The shield plate 250 descends by the swing width of the image receiving paper contact portion 212 of the seesaw lever 210 corresponding to the thickness of the paper 2, and the shield plate 250 shields the light emitted from the light emitting element 251 to the light receiving element 252 side. Shut off. Therefore, normally, when the thickness of the image receiving paper 2 is 0.12 mm and the paper is fed normally, the shielding plate 250 shields only the first and second light receiving portions of the light receiving element 252, and The received light data is transmitted to the microcomputer 510, and the microcomputer 510 controls the supply motor drive unit 520 so that the image receiving paper feeding roller 80 and the roller of the reverse tension supply means rotate in the same direction as the successive ones. ..

When the image receiving paper 2 is fed in two or more sheets abnormally, the shielding plate 250 swings so much that the shielding plate 250 is the third to the third of the light receiving elements 252. Since four or more light receiving parts are shielded and the received light data is transmitted to the microcomputer 510, the microcomputer 510 judges that the paper is abnormally fed, and the image receiving paper feeding roller 80 and the roller of the reverse tension supply means 300. To rotate the image receiving paper 2 in the image receiving paper cartridge 91.
After returning to the original position on the inner side, an abnormal paper feed warning signal or LED display is given through the alarm unit 600 to notify the user.

When a piezoelectric element is used as another embodiment of the present invention, as shown in FIG. 4, the piezoelectric element 260 is used to detect the thickness of the image receiving paper 2 as a voltage,
The microcomputer 510 compares the voltage of the piezoelectric element 260 with the reference voltage to judge whether or not the abnormal sheet feeding is performed. First, when one sheet of image-receiving paper 2 is normally fed, the piezoelectric element 260 receives a pressure corresponding to the thickness of the image-receiving paper 2, so that a voltage corresponding to the pressure is generated and the voltage is the reference voltage. Therefore, the microcomputer 510 determines that the paper is normally fed, and controls the image receiving paper 2 to be continuously moved. If two or more sheets of image receiving paper 2 are fed abnormally, the thickness of the image receiving paper 2 increases,
Since the output voltage of the piezoelectric element 260 is higher than the reference voltage, the microcomputer 510 determines that the sheet is abnormally fed, and controls the sheet feeding motor 530 to supply the image receiving sheet feeding roller 80 and the reverse tension. By rotating the means 300 in the reverse direction, a warning signal or an LED signal is generated through the alarm section to inform the user of the abnormal paper feeding state of the image receiving paper 2.

[0032]

As described above, in the sheet feeding device of the color video printer according to the present invention, the abnormal sheet feeding means for generating the control signal at the time of the abnormal sheet feeding and the state of the image receiving sheet passing through the developing roller are set. An image receiving paper presence / absence detecting means for detecting,
Since it is composed of a reverse tension paper feeding means for feeding a reverse tension to the image receiving paper and a control means for controlling each of those means, it is possible to prevent the image receiving paper from wrinkling and obtain a high quality screen. This has the effect of preventing the development of jams and preventing damage to the drive motor.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a sheet feeding device of a color video printer according to the present invention.

FIG. 2 is a view showing another embodiment of the sheet feeding device of the color video printer according to the present invention.

FIG. 3 is an explanatory view showing an abnormal paper feed detection signal generating means of another embodiment shown in FIG.

FIG. 4 is a view showing another embodiment of the color video printer paper feeding device according to the present invention.

FIG. 5 is an explanatory view showing an installed state of an image receiving paper presence / absence detecting unit according to the present invention.

FIG. 6 is a drive control flowchart for jam prevention according to the present invention.

FIG. 7 is a configuration diagram of a conventional cycolor system color video printer.

FIG. 8 is a partial front view showing a conventional developing roller.

FIG. 9 is a drawing showing a conventional cycolor film and an image receiving paper, (A) is a drawing showing the thickness of the cycolor film, and (B) is a drawing showing the thickness of the image receiving paper.

[Explanation of symbols]

 1 Cycolor Film 2 Image Receiving Paper 3 Exposure Device 10 Film Supply Roller 20 Transfer Roller 30 Cap Stan Roller 40 Development Roller 41 Upper Development Roller 42 Lower Development Roller 50 Winding Roller 60 Heat Fixing Section 71-73 Guide Roller 80 Paper Feed Roller 91 Image receiving paper cartridge 92 Paper feeding base 100 Image receiving paper contacting means (supporting part) 110 Pressing means (plate) 120 Elastic means 130 Pivoting means 200 Abnormal paper feeding detecting means 210 Seesaw lever 211 Circular ridge 212 Image receiving paper contacting part 213 Hinge shaft 214 Interlocking part 220 Abnormal paper feed detection signal generating means 221 Movable piece 222 Movable contact 223 Fixed contact 224 Elastic means 225 Shaft pin 230 Elastic means 240 Fixed plate 250 Shielding means (plate) 251 Light emitting means (element) 2 52 Light receiving means (element) 260 Piezoelectric element 300 Reverse tension supply means (roller) 400 Image receiving paper presence / absence sensing means 500 Control means (part) 510 Microcomputer 520 Paper feed motor drive part 530 Paper feed motor 540 Power switching means 600 Alarm means ( Part) 700 jam occurrence prevention means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/00 108 J 4226-5C

Claims (14)

[Claims] 1. A paper feeding device for a color video printer, wherein the thickness of an image receiving paper (2) fed from an image receiving paper cartridge (91) is sensed to determine whether or not it is in an abnormal paper feeding state. An abnormal paper feed sensing means (200) for generating a signal and a jam occurrence prevention means for preventing the image receiving paper (2) supplied to the developing roller (40) from jamming on the developing roller (40) ( 700), and a control means (control means for supplying reverse tension to the image receiving paper (2) fed by the control signal generated from the abnormal paper feed sensing means (200) or the jam occurrence prevention means (700) ( 500), and a paper feeding device for a color video printer, which comprises 2. A paper feed device of the color video printer, under the control of the control means (500), an alarm means (60) for notifying a user of an abnormal paper feed state.
0) The sheet feeding device of the color video printer according to claim 1, further comprising: 3. The image-feeding sheet contacting device for supporting the image-receiving sheet (2) fed from the image-receiving sheet cartridge (91) so as to be brought into close contact with the sheet-feeding base (92) in the sheet feeding device of the color video printer. The paper feeding device for a color video printer according to claim 1, further comprising means (100). 4. The image receiving paper contact means (100) applies a predetermined pressure to the image receiving paper (2) fed to the developing roller (40) so that the front end of the image receiving paper (2) is wrinkled. Image receiving paper pressurizing means (110) for guiding the transfer so that the pressurizing means (110) is elastically supported (12).
0) and a pivot means (130) for rotatably fixing the pressurizing means (110), The paper feeding device of the color video printer according to claim 3. 5. The seesaw lever (210) swinging so that the swing angle varies according to the thickness of the image receiving paper (2) to be fed, and the seesaw lever (200). 210) so that the seesaw lever (210) and the lower side fixing plate (240) of the seesaw are supported.
The elastic means (230) hooked on the upper side, and the abnormal paper feed detection signal generation means (220) for generating a detection signal of the image receiving paper thickness according to the swing angle of the seesaw lever (210). The sheet feeding device of the color video printer according to claim 1. 6. The seesaw lever (210) is configured such that the paper feed base (9) is centered around a hinge shaft (213).
2) The image receiving paper contact portion (212) formed with a predetermined length X, and the length X from the image receiving paper contact portion (212) on the opposite side of the hinge shaft (213). The interlocking part (214) formed with a long length Y, and the image receiving paper (2) when contacting the image receiving paper (2) formed at the front end of the image receiving paper contact part (212). The sheet feeding device for a color video printer according to claim 5, further comprising a circular protrusion (211) capable of preventing a galling phenomenon and having a hinge shaft (213) swingably fitted thereto. 7. The abnormal paper feed detection signal generating means (22)
0) is a fixing plate (240) fixed to a predetermined portion of the printer body
The shaft pin (225) is fixed to the upper surface of the
25) a movable piece (221) fitted with a movable contact (222) to be swingable, and projectingly provided at a predetermined portion on the fixed plate (240) corresponding to the movable piece (221). The fixed contact (223), and an elastic means (224) that is hooked to a predetermined portion of the upper surface of the fixed plate (240) so as to elastically support the movable piece (221) in an upward direction. Paper feed device of the described color video printer. 8. The abnormal paper feed sensing means (200) varies the output voltage depending on the thickness of the image receiving paper (2) which is installed on the upper surface of the paper feed base (92) at a predetermined distance and is fed. The sheet feeding device of the color video printer according to claim 1, comprising a piezoelectric element (260). 9. The abnormal paper feed detection signal generating means (22)
0) is a seesaw lever (21) pivotally supported so that the angle of rocking varies depending on the thickness of the image receiving paper (2) to be fed.
0) and a fixed plate (240) fixedly installed at a predetermined position of the printer body.
An elastic means (230) hanging on the upper surface and elastically supporting the seesaw lever (210) in an upward direction; a light emitting means (251) fixed to one side of the upper surface of the fixing plate (240) to emit light; The seesaw lever (2) is fixed adjacent to the light emitting means (251) so as to receive the light of the light emitting means (251).
The sheet feeding device of the color video printer according to claim 1, comprising a light receiving means (252) for sensing the amount of displacement of (10). 10. The abnormal paper feed detection signal generating means (22)
0) is the light emitting means (251) and the light receiving means (25
2) The seesaw lever (210) so that it is located between
The light-receiving means (252) is fixed to the rear end of the light-receiving means (251) according to the displacement amount of the seesaw lever (210), and the light-receiving means (252) can detect an abnormal feeding state of the light-receiving paper (2). 10. The paper feeding device for a color video printer according to claim 9, comprising the shielding means (250). 11. The jam occurrence preventing means (700)
The developing roller (4) by the paper feeding roller (80).
Image receiving paper presence detecting means (400) for detecting that the image receiving paper (2) fed to (0) is fitted into the upper and lower developing rollers (41) and (42) and passes therethrough; (92) The color according to claim 1, further comprising a reverse tension supply means (300) installed on an upper surface and supplying a reverse tension to the image receiving paper (2) fed to the developing roller (40). Paper feeder for video printer. 12. The paper feeding device for a color video printer according to claim 11, wherein the reverse tension supply means (300) is a pair of rollers that are selectively driven. 13. The control means (500) comprises a paper feed motor (530) for rotating the reverse tension supply means (300) and the paper feed roller (80) in forward / reverse directions, and the abnormal feed. Abnormal paper feed detection signal generation means (220) of the paper detection means (200) and the image receiving paper presence / absence detection means (40)
0) output signal to control the feeding of the image receiving paper (2) and the reverse tension and reverse feeding (51)
0), a paper feed motor drive unit (520) for driving the paper feed motor (530) under the control of the microcomputer (510), and the paper feed during reverse tension supply under the control of the microcomputer (510). The sheet feeding device of the color video printer according to claim 1, further comprising: a rotary power switching unit (540) for interrupting a rotary power transmitted to the roller (80). 14. The microcomputer (51
0) is such that the front end of the image receiving paper (2) is the developing roller (4).
0), the linear velocity (V1) of the reverse tension supply means (300) is set to the linear velocity (V) of the developing roller (40).
14. The paper feeding device of the color video printer according to claim 13, wherein the rotation power transmitted to the supply roller (80) is cut off while controlling to rotate smaller than 2) or to rotate in the opposite direction. ..