KR950000415B1 - Image forming apparatus in led printer - Google Patents

Abstract

The device easily removes the process unit, and holds the gap between the LED head array and the development drum. The device includes the elastic means (5) which is installed between LED frame (3) and upper main body (2), the pressured spring (5a) which is installed in the bolt hole (4a) between LED frame (3) right upper hole (3a) and LED head array (4) upper hole, the LED position unit (12') which is installed on the both sides of housing (12), and the gap (G) which exactly holds a constant distance between development drum (11) and LED head array (4).

Description

Image forming apparatus of LED printer

1 is a schematic diagram of a conventional image forming apparatus.

2 is an exploded perspective view of the image forming apparatus of the present invention.

3 is a schematic view in which the image forming apparatus of the present invention is installed.

4 is a side view of the present invention assembled.

5 is a main action diagram of the present invention.

6 is a schematic diagram of an image forming apparatus of another embodiment.

7 is the main action of FIG.

8 is a state in which the elastic means is installed in the LED frame of the present invention.

* Explanation of symbols for the main parts of the drawings

1: lower body 2: upper body

3: LED frame 3 ': lever

3a: hole 4: LED head array

4a: bolt hole 4b: end

5: elastic means 5a: compression spring

6: Process Unit 7: Tip

8: hinge 11: photosensitive drum

12: housing 12 ': LED positioning unit

13: bolt 28: pivot

29: slope

The present invention relates to an image forming apparatus using an electrophotographic, and in particular, when the LED unit is removed to replace the process unit of the LED printer, the LED frame with the LED head array is automatically moved to the top to protect the LED head array and mounting the process unit The LED head array is moved downward to maintain the exact distance from the drum.

In the conventional image forming apparatus of the LED printer, when print data is input from a computer (not shown) as shown in FIG. 1, a control circuit inside the recording apparatus operates the LED head array 4 to be exposed to light by a light source. It exposes on the drum 11.

The photosensitive drum 11 is initially charged because the potential of the photosensitive drum 11 exposed by the exposure apparatus using the LED head array 4 on the surface of the photosensitive drum 11 in a state of being charged by a constant voltage. The potential difference with the potential is generated so that an invisible electrostatic latent image is generated on the photosensitive drum 11.

Thereafter, as the photosensitive drum 11 rotates, the toner of the developing unit 15 is transferred onto the electrostatic latent image of the photosensitive drum to change into a visible image.

On the other hand, the paper supplied from the paper feeding device 16 is aligned with the register roller 17 and then transported to the transfer unit 18. At this time, the toner is transferred to the paper on the photosensitive drum 11, whereby transfer is performed. Lose.

Subsequently, the paper attached to the photosensitive drum by the electrostatic force of the photosensitive drum 11 is separated by the separator 19 and transferred to the fixing unit 21 by the conveying belt 20 to heat and compress the rollers 23 of the heat roller 22. The toner is fixed to the paper by the pressure of) and is conveyed to the discharge tray side.

At this time, the remaining toner remaining on the photosensitive drum 11 is wiped by the cleaning device 24 and sent to the waste toner collecting container through the ogre 25, and the vertex latent image is exposed to light irradiated from the latent image removing lamp 26. The latent image is removed.

In the electrophotographic process that operates as described above, when the paper is jammed during operation, the lower body 1 of the upper body 2 is separated along the paper conveying path, so the upper body 2 is placed on the upper side of the hinge 27. It is easy to open and remove the jammed paper.

Meanwhile, the lower main body 1 is provided with paper feeding means, fixing means, transfer means, and the like, and the upper main body 2 has a cleaning device 24, a photosensitive drum 11, a developing device 15, and a charger 14. Is composed of a single process unit 6 has a space to be accommodated and the frame (3) is installed on top of the hinge (8) with the LED head array (4) installed on the top is assembled to be closed.

If the process unit 6 is to be replaced in the above state, open the upper body 2 and press the lever 28 around the hinge 8 of the frame 3 on which the LED head array 4 is installed. When the 29 is released from the locking pin 30 formed on the upper body 2, the frame 3 is opened upward by hand, and the process unit 6 is pulled out to one side on the unit guide 9 to be separated.

In this state, when the process unit 6 is mounted, the process unit 6 is pushed into the unit guide space and the frame 3 on which the LED head array 4 is installed is centered on the hinge 8. When moved downward, the locking jaw 29 formed on the lever 28 is caught and fixed to the locking pin 30 formed on the upper body 2, and at this time, the LED head array 4 is connected to the upper hole of the unit guide 9. 10) is to be mounted so as to maintain the distance to the photosensitive drum (11) accurately.

As a means of forming an electrostatic latent image on the photosensitive drum in the electrophotographic process of a conventional LED printer, the process unit is opened from the main body by opening the upper body when opening the process unit and opening the frame with the LED head array installed using the lever by hand. When detaching and mounting, there are many troublesome problems by attaching the process unit and pressing by hand the frame on which the LED head array is installed.

The present invention has been made to solve the above problems and can easily remove the jammed paper in the LED printer, and when the processor unit is removed, the LED frame is automatically installed on the resilience of the spring is the LED frame array It is an object of the present invention to move to the top by the process unit can be easily removed and mounted in one operation easily.

Another object of the present invention is to maintain a constant gap between the LED head array and the photosensitive drum installed in the LED frame when mounting the process unit.

An embodiment for achieving the above object will be described in detail with reference to the accompanying drawings.

First, the configuration of the present invention will be described with reference to FIGS. 2 and 3 so that the LED frame 3 bent to the upper body 2 of the LED printer, which is detachable from the lower body 1 and the upper body 2, is rotated. A hinge 8 is formed at the center, and a bolt is installed so that the compression spring 5a is installed between the hole 3a formed on the upper right side of the LED frame 3 and the bolt hole 4a on the upper part of the LED head array 4. 13) is fixed to the bolt hole (4a) through the hole (3a), the LED head array (4) side of the LED frame 3 is rotated upward and the LED frame (3) and the upper body (to have a restoring force) 2) between the elastic means (5) is installed and the process unit (6) is mounted inside the hole (10) formed on the top of the unit guide (9) where the upper end (7) portion of the process unit (6) is bent The upper side of the housing 12, which is in contact with the lower lever portion 3 'of the LED frame 3, and on which both ends 4b of the LED head array 4 are provided with the photosensitive drum 11 The gap G between the lower end of the LED head array 4 and the surface of the photosensitive drum 11 in the process unit 6 by being in close contact with the LED positioning portion 12 'by the compression spring 5a force. It is installed to keep accurate.

The elastic means 5 installed between the LED frame 3 and the upper body 2 is the LED head array 4 side of the LED frame 3 is rotated upward and the upper and upper LED frame 3 to have a restoring force. A tension spring can be connected between the main bodies 2, and as shown in FIG. 8, a torsion spring, which is an elastic means 5, is installed at the hinge 8 of the LED frame 3 so that one end of the torsion spring is provided. Silver is fixed to the LED frame (3) and the other end is fixed to the upper body (2) can be used to install the spring force to have a restoring force to rotate the LED frame (3) upward, the tension spring that is the elastic means (5) And torsion springs can be used by installing the LED frame 3 and the upper body at the same time.

The gap G between the bottom lens portion of the LED head array 4 and the surface of the photosensitive drum 11 is a focal length of the LED head, which is typically about 4-6 mm depending on the LED head.

In addition, an important point in print quality is the accuracy of the gap G and the parallelism between the left and the right. The distance from the centerline of the photosensitive drum 11 to the positioning portion 12 'on the upper part of the housing 12, as in the fourth degree, If A and A 'in the right and left, respectively, A = A' is managed so as to maintain parallelism and the dimensional precision of A and A '.

Effects of the present invention configured as described above are as follows.

When the paper is jammed during the use of the LED printer, open the upper body (2), which is separated along the path by paper feed, remove the paper, close the upper body (2), use it, and replace the process unit (6). Open the (2) and pull out the processor unit 6 to one side. With the lever 3 'of the LED frame 3 centering on the hinge 8, the LED frame ( 3) the hole 3a of the LED frame 3 because the LED frame 3 installed about the hinge 8 is rotated counterclockwise by the restoring force of the tension spring or the torsion spring, which is the elastic means 5 installed in the 3). The photosensitive drum 11 is moved as the LED head array 4 is moved upward by the bolt 13 installed at the center so that the compression spring 5a is fixed to the bolt hole 4a of the LED head array 4 through the through hole. LED positioning part on the installed housing 12 and LED head at 12 ' When both ends 4b of the ray 4 are in close contact with each other, the LED head array 4 moves upward in the hole 10 above the unit guide 9 and the lever part 3 'moves downward. The process unit 6 can be separated in the unit guide 9 as a third degree.

When the process unit 6 is inserted into the unit guide 9 of the upper body 2 in order to mount the process unit 6 in the above state, the upper end 7 of the process unit 6 becomes the LED frame ( 3) the spring of the elastic means (5) installed on the LED frame (3) centered on the hinge (8) while being pushed and mounted to the upper portion of the lever (3 '), the LED head array (4) is installed Move downwards and both ends 4b of the LED head array 4 to the LED positioning portion 12 ′ above the housing 12 of the photosensitive drum 11 through the hole 10 of the unit guide 9. ) Abuts the gap G between the lower end of the LED head array 4 and the photosensitive drum 11, wherein the LED head array 4 is led around the bolt 13 by the LED frame 3. And a compression spring (5a) installed between the and the LED frame (3) is elastically pushed down and pushes the lower LED head array (4) downward The gap G between the lower end of the lens portion of the LED head array 4 and the surface of the photosensitive drum 11 is accurately maintained, and the process unit 6 is mounted on the upper body 2 together with the fourth and fifth degrees. will be.

According to the present invention as described above, when the paper is jammed inside the main body, the upper body can be easily opened and the paper can be easily removed. When replacing the process unit, pulling the process unit to the right in the unit guide lowers the LED frame which is in contact with the upper end of the unit. The LED head array installed on the inside is automatically moved to the upper part in the unit guide to separate the process unit in one operation to protect the LED head array.When mounted, the LEDs of the housing where the lower ends of the LED head array are installed with a photosensitive drum Since it comes in contact with the positioning unit, there is an advantage that the gap between the photosensitive drum and the LED head array can be kept constant at all times.

As another embodiment, the configuration will be described with reference to FIGS. 6 and 7 as follows.

Pivot 28 is formed on the lower body 1 of the LED printer in which the lower body 1 and the upper body 2 are separated along the paper conveying path so that the upper surface forms the inclined surface 29 to the left and the upper body 1 A hole 3a is formed in the LED frame 3 so as to form a hinge 8 at the center of the LED frame 3 bent at the bottom, and to fix the LED head array 4 at the lower right. Bolt holes 4a are formed on both sides of the upper part, and a compression spring 5a is installed between the LED frame 3 and the LED head array 4, and the holes 3a and the compression springs of the LED frame 3 are provided with bolts 13. It is fixed to the bolt hole 4a of the LED head array 4 through 5a, and the LED head array 4 side of the LED frame 3 rotates upward and has a restoring force so that the LED frame 3 and the upper body have a restoring force. (2) is installed between the elastic means (5) and the lever part (3 ') of the left side of the LED frame (3) is installed to guide the inclined surface 29 of the pivot 28 and the LED head Both sides of the lower end of the ray 4 are connected to the LED positioning portion 12 'on the housing 12 in which the photosensitive drum 11 is installed through the hole 10 in the upper portion of the unit guide 9. It is installed so that the gap G between the bottom of the LED head array 4 and the surface of the photosensitive drum 11 in the process unit 6 is accurately maintained.

The elastic means (5) can be used to install a tension spring connected between the LED frame (3) and the upper body (2) as described in the present invention so that the LED head array (4) side is rotated upward and has a restoring force. As shown in FIG. 8, a torsion spring, which is an elastic means 5, can be installed and used on the hinge 8 of the LED frame 3.

Referring to the operation and effect of another embodiment configured as described as follows.

When the paper jam occurs during the use of the LED printer, and when the process unit 6 is to be replaced, the upper body 2 is opened, and the LED frame 3 is placed on the inclined surface 29 of the pivot 28 installed on the lower body 1. As the lever part 3 'of the guide is moved upward, the right side of the LED frame 3 is centered on the hinge 8 by the restoring force of the tension spring or the torsion spring, which is an elastic means 5 installed on the LED frame 3. The upper head of the unit guide 9 has an LED head array 4 installed at the bottom so that the compression spring 5a is fixed by the bolt 13 fitted through the hole 3a of the LED frame 3 as it is moved upward. The process unit is moved away from the upper side in the state in which both ends of the LED head array 4 are coupled to the LED positioning portion 12 'on both sides of the housing 12 in which the photosensitive drum 11 is installed. (6) can be removed from the unit guide (9) to the right as shown in figure 6. will be.

In the above state, in order to mount the process unit 6 into the unit guide 9 of the upper body 2, the process unit 6 is inserted into the unit guide 9 and then pushed in. When the upper body 2 is closed by pressing the lower body 1 toward the lower side, the lever part 3 'of the LED frame 3 abuts the upper side of the inclined surface 29 of the pivot 28 installed on the lower body 1. When the upper body 1 is pressed further in the state, the lever part 3 'is moved to the left along the inclined surface 29, and is moved to the lower side of the inclined surface 29 so that the LED frame is interlocked about the hinge 8. The LED head array 4 fixed to the bolt 13 on the right side of the upper part 3 is rotated downward so that the upper part of the housing 12 installed in the photosensitive drum 11 through the hole 10 in the upper part of the unit guide 9 is provided. Since both end portions 4b of the LED head array 4 abut on both LED positioning portions 12 ', the LED head array 4 A gap G is formed between the bottom of the photosensitive drum and the photosensitive drum 11, and a compression spring installed between the LED head array 4 and the LED frame 3 around the bolt 13 by the LED frame 4 is formed. The lower portion of the LED head array 4 and the surface of the photosensitive drum 11 in the process unit 6 are prevented from being pushed downward so that the portion 5a is resilient and pushes down the LED head array 4 downward. The gap G is maintained accurately, and the tension spring, which is an elastic means 5 installed on the LED frame 3, is tensioned, is kept in an extended state, and is mounted with a seventh degree so that the state of the LED printer can be used. Will be.

Therefore, according to the present invention, if the upper body is separated from the lower body, the LED head array is rotated to the upper by the restoring force of the spring, which is an elastic means installed in the LED frame, so as to escape from the unit guide, and protect the LED head array, the process unit The lower and lower sides of the LED head array come into contact with the LED positioning part on the upper part of the housing where the photosensitive drum is installed so that the gap between the photosensitive drum and the LED head array can be kept constant. The separation along the furnace has the advantage that the paper can be easily removed when the paper is jammed.

Although the embodiment of the present invention has been described as being used in a printer, it can be used in a simulated transmitter by installing a transmitter for a simulated transmitter on the upper body and using a device other than that as a reception printing apparatus of the simulated transmitter.

Claims (7)

In the image forming apparatus of the LED printer in which the lower body 1 and the upper body 2 can be separated along the paper feed path, the hinge 8 is attached to the upper end 7 of the process unit 6 mounted on the upper body 2. In the upper right side of the LED frame 3 so that the lever part 3 'of the LED frame 3 rotated about the abutment and the LED head array 4 is installed at the lower right side of the LED frame 3. A compression spring 5a is installed between the hole 3a and the upper part of the LED head array 4 to form the bolt hole 4a. The bolt 13 is fixed to the bolt hole 4a through the hole 3a. The LED head array 4 side of the LED frame 3 is rotated upward and elastic means 5 is installed between the LED frame 3 and the upper body 2 so as to have a restoring force. The lower end portion 4b of the lower side portion 4b is brought into close contact with the LED positioning portion 12 'on both sides of the housing 12 in which the photosensitive drum 11 is installed. The image forming apparatus of the LED printer, characterized in that installed so that the gap (G) between the rum (11) and the bottom of the LED head array (4) is correctly maintained. The spring according to claim 1, wherein the elastic means (5) is fitted with a torsion spring to the hinge (8) of the LED frame (3) so that the LED head array (4) side of the LED frame (3) is rotated upward and has a restoring force. One end is fixed to the LED frame (3), the other end is the image forming apparatus of the LED printer, characterized in that the fixed to the upper body (2). According to claim 1, wherein the elastic means (5) is tensioned between the upper side of the LED frame 3 and the upper body (2) so that the LED head array 4 side of the LED frame (3) is rotated upward and has a restoring force Image forming apparatus of the LED printer, characterized in that by connecting the spring. In the image forming apparatus of the LED printer in which the lower body 1 and the upper body 2 are separated along the paper feed path, the hinge 8 is attached to the upper end 7 of the process unit 6 mounted on the upper body 2. The lever part 3 'of the LED frame 3 rotating about the abutment, and the LED head array 4 is fixed by fixing means to be installed at the lower right side of the LED frame 3, and the LED array 4) the side is rotated upward and the elastic means (5) is installed between the LED plane (3) and the upper body (2) to have a restoring force, and both lower end portions (4b) of the LED head array (4) is a photosensitive drum ( Image of the LED printer characterized by the positioning means such that the gap G between the photosensitive drum 11 and the LED head array 4 in the processor unit 6 is kept in close contact with the housing 12 in which the 11 is installed. Forming device. In the image forming apparatus of the LED printer in which the lower main body 1 and the upper main body 2 can be separated along the paper conveying path, a pivot 28 is formed on the lower main body 1, the upper surface of which forms an inclined surface 29 to the left. And the lever part 3 'of the LED frame 3 is rotated on the inclined surface 29 of the pivot 28 in a state where the upper body 2 is closed so as to rotate about the hinge 8 installed on the upper body 2. A bolt hole 4a in the upper portion of the right side of the LED frame 3 and the upper portion of the LED head array 4 so that the abutment is made and the LED head array 4 is installed on the upper right side of the LED frame 3. Between the formed compression spring (5a) is installed by fixing the bolt 13 in the bolt hole (4a) through the hole (3a) and the LED head array 4 side of the LED frame (3) is rotated upwards An elastic means 5 is installed between the LED frame 3 and the upper body 2 so as to have a restoring force, and both lower end portions 4b of the LED head array 4 are provided with a photosensitive drum 11. Contact with the LED positioning portion 12 'on both sides of the housing 12 so that the gap G between the photosensitive drum 11 and the LED head array 4 in the process unit 6 is accurately maintained. An image forming apparatus of an LED printer. The spring according to claim 5, wherein the elastic means (5) is fitted with a torsion spring to the hinge (8) of the LED frame (3) so that the LED head array (4) side of the LED frame (3) is rotated upward and has a restoring force. One end is fixed to the LED frame (3), the other end is the image forming apparatus of the LED printer, characterized in that the fixed to the upper body (2). The method of claim 5, wherein the elastic means 5 is tensioned between the upper side of the upper and upper body 2 of the LED frame 3 so that the LED head array 4 side of the LED frame 3 is rotated upward and has a restoring force. Image forming apparatus of the LED printer, characterized in that by connecting the spring.