JPS63188127A - Image forming device - Google Patents

Abstract

PURPOSE:To connect the electrodes of a light source with the power supply terminal of a light source lighting circuit without requiring a special connecting means by freely connecting and disconnecting both of them. CONSTITUTION:Output terminals o1, o2, o3, and o4 of a light source lighting circuit 55 are protruded in an enclosure 51 correspondingly to the electrodes a1, a2, b1, and b2 of an exposure lamp 22 at the 22 at the time of closing an upper unit 52. Consequently, when the upper unit 52 is opened or closed, electrodes a1, a2, b1, and b2 of the exposure lamp 22 are connected to or disconnected from output terminals o1-o4 of a transformer 58, that is, electrodes a1, a2, b1, and b2 of the exposure lamp 22 are abutted with the output terminals o1-o4 of the light source lighting circuit 55 when the upper unit 52 is closed, and electrodes a1, a2, b1, and b2 of the exposure lamp 22 are separated form output terminals o1-o4 of the light source lighting circuit 55 when the upper unit 52 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

(Prior Art) As is well known, in an electronic copying machine, a document image is read by lighting an exposure lamp (light source) and exposing and scanning the document surface.

In such electronic copying machines, a straight-tube fluorescent lamp is used as an exposure lamp, and more recently, an apparatus has been developed in which the fluorescent fi (exposure lamp) also serves as a static elimination lamp.

Incidentally, in the electronic copying machine as described above, when connecting the exposure lamp and the lighting circuit, a connecting means such as a wire harness is used. Therefore, when connecting the exposure lamp and the lighting circuit, special connection means such as harnesses and connectors are required. For this reason, it has the drawbacks of being expensive and difficult to assemble.

(Problems to be Solved by the Invention) This invention solves the following problems when connecting an exposure lamp and a lighting circuit.
This eliminates the drawbacks of requiring special connection means such as wire harnesses, which are expensive and difficult to assemble, and allows the connection between the light source electrodes and the power supply terminal of the light source lighting circuit to be made using an equally special method. It is an object of the present invention to provide an image forming apparatus that can be connected without requiring a connecting means, is inexpensive, and can improve work efficiency.

[Structure of the Invention] (Means for Solving the Problems) The image forming apparatus of the present invention includes a light source, an opening/closing mechanism for opening and closing a storage section including the light source with respect to the inside of the main body, and the main body. a power supply terminal of a light source lighting circuit, which is provided on one side and is connected to the electrode of the light source in accordance with the opening operation of the storage section by the opening/closing mechanism, and is brought into contact with the electrode of the light source when the storage section is closed; It consists of:

(Function) This invention provides a power supply terminal for a light source lighting circuit on one side of the main body corresponding to the electrode of the light source provided in the storage section,
The electrode of the light source and the power supply terminal of the light source lighting circuit can be freely brought into contact with and separated from each other according to the opening/closing operation of the storage section by the opening/closing mechanism.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

6 and 7 schematically show an image forming apparatus of the present invention, for example, an electronic copying machine. The mounted paper feed tray 3 is a paper discharge tray mounted on the left side of the copying machine main body 1. Further, on the top surface of the copying machine main body 1, a document table 4 is provided which can freely reciprocate in the left-right direction (in the direction of the oral arrow a). The document table 4 has a document placement plate (glass plate) 12 on which a document is placed, and a document cover 13 that covers the top surface of the document placement plate (glass plate) 12 .

Furthermore, on the front edge of the top surface of the copying machine body 1, there is a display section 5 that notifies the operating status of each part and the occurrence of an abnormality, number setting keys 61 and 62 for setting the number of copies per copy, and density setting keys 61 and 62 for setting the copy density. An operation panel 10 is provided with input keys including setting keys 71, 72, a print (copy) key 8, a clear/stop key 9, and the like.

On the other hand, the paper feed tray 2 serves as a manual paper feed tray 15 for feeding paper, and one or more sheets of paper can be set on the manual paper feed tray 15.

Next, the internal mechanism (copying mechanism) of the electronic copying machine will be explained with reference to FIG. In the figure, reference numeral 20 denotes a photosensitive drum disposed approximately in the center of the copying machine main body 1, and this photosensitive drum 20 is rotated in the direction of the arrow in synchronization with the document table 4 by a drive mechanism (not shown). . First, the surface of the document is charged by the charger 21, and the image of the document uniformly irradiated by the exposure lamp 22 is imaged at the exposure part ph by the focusing light transmitter (trade name, SELFOC lens array) 23. An electrostatic latent image is formed on the surface of the photosensitive drum 20. This electrostatic latent image is made visible by applying toner by the developing device 24.

In this case, the exposure lamp 22 is as shown in FIG.
The first straight part 22a of this U-shaped fluorescent light is connected to the frame 41, and the second straight part 22b is connected to the frames 42a, 4.
2b and a glue deflector 43 serving as a reflecting plate. In addition, the frames 41 and 4
2a.

42b is formed with an opening, and through this opening, light from an aperture (not shown) formed on the inner surface of the exposure lamp 22 is directed toward the document placement plate 12, that is, U-shaped fluorescent light is emitted. The combined light of the light from the first linear portion 22a and the light from the second linear portion 22b of the lamp is uniformly irradiated. Furthermore, a convergent light transmitting body 23 is disposed between the first linear portion 22a and the second linear portion 22b of the U-shaped fluorescent lamp,
Light corresponding to the original image irradiated by the exposure lamp 22 is guided to the photoreceptor drum 20 through the convergent light transmitter 23 .

On the other hand, as shown in FIG. 7, the sheets of paper (image-forming medium) set on the manual paper feed table 15 are taken out one by one by a feed roller 26 and a separation roller 27, and passed through a paper guide path 28 to be registered. It is guided to a pair of rollers 29, and sent to a transfer section by this pair of registration rollers 29.

The paper sent to the transfer section comes into close contact with the surface of the photoreceptor drum 20 at the transfer charger 30, so that the toner image on the photoreceptor drum 20 is transferred by the action of the charger 30. This transferred paper is electrostatically peeled off from the photoreceptor drum 20 by the action of the static elimination brush 31 for peeling.
The sheet is conveyed by the feed row 532 along the conveyance guide 33 and sent to a pair of fixing rollers 34 as a fixing device provided at the end thereof. The transferred image is fixed by passing through the pair of fixing rollers 34, and the fixed paper is discharged onto a paper discharge tray 3 outside the main body 1.

Further, residual toner on the surface of the photoreceptor drum 20 after the transfer is removed by a cleaner 35, and the photoreceptor drum 20 is further removed by the exposure lamp 22.
The afterimage is erased by the bypass slit light 36, which is a branched light beam, thereby returning to the initial state. That is, as shown in FIG. 8, a slit 44 is formed in the frame 42a, and a snow removal filter 45 is provided above the slit 44. Therefore, the light from the second straight portion 22b that is reflected by the reflector 43 via this static elimination filter 45,
In other words, the bypass slit light 36 is irradiated onto the photosensitive drum 20.

In addition, in FIG. 7, 37 is a cooling fan for preventing a temperature rise in the main body 1, 38 is an ozone filter that neutralizes ozone odor generated from the charging device 21, etc., and 39 is
is a paper detection switch that detects paper feeding errors and paper jams, 40
is a paper ejection switch that detects paper jams.

1 and 2 show a clamshell structure as an opening/closing mechanism. That is, an upper unit (storage section) 52 is pivotally supported at one end of a housing 51 in the copying machine main body 1 via a support shaft 53, and the other end of the upper unit 52 is rotated at a desired angle, for example. It is configured so that it can be opened at 25°. The upper unit 52 is equipped with devices such as a charging charger 21, a focusing light transmitter 23, an exposure lamp 22, and a cleaner 35 around the photosensitive drum 20 by appropriate means, and is configured as a process kit. ing. This upper unit 52 is
After the document placement plate 12 is moved, it is configured to be opened and closed as shown by the arrows in the figure via a case opening/closing device (not shown).

This makes it possible to easily remove jammed paper or replace parts of each device.

On the other hand, a light source lighting circuit 55 for lighting the exposure lamp 22 by 11 m is provided on one side of the housing 51.

As shown in FIG. 3, the light source lighting circuit 55 has a configuration in which a connector 57, an inverter transformer 58, and the like are arranged on a printed circuit board (PC board) 56. This inverter transformer 58 is provided with output terminals 01.02, O3, 04 made of leaf springs, and these output terminals 01.02.03.04 are supported by the bobbin 59 of the transformer 58. It has become.

The light source lighting circuit 55 has each output terminal 01 . o2.03.

04 is arranged at a position facing each electrode 111, a2, bl, b2 of the exposure lamp 22 when the upper unit 52 is closed. Therefore, when the process kit 52 is closed, as shown in FIG.
, b2 and each output terminal 01.02. of the light source lighting circuit 55.
0g and 04 are in contact with each other.

That is, as shown in FIG. 4, the exposure lamps 22 are positioned and held by being fitted with the electrode fixing members 61, 61 on the outer wall surface of the upper unit 52, respectively. It looks like this. Further, the upper unit 52
Each electrode al of the exposure lamp 22 when closed,
a2. t) The light source lighting circuit 55 is connected to the output terminals 01.02, 0! on the side of the reel 51 corresponding to x and b2. , o4
is provided so as to protrude into the housing 51. Therefore, depending on the opening/closing operation of the upper unit 52, each electrode a1, a2, bl, b2 of the exposure lamp 22 and each output/terminal 01, 02, 03, 04 of the transformer 58 are connected to each other, or In the disconnected state, that is, when the upper unit 52 is closed, each electrode a1, a2, bl, b2 of the exposure lamp 22 is connected to the light source lighting circuit 55.
Each output terminal 01. o2.03.

04, and when the upper unit 52 is open, each electrode al, a2, bl of the exposure lamp 22.

b2 is each output terminal 01, 02 of the light source lighting circuit 55.

It is set to be separated from 03.04.

FIG. 5 shows the configuration of the light source lighting circuit 55. That is, the first input terminal 71 of the connector 57 is connected to the intermediate tap of the first coil 72 on the primary side of the transformer 58 via the coil L, and to the base of the transistor Tri via the resistor iR1. It is also connected to the base of the transistor Tr2 via a resistor R2 and to the base of the transistor Tr1 via the second coil 73 on the primary side of the transformer 58. The collector of this transistor Tr1 is connected to one end of the first coil 72 on the primary side of the transformer 58, and the emitter is connected to the second input terminal 74 of the connector 57, the collector of the transistor Tr3, and the transistor T
It is connected to the emitter of r4 and the emitter of transistor Tr2, respectively.

The collector of this transistor Tr2 is connected to the transformer 5.
8 is connected to the other end of the first coil 72 on the primary side, and both ends of the first coil 72 are connected via a capacitor C.

In addition, the input terminal 71 is connected to a resistor R3, which is connected in parallel.
It is connected to the emitter of the transistor Tr3 via R4, and to the base of the transistor Tr4 via a Zener diode ZD whose polarity is reversed. and,
The base of the transistor Tr3 is connected to the third input terminal 75 via a resistor R5.
The base and emitter of are connected through a resistor R6.

Roughly speaking, of the third coil 76 and fourth coil 77 provided on the primary side of the transformer 58, the third coil 7
One end of the fourth coil 77 is connected to the output terminal 01 of the light source lighting circuit 55, and the other end is connected to the output terminal 02, and one end of the fourth coil 77 is connected to the output terminal 03, and the other end is connected to the output terminal 04. There is.

On the other hand, one end of the secondary coil 78 of the transformer 58 is
It is connected to the output terminal 01 and the bridge rectifier circuit 79, and the other end is connected to the output terminal 04 and the bridge rectifier circuit 79. The bridge rectifier circuit 79 has its rectifier output terminals connected to the collector and emitter of the transistor Tr4, respectively, and a resistor R7 between the base and emitter of the transistor Tr4.
connected via. Thereby, the supply of power to the exposure lamp 22 is controlled.

According to the above embodiment, the output terminal of the light source lighting circuit is provided on one side of the main body corresponding to the electrode of the exposure lamp provided in the upper unit, and the electrode of the exposure lamp and the output terminal of the light source lighting circuit are connected to the upper unit. It is designed to approach and separate in accordance with the opening and closing operations of the terminal.

In other words, when the upper unit is closed, the electrode of the exposure lamp comes into contact with the output terminal of the light source lighting circuit, so that
The structure is such that the electrode and the terminal are directly connected.

This makes it possible to connect the electrode of the exposure lamp and the output terminal of the light source lighting circuit without requiring any special connection means such as a wire harness or connector. Therefore, manufacturing costs can be reduced, and I!
It is possible to easily connect the poles and the terminals, or to connect and separate them. Therefore, it is inexpensive and can improve the efficiency of work such as assembly and parts replacement.

Furthermore, by constructing the exposure lamp as a light source with a U-shaped fluorescent lamp, the electrodes provided at both ends of the fluorescent lamp are concentrated on one side of the main body of the copying machine. This makes it possible to avoid noise generation by avoiding complicated wiring, and to reduce the proportion occupied by the power supply system to half (on one side). Therefore, it is possible to reduce the depth (front to rear side) of the copying machine main body, and the main body can be made smaller.

Although the above embodiment has been described using a copying machine with a movable document table as an example, the present invention is not limited thereto, and can also be applied to, for example, a copying machine with a fixed document table.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As detailed above, according to the present invention, the electrode of the light source and the power supply terminal of the light source lighting circuit can be connected without the need for any special connection means, and the cost is low. Therefore, it is possible to provide an image forming apparatus that is inexpensive in terms of cost and can improve work efficiency.

[Brief explanation of the drawing]

1 and 2 schematically show the structure of an electronic copying machine which is an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a light source lighting circuit. 4 is a side view showing the relationship between the electrodes of the exposure lamp and the output terminals of the light source lighting circuit, FIG. 5 is a circuit diagram showing the structure of the light source lighting circuit, and FIGS. 7 each shows the configuration of an electronic copying machine to which the present invention is applied.
7 is a side sectional view, and FIG. 8 is a side view showing the optical system of the electronic copying machine. DESCRIPTION OF SYMBOLS 1... Copying machine main body, 4... Document stand, 10... Operation panel, 12... Document placement plate, 20... Photosensitive drum, 21... Charger for charging, 22...・・Exposure lamp,
23... Focusing optical transmission body, 51... Housing, 52...
- Upper unit, 53... Support shaft, 55... Light source lighting circuit, 58... Inverter transformer, al, a2.
bl, b2-...electrode, Of, 02, (1, o4
...Output terminal.

Claims (4)

[Claims] (1) a light source; an opening/closing mechanism that opens and closes the storage section containing the light source from inside the main body; and an electrode of the light source provided on one side of the main body that responds to the opening operation of the storage section by the opening/closing mechanism. and a power supply terminal of a light source lighting circuit which is spaced apart from and comes into contact with an electrode of a light source when the storage section is closed. (2) The image forming apparatus according to claim 1, wherein the light source lighting circuit includes a transformer, and the power supply terminal is supported by a bobbin of the transformer. (3) The image forming apparatus according to claim 1 or 2, wherein the power supply terminal is constituted by a leaf spring. (4) The image forming apparatus according to claim 1, wherein the light source is a U-shaped fluorescent lamp.