JP2929670B2 - Fixing device for electrophotographic printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a fixing device of an electrophotographic printing device, and an object of the present invention is to provide a fixing device in which a flash lamp can be easily replaced. The unit comprises a detachable lamp unit and a lamp unit support for fixing the lamp unit. The lamp unit support also serves as a power supply terminal for the flash lamp, and a plurality of lamp units are provided according to the electrodes of the flash lamp. The lamp unit is mainly composed of a frame for mounting a plurality of flash lamps to be mounted, and the frame is provided with a connecting portion to which a lead wire is connected for each electrode of the flash lamp. Each connecting part of the lamp unit is connected to each of the lamp unit support bases with a head screw for conduction provided in the unit. Wherein a detachably secured to each of the flash lamp configured to connect the respective lamp unit support base.

[Industrial applications]

The present invention relates to a fixing device of an electrophotographic printing apparatus, and more particularly, to a fixing device that facilitates replacement of a flash lamp of the fixing device.

2. Description of the Related Art As a fixing device of an electrophotographic printing apparatus, there is a flash fixing device that fixes by light energy at the time of flash of a flash lamp. The flash fixing is such that the light energy at the time of flashing is absorbed by the toner on the recording paper and the toner is melt-fixed. Therefore, there are advantages in that efficient fixing can be performed and warm-up heating is not required.

The flash lamp of such a fixing device is consumed by repeated flashing, and stable fixing cannot be performed. For this purpose, the flash lamp must be replaced at a certain number of flashes or periodically.

[Conventional technology]

Meanwhile, the conventional flash lamp is fixed one by one to a predetermined position in the fixing device with a fixing bracket, and is connected to two lead wires of a main electrode taken out from the flash lamp and a trigger wire provided on the outer surface of the flash lamp. It has a structure in which a total of three lead wires, one lead wire, are fixed to predetermined terminals one by one with screws. Therefore, in order to replace the flash lamp, the screws fixing these lead wires to the connection terminals are removed, the lead wires are removed, and the fixing bracket is removed to remove the flash lamp. Then attach the new flash lamp to the frame with the fixing bracket, and attach the lead wires with screws. When there are several flash lamps, the same operation is repeated several times.

[Problems to be solved by the invention]

However, when removing or attaching the flash lamp by replacement work on the device, the work space is narrow,
When a large-sized printing apparatus is used, the mounting position of the flash lamp becomes relatively high, and the posture of the worker becomes unstable. For this reason, the flash lamp mounting condition becomes unstable, the wire is broken due to excessive force when wiring the lead wires, the mounting screws are dropped inside the layout,
Work mistakes such as breakage of flash lamps are likely to occur. In addition, there has been a problem that it takes a relatively long time to recover from such a work error, a long time is required for the replacement work, and the burden on the operator increases.

The present invention has been made in view of the above-described problems, and has as its object to provide a fixing device capable of easily replacing a flash lamp.

[Means for solving the problem]

SUMMARY OF THE INVENTION In order to solve the above-described problem, the present invention provides a fixing unit of an electrophotographic printing apparatus, wherein the fixing unit includes a detachable lamp unit and a lamp unit support for fixing the lamp unit, The stand is
Also serves as a power supply terminal for the flash lamp, a plurality of flash lamps are installed in accordance with the electrodes of the flash lamp, the lamp unit is mainly a frame for mounting a plurality of flash lamps to be mounted, and the frame has the A connecting portion to which a lead wire is connected is provided for each electrode of the flash lamp, and each connecting portion of the lamp unit is detachably attached to each of the lamp unit support bases with a threaded head screw provided at each of the connecting portions. The flash lamps are fixedly connected to the lamp unit supports.

(Operation)

In short, in the present invention, since the fixing device is unitized by using a frame having a function of supporting the flash lamp and relaying the electrode lead, when replacing the lamp, the fixing unit is removed from the printing apparatus together with the frame. Can be performed, and workability is remarkably improved.

〔Example〕

FIG. 3 is a configuration diagram showing an example of an electrophotographic printing apparatus to which the present invention is applied, 11 is a photosensitive drum, 12 is a charger,
Reference numeral 13 denotes an exposure device, 14 denotes a developing device, 15 denotes a transfer device, 16 denotes a paper feeding unit, 17 denotes a fixing device, 18 denotes a paper stacker, and 19 denotes a post-processing unit.

An exposure device 13 forms an electrostatic latent image on the surface of the photosensitive drum 11 uniformly charged by the charger 12. The electrostatic latent image formed on the photosensitive drum 11 is supplied with toner by the developing device 14 and is visualized.

On the other hand, the continuous paper is transported at the same speed as the peripheral speed of the photosensitive drum 11 by the paper transport tractor of the paper transport unit 16.
At the transfer position facing the photosensitive drum, the continuous paper is charged by the transfer device 15 with a polarity opposite to that of the toner on the photosensitive drum 11, and the toner image on the photosensitive drum 11 is transferred to the continuous paper. The toner image transferred to the continuous paper is conveyed together with the continuous paper, and is fused and fixed by the fixing device 17. The printed continuous paper is folded by the paper stacker 18 and accumulated.

After the transfer, the photosensitive drum 11 is subjected to charge removal and cleaning by the post-processing unit 19, and the same operation is repeated again.

Although the above configuration is not particularly different from the conventional general electrophotographic printing apparatus, the present invention is characterized by the unitization of the fixing device 17 and will be described below with reference to FIGS. 1 and 2. This will be described in detail.

FIG. 1 is a top view showing one embodiment of a fixing device according to the present invention, and FIG. 2 is a side sectional view. In the figure, reference numeral 6 denotes a flash lamp to be replaced, and reference numeral 1 denotes a frame for integrally and continuously supporting a portion necessary for removing the flash lamp 6 from the fixing device. The main electrode connection terminal 7 fixes the flash lamp unit integrally fixed and supported to the frame 1 and connects the main electrode, and is fixed to the frame 1 via the insulating support member 2. A flash lamp support 4 is mounted between the insulating support members 2. The trigger connection terminal 9 is fixed to the frame 1 via the insulating member 3. Lead wires of a main electrode taken out from both ends of the flash lamp are fixed and connected to the main electrode connection terminal 7 with screws, and leads connected to a trigger electrode arranged on the outer wall of the flash lamp are connected to the trigger connection terminal 9. The wires are fixed with screws and connected.

As is clear from the side sectional view of FIG. 2 showing the state where the flash lamp unit is attached to the fixing device, the main electrode connection terminal 7 is provided so as to be able to conduct with the coupling portion 8, and 81 is the lead wire 82 from the drive circuit
Are connected, the main frame of the flash lamp 6 can be connected to the drive circuit by fixing the frame of the unit with the connecting screw 83 of the connecting member.

A lead wire taken out from the trigger electrode is fixedly connected to the trigger connection terminal 9, and a plug 91 extending from the trigger connection terminal 9 is inserted into a jack 92 on the fixing device side to be electrically connected. Since the lead wire 93 extending from the jack 92 is connected to the trigger circuit, the trigger wire is connected to the circuit.

The flash lamp supporting bracket 4 is provided with a V-shaped recess at the flash lamp fixing position. The recess is used to stabilize the flash lamp so that it does not move in the lateral direction. Pressed and fixed.

When replacing the flash lamp, attach the integrated flash lamp unit to the fixing
Remove the connecting screw 83 of the connecting portion 8 fixed to 81 and remove it from the fixing device. Since this coupling screw uses a screw with a neck, it does not fall off the flash lamp unit.

When the flash lamp unit is removed, it is easy to work, for example, on a desk, as in the conventional case, the main electrode connection terminal 7
Then, the lead wires of the main electrode and the trigger electrode fixed to the trigger connection terminal 9 with screws are removed, and the flash lamp fixing bracket 5 is removed to remove the flash lamp 6 from the frame 1.

At this time, since the work is performed in a place where the work is easy, these works can be performed easily and quickly. Also, when removing the fixing metal 5, there is no need to worry about dropping the flash lamp 6 or the fixing metal 5, so that the work becomes easy. In addition, unlike working on a printing device, even if a screw is dropped, the work can be performed in a relaxed manner without fear of falling into the device.

Then, the old flash lamp 6 used so far is replaced with a new one and fixed to the frame 1 with the fixing bracket 5, and each lead wire of the main electrode and the trigger electrode is attached with a screw.

The flash lamp unit to which the new flash lamp 6 is attached is attached to the fixing device and fixed with the connecting screw 83, thereby completing the replacement operation. At this time, by fixing with the connecting screw 83, the connecting portion 8 and the support base 81 on the fixing device side are connected to be conductive.

In the present invention, the connection resistance is reduced by using a screw connection at the junction of the circuit of the main electrode through which a large current flows, thereby preventing a large voltage drop due to the large current at the connection portion.
Further, since the trigger electrode through which a large current does not flow is connected by a plug and a jack, screwing work when fixing the flash lamp unit to the fixing device can be reduced.

〔The invention's effect〕

According to the present invention, the flash lamp mounting portion of the fixing device has such a unit configuration, so that it is possible to replace the flash lamp requiring special attention outside the apparatus. When attaching and detaching to and from the fixing device of the printing device, since the screw with a neck is used, the screw does not fall off inside the device and fall,
Failure can be prevented.

Further, since the lamp unit and the drive circuit of the flash lamp are connected only by attaching the lamp unit to the apparatus again, there is an effect that a highly reliable operation without an operation error can be performed in a short time.

[Brief description of the drawings]

 FIG. 1 is a top view showing a fixing device according to the present invention, FIG. 2 is a side sectional view showing a fixing device according to the present invention, and FIG. 3 is a diagram showing a configuration of an electrophotographic printing apparatus. In the figure, 1 is a frame, 6 is a flash lamp, 7 is a connection terminal, and 8 is a coupling part.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 15/20 H05B 7/11

Claims (1)

(57) [Claims] 1. A fixing unit of an electrophotographic printing apparatus, wherein the fixing unit comprises a detachable lamp unit and a lamp unit support for fixing the lamp unit, and the lamp unit support is provided for a flash lamp. The lamp unit is also provided with a plurality of flash lamps to be mounted. The lamp unit mainly includes a frame for mounting a plurality of flash lamps to be mounted, and the frame includes electrodes for the flash lamps. Each connecting portion to which a lead wire is connected is provided, and each connecting portion of the lamp unit is detachably fixed to each of the lamp unit support bases by a threaded neck screw for conduction provided at each of the connecting portions. An electrophotographic printing apparatus, wherein a flash lamp is connected to each of the lamp unit supports. Fixing device.