JPH023557Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a pair of upper and lower fixing rolls, an application roll for applying an anti-offset agent to at least one of the fixing rolls, and a system for supplying the anti-offset agent to the application roll. The present invention relates to an improved technology for a fixing device for a copying machine, which comprises a storage tank unit having a mechanism and a cleaning mechanism for the surface of the coating roll, and the storage tank unit is configured to be freely inserted into and removed from a storage space below both of the rolls. .

In the storage tank unit of the fixing device described above, the supply mechanism for the anti-offset agent is to immerse one end of the cloth in the storage tank containing the anti-offset agent such as silicone oil, and apply a coating roll to the other end of the cloth. The cleaning mechanism brings a cleaning cloth into elastic contact with the surface of the application roll to supply the anti-offset agent to the application roll through capillary action caused by the cloth, and the cleaning mechanism brings the cleaning cloth into elastic contact with the surface of the application roll to supply the anti-offset agent to the application roll. Dust such as paper powder adhering to the roll surface as it rotates is removed.

By the way, the cloth or cleaning cloth used to apply the offset prevention agent needs to be replaced when its function deteriorates.
The storage tank unit is screwed into its storage space so that it can be inserted and removed, but various maintenance tasks, including replacing the cloth, are complicated and time-consuming, and an immediate improvement is desired. There is.

The present invention was devised in response to such demands, and has a locking mechanism that utilizes the elastic force of the anti-offset agent supply mechanism and cleaning mechanism for the application roll, making it possible to easily insert and remove the storage tank unit. The purpose is to

Hereinafter, this invention will be explained using a preferred embodiment structure shown in the drawings. FIG. 1 shows an example of a copying machine to which this invention is applied, in which the front panel 1 is opened from the main body 2, and the main body front wall 3 A detachment port 5 for the fixing section unit 4, which will be described later, is provided at a position corresponding to the fixing section, and the fixing section unit 4 is configured to be attached to and detached from the main body 1 through this detachment port 5.

As shown in FIG. 2, the fixing section unit 4 has a handle 31 attached to the front surface of the unit 4, and is equipped with a crank-shaped handle 33 having a fulcrum 32 on the top surface. 4, the handle 33, which is in the folded state shown in the figure, is erected, and by holding both this and the handle 31, it can be easily carried.

FIG. 3 is a sectional view showing the internal structure of the fixing section unit 4. A pair of upper and lower fixing rolls 8 and 9 are forcibly driven between a copy paper inlet section 6 and a copy paper output section 7 for this unit 4. A heating lamp 10 is installed inside the fixing rolls 8 and 9.
11 are integrally installed, and the two are brought into contact with each other under appropriate pressure, and the copy paper passing through the fixing rolls 8 and 9 is pressurized and heated to fix the toner on the copy paper. Further, these fixing rolls 8 and 9 have a normal structure in which roll bodies 8a and 9a made of aluminum or the like are coated with silicone rubber 8b and 9b, and a copy paper peeling claw 12 attached to the copy paper delivery section 7 side is used. ,12
are always applied to the outer peripheral surfaces of the fixing rolls 8 and 9 to prevent passing copy paper from being wrapped around these rolls. At the lower side of the lower fixing roll 9, a coating roll (made of metal) 13 is mounted on a shaft so that it can move a certain amount in the direction toward and away from the roll 9, and the lower fixing roll 9 and the coating roll 13 A storage tank unit 14 is set in the lower part of the tank. This storage tank unit 14 is connected to the coating roll 13.
It has a function of supplying the anti-offset agent to the lower fixing roll 9 and a mechanism for cleaning dust such as paper powder adhering to the applicator roll 13, and a predetermined amount of the anti-offset agent 15 is stored. A substantially L-shaped leaf spring 18 is fixed onto a support member 17 guided upward from the oil storage tank 16, and an upright piece 18a of the leaf spring 18 is covered with felt or the like. One end of this impregnated cloth 19 is immersed in the oil storage tank 16 as shown in the figure, and the other end is layered on the horizontal piece 18b of the leaf spring 18. A cleaning cloth 21 made of heat-resistant felt has an elastic body 20 like a sponge wrapped inside it.
is placed or secured by appropriate means. In the set state of the storage tank unit 14, the receiving member 17 is inserted below the application roll 13, and the cleaning cloth 21 is applied from below, and at the same time is pressed upward by the elastic force of the elastic body 20, while the plate The upright piece 18a of the spring 18 presses and biases the applicator roll 13 in the direction of the lower fixing roll 9 with its spring force, thus maintaining a suitable elastic contact between the lower fixing roll 9 and the applicator roll 13,
Further, the reaction force of the leaf spring 18 and the elastic body 20 is used to press the oil reservoir 16 downward, and the reservoir unit 14 is locked in the set state. Reference numeral 22 denotes an elastic member such as a sponge attached to the leaf spring 18, which functions to buffer the impact against the impregnated cloth 19 and the application roll 13. Storage tank unit 14 thus configured
For attachment to the fixing unit 4, a trapezoidal protruding pedestal 23 is formed at the center of the lower surface of the oil storage tank 16, as shown in FIGS. 3 and 4. Horizontal flange wings 24, 25 extend from the front and rear ends in the insertion/extraction direction, and a pair of engagement tongues 26, 26 are provided at both ends of the horizontal flange wing 25 on the tip side in the unit insertion direction. Correspondingly, in the storage tank unit storage space 27 of the fixing section unit 4, a storage tank unit insertion/extraction port 28 is opened in the front wall 4a corresponding to the downstream side in the paper ejection direction.
and an engagement hole 29 is opened in the rear wall 4b,
A retaining vertical piece 30 is cut and raised on the bottom wall 4c.

In this configuration, when setting the storage tank unit 14 in the fixing section unit 4, the storage tank unit 14 is inserted into the above-mentioned insertion/extraction port 28 diagonally from above as shown in FIG. 5, and then inserted into the engagement hole 29. Engagement tongue piece 2
6 is thrust into engagement as shown in FIG. 6, the base portion 23 of the oil storage tank 16 is made to climb over the retaining vertical piece portion 30. If this is the case, in this insertion operation process, as shown in FIG.
The elastic body 20 sneaks into the lower part of the application roll 13 and pushes the roll 13 upward, and the reaction force of the push-up is generated as a downward pushing force on the storage tank unit 14. Next, as shown in FIG. 6, the leaf spring 18 presses the applicator roll 13 against the lower fixing roll 9 from the side, and the reaction force is used to push the upright portion 18a of the leaf spring 18.
is tilted, and similarly a downward pushing force is applied to the storage tank unit 14. Therefore, at the point where the stand part 23 climbs over the retaining piece part 30, the unit 1
4 automatically and elastically sinks downward, and the third
As shown in the figure, it is engaged with the retaining vertical piece 30 to be fixed and locked in place. Further, the engagement tongue piece 26 presses against and engages with the upper end of the engagement hole 29, and the horizontal flange wing 25 presses against the inner surface of the rear wall 4b, causing the locked storage tank unit 14 to float up. Prevents side-to-side movement. Therefore,
The storage tank unit 14 is fixedly placed in the storage tank unit storage space 27 in an immovable position. Then, insert the fixing section unit 4 into the main body 2 through the attachment/detachment opening 5,
When a predetermined copying operation is started, the impregnated cloth 19 sucks up the anti-offset agent 15 by capillary action and supplies it to the circumferential surface of the applicator roll 13, and the applicator roll 13 applies an appropriate thickness of the anti-offset agent 15 to the lower fixing roll 9. This improves the peelability between the copy paper and the lower fixing roll 9. Additionally, paper dust and the like adhering to the application roll 13 are wiped off with a cleaning cloth 21. When replenishing the offset preventive agent 15 in the oil storage tank 16 when it has decreased, or when replacing the cleaning cloth 21 when it becomes soiled, remove the fixing section unit 4 from the main body 2, and then fix it by the reverse operation to that described above. From unit 4 to storage tank unit 1
4 will be extracted and carried out.

In addition, as shown in FIG. 7, a fulcrum pin 3 is attached to the main body 2 side.
The fixing section unit 4 is equipped with a lock link 35 that can freely rotate around the fixing unit 4, and a corresponding concave notch 36 is provided in the fixing section unit 4. The extraction is temporarily stopped when the lock link 35 is fitted into the recessed part 36, and then the lock link 35 is manually inserted into the recessed part 3.
It is designed so that complete extraction can only be achieved by removing it from 6.

In addition, the engaging tongue piece 26 on the side of the storage tank unit 14
Of course, the engagement structure between the fixing unit 4 and the engagement hole 29 on the side of the fixing section unit 4 may be replaced with a pin and a pin hole.

In the above embodiment, the fixing section is configured as a unit that can be detached from the main body 2, and the storage tank unit 14 is further attached to and detached from the fixing section unit 4, but this fixing section unit is abolished and the storage tank unit 14 may be directly attached to and detached from the main body 2 from the paper discharge section.

In the above-mentioned embodiment, a coating roll for applying an anti-offset agent to the lower fixing roll, a mechanism for supplying the anti-offset agent to the coating roll, and a cleaning mechanism for the surface of the coating roll are provided. Although the explanation has been made regarding a case in which a storage tank unit is provided, a storage tank unit may be provided for at least one of the fixing rolls.

As described above, this invention has an oil storage tank that is integrally equipped with an impregnated cloth, which is a means of supplying the anti-offset agent to the coating roll, and a cleaning cloth, which is a means of wiping dust such as paper dust from the coating roll. The storage tank unit is configured to be removable from the fixing section, and is fixed in the storage position using an elastic body that presses the impregnated cloth and the cleaning cloth against the application roll. That is, the leading end of the storage tank unit in the insertion direction is plunged into engagement with the side wall of the fixing part in a state where the unit is prevented from lifting up and moving from side to side, and the storage tank unit is engaged from the removal direction with the retaining part provided upright on the bottom wall of the fixing part. The storage tank unit is fixed in the storage position by the elastic reaction force acting in the downward direction of the first elastic body and the elastic reaction force acting in the oil storage tank protrusion direction of the second elastic body. The unit can be inserted and removed against or using elastic reaction force, and it can be easily done with one touch without the need for the complicated steps of conventional screw fastening, and it is easy to handle during use. Another advantage is that replenishment of the offset prevention agent and replacement of the cleaning cloth can be speeded up.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; FIG. 1 is a perspective view of the copying machine with the front panel opened, FIG. 2 is an enlarged external perspective view of the fixing unit, and FIG. 3 is a vertical sectional view of FIG. , FIG. 4 is an enlarged external perspective view of the storage tank unit, FIGS. 5 and 6 are explanatory diagrams of the insertion procedure of the storage tank unit, and FIGS. 7A and B are conceptual diagrams showing the additional configuration of the main parts. . 4... Fixing section (fixing section unit), 9... Fixing roll, 13... Application roll, 14... Storage tank unit, 15... Offset prevention agent, 16... Oil storage tank, 18, 20... Elasticity Body, 19... Impregnated cloth, 21... Cleaning cloth, 26... Reservoir unit insertion direction tip (engaging tongue piece), 27...
Reservoir unit storage space, 30... Retaining part (retaining vertical piece).

Claims (1)

[Scope of utility model registration request] A pair of upper and lower fixing rolls, an application roll for applying an anti-offset agent to at least one of the fixing rolls, a mechanism for supplying the anti-offset agent to the application roll, and a cleaning mechanism for the surface of the application roll. A fixing device for a copying machine comprising a storage tank unit, the storage tank unit configured to be freely inserted into and removed from a storage space below both the rolls, the fixing device comprising: an oil storage tank for storing the offset prevention agent; a cleaning cloth that infiltrates below the application roll; a first elastic body that presses the cleaning cloth into contact with the application roll; an impregnated cloth immersed in the oil storage tank; The storage tank unit is constituted by a second elastic body that is pressed into contact with the second elastic body, and the leading end of the storage tank unit in the insertion direction is plunged into engagement with the wall of the fixing unit in a state where lifting of the unit and sideways movement is prevented, and the bottom of the fixing unit is The storage tank unit is engaged with a retaining portion provided on the wall in the extraction direction, and the elastic reaction force acting in the downward direction of the first elastic body and the elasticity acting in the oil storage tank extraction direction of the second elastic body A fixing device for a copying machine, characterized in that the fixing device for a copying machine is configured to fix the storage tank unit in the storage space based on a reaction force.