JPS5967568A - Fixation device - Google Patents

Abstract

PURPOSE:To set and reset and convert the pressure of a pressure roll easily in safety by providing a fixation device which consists of a heat roll and a heating roll with the pressure lever and an auxiliary lever which share one supporting shaft, and energizing the pressure roll against the heat roll, and releasing the pressure roll from being energized. CONSTITUTION:The pressure lever 4 and the auxiliary lever 5 share a fulcrum 6 and when the auxiliary lever 5 rotates clockwise around the fulcrum, its side edge abuts on a stopper 8 on the pressure lever 4 to eliminate relative movement between both levers. A pressure spring 7 is extended between both levers 4 and 5. When the auxiliary lever 5 is rotated counterclockwise, the pressure lever 4 rotates following after the auxiliary lever 5 as if they are incorporated in one body, but it abuts on the outer circumference of the bearing 29 of the pressure roll 3 soon. When the auxiliary lever 5 is further rotated, the tensile force of the pressure spring 7 is exerted on a bearng 29 through the lever 8. At this time, a clamp lever 9 is operated to hold a clamping state stably because the auxiliary lever 5 is set.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a pressure mechanism in a heat roller fixing device for fixing toner or other toner onto a transfer paper.

Prior Art Usually, the pressure means for the fixing roller in the fixing device of this ridge is -4? A pressure lever pivotally supported on a frame is brought into contact with the outer periphery of the bearing of the pressure roller, and a spring is applied directly to the other end of the pressure lever. It was pressed against the heating roller so that a pressing force was generated on the contact surfaces of both rollers. However, when using this kind of pressure mechanism of our company, a) special tools are required to attach and detach the spring, and if you fail to engage the pressure lever, you have to pull out the spring basin and use your fingers. This poses a danger, especially when servicing the market.

口) Since the spring is difficult to attach and detach, it is difficult to release the pressure on the roller to remove the jammed paper or as a preparatory work to cross the rollers.

Purpose The present invention has been devised to solve the above-mentioned drawbacks, and its first purpose is to provide a pressure mechanism that can easily and safely convert the pressure force of the pressure roller in the fixing device. The goal is to provide the following.

A second object is to realize a fixing device in which the heat roller can be installed and removed very easily and easily.

The next objective is a fixing device where the heat roller and pressure roller can be easily replaced. This is what we are trying to provide.

The next object is to provide a fixing device in which it is extremely easy to remove entangled jambs.

Configuration In order to achieve the above objectives, the present invention meets the following requirements? It is constructed by combining organic Q's, and will be explained below based on the implementation sequence.

Embodiment The implementation will now be described with reference to the IJk drawings.

That l.

1 to 4 are partially cutaway side views showing the basic configuration of an embodiment 13'll of the present invention. In FIG. 1, ■ is a fixing device frame (hereinafter referred to as a side plate).
Each of the members described below is generally held in mutual position by the side plates. 2 is a heat roller supported by a bearing on the side plate 1;
The toner 4 is circumscribed by ;f:'n of the pressure roller 3 on its outer peripheral surface, and when the transfer paper carrying a developed image passes between the circumscribed surfaces, a developed image is formed by the heat roller and the pressure roller. Softening 1 acts to press and fix on the transfer paper surface. Reference numeral 4 denotes a pressure lever, which is rotatably connected to the side plate 1 by a lever support shaft 6, the negative end of which is in contact with the outside of the bearing 29 of the pressure roller 3, and the other end of which is provided with a pressure spring. Stretch and lock one end of 7. In addition, the pressure lever 4 is provided with a stopper 8 that engages with the side edge of the auxiliary lever 5. Similar to the pressure lever 4, the auxiliary lever 5i has one end rotatably pivoted to the lever support shaft 6, and the other end of the pressure spring 7 is locked and tensioned to the other side leg. and both levers 4 and 5
If there is no external restriction, the levers can be rotated relative to each other until the levers are pulled by the pressure spring 7 and are stopped by the stopper 8. The side edge of the other leg of the auxiliary lever 5 is of course provided with a concave portion and a sloped surface following the concave portion, and 11 clamp pins 11 are installed on the side edge of the clamp lever 9 which is pivoted to the side plate 1 by means of a pivot pin 10. When the lever 9 is abutted and the lever 9 is clamped, that is, when the clamp lever 9 is in the vertical direction as shown in FIG. 1, the clamp pin t t ka! Fit the auxiliary lever 5 into the recess and move the auxiliary lever 5 to the lever fulcrum 6.
The rotation is transmitted to the pressure lever 4 through seven pressure springs, so that the pressure lever 4 also swings counterclockwise about the fulcrum 6. However, in the middle of the movement, one end of the lever 4 comes into contact with the outer periphery of the bearing 29 that supports the three pressure rollers. heat roller 2
bias to the side.

Since the mounting hole 32 formed in the side plate 1 is lowered so that the bearing 29 can move freely in the direction of the heat roller, the bearing 29 moves toward the heat roller along with the entire pressure roller 3.

After the circumferential surface of the pressure roller 3 comes into contact with the outer periphery of the heat roller 2 with the necessary and sufficient pressure, the pressure lever 4 can swing around the lever support shaft 6 more than once. On the other hand, as for the auxiliary lever 5, the clamp bottle 11 is
Since the levers do not stop rotating counterclockwise until they are set in the recesses, both levers will eventually transmit torque by stretching the full set length of the acid n1 pressure spring 7 from the stopper 8. , the pressure spring 7 is
This tension appears as a circumscribed pressure between the heat roller 2 and the pressure roller 23.

To reset the pressing force 2 between the heat roller 2 and the pressure roller 3, as shown in FIG. When rotated, the clamp pin 11 is moved out of the recess of the auxiliary lever 5 and rotated clockwise around the lever fulcrum 6 of the auxiliary lever 5, so that the pressure spring 7 is compressed and the side edge of the auxiliary lever 5 is The pressure lever 4 comes into contact with a stopper 8 provided upright, and then the pressure lever 4 is rotated clockwise around the lever fulcrum 6 via the stopper 8r.
Since one end is released from the pressure of the bearing 29 of the pressure roller, the outer peripheral surface of the pressure roller 3 releases the pressing force between it and the outer periphery of the heat roller 2, and further reduces the gap. This will occur, so remove the jammed paper 4.
Make it extremely easy.

In the figure, 20 and 21 are attached to the side plate 1 and are the lower and upper plates of the entrance guide plate provided on the upstream side of the conveyance of the transfer M1 with respect to the fixing section, and 22 is the so-called so-called plate on the circumferential surface of the fixing roller 2. oil? Felt for application, 23Fi, pump up oil 257 in oil tank 24 and apply felt 2
A felt 26 is a blade for removing toner that adheres to and remains on the circumferential surface of the fixing roller 2, and is provided so as to come into contact with the circumferential surface of the heat roller 2 at the rear of the oil coated felt 22. 27 is a flow rate detector, which is a sensor for controlling the circumferential flow rate of the heat roller 2 to always be within a predetermined range; 28 Vi, a heater lamp; 29, a bearing for the pressure roller 3; It is supported in a mounting hole groove provided in the plate 1 and can freely slide in the direction of the heat roller along the hole groove when it is pushed toward the heat roller side by one end of the pressure lever 4. It is.

FIG. 2 shows another implementation [PIJk] in which the pressure spring 7 is given a compression spring 4; in this case, the expansion of the spring 7 causes the side edge of the auxiliary lever 5 to come into contact with the stopper 8 of the pressure lever 4; As the auxiliary lever 5 swings clockwise around the lever fulcrum 6 due to the centration of the clamp lever 9, the pressure lever 4 presses the 29 pressure roller bearings via the compression pressure spring. The other configurations and technical concepts are exactly the same as those using the above-mentioned tension spring.

To explain the function and effect of "Implementation 1", the pressure lever 4 and the auxiliary lever 5 share a fulcrum 6r, and when the auxiliary lever 5 rotates clockwise around the fulcrum, its side edge When the force a comes into contact with the stopper 8 on the pressure bar 4, there is no relative movement between the two levers. The pressure spring 7 is
In this state, tension is applied between both levers 4 and 5, and δn is applied. Therefore, when the 5 auxiliary levers are rotated counterclockwise, the pressure lever 4 is rotated by the auxiliary lever 5 as if the pressure lever 4 is integrated, but eventually the pressure roller 3
The outer periphery of the bearing 29 contacts the outer periphery of the bearing 29 . When the auxiliary lever 5 is further rotated, the tension of the pressure spring 7 acts as a pressure force on the bearing 29 via the lever 4.

At this time, for the cent of auxiliary lever 5, clamp lever 9
It is possible to stably hold the clamped state with the clamping awn. ff1l, the lever 9 is pivotally connected to the lever fulcrum pin 10, and the clamp pin 11 is erected, and the clamp lever
Since the pin 9 stops when the pin 11 engages with the recess of the auxiliary lever 5 at the position where it has rotated beyond the dead point with respect to the fulcrum pin 10, the lever 9 will not move unless an external force larger than a predetermined amount is applied. , it will never move out of its cent position.

In addition, as shown in FIG. 3, rotate the clamp lever from the 9γ cent position to beyond the dead point tray,
The pressure spring can escape from the recess of the auxiliary lever 5 and be applied to the pressure roller 3.

That is, it is possible to set and reset the pressure between the rollers in the fixing device only by rotating the clamp lever 9, and compared to a method in which the pressure spring is not directly engaged and is removed,
Not only does pressurization center and reset become easier,
Considering the number of services available in the market, this service is especially excellent in terms of safety.

2. Figures 3 and 4 are perspective views showing the side plate bag with both rollers removed and the process of replacing the heat rollers. This is a mounting hole for a thermal roller bearing 30 having an outer diameter slightly larger than the diameter of the roller 2, and the bearing 30 is removably fixed to the side plate 1 by known means. According to this implementation 1lvC, after applying pressure k IJ cent of the pressure roller 3, @receiver 30n side plate 1
By removing the blade, a mounting (through) hole 31 larger than the diameter of the heat roller 2 is formed in the side plate, so the heat roller 2 can also be removed in the side direction through this hole 31, making it easy to replace the roller. Make it.

At this time, it is necessary to remove the heater lamp 28 before starting the work.

Further, the diameter of the through hole 31 of the side plate 1 can be made large enough to allow the roller to pass through without being obstructed by the salinity detector 27, the felt 22, etc.

Note that the configuration of the pond is a fixing device as described in Example 1.

Part 3 Referring to Figure 3 and Figure 4, 32 is the side plate 1.
The hole 32 is a mounting hole for the pressure roller bearing 29 provided in the through hole 31, and the hole 32 communicates with the through hole 31 through a connecting groove 33 having an interval equal to the diameter of the hole 32. The pressure roller bearing 29 is configured to be able to slide in the direction of the heat roller in the connecting groove 33 by pressure from the pressure lever 4 based on public means. In addition, the parts whose description is omitted are the same as those described in the first and second embodiments.

As mentioned earlier, the pressure roller bearing 2 is removed from the bearing mounting hole 31 drilled in the purple side plate l of the heat roller 2.
9 can be slid upward through the entire connecting groove 33, and since the bearing reaches the large-diameter through hole 31 at its terminal end, the pressure roller 3 also slides from this hole to the side with its bearing 29. It can be removed in any direction.

Gradually, the conversion work for both rollers is done by pressure spring 7.
There is no need to attach or detach the device, and it can be done very easily.

Conventionally, the removal grooves of the pressure roller bearing 29 have been drilled in the opposite direction to the two rotations of the heat roller, that is, in the downward direction, but the workability is not good. In the case of the present invention,
It is difficult to combine the present invention with the prior art because it is impossible to remove the pressure roller bearing r below without letting the lever member of the pressure mechanism escape.

The 4° plate 13 is set in a fixed position by a fulcrum 12, a set lever 16 pivoted on the upper part of the upper plate 13, and a hook bin 17 erected on the side plate 1 opposite to the set lever 16. It will be reduced. In addition, on the auxiliary side plate 13, a pair of pull-out rollers 14 and 15i are pivotally supported on the downstream side of conveyance of the transfer paper, facing the fixing device with the same side plate set in a fixed position, and a pair of pull-out rollers 14 and 15i are supported to separate the paper from each other. The claw ts2 is attached, and 19 springs are applied to the claw ts2, which urges the tip of the claw to come into contact with the circumferential surface of the heat roller 2.

The auxiliary plate 13 has a set lever L6i hook pin 17.
By removing it from the heat roller, it can be swung counterclockwise around the fulcrum 120 as shown in FIG. I'm going to work on it.

From this state, when the auxiliary side plate 13 is pressed clockwise against the fuser body U, the inclined surface of the tip of the set lever 16 comes into contact with the hook pin 17, and the auxiliary side plate 13'z times. By moving the hook K, the set lever and the hook bin are engaged, and the hook bin is set in a fixed position as shown in the first figure.

According to the implementation sequence of and, in order to facilitate the removal of jammed paper, especially jammed paper wrapped around a roll, it is assembled as a single unit into the member r auxiliary side plate 13 on the downstream side of conveyance of the transfer paper, and this unit is pivoted (centered on r fulcrum 12). (see Figure 3), and is removable. At this time, it is natural that if the pressure between the rollers is released as shown in FIG. 3, it will be easier to remove the jammed paper.

Effects As explained above, if the present invention is widely used, the pressure of the positive pressure roller can be easily reset. A pressure mechanism in a fixing device is provided.

(Example) It is extremely easy to install and replace the fixing device components, heat roller, and pressure roller.

c) Removal of the jam paper is simple and easy, and can be made even easier by adding the effect 2 described in the above-mentioned item a).

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic side view of one embodiment of the fixing device of the present invention, FIG. 2 shows the main part of another embodiment of the pressurizing groove in the same device, and FIG. 1. Install the device shown in the figure, remove it from the rollers, and secure the auxiliary side plate unit. The released state (partially cut away) and FIG. 4 are printed views 1a of the pressure mechanism portion. t Side plate, 2... Heat roller, 3... Pressure roller, 4 Pressure lever, 5... Auxiliary lever, 6... Lever fulcrum, 7
Pressure spring, 8...Stopper bin, 9...Turn lever, 10...Lever fulcrum bin, 11...Clamp bin, 12...Auxiliary side plate fulcrum, 13...Auxiliary side plate, 14.15.・Pull-out roller, 16.. Auxiliary side plate set lever 117.. Hook bin, 18.. Separation claw, 29.. Pressure roller bearing, 30.. Heat roller bearing, 3L, 32.. Bearing fitting hole, 33.・Communication groove. Agent Patent Attorney Makoto Kon

Claims (1)

[Claims] ■) In a fixing device consisting of a heat roller and a pressure roller, a pressure lever, an auxiliary lever, and an auxiliary lever are provided that all share one support shaft, and one of the levers is separated from the support shaft. A stopper is installed at the location, a spring is installed between both levers, and both bar trays are rotated relative to each other until they come into contact with the stopper. By supporting the roller, supporting the holder, and resetting it, the pressure lever uses the spring to force the pressure roller to press against the tray heating roller side, and also to completely release the pressure roller. A pressurizing device with special features. 2) The outer diameter of the bearing of the heat roller is set to be the same as the diameter of the roller, and the bearing is removably fixed to a hole of the same diameter drilled in the frame of the device, and the roller is pressurized. When the heat roller is released and removed from the bearing assembly frame, the heat roller can be attached and detached from the side of the frame through the bearing attachment hole. It has a completely continuous structure with the drilled pressure roller bearing mounting hole and heat roller bearing mounting hole, so that after removing the heat roller, the pressure roller can also be attached and removed from the frame side by passing it through the heat roller bearing mounting hole. A patented device characterized by: 4) The fixing device is constructed as a separate unit with a frame i, in which the separation claw of the transfer paper feeding mechanism 11, a full-out roller, etc. The force I] pressure device according to claim 1, characterized in that it is freely adjustable.