JPH06280750A - Pump device and anchoring device - Google Patents

Abstract

PURPOSE:To provide a pump device, which is constituted to prevent displacement of a tube regardless of the temperature change of conveying liquid and prevent the stop of conveyance of liquid and breakage of a tube, through simple constitution at a low cost. CONSTITUTION:A connection member 10 is joined with the terminal part Q of a tube 1. The maximum diameter D of a joint with the connection member is increased to a value higher than the diameter W of the inlet A of a pump housing 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device for transporting a liquid, and particularly in a state in which a pressing member is pressed against a part of the outside of an elastic pipe tube, the pressing member is moved in the longitudinal direction of the tube. The present invention relates to a pump device of a system that conveys the liquid in the tube by sliding the liquid in the tube.

Further, the present invention relates to a fixing device used in an electrophotographic device, an electrostatic recording device and the like, and more particularly, a releasing agent coating device for preventing toner and the like from being offset on a heating roller and a pressure roller. The present invention relates to a fixing device provided.

[0003]

2. Description of the Related Art In a state where a pressing member is pressed against a part of the outside of a pipe tube having elasticity for transporting a liquid, the pressing member is slid in the longitudinal direction of the tube, The pump device that conveys the liquid is widely used.

In such a pump device, the tube itself is drawn into the pump by the sliding motion of the pressing member, and the tube causes a Z (Zet) fold in the pump, so that the liquid cannot be conveyed. , The tube may be damaged.

In order to avoid the phenomenon that the tube itself is pulled into the pump body, the pressing member often holds the outer circumference of the tube outside the pump body.

5 and 6 show an example of such a pump device. In the figure, 1 is an elastic tube that conveys liquid, 2 is a pressing member that applies a pressing force to the outside of the tube 1, 3 is a holder that holds the pressing member 2, 4a and 4b are pump housings, Reference numeral 5 is a gear that rotates integrally with the cage 3 to transmit the drive, 6 is a spring that biases the pressing member 2, and 7 is for holding the tube 1 to prevent the tube 1 itself from being displaced. A holding member, S is a liquid conveyed in the tube 1, 8 is a tank in which the liquid S is stored, A is an inlet of the tube 1 in the housing 4b, and B is an outlet of the tube 1 in the housing 4b.

The tube 1 is installed along the inner peripheral surfaces of the housings 4a and 4b, and one end thereof is immersed in the liquid S in the tank 8. On the other hand, the pressing member 2 rotatably held by the cage 3 is pressed against the tube 1 by the spring 6. The tube of the portion which receives the force by the pressing member 2 is crushed, and the inner diameter cross-sectional area of the tube 1 is zero. Therefore, when the pressing member 2 rolls while crushing the tube 1 by rotating the gear 5 clockwise by the drive source (not shown) and rotating the retainer 3 clockwise, the liquid S in the tank 8 It will be transported in the tube.

Further, the tube 1 is located outside the outlet A of the housing 4b, and the tube 1 itself is
4b is supported in a state in which the outer peripheral portion is sandwiched by the sandwiching member 7 so as not to be displaced (retracted) into the inside of the tube 4b. The S flow path is secured. In other words, the dimension of the holding member 7 is set such that the force T that displaces the tube 1 when the pressing member 2 rolls while crushing the tube 1 is smaller than the holding force P of the holding member 7. And P (holding force)> T.

Therefore, in the above apparatus, the tube 1 is displaced (pulled in) inside the housings 4a and 4b as shown in FIG.
(Zet) The liquid does not break, and the liquid transfer does not stop. Further, the tube is not damaged by the stress, and the liquid can be stably transported.

Next, another conventional example will be described. In order to make the unfixed toner image formed on the recording material a permanent image, the nip portion formed between the fixing roller heated by a heater or the like and the pressure roller rotating in pressure contact with the fixing roller is used. A fixing device that conveys a recording material under pressure is often used in image forming apparatuses such as copying machines and laser printers.

In such a fixing device, a part of the unfixed toner on the recording material adheres to the fixing roller or the pressure roller at the time of conveying under pressure, and this is again transferred to the next recording material to form an image. A so-called offset phenomenon, which causes stains, may occur.

In order to avoid stains due to the offset phenomenon and deterioration and shortening of the life of the fixing roller and the pressure roller,
In many cases, a release agent such as silicone oil for preventing the offset is applied to the fixing roller.

FIG. 16 shows an example of a conventional fixing device having such a release agent coating device. In FIG. 16, 10
1 is a fixing roller having a heater (not shown) inside,
A pressure roller 102 is in pressure contact with the fixing roller 101 and is driven to rotate. At the pressure contact portion (nip portion) formed between the pair of rollers 101 and 102, the unfixed toner image is fixed as a permanent image by conveying the recording material having the unfixed toner image with heating and nip. It

The fixing roller 101 is provided with a rotatable application roller 103 which contacts the fixing roller 101 at a predetermined time at a predetermined position and applies a release agent to the fixing roller 101. A part of the coating roller 103 is immersed in a mold release agent S such as silicone oil in the container 104 and rotated to draw up the mold release agent and supply it to the coating roller 103. ing.

A tank 10 for the release agent S is provided outside the fixing device.
6, the mold release agent S is replenished to the container 104 by the pump 108 via the tube 107 connected to the container 104, and the mold release agent S in the container 104 is maintained at a predetermined amount. ing. Thus, the release agent S is applied to the fixing roller 101 by the application roller 103, and the offset phenomenon is prevented.

[0016]

However, the above-mentioned conventional example has the following problems. First, according to the conventional example shown in FIGS. 5 and 6, since the tube 1 is sandwiched by the sandwiching member 7 with the outer peripheral portion thereof sandwiched, the hardness of the tube 1 depends on the temperature of the liquid S flowing in the tube 1. The holding force of the sandwiching member 7 may change when the value of γ changes. That is, when the temperature of the liquid S rises, the holding force P decreases and may become smaller than the force T that displaces the tube 1 when the pressing member 2 rolls while crushing the tube 1. That is, P (holding force) <T.

As a result, the tube 1 itself is moved to the housings 4a, 4 by the sliding operation of the pressing member 2.
There is a case where the tube 1 is pulled into the inside of the tube b, Z-folds in the pump, the liquid S cannot be transported, and the tube 1 is damaged.

Further, according to the conventional apparatus shown in FIG. 16, since the container 104 is opened upward, the mold release agent S in the container 104 is contained in the container 104 when the apparatus is tilted or the apparatus is moved. It may spill outside and enter important devices such as a developing device and a transfer device, which may impair its function. Therefore, it is impossible to adopt the above-mentioned apparatus as the fixing device of the small-sized image forming apparatus that can be easily moved or tilted by the user. Also,
The release agent is vaporized from the opening and floats inside the apparatus and is liquefied again at the low temperature part, which impairs the function inside the apparatus and causes contamination.

Further, in the conventional example shown in FIG. 16, since a mechanism such as a scooping roller or felt for supplying a release agent to the coating roller for coating the fixing roller is required,
The structure was complicated, and there were many difficulties in terms of weight reduction and cost reduction.

Further, in order to supply the releasing agent to the drawing roller, the releasing agent storage container stores more releasing agent than necessary, and the releasing agent is pumped out by the rotation of the drawing roller. Due to this, there was a spillage from the container, and there was a drawback that the release agent adhered to the periphery. Further, when the image forming apparatus main body is inadvertently tilted, the release agent in the container spills and stains the inside of the apparatus main body.

The first object of the present invention is to solve the above-mentioned problems and to prevent the position of the tube from being displaced regardless of the temperature change of the liquid to be transferred, thereby stopping the liquid transfer or damaging the tube. It is to provide a low cost pump device with a simple structure and at low cost.

A second object of the present invention is to solve the above problems and to be applicable to a small-sized image forming apparatus. Even if the image forming apparatus is moved or tilted, the release agent does not flow out and the release agent is released to the outside of the apparatus. An object of the present invention is to provide a fixing device that does not scatter the agent.

A third object of the present invention is to solve the above problems and to provide a fixing device capable of omitting the pumping roller and increasing the cost and preventing the release agent from leaking.

[0024]

According to the first invention of the present application,
The first object is provided with an elastic pipe tube and a pressing member that is slidably arranged in the longitudinal direction of the pipe tube while pressing the pipe tube, and conveys the liquid in the pipe tube. In the pump device, a connecting member for connecting to another tube body is joined to the inner wall of the end portion of the pipe tube on the liquid carry-in side, and the outer wall of the end portion is the pipe between the connecting member and the pipe member. This is achieved by being in contact with a support member that sandwiches the tube.

According to the second invention of the present application, the second object is a roller pair of a fixing roller heated by a heating source and a pressure roller rotating in pressure contact with the fixing roller,
A coating member that applies a release agent for offset prevention to at least one roller of the roller pair, a container that supplies the release agent to the coating member, and the coating member that is movable to and from the rollers. In a fixing device having a contacting / separating mechanism for pressing, the coating member changes a relative position with respect to the releasing agent storage chamber by a contacting / separating operation with respect to the roller in the releasing agent storage chamber communicating with the container. Is installed,
This is achieved by changing the relative position by electrically or mechanically switching supply and stop of the release agent from the container to the release agent storage chamber.

Further, according to the third invention of the present application, the third object is a roller pair of a fixing roller heated by a heating source and a pressure roller rotating in pressure contact with the fixing roller, and the roller pair. In a fixing device having a coating means for coating a release agent for offset prevention on at least one of the rollers, and the coating means is a coating member arranged in contact with the roller so as to be endlessly movable, and the coating member. Achieved by including a coating blade disposed so as to be in pressure contact with the release agent, and a release agent storage container that allows the release agent stored in the inclined bottom portion to contact and be supplied to the coating member by the weight of the release agent. To be done.

[0027]

According to the first invention of the present application, when the pressing member slides in the longitudinal direction of the pipe tube while pressing the pipe tube, the liquid in the pipe tube is conveyed.
At the same time, a force acts to pull the pipe tube in the sliding direction. However, the inner wall of the end portion of the pipe tube on the side of the liquid carry-in port is joined with a connecting member with another tube body, and the outer wall of the end portion connects the pipe tube with the connecting member. Since it is in contact with the sandwiching support member,
When the force pulling the pipe tube in the sliding direction acts, the pipe tube is sandwiched between the connecting member and the support member and is not pulled in.

Further, according to the second aspect of the present invention, when the coating member moves so as to contact the roller, the coating member moves in the release agent storage chamber relative to the release agent storage chamber. A signal is electrically sent to supply the release agent from the container to the release agent storage chamber, or a communication opening between the container and the release agent storage chamber is mechanically opened. Therefore, the release agent reaches the release agent reservoir, and the release agent is applied to the roller. Further, when the coating member moves away from the roller, the coating member relatively moves in the opposite direction to the inside of the release agent storage chamber to move from the container to the release agent storage chamber. An electric signal is sent to stop the supply of the release agent, or the communication opening is mechanically closed. Therefore, the supply of the release agent to the release agent storage chamber is cut off, and the release agent does not flow out even when the device is tilted.

Further, according to the third invention of the present application, the release agent stored in the release agent storage container is contact-supplied to the coating member by its own weight by the inclined bottom portion of the release agent storage container,
By the endless movement of the coating member, the coating member is conveyed to a pressure contact portion with the coating blade. At the pressure contact portion, the release agent is leveled by the coating blade on the surface of the coating member, and the release agent is conveyed to the contact portion with the fixing roller by the endless movement of the coating member and applied to the roller. It As described above, according to the present invention, since the release agent is directly supplied to the coating member without using the scooping roller, there is no need to store an excess release agent in the release agent storage container, Prevent mold leakage.

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a configuration of a first embodiment device combined with a fixing device of an image forming apparatus, FIG. 2 is a sectional view of the first embodiment device, and FIG. 3 is an enlarged view showing a tube joint portion.

In FIGS. 1 to 3, reference numeral 1 is a tube having elasticity for conveying a liquid, and 2 is a pressing member for applying a pressing force to the outside of the tube 1. The pressing member 2 is a retainer 3
It is rotatably held at the tip end thereof and is biased by a spring 6 with a predetermined pressure. 4a and 4b are the housings of the pump, and the tube 1 is the housings 4a and 4b.
Are arranged along the inner peripheral surface of. Therefore, the spring 6
The pressing member 2 biased by means of applying a predetermined pressing force to the tube 1 supported on the inner peripheral surface. A gear 5 is connected to the retainer 3 as shown in FIG. 1, and the gear 5 transmits the drive from a drive source (not shown) to the retainer 3 to cause the retainer 3 to operate. It is designed to rotate in the direction.

S is a liquid conveyed in the tube 1, and is oil as a release agent in this embodiment.
Reference numeral 8 is a tank in which the oil S is stored. A is the inlet of the tube 1 in the housing 4b. B is the outlet of the tube 1 in the housing 4b. Q is the end of the tube 1 that has passed through the pump body. 9
Is a flow path formed by another tube for transporting the oil S from the tank 8 to the tube 1, and is immersed in the oil S in the tank 8. 10 is the terminal portion Q
And a connecting member for connecting the above-mentioned flow path 9 with each other.

Further, as shown in FIGS. 2 and 3, the maximum diameter of the joint portion of the tube end portion Q with the connecting member 10 is represented by D, and the hole diameter of the inlet A is represented by W. There is. Further, the force for shifting the position of the tube 1 generated when the pressing member 2 rolls while crushing the tube 1 is shown in FIG.
It is represented by.

The pump device as described above is connected to a fixing device as shown in FIG. 1, and a fixing roller 11 and a pressure roller 12 are arranged in the fixing device. An oil applying roller 13 for applying oil S to the fixing roller 11 is disposed above the fixing roller 11 so as to contact the oil applying roller 13, and the oil S is supplied to the oil applying roller 13. The scooping roller 14 is disposed so as to abut. The pumping roller 14 is immersed in the oil S of the case 15, and the case 15 is connected to the tube 1 of the pump device.

In the apparatus of this embodiment as described above, the tube 1 in the housings 4a and 4b is crushed at the portion receiving the force by the pressing member 2, so that the inner diameter cross-sectional area of the tube 1 becomes substantially zero. When the cage 3 rotates in the clockwise direction, the pressing member 2 rolls while crushing the tube 1 and conveys the oil S in the tube 1 supplied from the tank 8 toward the case 15. .

Therefore, the tube 1 receives the force T in the direction of being drawn into the housings 4a and 4b as shown in FIG. 3, but at this time, outside the inlet A of the housing 4b, the tube end portion Q of the tube 1 is removed. The maximum diameter D of the joint portion with the connecting member 10 is larger than the hole diameter W of the inlet A,
That is, D> W, which prevents the tube 1 from being drawn into the housings 4a and 4b.

That is, even if the force T for shifting the position is generated, since the tube 1 itself is sandwiched between the housing 4b and the connecting member 10, the tube 1 is fixed and is not displaced.

Further, since the fixing roller 11 is kept at a high temperature by a heater (not shown), the oil applying roller 13 and the scooping roller 14 are also heated to a temperature close to that temperature, so that the inside of the oil case 15 is heated. The temperature of the oil S also rises. As a result, the hardness of the tube 1 that conveys the oil S and the flow path 9 may be reduced, and the above positional deviation may occur. The tube 1 and the flow path 9 are fixed and are not displaced.

Thus, when the liquid is conveyed by the pump of this embodiment, the tube 1 and the flow path 9 are displaced (pulled in) inside the housings 4a and 4b as shown in FIG. It does not occur and the liquid transfer does not stop. Further, the tube is not damaged by the stress, and the liquid can be stably transported.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, 10 is a connecting member for connecting the end portion Q and the flow path 9 and the tip portion is tapered. The inlet A of the tube of the housing 4b is also tapered. D is the maximum diameter of the joint between the tube end portion Q and the connecting member 10. d
For example, it is the minimum diameter of the tube end portion Q with the connecting member 10. W is the maximum hole diameter portion of the inlet A of the tube 1 in the housing 4b. w is the minimum hole diameter portion of the inlet A of the tube 1 in the housing 4b. Further, H is the height dimension of the tapered shape of the inlet A. Further, h is the height dimension of the tapered portion of the tube end portion Q that joins with the connecting member 10. In the above configuration,
The magnitude relationship among the dimensions of d, w, D, and W was defined as follows.

[0043]

## EQU1 ## d <w <D w <W (W−w) / H = (D−d) / h

As a result, the force T for shifting the position is generated, and even if the joining portion between the terminal end portion Q of the tube 1 and the connecting member 10 is pressed against the inlet A of the tube of the housing 4b, the joining portion is Since the inlet A and the inlet A have the same tapered shape, the tube 1 is not locally stressed. Therefore, it is possible to prevent the tube 1 from being damaged even when the force T for shifting the position is large.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those of the conventional device shown in FIG. 16 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 7 is a partially cutaway perspective view showing the structure of the third embodiment, FIG. 8 is a cross-sectional view of the apparatus of FIG. 7, showing the standby state of the apparatus main body, and FIGS. It is a figure which shows a state.

As shown in FIGS. 7 to 10, the lid 117
There is a hole 115 at the lower end of the container 116 containing the more injected mold release agent S, and the mold release agent S flows into the second chamber 113 through the hole 115. Also, the hole 1
A check valve 114 is provided in front of 15. Further, in front of the second chamber 113, there is a first chamber 112, and a communication opening between the first chamber 112 and the second chamber is a valve 1 urged by a spring 111.
It is designed to open and close with 10. Further, the tip end of the valve 110 is a coating member 109 through which the release agent S can penetrate.
Is fixed.

The container 116 as described above is attachable to and detachable from the holder 118, and is attached by the arrow A.
The holder 118 can be swung about a fulcrum 122, and can be swung at any time by a cam 119 contacting the holder 118. The cam 119 is constantly pulled by the spring 121, and at the same time, the solenoid 120 is pulled.
Are connected.

When an electric signal is emitted from the main body (not shown) in the standby state as shown in FIG. 8,
The solenoid 120 is pulled and the cam 119 starts rotating.
As shown in FIG. 9, the holder 118 abutting on the cam 119 rotates together with the container 116 around the fulcrum 122, and accordingly, the coating member 109 abuts on the fixing roller 101, and the coating member 109 is pressed to force the spring 111. To cancel the valve 1
Open 10. Here, the release agent S is the second chamber 11
3. Flow into the first chamber 112.

As the cam 119 further rotates, the check valve 114 acts to push the release agent S in the second chamber 113 toward the first chamber 112, and the valve 11
0 closes the hole 115 as shown in FIG. Therefore, the supply of the release agent S is cut off, and only a predetermined amount of the release agent S accumulated in the first chamber 112 and the second chamber 113 permeates from the abutting application member 109 and is applied to the fixing roller 101. .

After the fixing is completed, the solenoid 120 is turned off, and the spring 121 returns to the standby state as shown in FIG. At the same time, the application of the coating member 10 by the action of the spring 111.
9 is separated from the fixing roller 101, the valve 110 is closed, and the release agent S is sealed.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, Example 1
The same parts as in FIG.

FIG. 11 is a partially cutaway perspective view showing the structure of the fourth embodiment, FIG. 12 is a sectional view showing the standby state of the fifth embodiment, and FIG. 13 is a sectional view showing the fixing state.

In this embodiment, 123 is a cylindrical valve having a flow path 128 opened therein. The container 1 corresponding to the flow path 128 opened by the valve 123 and containing the release agent S
Holes 125 are formed on the 16 side and the coating member 109 side, respectively. In the standby state shown in FIGS. 11 and 12, the flow path 128 of the valve 123 is operated by the action of the spring 124.
Is fixed in a closed state without corresponding to the hole 125.

On the other hand, as in the third embodiment, the solenoid 120
Thus, when the container 116 rotates about the fulcrum 122, the cam 127 fixed to the end of the valve 123 contacts the stopper 126 fixed to the device to rotate the valve 123. As a result, as shown in FIG.
25 is aligned on a straight line, and the release agent S is applied to the fixing roller 101 from the applying member 109 through the flow path 128.

After completion of fixing, the cam 119 is rotated by the action of the spring 121 when the solenoid 120 is turned off, and the container 1
16 rotates about the fulcrum 122, and the coating member 109 separates from the fixing roller 101. At the same time, the stopper 126
The cam 127 is separated from the valve 123 by the action of the spring 124.
Rotates to close the flow path 128 and stop the supply of the release agent S.

<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 14 is a sectional view showing the structure of the fifth embodiment. In FIG. 14, when the liquid level sensor 129 detects that the liquid level of the release agent S in the container 116 has dropped, a pump (not shown) operates to store the release agent S in a tank (not shown). It is supplied more and the liquid level is always kept constant.
At this time, when the solenoid 120 is turned on, the container 11
6 rotates about the fulcrum 122, and thereafter, the releasing agent S is applied to the fixing roller 101 from the applying member 109 as in the third embodiment. After the fixing is completed, the solenoid 120 is turned off.
The release agent S is FFed and pushed up by the action of the spring 121.
Supply stops.

<Sixth Embodiment> Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 15 is a sectional view showing the structure of the sixth embodiment. As shown in FIG. 15, as in the third to fifth embodiments, the coating member 109 is brought into contact with the fixing roller 101 by the solenoid (not shown) to press the spring 111 and the coating member 10 is pressed.
The switch lever 132 fixed to 9 is pushed. At this time,
Switch 131 connected to pump (not shown) is ON
Then, a predetermined amount of the release agent S is supplied from a tank (not shown) containing the release agent S in advance through the pipe 130.

After completion of fixing, as in the other embodiments, the coating member 1
When 09 is separated from the fixing roller 101, the switch lever 132 is separated from the switch 131 by the action of the spring 111, and the switch 131 is turned off, so that the supply of the release agent is stopped.

<Seventh Embodiment> Next, a seventh embodiment of the present invention will be described with reference to FIG. In FIG. 17, 101 is a fixing roller, and this fixing roller 101 has a pressure roller 102.
Are pressed to rotate in a driven manner. The recording material having an unfixed toner image is heated and nipped and conveyed to a pressure contact portion formed between the pair of rollers 101 and 102 to fix the unfixed toner image.

An application roller 203 is rotated in pressure contact with the fixing roller 101 in order to apply a release agent S such as silicone oil to prevent offset. In addition, a release agent container 205 for applying the release agent S to the application roller 203 is disposed with the release agent sealing member 204 in contact with the application roller 203.

Since a predetermined amount of the release agent S such as silicone oil is stored in the release agent container 205, the release agent container 20 is pumped up from the release agent bottle (not shown) by the pump 207.
It is replenished from the injection hole 208 of No. 5. At this time, the release agent S in the release agent container 205 is kept at a predetermined amount by detecting the liquid surface by a detection method such as floating.

The release agent S in the release agent container 205 is in contact with the coating roller 203, and the coating blade 212 in pressure contact with the coating roller 203 forms a release agent coating layer having a uniform thickness. By forming a coating layer having this uniform thickness, a uniform release agent layer can be obtained on the surface of the fixing roller 101, so that a minimum amount of release agent can be applied without causing an offset phenomenon. Therefore, it is possible to provide a fixing device that does not stain the recording material with the release agent.

Further, the release agent S remaining on the application roller 203 after being applied to the fixing roller 101 by the application roller 203 is applied to the application roller 203 and the release agent sealing member 204.
Since they are in contact with each other, a small amount of the release agent is scraped off from the application roller 203 by the seal member 204 and falls and is stored in the tray 209 below.

Further, if the length of the coating blade 212 in the longitudinal direction is made longer than the length of the coating roller 203, the minute amount of the release agent scraped off by the coating blade 212 and flowing out to both ends thereof from the end portion of the coating roller 203. The mold release agent does not adhere to the surroundings by flowing down and accumulating in the lower tray 209 similarly.

<Embodiment 8> Next, an embodiment 8 of the invention will be described with reference to FIG. In addition, the same parts as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 18, the release agent container 213 is arranged with a gap of about 0.1 to 0.3 mm from the outer peripheral surface of the coating roller 203, and the pump 21 is inserted into the container 213.
4, the release agent in the oil bottle 215 is supplied.

At this time, after a predetermined amount of the mold releasing agent is stored in the container 213, a further amount of mold releasing agent flows down from the gap and the overflow hole 216, and the tray 217 below the container is provided.
Is temporarily stored in the oil pan 219, then flows out from the outlet 218 of the tray 217 and is stored in the oil pan 219 below the fixing device. The stored release agent can be pumped up again by the pump 214 and used.

In the case of this embodiment, a gap of about 0.1 to 0.3 mm is formed between the outer peripheral surface of the coating roller 203 and this, as described above.
17 is provided, and the oil pan 2
Since the configuration is returned to 19, if the flow path is preset for the release agent leakage, the seal need not be considered so much.

Further, in this configuration, when the fixing device is in operation, the pump operates and the release agent is stored in the container in a predetermined amount. However, once the operation is stopped, the gap between the coating roller and the container is stopped. Also, the release agent gradually flows down to the lower tray to empty the inside of the container, so that the release agent does not spill out even if the image forming apparatus main body is tilted.

<Ninth Embodiment> Next, a ninth embodiment of the present invention will be described with reference to FIG. In addition, the same parts as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 19, reference numeral 222 denotes a release agent coating sheet, which is made of a material having a good release property such as silicone rubber. The release agent coating sheet 222 is the drive roller 22.
0 and driven roller 221 uniformly drive the fixing roller 101 to apply the release agent.

On the driven roller 221, the coating sheet 222 is formed.
The coating blade 223 is pressure-contacted via the
It has a function of making the release agent on 22 uniform. Again 2
Reference numeral 24 is a container for storing the release agent, and the coating agent 222 is coated while storing a predetermined amount of the release agent in this container.

A release agent tray 225 is provided below the coating sheet 222 to temporarily store the release agent leaked from above.

By using the coating sheet 222 as described above, the positions of the coating blade 223 and the release agent storage container 224 can be freely set to some extent, so that the structure of the tray for the release agent leaking from the upper side can be freely set. There is.

[0078]

As described above, according to the first invention of the present application, since the pipe tube is sandwiched between the connecting member and the supporting member, even if the force T that displaces the pipe tube acts, The tube is fixed between the connecting member and the supporting member and is not displaced. Further, at this time, even if the hardness of the tube changes (for example, decreases) due to the change (for example, increase) of the temperature of the liquid, the tube is fixed and the position is not displaced regardless of the change in the hardness. Therefore, the liquid transfer can be stably performed without stopping the liquid transfer or the tube being damaged.

According to the second aspect of the present invention, the supply and stop of the release agent from the release agent container to the release agent storage chamber is switched in association with the contact and separation operation of the application member, and the application member is the fixing roller. Alternatively, since the release agent is supplied only when it comes into contact with the pressure roller, the release agent spills out even if the device is moved or vibrated, and an unexpected accident or function It does not cause a decline. Further, since it does not have an opening, it is effective in preventing the release agent from vaporizing by the fixing heater, reducing the consumption of the release agent, and preventing the inside of the main body from being contaminated. Further, since a roller for pumping up is not required, there is a degree of freedom in the arrangement within the fixing device, which is effective in reducing the size, weight and cost of the main body.

Further, according to the third invention of the present application, since the fixing roller or the pressure roller is provided with the container for supplying the releasing agent by directly contacting with the applying roller for applying the releasing agent or the applying sheet or the like. Since the means such as the scooping roller for supplying the release agent to the coating roller, which is conventionally used, is not required, the structure is simplified, and as a result, the weight reduction and the cost reduction can be realized. Further, since the release agent is directly contacted and supplied to the coating roller or the like, the release agent treatment for leakage of the release agent from both ends of the coating roller can be simplified. Further, since the amount of the release agent in the release agent storage container can be made small, the release agent is unlikely to spill out even when the apparatus main body is tilted.

[Brief description of drawings]

FIG. 1 is a perspective view showing a device according to a first embodiment of the present invention.

2 is a cross-sectional view of the device of FIG.

FIG. 3 is an enlarged view showing a tube joint portion of the apparatus shown in FIG.

FIG. 4 is a cross-sectional view showing a tube joint portion of a device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional device.

6 is a cross-sectional view of the device of FIG.

FIG. 7 is a partially cutaway perspective view showing a device according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of the apparatus of FIG. 7 showing a standby state.

9 is a cross-sectional view of the apparatus shown in FIG. 7, showing a moving process.

FIG. 10 is a cross-sectional view of the apparatus of FIG. 7 showing a state during fixing.

FIG. 11 is a partially cutaway perspective view showing a device of Example 4 of the present invention.

FIG. 12 is a cross-sectional view of the apparatus of FIG. 11 showing a standby state.

FIG. 13 is a cross-sectional view of the apparatus of FIG. 11 showing a state during fixing.

FIG. 14 is a sectional view of a device according to a fifth embodiment of the present invention.

FIG. 15 is a sectional view of a device according to a sixth embodiment of the present invention.

FIG. 16 is a partially cutaway perspective view showing a conventional device.

FIG. 17 is a diagram showing an apparatus according to Example 7 of the present invention.

FIG. 18 is a diagram showing an apparatus according to Example 8 of the present invention.

FIG. 19 is a diagram showing an apparatus according to Example 9 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe tube 2 Pressing member 4b Housing (supporting member) 9 Flow path (other tube body) 10 Connecting member Q Terminal part (liquid carrying-in side end part) S Oil (liquid) 101 Fixing roller 102 Pressure roller 109 Coating member 111 Container 112 First Chamber (Release Agent Storage Chamber) 113 Second Chamber (Release Agent Storage Chamber) 119 Cam (Contact / Separation Mechanism) 121 Solenoid (Contact / Separation Mechanism) 203 Coating Roller (Coating Member) 205 Release Agent Container (Releasing agent storage container) 222 Coating sheet (coating member)

Claims (6)

[Claims] 1. A pump device comprising an elastic pipe tube and a pressing member that is slidably arranged in the longitudinal direction of the pipe tube while pressing the pipe tube, and conveys the liquid in the pipe tube. At
On the inner wall of the end of the pipe tube on the liquid carry-in side,
A pump device, wherein a connecting member to another tube body is joined, and an outer wall of the end portion is in contact with a supporting member sandwiching the pipe tube with the connecting member. 2. The pump device according to claim 1, wherein a maximum diameter of a joint portion of the end portion of the pipe tube on the liquid carry-in side with the connecting member is larger than a diameter of a contact portion with the supporting member. 3. A release agent for offset prevention is applied to a roller pair of a fixing roller heated by a heating source and a pressure roller rotating in pressure contact with the fixing roller, and at least one roller of the roller pair. In the fixing device, there is provided a coating member, a container for supplying a release agent to the coating member, and a contacting / separating mechanism for moving the coating member with respect to the roller in a freely movable manner. In the release agent storage chamber that communicates with the release agent storage chamber, the relative position with respect to the release agent storage chamber is arranged so as to be changed by the contacting / separating operation with respect to the roller. A fixing device characterized by electrically or mechanically switching supply and stop of a release agent to a release agent storage chamber. 4. A fixing agent according to claim 3, wherein the releasing agent storage chamber provided with the coating member and the container containing the releasing agent are integrated and are detachably arranged from the fixing device main body. apparatus. 5. A release agent for offset prevention is applied to a roller pair of a fixing roller heated by a heating source and a pressure roller rotating in pressure contact with the fixing roller, and at least one roller of the roller pair. In the fixing device having the coating means, the coating means is inclined with respect to the coating member which is in contact with the roller and is endlessly movable, and the coating blade which is arranged so as to be in pressure contact with the coating member. A fixing device, comprising: a release agent storage container that allows the release agent stored in the bottom portion to contact and be supplied to the coating member by the weight of the release agent. 6. A flow path according to claim 5, wherein a release agent is supplied to the container when the fixing device is in operation, and the release agent in the container is below a predetermined amount when the fixing device is stopped. Fixing device.