JPH0559476U - Fixing device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a fixing device having a simple structure and capable of carrying out jam processing without having to worry about separation claws. [Structure] Separation claws 6 and 7 that come into contact with the heating roller 1 and the pressure roller 2 are fixedly supported on a jam processing cover, and a claw cover 8 is provided on the jam processing cover to cover both separation claws 6 and 7. And an uncover position where both separation claws are exposed, and a claw cover 8 urged by a spring 10 to a stopper 11 at the cover position is received while the jam clearance cover is closed from the open position to the closed position. The part 12 receives it at a predetermined position and moves it from the cover position to the uncover position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing device.

[0002]

[Prior Art]

 For example, in electrostatic copying machines and printers, a fixing device is used to fix a toner image attached to a recording medium such as paper or film onto the recording medium. As a fixing device, a so-called heat roller fixing device including a heating roller and a pressure roller facing the heating roller is often used.

In this type of fixing device, in order to prevent the recording medium from wrapping around the heating roller and the pressure roller, a separation claw that contacts the heating roller and a separation claw that contacts the pressure roller are provided. .. These separating claws may be fixedly installed on the heating roller or the pressure roller, or may be provided so as to be movable back and forth with respect to the heating roller or the pressure roller.

Further, when the separation claw is fixedly installed on the heating roller or the pressure roller, when the pressing roller is fixedly installed on the heating roller, or when the separation claw is fixed on the heating roller. Can be categorized as being able to move forward and backward.

When the separating claw is provided so as to be displaceable with respect to the heating roller and the pressure roller, the separating claw is generally supported by the jam clearance cover. However, the separating claw is supported by the jam clearance cover. It is rotatably or swingably supported, and for example, the separation claw is stored in the jam processing cover when the jam processing cover is opened by interlocking with opening and closing of the jam processing cover via a link mechanism or a gear mechanism. It can be classified into a case where it is configured as described above and a case where the separation claw is fixedly supported by the jam clearance cover.

[0006]

[Problems to be solved by the device]

 When the separation claw is fixedly installed on the heating roller or the pressure roller, and the pressure roller is fixedly installed on the heating roller, it is difficult to remove the jam generated in the fixing device. When the recording medium is wrapped around the heating roller or the pressure roller, the recording medium may not be removed.

In addition, when the separation claw is fixedly installed on the heating roller or the pressure roller and the pressure roller is displaceable with respect to the heating roller, the heating roller or the pressure roller is pressed during the jam processing. Since it is necessary to move the roller and it is difficult to ensure the accuracy of the positional relationship between the heating roller and the pressure roller during normal use, the contact pressure of the pressure roller becomes uneven depending on the contact position. The skew of the recording medium is likely to occur.

Further, when the separation claw is rotatably or swingably supported by the jam removal cover and the separation claw is moved into the jam removal cover when the jam removal cover is opened, the configuration becomes complicated. The number of parts also increases. Moreover, in this case, it is necessary to move both separating claws so as not to contact both the heating roller and the pressure roller, and therefore it is not possible to arrange both separating claws at symmetrical positions with respect to the recording medium conveyance path. The recording medium may be easily wrapped around either one of the rollers.

When the separation claw is fixedly supported on the jam removal cover, the separation claw is exposed when the jam removal cover is opened. Therefore, the jam removal is performed while being careful not to contact the exposed separation claw. It is necessary to do so, and there is a risk of injury due to the hand touching the exposed separation nail.

An object of the present invention is to provide a fixing device which has a simple structure and is capable of performing a jam process without worrying about the separation claw.

[0011]

[Means for Solving the Problems]

 The present invention provides a heating roller, a pressure roller arranged opposite to the heating roller, a heating roller and a jam processing cover that is opened and closed at the time of the jam processing, and a jam processing cover. It is fixedly supported and is fixedly supported by a separation claw that contacts the heating roller in the closed state to separate the recording medium from the heating roller, and is fixedly supported by the jam clearance cover, and contacts the pressure roller in the closed state to record from the heating roller. In order to achieve the above object, a fixing device having a separating claw for separating the medium has taken the following means. That is, the claw cover that is movably supported on the jam processing cover between the cover position that covers both separation claws from the toe side and the uncover position that exposes the separation claws, and the claw cover from the uncover position to the cover position. The spring for urging, the stopper for limiting the movement of the claw cover in the cover position direction at the cover position, the claw cover for catching the claw cover at a predetermined position during the closing from the open position to the closed position, and the above-mentioned spring. And a receiving portion for moving from the cover position to the uncover position against.

[0012]

[Action]

 According to the present invention, the claw cover, the spring, and the receiving part are only added to the claw cover when the jam cover is opened, and the claw cover covers both separation claws. When the jam treatment cover is closed, the claw cover is separated. Is exposed and contacts the heating roller and pressure roller to prevent the recording medium from wrapping.

[0013]

【Example】

 Hereinafter, a fixing device according to an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a side view of an embodiment of the present invention during normal use, and FIG. 2 is a side view of an embodiment of the present invention during a jam process.

The heating roller 1 of the fixing device and the pressure roller 2 opposed to the heating roller 1 are rotatably supported by the main body frame 3, and a jam clearance cover which is opened and closed at the time of jam clearance is centered on the fulcrum 4 on one side thereof. Is swingably supported by.

A guide holder 5 is fixed to the jam treatment cover, and the guide holder 5 is brought into contact with the heating roller 1 in a closed state where the jam treatment cover is closed to separate the recording medium from the heating roller 1. The claw 6 and the separation claw 7 that comes into contact with the pressure roller 2 and separates the recording medium from the heating roller 2 are fixedly supported.

As shown in FIGS. 1, 2 and 3, the guide holder 5 has a cover position (FIG. 2) where the claw cover 8 covers both separation claws 6 and 7 from the toe side, and It is swingably supported around a fulcrum 9 over an uncover position (FIGS. 1 and 2) where the separation claws 6, 7 are exposed, and the claw cover 8 is swung in the direction from the uncover position to the cover position. A biasing spring 10 is provided. Further, the guide holder 5 is provided with a stopper 11 that limits the swing of the claw cover 8 to the cover position.

Further, the main body frame 3 receives the pawl cover 8 at a predetermined position while swinging the jam clearance cover from the opened open position to the closed position and closes the jam cover 8 at a predetermined position to protect the jamming cover from the spring 9. A receiving portion 12 is provided for moving the cover position from the cover position to the uncover position.

In this fixing device, in a normal state in which the jam clearance cover is located at the closed position, as shown in FIG. 1 or 3, the claw cover 8 is received by the receiving portion 12 and is located at the anchor cover position, and is separated. The claw 6 is in contact with the heating roller 1 and the separation claw 7 is in contact with the pressure roller 2.

When the jam clearance cover is opened for jam clearance, the separation claws 6 and 7 are separated from the heating roller 1 and the pressure roller 2, and the separation claws 6 and 7, the heating roller 1 and the error roller are separated. It is possible to easily take out the paper jammed in the fixing device, the paper wound around the heating roller 1 or the pressure roller 2, and the like by putting a hand between the paper and the roller 2.

When the jam clearance cover is opened, the claw cover 8 is urged by the spring 10 until the jam clearance cover is opened to a certain extent and is not received by the receiving portion 12, but swings from the uncover position to the cover position. Move. Then, when the jam clearance cover is opened to a certain extent or more, it is received by the stopper 11 instead of the receiving portion 12 and held at the cover position.

At this cover position, since the separation claws 6 and 7 are covered by the claw cover 8 from the toe side, the separation claws 6 and 7 come into contact with another object and the claws are damaged, and the separation claws are separated. There is no risk that the toes of the release claws 6 and 7 will hurt an operator's hand.

Therefore, the operator can open the jam clearing cover without paying attention to the contact between the separating claws 6 and 7 and the hands or other objects, and the jam clearing work can be performed. It becomes easier and the workability is improved.

When the jam clearance cover is returned from the open position to the closed position after the jam clearance, the claw cover 8 is received by the receiving portion 12 and automatically swings from the cover position to the uncover position. All you have to do is close the jam clearing cover, work is easy, and workability is high.

Moreover, the jam removal cover only supports the separation claws 6, 7, the claw cover 8, the spring 10 and the stopper 11, and the receiving portion 12 is provided on the main body frame 3, so that the link mechanism and the gear mechanism are provided. The configuration is simpler than that provided, and it can be implemented easily and inexpensively.

In the above-described embodiment, the claw cover 8 is configured to swing around the fulcrum 9, but the claw cover 8 covers the separation claws 6 and 7 from the toe side. It suffices that it is configured so as to move over the uncover position where both separation claws 6 and 7 are opened, and for example, it may be configured to perform linear reciprocating movement between the cover position and the uncover position.

[0027]

As described above, in the fixing device of the present invention, when the jam clearance cover is opened, the separating claw is separated from the heating roller or the pressure roller, and the separating claw and the heating roller or the pressure roller are separated from each other. You will be able to insert your hand between them. Therefore, the paper jammed in the fixing device and the paper wound around the heating roller and the pressure roller can be easily removed, and the jam processing becomes easy.

Further, when the jam clearance cover is opened, the separation claw is automatically covered by the claw cover from the toe side, so that the separation claw can be protected from contact with other objects and the operator's hand, and Not only can the worker's hand be prevented from being damaged by contact, but the jam clearance work can be performed without paying attention to the contact between the separation claw and the hand or other objects, and the jam clearance work becomes easier and Workability is enhanced.

Further, after the jam processing, the separation claws are returned to the normal state where they come into contact with the heating roller and the pressure roller simply by closing the jam processing cover, so that the work is easy and the workability is improved. ..

Moreover, the separation claws, the claw covers, the springs and the stoppers are supported by the jam clearance cover, and only the receiving portion supported by the body frame is provided. Therefore, the separation claws are jammed by the link mechanism or the gear mechanism. The structure is simpler than that of the conventional example housed in the cover, and can be implemented easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a side view of the present invention in normal use.

FIG. 2 is a side view of the present invention during jam clearance.

FIG. 3 is an operation diagram of the nail cover of the present invention.

[Explanation of sign]

 1 Heating Roller 2 Pressure Roller 6 Separation Claw 7 Separation Claw 8 Claw Cover 10 Spring 11 Stopper 12 Receiver

Claims (1)

[Scope of utility model registration request] 1. A heating roller, a pressure roller arranged to face the heating roller, a jam processing cover which is disposed on one side of the heating roller and the pressure roller and is opened / closed during jam processing.
A separation claw that is fixedly supported by the jam processing cover and contacts the heating roller in the closed state to separate the recording medium from the heating roller, and a fixing claw that is fixedly supported by the jam processing cover and contacts the pressure roller in the closed state to heat. In a fixing device provided with a separation claw for separating a recording medium from a roller, a claw movably supported between a cover position for covering both separation claws from a toe side and an uncover position for exposing both separation claws on a jam processing cover. Between the cover, the spring that urges the claw cover from the uncover position to the cover position, the stopper that restricts the movement of the claw cover in the cover position direction at the cover position, and between the jam clearance cover open position and the closed position. A receiving portion for receiving the claw cover at a predetermined position and moving it from the cover position to the uncover position against the spring. The fixing device.