JPS6349229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a release mechanism in a roller fixing device in an electrostatic copying machine.

In a pressure fixing device, a developed copy paper is supplied between a pair of rollers, and pressure fixing is performed by passing between the pair of rollers. In conventional pressure fixing devices, pressure remains applied between the rollers, and the pressure cannot be released by simple operation. Therefore, when a paper jam occurs between the rollers, much effort is required to remove the copy paper.

Therefore, the main object of the present invention is to provide a roller fixing device that can release the pressure between rollers in the roller fixing device with a relatively easy operation and easily return to the original pressure state. The purpose of the present invention is to provide a release mechanism.

The present invention includes: one roller pivotally supported on a base; another roller having an axis parallel to the one roller; a support member connected to one end of a spring; and a biasing force of the spring biases the support member such that the other roller contacts the one roller, and the biasing force of the spring is released to cause both rollers to move. an actuating means for separating the actuating means, a locking means for maintaining the actuating state of the actuating means, and a rocking body that is pivotally supported by a base body and is provided with a member that defines a paper conveyance path, and the rocking body rotates. In the roller fixing device, the biasing force of a spring of the actuating means is released in response to the roller being moved and released from the base body, and the pressure contact between the other roller and the one roller is released. It is a release mechanism.

In a preferred embodiment, the rocking body is provided with a guide part, the actuating means is pivotally supported on the base by a pivot, one end is connected to the other end of the spring, and the actuating means is connected to the other end of the spring on the opposite side with respect to the pivot. It is characterized in that the other end includes a link that engages with the guide portion and is interlocked with the rocking of the rocking body.

Further, in a preferred embodiment, the locking means includes a stopper portion that is provided on the base body and limits angular displacement of the link around the pivot axis when the spring is biased, and the stopper portion is configured such that when the spring biases the pivot shaft. The link is characterized in that the link is angularly displaced so as to be deviated from a straight line connecting the one end of the link and the other end of the support member.

Furthermore, in a preferred implementation, the one end and the other end of the support member are on the supply side and the discharge side, respectively, with respect to the axis of the other roller, the actuating means is on the discharge side of the roller, and the pivot shaft is mounted on a spring. It is characterized in that it is located at a position that deviates from the straight line toward the supply side when it is energized.

FIG. 1 is a front view of a pressure fixing device in an electrostatic copying machine according to an embodiment of the present invention, FIG. 2 is a view continuously showing the end face of each part in FIG. 1, and FIG. It is an exploded perspective view. A roller 6 having an axis perpendicular to the conveyance path of the copy paper is rotatably supported on the side walls 2 and 4 constituting the base of the pressure fixing device.
This roller 6 has a heater (not shown) inside it.
is inserted and heated during the fixing operation. A through hole 8 is formed in the side wall 2 . The shaft 12 of the roller 10 is loosely inserted into the through hole 8 .
The axis of the roller 10 is parallel to the axis of the roller 6, and in this embodiment the roller 10 is located below the roller 6.
will be provided. A support member 16 is pivotally supported on the side wall 2 by a pin 14 . The pin 14 has an axis parallel to the axes of the rollers 6,10. This pin 14 is located closer to the supply side (to the right in FIG. 1) of the copy paper conveyance path than the axis of the roller 10. Support member 1
A roller 10 is rotatably supported at 6. A bracket 20 is pivotally supported at the other end of the support member 16 by a pin 18 having an axis parallel to the pin 14.

The actuating means 70 uses a spring 24, which will be described later, to apply a spring bias to the support member 16 so that the roller 10 comes into contact with the roller 6 with a spring force. In this working means 70, the bracket 20 includes:
Adjustment bolt 22 is inserted. One end of a spring 24 is connected to the end of this bolt 22 . This bolt 22 has a spring 2 with respect to the bracket 20.
A nut 26 is screwed on the side opposite to 4.

The other end of the spring 24 is connected to a pin 30 fixed to one end of the link 28. Link 28 is
It is pivotally supported by a pivot 32 on the inner surface of the side wall 2 (the surface on the side wall 4 side). This pivot 32 is connected to the roller 10
parallel to the axis of Across between side walls 2 and 4,
A shaft rod 34 is provided further on the discharge side (left side in FIG. 1) than the pivot shaft 32 and below the axis of the roller 10. This shaft rod 34 includes swinging bodies 36, 3.
8 is supported for angular displacement.

At the other end of the link 28 on the opposite side from the pin 30 with respect to the pivot 32, a notch 40 is formed which is open toward the free end side. This notch 4
0, the guide portion 42 protruding from the rocking body 36 is loosely engaged.

The above-mentioned actuating means 70 is operated by the roller 10 and the roller 6.
and both rollers 6 and 10.
The locking means for separating the two will be explained below. An arc-shaped through hole 44 centered on the axis of the pivot 32 is bored in the side wall 2 . One end of this through hole 44 serves as a stopper portion 46 for the pin 30. When the pin 30 is in contact with the stopper portion 46, the axis of the pivot 32 is shifted toward the rollers 6 and 10 from the straight line connecting the pin 30 and the pin 18.

A locking rod 50 is fixed across the side walls 2 and 4. This locking rod 50 can be locked in a recess 54 that is open below the locking piece 52 . This locking piece 52 is connected to the rocking bodies 36 and 38 by a shaft 56.
is supported by A portion of the shaft rod 56 between the rocking bodies 36 and 38 has a square cross section perpendicular to the axis, and a handle 58 is fixed to this portion.

The structure related to the support member 16 and the actuating means 70 is the same on the side wall 4 side, and is omitted in FIG. 2 to simplify the drawing. A gear 72 for driving the roller 6 is fixed to the roller 6. The roller 6 is rotated clockwise in FIG. 1 during fixing.

The swinging bodies 36 and 38 are provided with discharge rollers 74 and 76 for discharging the copy paper fixed by the rollers 6 and 10 to the outside of the copying machine. Further, the oscillators 36 and 38 may be provided with a guide plate for guiding the copy paper that has been fixed, and may also be provided with a peeling claw or the like for peeling off the copy paper adhered to the roller 6. , the illustration of this guide plate and peeling claw is omitted.

When pressure fixing is performed, the state shown in FIG. 1 is used. At this time, the pin 30 is in contact with the stopper portion 46. The tension force of spring 24 urges support member 16 about pin 14 in a clockwise direction in FIG. Therefore, the roller 10 resiliently contacts the roller 6. As the developed copy paper passes between the rollers 6 and 10 in this manner, pressure fixing is performed. The straight line connecting pin 30 and pin 18 is on the discharge side (left side in FIG. 1) with respect to the axis of pivot 32, and the above-mentioned spring biased state is maintained.

If a paper jam occurs between the rollers 6 and 10 during pressure fixing, first push down the handle 58 and rotate the locking piece 52 around the shaft 56 in the counterclockwise direction in FIG. Remove the recess 54 from the locking rod 50. Therefore, the oscillators 36 and 38 are placed around the shaft 34 in a fourth position.
Pull it counterclockwise as shown by arrow 78 in the figure. Therefore, the guide portion 42 moves toward the free end side of the notch 40 of the link 28 while drawing a trajectory indicated by an imaginary line 60. At this time, the link 28 is angularly displaced about the pivot 32 in a clockwise direction in FIG. When the pin 30 abuts the other end 48 of the through hole 44, the link 28 is prevented from further angular displacement. In this state, the guide portion 42 can be removed from the notch 40 by further angularly displacing the rocking bodies 36, 38 around the shaft 34 in the counterclockwise direction in FIG. Angular displacement of the link 28 about the pivot 32 in a clockwise direction in FIG. 4 causes the pin 30 to be displaced toward the rollers 6, 10 and downward. Therefore, the spring 24 supports the support member 16 in a state where the tension force is released. In this way, roller 10 is displaced downward from roller 6, so that contact between roller 6 and roller 10 is broken. Therefore, copy paper jammed between the rollers 6 and 10 can be easily pulled out. At this time, the rocking body 3
6 and 38 are displaced toward the discharge side of the copying machine, so that a relatively large space is formed on the discharge side of the rollers 6 and 10. Therefore, it is easy to manually remove the jammed copy paper.

When performing the fixing operation again, the swinging bodies 36, 38 in the state shown in FIG. 4 are angularly displaced around the shaft 34 in the opposite direction of the arrow 78. The guide 42 follows the notch 40 so that the link 28 follows the pivot 32
Angular displacement is made in the counterclockwise direction in FIG. 4 with the center at .
In this way, the state returns to the state shown in FIG. The recess 54 of the locking piece 52 is locked to the locking rod 50, and the rocking bodies 36, 38
This reliably prevents inadvertent angular displacement around the shaft rod 34 in the direction of arrow 78. An enlarged surface 80 is formed at the free end of the notch 40, so that the notch 40
The guide portion 42 can easily fit into the hole.

A knob may be provided at the end of the shaft rod 56 protruding from the side wall 2 in place of the handle 58.

As described above, according to the present invention, one roller is pivotally supported on the base body, and the support member supporting the other roller is biased by the spring of the actuating means, so that the one roller is elastically supported. In addition, this elastic biasing state is released so that the other roller can separate from the other roller, so if a paper jam occurs between the rollers, can also be easily taken out.

Further, according to the present invention, the release mechanism in the roller fixing device of the present invention can be realized with a relatively simple configuration.

Furthermore, according to the present invention, the actuating means can be maintained in a state in which the other roller is in contact with the one roller and also in a state in which both rollers are separated, so that the abutment The state can be kept stable, the two rollers can be prevented from being separated inadvertently, and fixing can be performed reliably.

Furthermore, according to the present invention, the rocking body pivotally supported by the base body has a member that defines the paper conveyance path, and the rocking body can be rotated to be opened to the base body. Therefore, the bias of the spring of the actuating means is released, and the pressure contact between the pair of rollers is released, so that the paper jammed between the pair of rollers can be removed from the open space. It can be taken out and the workability is extremely good.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a continuously developed end view of the pressure fixing device shown in FIG. 1, and FIG. 3 is an exploded perspective view of the pressure fixing device shown in FIG. FIG. 4 is a front view for explaining the operation for removing a copy sheet that has caused a paper jam. 2, 4... Side wall, 6, 10... Roller, 16... Support member, 24... Spring, 28... Link, 32... Pivot,
34... Axial rod, 36, 38... Rocking body, 52... Locking piece.

Claims (1)

[Claims] 1. One roller pivotally supported on a base, another roller having an axis parallel to the one roller, supporting the other roller, one end of which is pivotally supported on the base, and the other roller a support member whose end portion is connected to one end of the spring; and a biasing force of the spring biases the support member such that the other roller contacts the one roller, and the biasing force of the spring is released. The apparatus includes an actuating means for separating both rollers, a locking means for maintaining the operating state of the actuating means, and an oscillating body that is pivotally supported by a base body and is provided with a member that defines a paper conveyance path. A roller characterized in that when the moving body is rotated and released from the base body, the biasing force of the spring of the actuating means is released, and the pressure contact between the other roller and the one roller is released. Release mechanism in the fixing device. 2. The rocking body is provided with a guide part, and the actuating means is pivotally supported on the base by a pivot, one end is connected to the other end of the spring, and the other end opposite to the one end with respect to the pivot is connected to the other end of the spring. 2. A release mechanism in a roller fixing device according to claim 1, further comprising a link that engages with said guide portion and moves in conjunction with rocking of a rocking body. 3. The locking means includes a stopper part that is provided on the base body and limits angular displacement about the pivot axis of the link when the spring is biased; Claim 2, characterized in that the link is angularly displaced so as to be deviated from a straight line connecting the link and the other end of the support member.
The release mechanism in the roller fixing device described in 2. 4. The one end and the other end of the support member are located on the supply side and the discharge side, respectively, with respect to the axis of the other roller, the actuating means is located on the discharge side of the roller, and the pivot shaft moves along the straight line when the spring is biased. 4. The release mechanism for roller fixing mounting according to claim 3, wherein the release mechanism is located at a position shifted toward the supply side.