JPH10279125A - Medium conveyance mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a medium from rubbing a pair of rollers when the medium is removed by providing a medium release means which moves in the interlocking relationship with the turn of a guide member and releases the medium nipped by the pair of rollers from the pair of rollers. SOLUTION: When a medium 1 is removed from a conveyance path, an operator opens an open guide 5, and a cam 5a of the open guide 5 moves a shaft 8 against energizing force of a plate spring to separate a pressure roller 4 from a feed roller 3. Then, a condition in which the medium 1 is nipped by the feed roller 3 and the pressure roller 4 is released. The operator takes the medium 1 out of the conveyance path without applying force. Moreover, since the feed roller 3 and the pressure roller 4 do not rub the medium 1 when the medium is removed, dirt of the feed roller 3 and the pressure roller 4 does not adhere to the medium 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium for transporting a medium.
The present invention relates to a medium transport mechanism including a pair of rollers and a guide for guiding a medium.

[0002]

2. Description of the Related Art Conventionally, in an apparatus such as a printing apparatus which needs to convey a medium, a paper is required to convey the medium.
A drawer and a pressure roller which is constantly pressed against the feeder are provided. The medium is held between the feed roller and the pressure roller, and the medium is transported by driving the pressure roller.

[0003] A plurality of pairs of rollers composed of the above-mentioned feed roller and pressure roller are provided at a predetermined distance from each other on a conveying path of a printing apparatus. A guide is provided between the pair of rollers to guide the medium so as not to deviate from the transport path.

In the above-described printing apparatus, the guide has an opening in the guide so that the medium on which the jam has occurred during the transfer can be easily removed from the transfer path. -Some are pun guides. A medium transport mechanism is constituted by a roller pair composed of a feed roller and a pressure roller, and a guide.

The open guide is rotatably mounted on a shaft of a feeder, and is normally positioned in a direction parallel to the medium being transported. When the medium is removed, the operator opens the open guide by rotating the open guide around the axis of the feeder, thereby opening the transport path, and allowing the operator to easily reach the transport path. The medium can be removed by insertion.

[0006]

In the above-mentioned conventional medium transport mechanism, when removing the medium from the transport path, the operator opens the open guide by rotating the open guide, and easily puts a hand in the transport path. However, if the medium is held between the feed roller and the pressure roller, there is a problem that a large force is required to pull out the medium. Further, in order to pull out the medium against the clamping force between the feed roller and the pressure roller, the medium is fed into the medium.
There is a problem that dirt on the pressure roller and the pressure roller may adhere.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a solution provided by the present invention is to sandwich a medium between a pair of rollers formed by one roller and the other roller. Transport
A guide member provided between each pair of rollers supports the medium being conveyed, and when removing the medium, the guide member rotates about the shaft of the one roller to support the conveyance path. In the medium transport mechanism that is opened, the medium that is moved in conjunction with the rotation of the guide member moves the medium sandwiched between the roller pairs.
Media release means for releasing from the pair of media.

According to the above construction, when the guide member rotates, the medium releasing means moves in conjunction with the movement, and releases the medium from the roller pair.

[0009]

Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals.

[0010] First Embodiment FIG. 1 of the first embodiment Russia - roller pair and O - perspective view of the Pungaido, Figure 2 is a first embodiment Russia - roller pair and O -
FIG. 3 is a side view showing the open guide, and FIG. 3 is an explanatory view showing the medium removing operation of the first embodiment.

In an apparatus such as a printing apparatus which needs to transport a medium, a transport path 2 for transporting the medium 1 is formed as shown in FIG. This transport path 2 is shown in FIG.
As shown in FIG. 2, the feeder 3 and feeder 3
And a plurality of roller pairs comprising a pressure roller 4 provided opposite to the roller 3 and a plurality of roller pairs provided between the roller pairs for guiding the medium 1 so as not to come off the transport path 2. And a guide. The guide includes a rotatable open guide 5 and a guide 6 whose position is fixed, and a guide 14 is provided opposite the open guide 5 and the guide 6.

The feed roller 3 is rotatably mounted on a shaft 7 fixed to a frame of a device (not shown), and the pressure roller 4 is mounted on a shaft 8. It is installed in a fixed state. As shown in FIG. 2, the shaft 8 is connected to a motor 10 via a belt 9, and when the motor 10 is driven, the shaft 8 rotates. The shaft 8 is provided on a frame of a device (not shown) so as to be movable in the directions of arrows CD.
One end of one is in contact with the bent state. The pressure roller 4 is pressed against the feed roller 3 by the urging force of the leaf spring 11. Incidentally, a roller pair composed of the feed roller 3 and the pressure roller 4, the open guide 5, the guide 6, and the guide 14 constitute a medium transport mechanism.

The open guide 5 is mounted on the shaft 7 so as to be rotatable about the shaft 7 in the direction of arrows AB, and is in a closed state when no force for rotating is applied, as shown in FIG. It is positioned at the position shown in FIG. A cam 5a is formed at one end of the open guide 5 (the side facing the shaft 8 when the open guide 5 rotates in the direction of arrow A from the closed state). The cam 5a moves in a direction approaching the shaft 8 as the open guide 5 rotates from the position shown in FIG. 2 in the direction of arrow A, and as shown in FIG. 3, when the open guide 5 is opened. The cam 5a moves the shaft 8 in the direction of arrow C against the urging force of the leaf spring 11, and separates the pressure roller 4 from the feed roller 3.

Next, the operation of transporting the medium and the operation of removing the medium 1 from the transport path 2 will be described with reference to FIGS.

At the time of transporting the medium, the motor 10 is driven in response to an instruction from a control unit (not shown), so that the pressure roller 4 rotates with the medium 1 sandwiched together with the feed roller 3. Then, the medium 1 is transported downstream in the transport direction.

When the medium 1 is removed from the transport path 2,
The operator rotates the open guide 5 in the direction of arrow A. When the open guide 5 is opened to the position shown in FIG.
The cam 5a of the open guide 5 moves the shaft 8 in the direction of arrow C against the urging force of the leaf spring 11, and separates the pressure roller 4 from the feed roller 3. Then, the holding state of the medium 1 by the feed roller 3 and the pressure roller 4 is released. The operator removes the medium 1 from the transport path 2 without applying any force.

On the other hand, when the operator turns the open guide 5 in the direction of arrow B in order to return the open guide 5 to the closed state, the cam 5a of the open guide 5 separates from the shaft 8 and the pressure The roller 4 moves in the direction of arrow D by the urging force of the leaf spring 11. Then, the pressure roller 4 is again pressed against the feed roller 3.

As described above, in the first embodiment, when the open guide is opened, the feed roller 3 is automatically turned on.
Since the state in which the pressure roller 4 is pressed is released, there is no need for the operator to apply force when removing the medium 1 from the transport path 2. Also, when removing the medium,
Since the medium 1 does not rub against the drawer 3 and the pressure roller 4, dirt of the feed roller 3 and the pressure roller 4 does not adhere to the medium 1.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 4 is a perspective view showing a roller pair and an open guide according to the second embodiment, FIG. 5 is a side view showing a roller pair and an open guide according to the second embodiment, and FIG. FIG. 14 is an explanatory diagram illustrating a medium removing operation according to the second embodiment.

4 and 5, an open guide 12 is shown.
Is rotatable about the shaft 7 in the direction of the arrow AB with the shaft 7 as a fulcrum, and is positioned at a position shown in FIGS. 4 and 5 in a closed state when no turning force is applied. I have.

A gear 12a is formed at one end of the open guide 12 (on the side facing the shaft 8 when the open guide 12 rotates in the direction of arrow A from the closed state). Shaft 8
, A gear 13 is fixedly engaged with the gear 12a when the open guide 12 rotates.

As the open guide 12 rotates from the position shown in FIG. 5 in the direction of arrow A, the gear 12a moves in a direction approaching the shaft 8, and meshes with the gear 13 as shown in FIG. Then, when further rotated, the gear 13 is rotated.

Next, the operation of transporting the medium and the operation of removing the medium 1 from the transport path 2 will be described with reference to FIGS.

When the medium is conveyed, the motor 10 is driven in response to an instruction from a control unit (not shown), so that the pressure roller 4 is held while holding the medium 1 together with the feed roller 3.
Rotates to transport the medium 1 to the downstream side in the transport direction. At this time, since the gear 12a does not face the gear 13, even if the pressure roller 4 rotates, the open guide 12 does not move.

To remove the jammed medium 1 from the transport path 2, the operator rotates the open guide 12 in the direction of arrow A. As the open guide 12 rotates in the direction of arrow A, the gear 12a moves in a direction approaching the shaft 8 and meshes with the gear 13 as shown in FIG. Further, when the operator rotates the open guide 12 in the direction of arrow A, the gear 13 meshing with the gear 12a rotates in the direction of arrow E, and the pressure roller 4 rotates in the direction of arrow E with the rotation. 1 is conveyed in the direction of arrow F, and the medium 1 is pushed out from the feed roller 3 and the pressure roller 4 as shown in FIG.

The operator removes the medium 1 from the transport path 2 without applying any force.

In the second embodiment, when the open guide is opened, the medium 1 is automatically pushed out of the feed roller 3 and the pressure roller 4 and becomes free. The operator does not need to apply force when removing the medium 1 from the transport path 2. When the medium is removed, the medium 1 is placed on the feed roller 3 and the pressure roller 4.
Is not rubbed, so that the dirt of the feed roller 3 and the pressure roller 4 does not adhere to the medium 1.

[0028]

Since the present invention is configured as described above, it has the following effects.

By providing a medium releasing means which moves in conjunction with the rotation of the guide member and releases the medium held between the pair of rollers from the pair of rollers, the guide member is rotated and the conveying path is formed. Upon release, the media is released from the roller pair. as a result,
The operator does not need to apply force when removing the medium from the transport path. Further, since the medium does not rub against the roller pair at the time of removal, dirt of the roller does not adhere to the medium.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a roller pair and an open guide according to a first embodiment.

FIG. 2 is a side view showing a roller pair and an open guide according to the first embodiment.

FIG. 3 is an explanatory diagram illustrating a medium removing operation according to the first embodiment.

FIG. 4 is a perspective view showing a roller pair and an open guide according to a second embodiment.

FIG. 5 is a side view showing a roller pair and an open guide according to a second embodiment.

FIG. 6 is an explanatory diagram illustrating a medium removing operation according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medium 3 Feed roller 4 Pressure roller 5 Open guide 5a Cam 12 Open guide 12a Gear 13 Gear

Claims (3)

[Claims] A medium is sandwiched and conveyed by a pair of rollers formed by one roller and the other roller, and a guide member provided between each pair of rollers is conveyed during the conveyance. In addition to supporting the medium, when the medium is removed, the guide member rotates about the axis of the one roller as a fulcrum, and in a medium transport mechanism that opens a transport path, interlocks with the rotation of the guide member. And a medium releasing means for releasing the medium held between the pair of rollers from the pair of rollers. 2. The medium release means is formed at one end of the guide member, and presses the shaft of the other roller in a direction away from one roller when the guide member rotates. 2. The medium transport mechanism according to claim 1, wherein the medium transport mechanism is a unit. 3. The other roller is fixedly mounted on a shaft. The medium releasing means includes a gear fixedly mounted on the shaft of the other roller, and one end of the guide member. 2. The medium transport mechanism according to claim 1, further comprising: a partial gear that is formed and meshes with the gear when the guide member rotates, and further rotates the gear when rotated.