JPH066118Y2 - Medium return mechanism of medium feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a medium returning mechanism of a medium feeding device in a printer, a magnetic reading / writing device, or the like. The present invention relates to a medium returning mechanism of a medium feeding device that cooperates to feed each sheet separately.

[Conventional technology]

FIG. 5 is a side sectional view showing a conventional medium feeding device. In FIG. 5, 1 is a medium cassette mounted in a mounting portion of the medium feeding device, and 2 is vertically movable provided in the medium cassette 1. The stage 3 is a standard medium placed on the stage 2 and housed in the medium cassette 1.

Reference numeral 4 is an upper guide plate, 5 is a lower guide plate, and both guide plates 4 and 5 are members that form a feeding path for the medium 3, and are arranged so as to extend in a horizontal direction from above the mounting portion at a constant interval. It is provided.

6 is a pickup roller, and this pickup roller 6
Is arranged above the medium 3 housed in the medium cassette 1 and a part of the outer periphery thereof projects downward from a through hole or slit provided in the upper guide plate 4.

Reference numeral 7 is a feed roller, and 8 is a reverse roller paired with the feed roller 7. The frictional force of the reverse roller 8 with respect to the medium is smaller than that of the feed roller 7 and larger than the frictional force between the media 3. ing.

Here, the feed roller 7 is arranged on the upper guide plate 4 side at a constant distance from the medium feeding port of the medium cassette 1, and the reverse roller 8 is also set at a constant distance from the medium feeding port of the medium cassette 1. And is disposed on the lower guide plate 5 side, and both are in contact with each other between the two guide plates 4 and 5.

A medium detection sensor 9 is provided near the feed roller 8 and the reverse roller 9.

In this structure, the feeding of the medium 3 is performed as follows.

First, in a state in which the medium cassette 1 is mounted on the mounting portion of the medium feeding device, the stage 2 is lifted by a motor and a driving force transmission mechanism (not shown), so that the uppermost medium 3 in the medium cassette 1 is picked up by a pickup roller. When it comes into contact with 6, the state is detected by a sensor (not shown),
Stage 2 is stopped.

Then, the pickup roller 6 rotates counterclockwise as shown by the arrow by a motor and a driving force transmission mechanism (not shown), and the feed roller 7 rotates in the same direction as the pickup roller 6 or at a predetermined time difference. .

When the pickup roller 6 rotates, the medium 3 in contact with the pickup roller 6 is sent to the feed roller 7 side, and when the tip of the medium 3 reaches between the feed roller 7 and the reverse roller 8, the medium 3 The leading end is nipped by the feed roller 7 and the reverse roller 8, and the medium 3
Is sent by rotation of the pickup roller 6 and the feed roller 7.

When the tip of the medium 3 is detected by the sensor 9, the rotation of the pickup roller 6 is stopped and the reverse roller 8 is rotated based on the detection.

The rotation direction of the reverse roller 8 is the same counterclockwise direction as the feed roller 7 as shown by the arrow, but at the contact portion with the feed roller 7, the rotation is in the opposite direction. A force for pushing back to the medium cassette 1 side is added against the feeding force.

However, since the frictional force of the reverse roller 8 with respect to the medium 3 is smaller than that of the feed roller 6 as described above, when the number of the medium 3 is only one, the reverse roller 8 slips with respect to the medium 3, which causes the medium. 3 is sent by the rotation of the feed roller 6 as it is, and can pass between the feed roller 6 and the reverse roller 8.

By the way, the medium 3 sent out from the medium cassette 1 by the pickup roller 6 is not limited to the topmost one which is in contact with the pickup roller 6, but due to various factors, the media 3 are brought into close contact with each other and a plurality of sheets are simultaneously sent out. There are cases.

In this case, since the frictional force between the reverse roller 8 and the medium 3 is larger than the frictional force between the mediums 3, the mediums 3 other than the uppermost one among the media 3 fed out at the same time, that is, the second medium and below. 3 is a reverse roller 8 for a medium cassette 1
Pushed back to the side.

In this way, the medium 3 is fed, and the medium 3 passing between the feed roller 7 and the reverse roller 8 is fed along the upper guide plate 4 and the lower guide plate 5 (not shown). The roller and the pressure roller convey the medium to a medium processing unit such as a printing unit or a magnetic reading / writing unit. When the rear end of the medium 3 is detected by the sensor 9, the feed roller 7 and the reverse roller 8 are detected. The rotation is stopped.

When the required number of media 3 are fed from the media cassette 1 by the above operation, the stage 2 descends and returns to the initial state.

[Problems to be solved by the invention]

However, the above-mentioned conventional technique has the following problems.

That is, when the final medium is fed out during medium feeding, if there is a medium pushed back to the medium cassette side by the reverse roller, the medium does not return to the medium cassette normally even if the stage is lowered, 5 medium 3a
As described above, there may be a state in which the tip remains on the end of the lower guide plate and is inclined, that is, there is a medium protruding from the medium cassette.

In this case, the medium cassette, that is, the medium cassette currently mounted on the medium feeding device, is perpendicular to the medium feeding direction in order to replenish the medium or to exchange the medium cassette containing a medium having a different size. When pulled out to the front side in the direction, the protruding medium 3a is caught between the medium cassette and the mounting portion and causes a jam, which not only takes time to remove but also causes the medium to be magnetically read / written. In the case of an expensive medium with a magnetic stripe used in a device or the like, there is a problem that the expensive medium is wasted.

The present invention has been made to solve such a problem, and when pulling out the medium cassette from the medium feeding device, even if there is a medium protruding from the medium cassette, the medium can be securely structured with a simple structure. Another object of the present invention is to realize a medium returning mechanism of a medium feeding device that can be pushed back into a medium cassette.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a mounting portion in which a medium cassette accommodating a standard medium is detachable in a direction orthogonal to the medium feeding direction, and a medium cassette disposed above the mounting portion and from the medium cassette. A pickup roller for feeding the medium, a feed roller for feeding the medium in the same direction as the medium feeding direction by the pickup roller, and a feed roller arranged in contact with the feed roller and feeding a plurality of mediums by the pickup roller. In a medium feeding device provided with a reverse roller that rotates so as to push back the medium after the first sheet to the medium cassette side, a rotatable return lever biased by a spring is provided in the back of the mounting portion. .

[Action]

According to the present invention having the above-mentioned configuration, when the medium cassette is mounted on the mounting portion of the medium feeding device, the return lever is pushed by the medium cassette, whereby the return lever rotates against the biasing force of the spring.

After the medium feeding is completed, when the medium cassette is pulled out from the mounting portion, the restoring lever of the spring accordingly causes the return lever to rotate in the direction opposite to the mounting direction.

At this time, even if there is a medium which is fed back by the reverse roller and protrudes from the medium cassette at the time of feeding the medium, the medium is reliably pushed back into the medium cassette by the return lever.

As described above, according to the present invention, the medium can be reliably returned into the medium cassette with a simple structure using only the return lever and the spring.

Therefore, according to this, it is possible to prevent the occurrence of jamming due to the medium protruding from the medium cassette as in the conventional case, it is possible to eliminate the trouble of removing the jammed medium, and the expensive medium with a magnetic stripe. Is not wasted.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a diagram showing a structure of an embodiment of a medium returning mechanism of a medium feeding device according to the present invention. FIG. 1 (I) is a plan view, FIG. 1 (II) is a side sectional view, and FIG. The drawing is a perspective view of the return lever in the embodiment of FIG.

In FIG. 1, 1 is a medium cassette, 2 is a stage, 3 is a medium, 4 is an upper guide plate, 5 is a lower guide plate, 6 is a pickup roller, 7 is a feed roller, 8 is a reverse roller, and 9 is a sensor. Are the same parts as those in FIG. 1 and have the same structure.

Reference numeral 10 is a support portion provided on the abutting surface at the back of the mounting portion in which the medium cassette 1 is mounted, 11 is a return lever,
This return lever 11 has one end 1 as shown in FIG.
1a and the other end 11b are bent in mutually opposite directions, and a cassette receiving roller 11c is rotatably supported by a tongue portion formed in the vicinity of the one end 11a side so as to project in the same direction. Has a structure in which mounting portions 11d projecting in the same direction are formed in the vicinity of the end portion 11b of the medium so as to face each other in the vertical direction, and one end portion 11a has the one end portion 11a.
A mounting portion 11d is rotatably supported by the supporting portion 10 via a shaft 12 so as to be on the side.

Reference numeral 13 denotes a torsion spring mounted on the shaft 12, and the torsion spring 13 biases the return lever 11 so that one end 11a thereof is rotated toward the medium cassette 1 side.
When the medium cassette 1 is not mounted in the mounting portion of the medium feeding device, the other end portion 11b comes into contact with the abutting surface so that one end portion 11a of the medium cassette 11 is inserted into the mounting portion. It is designed to be kept substantially parallel to the surface on the medium feeding opening side.

FIG. 3 is an explanatory view showing the operation of the embodiment of FIG. 1, FIG. 4 is a view showing a state in which the medium cassette is being pulled out, FIG. 3 (I) is a plan view, and FIG. It is a figure, and an operation | movement is demonstrated using FIG. 1 with these FIG. 3 and FIG.

First, the medium cassette 1 containing the medium 3 is shown in FIG.
As shown in FIG. 5, when the medium is inserted into the mounting portion of the medium feeding device from the direction of arrow A, the vicinity of the corner of the front end surface of the medium cassette 1 in the insertion direction hits the cassette receiving roller 11c of the return lever 11 at a predetermined position. .

Then, when the medium cassette 1 is further inserted, the cassette receiving roller 11c is pushed accordingly, so that the return lever 11 rotates about the shaft 12 against the biasing force of the torsion spring 13.

Then, when the medium cassette 1 is completely inserted into the mounting portion, one end 11a of the return lever 11 retracts to a position where it does not hinder the feeding of the medium 3 from the medium cassette 1 and at the same time the other end 11b. Comes into contact with the front end surface of the medium cassette 1 to prevent further insertion, and the medium cassette 1 is fixed by a locking means such as a latch not shown.

In this state, the medium 3 in the medium cassette 1 is fed by the cooperation of the pickup roller 6, the feed roller 7, and the reverse roller 8.

Since the operation at this time is the same as the conventional one, the description thereof will be omitted here, but when the final medium is sent out from the medium cassette 1 at the time of feeding the medium, the reverse roller 8 pushes it back to the medium cassette 1 side. When the medium 3 is present, the medium 3 does not return to the inside of the medium cassette 1 normally even if the stage is lowered, and the tip of the medium 3a is a lower guide like the medium 3a shown in FIGS. 1 (I) and (II). The plate 5 may remain on the end portion of the plate 5 and may be obliquely inclined, that is, may protrude from the medium cassette 1.

Therefore, after the feeding of the medium 3 is completed, in order to replenish the medium 3 or to replace it with a medium cassette containing a medium of a different size, the locking means is released and the medium cassette 1 is set in the medium feeding direction. When the return lever 11 is pulled out in the front direction of the orthogonal direction, that is, in the direction of the arrow B, the return lever 11 accordingly rotates in the opposite direction by the restoring force of the torsion spring 13.

As a result, one end 11a of the return lever 11 pushes the vicinity of the corner of the tip of the medium 3a from an oblique direction as shown by an arrow F in FIG. 3, whereby the medium 3a is moved to the state shown in FIGS. As shown in FIG. 4), the medium cassette 1 drops from the lower guide plate 5 and surely returns to the inside of the medium cassette 1. Therefore, if the medium cassette 1 is further pulled out in the direction of the arrow B, the medium cassette 1 is fed without jamming. It can be removed from the mounting part of the feeding device.

Although the torsion spring 13 is used as the biasing means of the return lever 11 in the above-described embodiment, a coil spring can be used if the mounting position is taken into consideration.

[Effect of device]

As described above, according to the present invention, by providing a rotatable return lever biased by a spring inside the mounting portion of the medium feeding device, when the medium cassette is mounted on the mounting portion, the spring is attached. When the return lever is rotated against the force and the media cassette is pulled out from the loading section,
The restoring force of the spring causes the return lever to rotate in the opposite direction to that when it is attached, so that the medium protruding from the medium cassette is surely pushed back into the medium cassette. Therefore, a simple structure using only the return lever and the spring There is an effect that the medium can be reliably returned to the medium cassette,
As a result, it is possible to prevent the occurrence of a jam due to the medium protruding from the medium cassette as in the conventional case, and it is possible to eliminate the trouble of removing the jammed medium and to waste the expensive medium with the magnetic stripe. It is possible to obtain the effect of disappearing.

Also, the present invention has a simple structure and a small number of parts,
There is also the effect that the degree of freedom in design is high and that the number of installation steps is small.

[Brief description of drawings]

FIG. 1 is a view showing the structure of an embodiment of a medium returning mechanism of a medium feeding device according to the present invention, FIG. 2 is a perspective view of a returning lever in the embodiment of FIG. 1, and FIG. 3 is a drawing of FIG. FIG. 4 is an explanatory view showing the operation of the embodiment, FIG. 4 is a view showing a state in which the medium cassette is being pulled out, and FIG. 5 is a side sectional view showing a conventional medium feeding device. 1: Medium cassette 2: Stage 3: Medium 6: Pickup roller 7: Feed roller 8: Reverse roller 11: Return lever 11 11a: One end 11b: The other end 11c: Cassette receiving roller 12: Shaft 13: Twist Torsion spring

Claims (1)

[Scope of utility model registration request] 1. A mounting portion in which a medium cassette accommodating a standard medium can be attached and detached in a direction orthogonal to the medium feeding direction,
A pickup roller which is arranged above the mounting portion and which feeds out the medium from the medium cassette, a feed roller which feeds the medium in the same direction as the medium feeding direction by the pickup roller, and which is arranged in contact with the feed roller, In a medium feeding device including a reverse roller that rotates so as to push back the second and subsequent mediums to the medium cassette side when a plurality of mediums are fed by a pickup roller, a spring is biased in the back of the mounting portion. A rotatable return lever is provided so that the return lever rotates against the urging force of the spring when the medium cassette is mounted in the mounting portion, and when the medium cassette is pulled out from the mounting portion, Due to the restoring force, the return lever rotates in the opposite direction to the mounting direction and the media protruding from the media cassette is put in the media cassette. A medium returning mechanism for a medium feeding device, characterized in that it is pushed back.