JPH0657466B2 - Recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device such as a printer or a facsimile, and more particularly to a type in which a platen for backing up a recording medium is openably and closably mounted and the platen is opened to load the recording medium. Recording device.

[Conventional technology]

A guide member that guides a sheet-shaped recording medium to the main body of the recording device as a relatively small recording device including a case where the recording device (printer or the like) is incorporated into an electronic device such as a calculator with a printer or a word processor. A platen is rotatably supported so that a sheet feeding roller is provided on the main body and a pinch roller is provided at a position corresponding to the sheet feeding roller of the platen.

FIG. 1 exemplifies a printer (recording apparatus) equipped with this openable / closable platen.

In FIG. 1, the sheet feeding roller 3 is incorporated in the opening of the sheet guide portion 2 of the main body 1 in the approximate center portion.

A platen 5 is attached to the main body 1 via a platen support shaft 4.
Is rotatably supported. FIG. 1 shows a state in which the platen is opened, and moves (rotates) in the direction of arrow A in the figure.
By doing so, it is closed and set in a usable state.

A pinch roller 6 that is pressed against the sheet feed roller 3 at the closed position (set position) is mounted in the platen 5. The pinch roller is rotatably mounted via pinch roller shafts 7, both ends of which are supported by a platen 5.

On the other hand, the main body 1 has a recording head 9 movable in the width direction of a sheet (recording medium such as paper) 8, a type belt 10 driven in the width direction of the sheet 8 by a pair of pulleys, and ink on the type belt. An ink roll 11 to be supplied and a drive motor 12 are mounted. The drive motor includes a sheet feeding roller 3, a recording head 9 and a type belt 10.
It drives a recording unit such as.

A roll sheet is generally used as the sheet 8.

The sheet 8 is opened in the state shown in FIG. 1 by opening the platen 5, and the sheet 8 is inserted from the opening side of the platen 5 in the direction of arrow C to be loaded between the sheet guide portion 2 and the platen. , The platen 5 is closed, and the lock claw 13 is engaged with the engagement hole 14 on the main body 1 side.

FIG. 2 is a partial cross-sectional view showing a set state of the seat 8, and the same reference numerals as those in FIG. 1 indicate the same portions.

In FIG. 2, the pinch roller shaft 7 has hook portions 15, 15 formed inside the platen 5 at both ends thereof.
Is rotatably supported by.

In this sheet set state, the pinch roller shaft 7 is designed to bend as shown by the pressure contact force between the pinch roller 6 and the sheet feed roller 3, and the sheet 8 is placed between the pinch roller and the sheet feed roller. It is pinched.
Therefore, by driving the sheet feeding roller 3, the sheet 8 is fed by the frictional component of the clamping pressure.

When the platen 5 is closed, as shown in FIG. 2, the pinch roller shaft 7 bends due to the pressure contact force of the pinch roller 6, and the peripheral surface of the pinch roller substantially coincides with the surface of the platen 5. ing.

On the other hand, when the platen 5 is released, as shown in FIG. 3, the pinch roller 6 becomes free, so that the pinch roller shaft 7 becomes straight and the peripheral surface of the pinch roller projects from the surface of the platen 5. Become.

However, in the conventional recording apparatus of this type, the sheet 8
There was a case that it could not be loaded smoothly when loading.

FIG. 4 shows a state in which the conventional seat 8 is loaded, and the same reference numerals as those in FIGS. 1 to 3 denote the same parts.

In FIG. 4, the sheet 8 is loaded by opening the platen 5, holding the sheet front end portion 8A of the roll sheet 8 by hand, and inserting the sheet 8 in the direction of arrow C from the open end side.

However, when the platen 5 is open, the pinch roller 6 projects from the surface of the platen, and the peripheral edge of the end face is substantially right angle. Therefore, as shown in FIGS. 3 and 4, the side edge of the sheet 8 is pinched. The roller 6 often collides with or is caught on the peripheral edge of the end surface of the roller 6, and there is a problem that a smooth sheet cannot be loaded.

〔Purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus which can solve the problems of the prior art and can smoothly load a sheet in the platen open state.

[Means for achieving the purpose]

According to the present invention, a guide member is rotatably supported by a main body of a recording apparatus, a sheet feed roller is provided on the main body, and a pinch roller is provided at a position of the guide member corresponding to the sheet feed roller. In a recording device of a type in which the recording medium is opened and the recording medium is inserted from the open end side, and the guide member is closed to feed the recording medium by the sheet feeding roller, the pinch roller is provided on the open side of the guide member. The above object is achieved by forming the peripheral edge portion of the end face into a chamfered shape.

In the above configuration, it is preferable that the chamfered shape is provided at least in a range projecting from the platen surface of the pinch roller.

Further, it is preferable that the chamfering angle of the pinch roller is set to be larger than the opening angle of the platen so that the sheet can be easily overcome even if the sheet comes into contact with it.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

The present invention is applied to the platen opening / closing type recording apparatus as described above with reference to FIGS. 1 to 4, and the improvements will be described in detail below.

FIG. 5 shows the platen 5 of the recording apparatus according to the embodiment of the present invention.
And a cross section of the pinch roller 6 when opened, as shown in FIG.
The same reference numerals as those in FIG. 4 indicate corresponding parts.

In FIG. 5, a platen 5 as a guide member for guiding a sheet (recording medium) 8 is supported by a platen support shaft 4 so as to be openable and closable with respect to the main body 1 (FIG. 1) of the recording apparatus. The sheet feed roller 3 on the main body 1 side
A pinch roller 6 is rotatably mounted corresponding to (FIG. 2).

This pinch roller 6 is, as in the case of FIG. 2 and FIG. 3, a platen roller shaft 7 that is supported at both ends by hooking portions 15 and 15 and that is bent by the pressure contact force to the sheet feed roller 3 through the platen roller shaft 7. It is installed inside the 5.

FIG. 6 is a partially enlarged view of the pinch roller 6.

5 and 6, the peripheral surface 6A of the pinch roller 6 is configured to protrude to some extent from the surface 5A of the platen 5 when the platen is opened.

However, a chamfered shape 16 is formed on the end face peripheral portion of the pinch roller 6 on the platen 5 open end side, that is, on the opposite side of the platen support shaft 4 (left side in FIG. 5).

The depth H of the chamfered shape 16 is preferably selected to be equal to or more than the height T protruding from the platen surface 5A of the pinch roller 6.

That is, it is preferable to select the starting point A (FIG. 6) of the chamfered shape 16 to be the platen surface 5A or the inside thereof, and due to such shape, the side edge of the sheet 8 to be inserted comes into contact as shown in FIG. Even in this case, the sheet can be easily slid in the direction shown by the chain double-dashed line and can be smoothly loaded.

FIG. 7 is a partial plan view of the recording apparatus according to the present invention, showing the opening angle of the platen 5, that is, the rotation angle θ1 between the opening position of the platen 5 and the set position of the platen.

Note that, also in FIG. 7, the same reference numerals as those in FIGS. 1 to 6 denote corresponding portions.

On the other hand, in FIG. 6, the chamfered shape 1 of the pinch roller 6
The angle of 6 or the chamfer angle is θ2.

However, it is preferable that the chamfer angle θ2 is set to be larger than the opening angle θ1 of the platen.

The reason is that the chamfer angle θ2 is the platen opening angle θ1.
When the sheet is loaded from the same direction as the sheet insertion direction C by setting it to be larger, even if the sheet comes into contact with the end surface (chamfered shape 16) of the pinch roller 6, the sheet can easily slide along the inclined surface and the hooking This is because it can be loaded more smoothly without having to do so.

According to the embodiment described above with reference to FIGS. 5 to 7,
In the recording apparatus in which the platen 5 is rotatably supported and the pinch roller 6 is mounted in the platen, the peripheral edge portion of the pinch roller on the platen open end side has the chamfered shape 16, so that when the sheet 8 is loaded. The sheet can be prevented from being caught by the pinch roller 6, and the sheet can be loaded smoothly.

Further, since the chamfered shape 16 is provided over at least the range (protrusion height T) of the pinch roller 6 protruding from the platen surface 5A, and the chamfer angle θ2 of the pinch roller is set to be larger than the opening angle θ1 of the platen 5, the sheet The side edge of the sheet 8 is pinched by the pinch roller 6 during loading.
Even when it hits the end face of the sheet, the sheet can be slid along the chamfered shape without any trouble, and the sheet 8 can be loaded more smoothly.

FIG. 8 is a diagram showing a pinch roller used in a recording apparatus according to another embodiment of the present invention.

In the pinch roller 6 of this embodiment, the chamfered shape 16 provided on the peripheral edge portion of the end surface on the open end side of the platen 5 is formed by an arcuate slope.

The structure of the other parts is substantially the same as that of the embodiment described in FIGS. 5 to 7, and the corresponding parts are represented by the same reference numerals.

In the embodiment shown in FIG. 8, an arcuate chamfered shape 16
Is set to be larger than the protrusion amount T (when the platen is opened) of the pinch roller peripheral surface 6A from the platen surface 5A,
Moreover, the angle θ2 (chamfering angle) of the tangent line at the intersection B with the platen surface 5A is set to be larger than the opening angle θ1 of the platen 5 (FIG. 6).

As a result, similar to the case of the pinch roller 6 shown in FIG. 6, there is provided a recording apparatus capable of eliminating the catch at the time of loading the sheet 8 and smoothly loading the sheet.

In the illustrated embodiment, the chamfered shape 16 of the pinch roller 6 is provided only on the peripheral edge portion of one end surface, but this is the same even if it is provided on the peripheral edge portions of both end surfaces.

(Effect) As is apparent from the above description, according to the present invention, the main body of the recording apparatus is pivotally supported by the guide member so as to be openable and closable, the main body is provided with the sheet feed roller, and the guide member has the sheet feed roller. A recording apparatus of a type in which a pinch roller is provided at a corresponding position, the guide member is opened and a recording medium is inserted from the open end side, and the guide member is closed and the recording medium is fed by the sheet feeding roller. In the above, since the end surface peripheral portion of the pinch roller on the guide member open end side is chamfered,
Even if the side edge of the sheet comes into contact with the end surface of the pinch roller, the sheet can be guided in a direction away from the pinch roller,
Therefore, there is provided a recording apparatus capable of smooth sheet loading without sheet catching.

[Brief description of drawings]

FIG. 1 is a perspective view of a recording apparatus suitable for applying the present invention, FIG. 2 is a partial sectional view showing a platen and a pinch roller at a platen set of a conventional recording apparatus, and FIG. 3 is a conventional recording apparatus. 4 is a partial cross-sectional view showing the platen and the pinch roller when the platen is opened, FIG. 4 is a plan view illustrating the sheet loading of the conventional recording apparatus, and FIG. 5 is the platen opening of the recording apparatus according to one embodiment of the present invention. 6 is a partial sectional view showing the platen and the pinch roller of FIG. 6, FIG. 6 is an enlarged view showing the shape of the pinch roller of the recording apparatus according to the present invention, FIG. 7 is a partial plan view of the recording apparatus according to the present invention, and FIG. FIG. 6 is an enlarged view showing the shape of a pinch roller of a recording apparatus according to another embodiment. 1 ... Recording device main body, 3 ... Sheet feed roller, 4 ...
... Platen support shaft, 5 ... Platen, 5A ... Platen surface, 6 ... Pinch roller, 16 ... Chamfer shape, T ...
… Projection amount of pinch roller when the platen is opened, θ1 …… Platen opening angle, θ2 …… Pinch roller chamfering angle.

Claims (3)

[Claims] 1. A guide member is rotatably supported by a main body of a recording apparatus, a sheet feed roller is provided on the main body, and a pinch roller is provided at a position of the guide member corresponding to the sheet feed roller. A recording medium of a type in which the recording medium is opened and the recording medium is inserted from the open end side, and the guide member is closed to feed the recording medium by the sheet feeding roller. A recording apparatus, characterized in that a peripheral edge portion of the end surface is chamfered. 2. The recording apparatus according to claim 1, wherein the chamfered shape is provided in at least a range projecting from the guide member surface of the pinch roller. 3. The recording apparatus according to claim 1, wherein a chamfering angle of the pinch roller is larger than an opening angle of the guide member.