JPS6141714Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a recording paper feeding mechanism that transports recording paper or the like using a friction roller.

Conventionally, this type of device used in printers, etc. has a drive roller that drives the recording paper and an idler roller that presses the recording paper against this drive roller, and uses the friction between these rollers and the recording paper and sending the recording paper. However, in such an apparatus, the distance between the idler rollers is constant, and therefore, there is a drawback that only recording paper of a constant width can be used.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional apparatus and to realize a recording paper feeding mechanism with a simple configuration that can use recording paper of any width.

The recording paper feeding mechanism of the present invention attaches the idler roller so that it can move in the width direction of the recording paper, and uses a single spring to press and position the idler roller against the drive roller, allowing the idler roller to be moved by a simple operation. and positioning.

The recording paper feeding mechanism of the present invention will be explained below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the recording paper feeding mechanism of the present invention. In the figure, 1 is a drive roller, 2 is an idler roller, 3 is a profiled member, 4 is a recording pen, and 5 is a recording paper. The irregularly shaped material 3 is generally used as a chassis for printers, etc.
Here, it is also used as a guide part for the idler roller 2, and has a platen 31 and a holding part 32 for the idler roller 2. Drive roller 1 is platen 3
1, and the idler roller 2 is pressed against the drive roller 1 and attached to a support portion 32 of the profiled member 3 so as to be movable in the axial direction thereof. Further, the recording paper 5 is conveyed while being sandwiched between the drive roller 1 and the idler roller 2, and recording is performed by the recording pen 4.

The operation of the recording paper feeding mechanism of the present invention constructed as described above is as follows. Since the idler roller 2 is attached to the holding portion 32 of the profiled member 3 so as to be movable in its axial direction, it can be moved in accordance with the width of the recording paper 5 and fixed at an arbitrary position.

FIGS. 2 and 3 are configuration diagrams showing an embodiment of the cross-sectional shape of the profiled member 3 shown in FIG. 1 and a specific support mechanism for the idler roller 2. FIG. In the figure, the same parts as in FIG. 1 are designated by the same reference numerals. 33 is a guide plate, 34 is a supporting arm of the idler roller 2, 35 is a support lever for lifting and moving the idler roller 2, 36 is a spring, 37 is a guide pin, 38 is a positioning pin, and 39 is a positioning hole. Guide plate 3
3 and the support arm 34 constitute a support part for the idler roller 2. The support arm 34 is fixed to the guide plate 33, the idler roller 2 is attached to the tip of the support arm 34, and a support lever is installed above it. 35 is formed. Holding part 32
is a groove continuous in the depth direction, and this holding portion 32
A guide plate 33 is engaged with the guide plate 33 directly or via a guide pin 37. Further, a spring 36 is interposed between the guide plate 33 and the platen 31, and pushes the guide plate 33 downward. As is clear from the figure, if the diameter of the guide pin 37 is smaller than the width of the groove of the holding part 32, the guide plate 33 can rotate about the holding part 32 at the right end as a fulcrum, and the idler roller 2 supported by this can rotate. is driven by the force of the spring 36.
will be forced to. Further, a positioning pin 38 is provided on the bottom surface of the guide plate 33, and a positioning hole 39 that engages with the positioning pin 38 is also provided on the bottom surface of the profiled member 3 facing the guide plate 33. Therefore, the spring 36 pushes down the guide plate 33 and presses the idler roller 2 against the drive roller 1 with an appropriate force, and maintains the engagement between the positioning pin 38 and the positioning hole 39, thereby positioning the idler roller 2. He is working to do the following.

Now, if you pull up the support lever 35,
The idler roller 2 can be separated from the surface of the drive roller 1, and the guide plate 33
can also be deflected upward to disengage the positioning pin 38 and the positioning hole 39. Therefore, by moving the guide plate 33 while maintaining this state, the idler roller 2 can be moved to an arbitrary position. Note that after moving the idler roller 2 to the target position, the lifting operation by the support lever 35 is stopped, and the spring 3
If the guide plate 33 is moved from side to side with the guide plate 33 being pushed down by 6, the positioning pin 38 will engage with the positioning hole 39 provided in the vicinity, and positioning will be performed automatically. It will be done.

Here, since the surface of the drive roller 1 is generally formed to be rough in order to improve its friction efficiency, if the idler roller 2 is lifted off the surface of the drive roller 1 when the idler roller 2 is moved, the idler roller It is possible to prevent damage to the roller surface due to the movement of the roller.

Further, if one spring 36 is used to push down the idler roller 2 and hold it in position, by pulling up the support lever 35, the idler roller 2 can be lifted from the drive roller 1 and released from the position at the same time. The idler roller 2 can be moved and positioned with a simple operation.

In addition, in the above explanation, the guide plate 33
is engaged with the holding portion 32 via the guide pin 37, but the same operation can be performed even if a part of the guide plate 33 is folded back instead of the guide pin 37. Further, the positioning means provided between the deformed member 3 and the guide plate 33 includes a positioning pin 38 and a positioning hole 3.
9, but as long as the engagement is maintained by the force of the spring 36 and the engagement is released by pulling up the support lever 35, for example, a notched groove may be used. and a knife edge. Furthermore, the guide portion of the idler roller 2 is not limited to being made of the irregularly shaped material 3,
It may be a general shaft body.

As explained above, in the recording paper feeding mechanism of the present invention, the idler roller is mounted so as to be movable in its axial direction, and a single spring presses and positions the idler roller against the drive roller, making it easy to operate. Since the movement and positioning of the idler roller is performed by the above, it is possible to realize a recording paper feeding mechanism that can use recording paper of any width with a simple configuration.

[Brief explanation of drawings]

1 to 3 are block diagrams showing one embodiment of the recording paper feeding mechanism of the present invention. 1... Drive roller, 2... Idler roller, 3
...Unusual material, 4...Recording pen, 5...Recording paper, 3
DESCRIPTION OF SYMBOLS 1...Platen, 32...Holding part, 33...Guide plate, 34...Support arm, 35...Support lever, 36...Spring, 37...Guide pin,
38...Positioning pin, 39...Positioning hole.

Claims (1)

[Scope of utility model registration request] In a recording paper feeding mechanism that includes a drive roller for transporting recording paper and an idler roller that is rotated by being pressed against the drive roller, and that transports the recording paper by frictional force, a support part that supports the idler roller, and a support part that supports the idler roller, and a guide portion that holds the idler roller movably in the axial direction; a spring that is interposed between the support portion and the guide portion and presses the idler roller against the drive roller via the support portion; A recording paper feeding mechanism comprising: a positioning means provided between the guide portion and maintained in a positioned state by the force of the spring.