JPS6234912Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing structure for a presser roller support rod, and more particularly to an opening/closing structure for a presser roller support rod suitable as an upper document guide of a reading mechanism in a facsimile machine.

In the facsimile reading mechanism, it is necessary to clean the reading section of the upper document guide and the transmission document transport system rollers. FIG. 1 shows an example of the upper document guide of the reading mechanism of a conventional facsimile machine.

In FIG. 1, 1 is an upper document guide (presser roller support rod). The upper document guide 1 is swingable about a fulcrum 5 at one end, and a presser roller 2 is pivotally attached to the other end by a presser roller shaft 3. A spring fulcrum 9 is attached to the presser roller shaft 3.
A spring 4 is stretched between the presser roller 2 and
is pressed by the lower roller 6. When cleaning the reading section C and the lower roller 6, the upper document guide 1 is opened as shown by the dashed line in FIG. 1 and cleaned while being held in this state with one hand. In Figure 1, 7
8 is a lower document guide, and 8 is a paper discharge roller.

In the example shown in FIG. 1, when the upper document guide 1 is opened to a certain angle, the spring 4 comes into contact with the shaft of the lower roller 6. The angle cannot be increased. Further, the position A of the presser roller shaft 3 when the upper document guide 1 is in the closed state and the shaft 3 when the upper document guide 1 is in the open state are shown.
Since the distance from position B increases in proportion to the opening angle of the upper document guide 1, in order to keep the stress at the maximum length of the spring 4 within the allowable stress value,
As the maximum opening angle of the upper document guide 1 is increased, the overall length of the spring 4 must be increased and the stiffness of the spring must be decreased. Therefore, the opening angle of the upper document guide 1 is limited due to restrictions on the mounting of the spring fulcrum 9.

In addition, since the spring 4 extends approximately in proportion to the opening angle of the upper document guide 1, in order to hold the upper document guide 1 in the open state during cleaning, a force approximately equal to the reaction force when the spring 4 is fully extended is required. must continue to be added to the upper document guide 1.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, eliminate the limitation on the maximum opening angle, and enable automatic holding at the opening angle of the presser roller support rod of the upper document guide in the reading mechanism section of the facsimile machine. Provides an opening and closing structure.

In the opening/closing structure of the presser roller support rod according to the present invention, the presser roller, which is pressed by a spring force against a mating roller and which pinches and transports a piece of paper together with the roller, is pivoted at one end and can swing using the other end as a fulcrum. An opening/closing structure in which a presser roller support rod is rotated and returned in a direction in which the presser roller is separated from a mating roller,
A presser plate is provided for pressing the presser roller shaft in a direction in which the presser roller is pressed against the mating roller, and the presser plate is opposite to the fulcrum of the presser roller support rod with respect to a line connecting the axes of the presser roller and the mating roller. It has a fulcrum on the side, is swingable around the fulcrum, and is biased by a spring in the direction of pressing the presser roller shaft between the fulcrum and the contact point of the presser roller shaft. The feature is the opening/closing structure of the presser roller support rod.

In a preferred embodiment of the opening/closing structure of the presser roller support rod according to the present invention, the presser plate has a recess into which the presser roller shaft can fit, on the sliding side of the presser roller shaft at the end opposite to the fulcrum. The presser roller shaft is fitted into the recess so that the presser roller support rod can be held in an open state.

In another preferred embodiment of the opening/closing structure of the presser roller support rod according to the present invention, the presser plate swings the presser roller support rod against the pressing force, and the presser plate slides on the presser roller shaft. A claw part is provided at the extended tip to stop the sliding of the presser plate until the line connecting the presser roller and the presser roller supporting rod fulcrum forms an angle of 90 degrees or less with the presser plate. The presser roller support rod can be held at a large open angle at the claw portion.

The opening/closing structure of the presser roller support rod according to the present invention is suitable for using the presser roller support rod as an upper document guide of a reading mechanism in a facsimile machine.

Hereinafter, the opening/closing structure of the presser roller support rod of the present invention will be explained based on the drawings of the embodiments. FIG. 2 is a side view of the reading mechanism in the facsimile according to the embodiment of the present invention. In this device, an upper document guide 1, a presser roller 2, a presser roller shaft 3, an upper document guide fulcrum 5, a lower roller (mate roller) 6, a lower document guide 7, a paper ejection roller 8, a spring fulcrum 9
has exactly the same function as the parts with the same reference numerals in the conventional device shown in FIG.

This device is provided with a presser plate 10 that presses the presser roller shaft 3 in a direction that presses the presser roller 2 against the lower roller 6. The presser plate 10 has a fulcrum 11 on the opposite side of the upper document guide fulcrum 5 with respect to the line connecting the axes of the presser roller 2 and the lower roller 6, and the presser plate 10 is swingable about the fulcrum 11. be. Further, the presser plate 10 is biased in a direction to press the presser roller shaft 3 by a spring 4A between the fulcrum 11 and the contact point with the presser roller shaft 3.

A presser roller shaft 3 is attached to the sliding side (F side) of the presser roller shaft 3 at the end opposite to the fulcrum 11 of the presser plate 10.
A recess D is provided in which the can be fitted. When the upper document guide 1 is swung around the upper document guide fulcrum 5 and gradually opened, the presser roller shaft 3 is
Push up the presser plate while sliding on the underside (section F) of the presser plate. When the presser roller shaft 3 is fitted into the recess D, the upper document guide 1 is held in the closed position by the presser plate 10 as shown by the dashed line.

FIG. 3 shows another embodiment. When the upper document guide 1 swings about the fulcrum 5 against the pressing force, the presser plate 10 slides on the presser roller shaft 3 and is pushed up. Presser roller 2 and upper document guide fulcrum 5
The angle that the line connecting the lines makes with the presser plate 10 becomes successively smaller than the obtuse angle. When the length of the presser plate 10 is made sufficiently long, this angle exceeds 90 degrees and becomes an acute angle. In the embodiment shown in FIG. 3, the presser plate 10 is made sufficiently long as described above, and the claw portion G is provided at the extended end thereof.

When the upper document guide 1 is swung and the line connecting its fulcrum 5 and the center of the presser roller 2, that is, the presser roller shaft 3, makes an angle of 90 degrees with the presser plate 10, the presser plate 10
A contact point E between the presser roller shaft 3 and the presser roller shaft 3 is located on the line. This state is shown in FIG. 3 by a dashed line.
In this case, the force that the presser roller shaft 3 receives from the presser plate 10 is directed toward the upper document guide fulcrum 5, so the upper document guide 1 can remain stationary in this state. When the upper document guide 1 is opened to an angle exceeding this point, the force applied from the presser plate 10 to the presser roller shaft 3 is in the direction of further opening the upper document guide 1. Therefore, if the claw part G is provided at such a position, the presser roller shaft 3 of the upper document guide 1 will be engaged with the claw part G, and the upper document guide 1 will be held in the open state. This state is shown in FIG. 3 by a two-dot chain line.

Since the opening/closing structure of the upper document guide of the present invention is as described above, it is possible to eliminate the limitation on the maximum opening angle of the upper document guide due to the limitation in mounting the spring, which was present in the conventional structure. That is, when the upper document guide is opened, the spring 4A moves away from the lower roller shaft, and when the opening is increased, it returns to its original position. It is practically impossible to make the spring 4A that large.), the spring 4A never comes into contact with the lower roller shaft. Also, open the upper document guide 1 and move the presser roller shaft from A to B.
(See FIGS. 2 and 3), the locking point of the spring 4A of the presser plate 10 moves to the locking point at the position of the presser plate 10 shown by the dashed line in FIG. After that, it returns to its original position. As described above, the moving distance of the locking point of the spring 4A is small, and therefore the amount of extension of the spring 4A is small, so there are very few restrictions on the characteristics and mounting of the spring 4A.

In addition, by opening the upper document guide 1 and fitting the presser roller shaft 3 into the recess D or engaging with the claw G, the upper document guide 1 is held in the open state and cannot be held by hand or by using an auxiliary tool. There's no need.
When the upper document guide 1 is opened to an angle greater than the position indicated by the dashed-dotted line in FIG. 3, the claw portion G is sufficient as the locking means for the presser roller shaft 3 instead of the recess D.

Furthermore, in the conventional device, when opening the upper document guide 1, the required force increases almost in proportion to the opening angle, but in the device of the present invention, the amount of expansion of the spring 4 is small, and moreover, the force increases in proportion to the opening angle. (Figure 3 1
Since no force is required to open the upper document guide 1 from the position indicated by the dotted chain line), less force is required to open the upper document guide 1.

As described above, the upper document guide of the present invention has a large opening angle during cleaning and can be automatically held in the open state, so it is extremely effective when incorporated into a facsimile machine. Further, the structure of the presser roller support rod of the present invention is not limited to the upper document guide of the reading mechanism in a facsimile machine, and it goes without saying that an opening/closing structure of the presser roller support rod similar to this is also effective.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of a reading mechanism in a conventional facsimile, and FIGS. 2 and 3 are side views of different embodiments of the reading mechanism of a facsimile equipped with an upper document guide of the present invention. 1... Upper document guide, 2... Presser roller, 3
... Presser roller shaft, 4, 4A ... Spring, 5
...Upper document guide fulcrum, 6...Lower roller, 1
0... Pressing plate, 11... Holding plate fulcrum, D... Recess, G... Claw portion.

Claims (1)

[Claims for Utility Model Registration] 1. A presser roller support that is pivoted at one end of the presser roller that is pressed by a spring force against a mating roller and that pinches and transfers the paper together with the roller, and that is swingable about the other end as a fulcrum. In the opening/closing structure in which the rod is rotated and returned in a direction in which the presser roller is separated from the mating roller, a presser plate is provided that presses the presser roller shaft in a direction that presses the presser roller against the mating roller, and the presser plate is configured to It has a fulcrum on the opposite side of the fulcrum of the presser roller support rod with respect to the line connecting the axes of the presser roller and the mating roller, is able to swing around the fulcrum, and has a contact point between the fulcrum and the presser roller shaft. The presser plate is biased in the direction of pressing the presser roller shaft by a spring between the presser plate and the presser roller shaft on the sliding side of the presser roller shaft at the end opposite to the fulcrum. 1. An opening/closing structure for a presser roller support rod, characterized in that the locking portion locks the presser roller support rod with the locking portion, and the presser roller support rod can be held in an open state by locking the presser roller with the locking portion. 2. The presser plate is provided with a claw portion on the sliding side of the presser roller shaft at its tip portion for locking the presser plate and the presser roller to each other, and the presser roller support rod is held in an open state at the portion of the claw portion. The opening/closing structure of the presser roller support rod according to claim 1 of the utility model registration, which is capable of being held by the user. 3. The opening/closing structure of the presser roller support rod according to claim 1 or 2, wherein the presser roller support rod is an upper document guide of a reading mechanism in a facsimile machine.