JPH0398927A - Paper feeding device - Google Patents

Abstract

PURPOSE:To arrange paper feeding rollers in an ideal position for any size of sheet by providing a prescribed sheet housing means with a guide member by which, in interlock with the fitting action, slidable paper feeding rollers are shifted to a position where the paper feeding rollers do not act on transfer papers stored in the prescribed sheet-housing means. CONSTITUTION:A cassette 1 is fitted in a paper feeding device from the direction of the arrow A. Before the cassette 1 is fitted, a paper feeding roller 6e, pushed by a coil spring 14 (not shown) and lockedly engaged by a pin 14 (not shown), is in the position 6c shown by a double-chain line. Accordingly, at the beginning the cassette 1 is fitted, the rear end part 18a (not shown) of a rail is engaged with the recessed part 19 (not shown) of a paper feeding roller 6e. In this condition, if the cassette 1 is further moved to be fitted, in interlock with the fitting action, the paper feeding roller 6e moves towards the direction of the arrow B along a rail part 18 (not shown), and occupies a nonoperational position shown by a continuous line. Thus, the transfer paper sheets of size A are fed by the paper feeding rollers 6a and 6b, and the right and left distances from the ends of paper to the ends of the respective rollers become equal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Santo] The present invention relates to a paper feeding device that is used in electronic copying devices, printers, etc. and is equipped with a removable sheet storage means.

[Prior Art] Conventionally, such a paper feeding device is configured as shown in FIGS. 2 and 3. That is, transfer paper 3 as a sheet is placed on an intermediate plate 2 that slides horizontally and is swingably supported by a cassette l serving as a removable sheet storage means.
is loaded and is pressurized upward by a coil spring 4. At both corners of the leading edge of the transfer paper 3 in the paper feeding direction,
A separation claw 5 is swingably supported. A plurality of paper feed rollers 6 are arranged on the paper feed roller shaft 7 as shown in FIG. The paper feed roller 6 rotates in the direction of the arrow by a drive system (not shown) and feeds the uppermost sheet of the transfer paper 3.

At this time, the leading edge of the transfer paper 3 is restrained by the separating claw 5, and the transfer paper 3 buckles as shown in FIG.
After that, the tip will come off the separation claw, and it will separate.
It comes off from the separation claw 5.

Therefore, the distance from the leading edge of the paper to the paper feed roller 6. and,
The distance glfL2 from the paper end to the paper feed roller 6 is an important factor for paper feeding performance such as double feeding and skew feeding. In particular, if there is a difference in viewing between the left and right sides, there will be a difference in the ease with which the transfer paper 3 comes off from the separating claw 5, causing skew feeding. Therefore, it is common practice to arrange the paper feed roller 6 at a position corresponding to various paper sizes, but this may not be possible due to the difference or small size of the transfer paper. The transfer paper 8 shown by the solid line in Fig. 3 is A4 size (210cm amount x 2
The transfer paper 9 shown by the two-dot chain line is letter size (215.9×279.4tge).
It is. The paper feed rollers 6 corresponding to the transfer paper 8 are paper feed rollers 6a and 6b, and the distances from the paper edge to the paper feed rollers 6 are the same on both the left and right sides. On the other hand, for the transfer paper 9,
If you try to arrange the paper feed roller 6 symmetrically, it should be at the position 6C shown by the two-dot chain line, but at this position,
There is a width regulating plate lO that regulates the posture of the transfer paper 8 in the paper width direction, and it interferes with the width regulating plate lO, so the position is different from this (6d).
It had no choice but to be placed in At this time, the distance from the paper edge to the paper feed roller was 3, which was apparently shorter. [Problem to be solved by the invention] However, in the above conventional example, the distance from the paper edge to the paper feed roller is 3 on the right and 3 on the left in the paper conveyance direction, and the distance on the right is shorter. , because it is difficult to buckle when feeding paper, it is slow to come out of the separation claw and tends to run skewed. [Means for solving the problems] The present invention has been made to solve the above problems, and has the following features:
To provide a paper feeding device which can arrange a paper feeding roller at an ideal position for any size sheet and can prevent sheets from being skewed.

According to the present invention, at least one paper feed roller is configured to be slidable in the axial direction, and when a predetermined sheet storage means is mounted, the slideable paper feed roller By providing the predetermined sheet storage means with a guide member that moves the sheet to a position where it does not act on the sheet, the paper feed roller can be placed at an ideal position for any paper size, and there is no skew. A paper feeding device can be realized.

[Embodiment] FIG. 1 is a drawing that best represents the features of an embodiment of the present invention, and l represents a cassette as a sheet storage means.

Reference numeral 7 denotes a paper feed shaft provided with a plurality of paper feed rollers 6, and among the paper feed rollers 6, the paper feed roller 6e is arranged as shown in FIG. The paper feed roller 6e is composed of a roller portion l1 made of rubber and a collar 12 made of plastic. A flange portion 12a is formed on the collar 12, a compression coil spring l4 is provided between the flange portion 12a and a washer l3 fixed to the paper feed shaft 7, and the paper feed roller 6e is attached to the right in the figure. Forced. 15 is a bottle 15 that passes through the paper feed shaft 7, and a pin W provided on the collar 12
It12b engages with the paper feed roller 6e to control the rotation of the paper feed shaft 7.
It is intended to be communicated to the public.

Since the paper feed roller 6e is configured in this manner, it can move in the direction of the arrow in the figure against the biasing force of the compression coil spring l4. On the other hand, as shown in FIG. 1, the cassette is provided with a width regulating plate 16. The width regulating plate 16 is composed of a width regulating portion l7 that regulates the posture of the transfer paper 8 as a sheet in the width direction, and a rail portion l8. The rail portion 18 engages with a recess 19 of the paper feed roller 6e in FIG. 4, and slides the paper feed roller 6e in the axial direction.

The cassette 1 is loaded into the paper feeder in the eight directions shown by the arrows in FIG. Before the cassette l is installed, the paper feed roller 6e is pushed by the coil spring l4 and is at the position 6C shown by the two-dot chain line, where it is locked by the bin l4, and therefore the cassette l
When the rail rear end 18a is first installed, the paper feed roller 6
It engages with the recess l9 of e. The I-Ill plane is shown in FIG. When the cassette l is further mounted in this state, the paper feed roller 6e moves along the rail portion l8 in the direction of arrow B in FIG. 1 in conjunction with the mounting operation, and occupies the position shown by the solid line.

Fig. 6 shows a cross-section of 1-1 in this state.

A roller 20 is rotatably provided on the rail front end 18b of the rail portion l8 by a rotating pin 2l, and when the loading of the cassette l is completed, the recess l9 of the paper feed roller 6e comes into contact with the end surface of the roller 20. It looks like this. For this reason, the sixth
In the state shown in the figure, even if the paper feed operation is performed and the paper feed roller 6e rotates, the fourth part 19 prevents unnecessary sliding of the recess 19 by causing the roller 20 to follow.

With the above configuration, vIM.
If the transferred transfer paper 8 is A4 size, the paper feed roller 6
Since the paper is fed by rollers a and 6b, the paper feed roller 6
If the distance from the left to right is the same, and if the transfer paper 9 is letter size, as shown by the two-dot chain line in Figure 1, then the cassette L without a rail section will be installed, so the paper feed will be Since the roller 6e is at the position shown by the two-dot chain line 6C, the distance a from the paper edge to the paper feed roller 6 can be set equally on the left and right sides, so there is no time difference in the timing when the transfer paper leaves the separating claw, and the paper feed Skewing of paper can be prevented.

[Other Embodiments] In the first embodiment, the width regulating portion l7 and the rail portion 18
Although an example has been shown in which these are integrally formed, the present invention is not limited to this, and may be constructed using separate members.

Furthermore, the rail portion l8 may be molded or formed integrally with the casing 22 of the cassette l as shown in FIG. The performance is improved, the operation becomes smoother,
In addition, it is possible to reduce costs by making all the products in one form. [
Effects of the Invention] The paper feed roller can be placed at an ideal position for sheets of any size, and skew can be prevented.

[Brief explanation of drawings]

Fig. 1 is a plan view of a paper feeding device embodying the present invention, Fig. 2 is a sectional view showing a conventional example, Fig. 3 is a plan view showing a conventional example, and Fig. 4 is a paper feed roller embodying the present invention. 5 is a sectional view taken along line II in FIG. 1, FIG. 6 is a sectional view taken along line nn in FIG. 1, and FIG. 7 is a sectional view showing another embodiment. 1 is the cassette 5 is the separation claws 6a to 6e is the paper feed roller 7 is the paper feed shaft 8 is the transfer paper (A4) 9 is the transfer paper (letter) 11 is the roller part l2 is the collar l3 is the washer l4 is the compression spring 15 is the pin 16, a width regulating plate 17, a width regulating portion 18, a rail portion 19, a recess 20, a roller 21, a rotating pin 22, and a casing.

Claims (3)

[Claims] (1) In a paper feeding device that sequentially separates and feeds sheets stacked on a removable sheet storage means using a plurality of coaxially arranged paper feeding rollers, at least one of the paper feeding rollers is arranged as an axis. When a predetermined sheet storage means is mounted, the slidable paper feed roller is configured to be slidable in the direction of the transfer paper stacked on the predetermined sheet storage means in conjunction with the mounting operation. A paper feeding device characterized in that the predetermined sheet storage means is provided with a guide member that moves the paper feeding roller to a position where it does not act. (2) In the paper feeding device according to claim 1,
A sheet feeding device characterized in that the guide member also serves as a width regulating member that regulates the attitude of the stacked sheets in the width direction. (3) A sheet feeding device according to claim 1, wherein the guide member is integrally formed with a casing of the predetermined sheet storage means.