JPS6359930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a paper feeding device for sequentially separating and feeding stacked sheets of paper starting from the top layer, in copying machines, printing machines, etc. It is.

Prior Art In a conventional paper feeding device in which paper separation claws called so-called corner separators or corner nut bars are provided at both corners of paper for stacking,
If the separating claw is not kept in secure contact with the paper, feeding of two sheets of paper (so-called double feeding) or diagonal feeding of the paper will occur, resulting in paper jams and problems with copying machines and printing. This was a major cause of reduced reliability of the machine's paper handling equipment.

In addition, in paper feeding devices that use separation claws, the distance between the paper feed roll and the separation claw is an important parameter for paper feeding, and the distance between the paper feed roll and separation claw is an important parameter for paper feeding. This requires a complicated mechanism or requires a plurality of paper feed rolls to be provided at positions suitable for each paper size, which is a factor in increasing costs.

The paper feeding device shown in Figs.
165636), a separation claw b and a paper feed roll c are provided only on one side of the stacked paper a on the reference line side, and a pair of upper and lower paper transport rolls d are provided in front of the paper feed direction x.
is arranged so that a transporting force is applied only to one side of the reference line side of the top layer of laminated paper _a1 .

In the paper feeding device, a fixed paper side guide e is arranged on one side of the reference line, a movable paper side guide f is arranged opposite to this, and a movable paper end guide is arranged on the opposite side to the paper feeding direction x. g is arranged.

A separation claw b is provided only on one side of the laminated paper a on the reference line side, and a paper feed roll c is provided at an appropriate position near the separation claw b.
The purpose is to ensure separation of the sheets by locating them, and to prevent skew feeding by the side guides e and f.

In addition to the paper feed roll c in the conventional example, a roller is used that does not drive itself but regulates the movement of the paper toward one side guide.
There is also an example (Japanese Utility Model Publication No. 54-96983) in which the paper is fed along one side guide to prevent skew feeding.

Problems to be Solved by the Invention However, in the former case, although the side guides e and f prevent the paper from being fed diagonally, the paper feed roll is disposed biased toward one side guide. , the friction between the top layer of paper being fed and the paper below it acts unbalancedly, creating a force that constantly rotates the paper. There is a risk that it will be bent and fed diagonally.

Note that even when no bending occurs, forces other than the feeding direction are always acting on the paper, and smooth feeding cannot be expected.

Furthermore, in the latter case, which uses rollers to restrict the paper toward the side guides, the restricting force is always exerted, and smooth feeding cannot be expected.

Means and Effects for Solving the Problems The present invention relates to an improvement of a paper feeding device that eliminates the above-mentioned drawbacks. Claw 2
and a first feed roll 3 which is rotationally driven first, and at least one second paper feed roll 4 which is rotationally driven after the rotation of the first feed roll 3. It is disposed on or adjacent to an extension line in the width direction perpendicular to the paper feeding direction from the first feeding roll 3 and near the average value of the center position in the width direction of the paper to be fed, and its purpose is The purpose of this invention is to provide a highly reliable, low-cost paper feeding device that can reliably feed sheets one by one without being affected by changes in paper size and without diagonally feeding the sheets.

The present invention provides paper separation claws 2 and first feeding rolls 3 only on the reference line side of a paper feeding device such as a copying machine in which the feeding reference is on one side. Even if the change is made, the distance between the separating claw 2 and the first feed roll 3 can be maintained constant, and the first feed roll 3, which is driven first, reliably separates the stacked sheets one by one from the top layer. can be separated into

Further, in the present invention, in the one-side-based feeding device provided with the paper separating claw 2 and the first feeding roll 3, the first feeding roll 3 is located on a width direction extension line perpendicular to the paper feeding direction or At least one second feed roll 4 for feeding paper is disposed adjacent to the same line and near the average position of the center position in the width direction of the paper to be fed, and rotation of the first feed roll 3 is provided. Since the rotational drive is delayed after the driving, the uppermost layer of paper separated by the paper separation claw 2 and the first feed roll 3 is sent out to a predetermined value by the second paper feed roll 4. It is possible to smoothly and reliably feed the paper along the same direction without applying any force other than the same direction while the paper is oriented in the same direction, and skew feeding can be prevented.

Embodiment An embodiment of the present invention shown in FIG. 4 will be described below. Reference numeral 1 denotes sheets of copying paper that are cut and stacked as shown in solid lines. The laminated paper 1, together with the illustrated laminated paper of different sizes, is fixed so that it is always engaged with a paper separation claw 2 disposed at the corner where the front edge in the paper feeding direction intersects with its left edge. The stacked paper 1 is held by a side guide 6 on the reference line side, an opposite side guide 7 movably disposed relative to the side guide 6, and an end guide 8 movably disposed on the rear end side of the laminated paper 1. There is.

Further, the first paper feed roll is spaced apart from the paper separation claw 2 by a required interval l suitable for paper feeding that does not cause double feeding or erroneous feeding, and is oriented in the width direction perpendicular to the paper feeding direction x. 3 is arranged and the same 1st
The distance from the outer end surface of the paper feed roll 3 to the reference line located on the inner surface of the fixed side guide 6 is set to Amm, and the distance from the center of the first paper feed roll 3 to the front end surface of the laminated paper 1 is set to Amm. The distance is set to Bmm.

Therefore, the following relationship holds true between the interval l and distances A and B, and the interval l is 10 to 10 for ordinary copy paper.
Within a range of 100mm.

l=√ ² + ^2The first paper feed roll 3 is constantly pressed down by weight, spring force, etc. to the top layer of paper 1 of the stacked paper 1, or has a cam mechanism that operates according to a predetermined timing. , the pressure is intermittently lowered by a sequence control mechanism.

Furthermore, a one-way clutch (not shown) transmits rotational force to the first paper feed roll 3 so as to feed the top layer of paper 1 in the paper feeding direction x from the drive shaft 3a, but does not transmit rotational force in the opposite direction. is built-in.

Further, a second paper feed roll 4 is pivotally supported along the center extension line of the first paper feed roll 3 and oriented in the same direction.
It is installed at the average value position of the center position 0, 0', 0'' in the width direction (direction perpendicular to the paper feeding direction) of the paper 1 of various dimensions shown by the dotted chain line.
The paper feed roll 4 also has a built-in one-way clutch similar to the first paper feed roll 3.

Furthermore, a pair of upper and lower paper transport rolls 5 are disposed parallel to the paper feed rolls 3 and 4, slightly above the top layer of the stacked paper 1 and on the paper feed direction x side.

The first paper feed roll 3 and the second paper feed roll 4 are driven to rotate according to a time chart as shown in FIG.

Since the embodiment shown in FIG. 4 is configured as described above, when a paper feed start signal is transmitted from a control device (not shown), the first paper feed roll 3 starts rotating, and the uppermost laminated paper 1 is buckled between the paper separation claw 2 and the first paper feed roll 3, and the corner portion of the paper 1 is separated by the paper separation claw 2.

When the buckling and separation of the corners of the paper 1 is completed, the drive rotation of the first paper feed roll 3 is stopped and the drive rotation of the second paper feed roll 4 is started, so that only the top layer paper 1 is removed. The paper is fed along the paper feeding direction x while being guided by both side guides 7 and 8.

At this time, there is no force acting on the second paper feed roll 4 in any direction other than the paper feeding direction x, and since it acts on the substantially central position of the paper, the paper is fed out smoothly.

Furthermore, when the front edge of the top layer paper 1 is sandwiched between the pair of upper and lower paper transport rolls 5, the drive rotation of the second paper feed roll 4 is also stopped, and only the top layer paper 1 is not shown due to the rotation of the paper transport roll 5. It is fed to the next stage processing equipment.

Thus, in the embodiment shown in FIG.
Only the top layer paper 1 is buckled and separated by the first paper feed roll 3, and the paper feed direction x is separated by the second paper feed roll 4.
Since the sheets can be transported along the same direction, it is possible to prevent erroneous feeding such as double feeding or diagonal feeding, and the reliability of paper feeding can be significantly improved.

Furthermore, since the reference for setting the stacked paper 1 is set at the leading end of one side, the operator can easily set different types of stacked paper 1.

Furthermore, only one set of the paper separation claw 2 and the first paper feed roll 3 for buckling separation is sufficient, and it is sufficient to simply add the second paper feed roll 4. Moreover, these portions 2, 3,
4 can be fixed at a constant position regardless of changes in the width of the laminated paper 1, so the structure is extremely simple and costs can be significantly reduced.

In the embodiment shown in FIG. 4, the first paper feed roll 3 is oriented in the width direction of the laminated paper 1, but as shown in FIG. It may be arranged so as to be inclined toward the separation claw 3, and in such an embodiment, the paper separation function is further improved.

In addition, if there is a large difference in width between the widest paper and the narrowest paper among the stacked papers 1, two or more of the second paper feed rolls 4 are arranged along the axis of rotation, and these Among the plurality of second paper feed rolls 4,
It is sufficient to selectively rotate only the required rolls 4 via a clutch or the like.

Although the present invention has been specifically described above with reference to the embodiments illustrated in the drawings and other embodiments, the present invention is of course not limited to such embodiments, and the scope of the invention does not depart from the spirit of the invention. Various design modifications can be made within the system.

Effects of the Invention According to the present invention, first, the sheets are reliably separated by rotational driving of the first feeding roll, and then the separated sheets can be smoothly sent out in the feeding direction by rotational driving of the second feeding roll. Therefore, it is possible to reliably and smoothly feed sheets one by one regardless of the size of the sheets without causing diagonal feeding.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional one-sided reference paper feeder, Figure 2 is a plan view thereof, Figure 3 is a plan view of a similar paper feeder with improved buckling separation performance, and Figure 4 is a bookmarker. A plan view illustrating an embodiment of the paper feeding device according to the invention, FIG. 5 is an operation time chart of the first and second paper feeding rolls in the same embodiment, and FIG. 6 is a plan view of another embodiment. . 1... Laminated paper, 2... Paper separation claw, 3... First paper feed roll, 4... Second paper feed roll, 5... Paper transport roll.

Claims (1)

[Claims] 1. In a copying machine paper feeding device in which the paper feed reference is on one side, a paper separation claw 2 is provided only on the reference line side,
A first feed roll 3 that is rotationally driven first is provided, and at least one second paper feed roll 4 that is rotationally driven after the rotation of the first feed roll 3 is provided. A paper feeder characterized by being disposed on or adjacent to an extension line in the width direction perpendicular to the paper feeding direction from the feed roll 3 and close to the average value of the center position in the width direction of the paper to be fed. Device.