JPH0412045Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sheet feeding device, and more specifically, the present invention relates to a sheet feeding device, and more specifically, the present invention is directed to a sheet feeding device that uses a separation mechanism that prevents double feeding of sheets fed from the sheet loading portion. This invention relates to a structure for blocking the rear end of a sheet that is returned to the original position.

(Prior Art) As is well known, devices for feeding sheets such as recording paper, transfer paper, printing paper, etc. are equipped with a separation mechanism to prevent double feeding of sheets fed out from a sheet stacking section. I have something prepared.

An example of the above-mentioned mechanism is a mechanism that is located above the sheet stacking section and can move toward and away from the top layer of the stacked sheets, and when the sheet is fed out, the mechanism is positioned above the sheet stacking section and is able to move toward and away from the top layer of the stacked sheets. It consists of a feeding roller that contacts and rotates in the rotational direction along the feeding direction of the sheet, and a pair of rollers that face each other with the sheet fed out from the sheet loading section in between. The roller on one side located at is configured to be able to rotate in the direction in which the sheet can be fed out, and the roller on the other side facing this is configured to rotate in the opposite direction to the roller on the one side described above, that is, to return the sheet. It is configured so that it can be rotated in any direction.

In the above-mentioned separation mechanism, the frictional force F 1 between one of the pair of rollers (hereinafter referred to as the normal rotation roller) and the sheet is reduced to the frictional force F ₁ between the sheet and the other roller (hereinafter referred to as the reverse rotation roller). By setting the frictional force _F2 to be larger than the frictional force F2 between the sheets, and setting the frictional force _F2 mentioned above to be larger than the frictional force _F3 between the sheets, the The sheets on the forward rotation roller side are fed out, and the sheets on the reverse rotation roller side are pushed back toward the sheet stacking section, thereby preventing double feeding of sheets.

By the way, the sheet pushed back toward the sheet loading section by the above-mentioned reversing roller may be pushed back at a considerable speed by the rotational force of the reversing roller. It may end up moving further back than the normal position between the two. Therefore, when the returned sheet is fed out again in such a state, there is a risk that the sheet cannot be fed out due to the lack of correspondence with the feeding roller, leading to feeding errors. Ta.

Conventionally, in order to solve this problem, a structure has been developed in which a column-shaped regulating part is provided on the rear end side of the sheet loading section in the sheet feeding direction to block the rear end of the sheet in the sheet feeding direction. Proposed.

That is, the above-mentioned structure includes a structure in which a sheet trailing end stopper that is slidable in the longitudinal direction of the sheet is provided on the loading table surface (for example, Japanese Patent Application Laid-Open No.
197135), or a structure in which a column-shaped rod is provided at the rear end of the sheet on a sheet loading table with a height corresponding to the sheet loading capacity and has the habit of pressing the rear end of the sheet (for example, −
Publication No. 44417).

(Problem to be solved by the invention) However, in the above-mentioned structure for regulating the rear end of the sheet in the sheet feeding direction, if the regulating part is fixed, the size of the sheet set on the placing part is limited. Otherwise, there is a risk that the restricting portion may become an obstacle when setting the sheet, making it impossible to set the sheet.

Furthermore, if the above-mentioned columnar sheet rear end presser is raised in accordance with the rise of the sheet mounting table, an upper space corresponding to the height of the sheet presser is required, and as a result, the apparatus inevitably becomes larger.

SUMMARY OF THE INVENTION In view of the problems in conventional sheet feeding devices, particularly in the structure that blocks the rear end of the sheet in the feeding direction when the sheet is pushed back into the loading section, the purpose of the present invention is to In addition, sheets can be set smoothly and the rear edge of the sheet can be reliably stopped even when the sheet loading section is raised, and the device does not need to be enlarged unnecessarily. An object of the present invention is to obtain a sheet feeding device having a structure capable of preventing such problems.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a feeding path for sheets fed from the sheet loading section that can be raised and lowered by a feeding roller provided on the sheet loading section. A pair of rollers is provided in the holder, and one of the rollers is rotated in a direction opposite to the feeding direction of the sheets to feed only one sheet in a multi-feed state and return the other sheets to the above-mentioned loading section. In a sheet feeding device equipped with a separation mechanism capable of separating the sheet, the sheet feeding device is located on the side in the sheet width direction with respect to the sheet stacking section, and is set at the same height regardless of the vertical movement of the sheet stacking section. a guide member that is displaceable in a direction, and a guide member that is located on one side edge of the rear end of the sheet placing section in the sheet feeding direction of the guiding member, and one end is displaceable on the sheet placing section. a swinging rod that is rotatable between a position where it can face and abut the rear end of the sheet in the feeding direction and a position where it can be retracted from the feeding path of the sheet, and provided at one end of the swinging rod,
A holding part is provided which can come into contact with the rear end in the feeding direction of the upper sheet on the sheet placing part, and the holding part is provided in the same position in the rotating direction of the swinging rod regardless of the raising and lowering movement of the sheet placing part. Accordingly, the holding portion of the swinging rod can be selected to either a position facing the rear end of the sheet in the feeding direction or a position retracted from the sheet feeding path.

(Function) According to the present invention, the swinging rod faces the rear end of the sheet in the feeding direction at the same position regardless of the vertical movement of the sheet placement section, in other words, regardless of the position in the height direction. This allows the holding portion to block the rear end of the sheet.

Further, when setting sheets, by retracting the swinging rod from the sheet feeding path, it is possible to avoid obstructing loading of sheets.

(Example) Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is an external view showing a sheet loading section in a sheet feeding device according to an embodiment of the present invention.

In the same figure, reference numeral 1 denotes a sheet loading table which constitutes a sheet loading section, and is configured to be able to interlock with a lifting device (not shown). Since then, it has been moved.

On the other hand, the sheet mounting table 1 described above has a rectangular hole 1a in which the longitudinal direction is set along the width direction of the sheet orthogonal to the sheet feeding direction (direction indicated by reference symbol D in the figure). A plurality of guide members 2 are provided, and a columnar guide member 2 protrudes from the square hole 1a.

The above-mentioned guide member 2 is a member for aligning both ends of the sheet in the width direction, and is movable along the width direction of the sheet via a mechanism not shown. It is displaced and fixed at both ends. The upper end of this guide member 2 is fixed by a beam member passed between each guide member, so that all displacement positions on the same side in the seat width direction are the same.

Further, the upper part of the front end side in the sheet feeding direction of the sheet mounting table 1 described above is capable of approaching and separating from the uppermost sheet on the sheet placing table 1, and is capable of feeding out the sheet in the feeding direction. A feeding roller 3 is provided which is set to rotate in the direction.
A sheet separation mechanism 4 is provided further to the front end side of the feed roller 3.

The separation mechanism 4 includes a pair of rollers 4a and a roller 4b facing each other with the sheet in between.

Among the above-mentioned rollers, one roller 4a constitutes a forward rotation roller, similar to the conventional roller described above, and the other roller 4b constitutes a reverse rotation roller, and the other roller 4b constitutes a reverse rotation roller and rotates among the sheets that are multi-fed. The sheet on the side facing the reversing roller 4b is pushed back.

On the other hand, in the guide member 2 located on one side in the sheet width direction in the guide member 2 described above, the upper end of the guide member 2 is provided at a position corresponding to the rear end in the parallel direction, that is, the rear end in the sheet feeding direction. An end holding mechanism 5 is provided.

That is, the sheet trailing edge holding mechanism 5 is attached to the L fixed to the side surface of the guide member 2, as shown in the second figure.
A letter-shaped bracket 50, a flange-equipped support shaft 51 that is inserted into and pivotally supported by the horizontal piece 50a of this bracket 50, and a swinging rod 52 and a knob that are each integrally attached to this support shaft 51. 53, and a disc spring 54 interposed between the knob 53 and the swinging rod 52.

The above-mentioned swinging rod 52 is configured to be able to move in conjunction with a knob 53 via a support shaft 51 to which the proximal end is pivotally connected due to the pressing action of a disc spring 54, and by turning the knob 53, the seat surface is adjusted. It is designed to be able to swing parallel to the

Further, the swinging rod 52 is also brought into pressure contact with the horizontal piece 50a of the bracket 50 due to the pressure contact action of the disc spring 54, so that it is held in the position after swinging due to the rotational position of the knob 53. It has also become familiar.

The elastic force of the disc spring 54 described above is set to be sufficient to block the rear end of the sheet against the moving force of the sheet being pushed back by the reversing roller 4b.

On the other hand, the free end of the swinging rod 52 is provided with a pressing part 52a bent downward, and this pressing part 52a is located at the upper part of the sheet stacking table 1 in the sheet stacking direction. It is bent to a length that allows it to face the rear end of the sea. Furthermore, a chain 55 is attached to this holding portion 52a.
One end of the chain 55 is held suspended, and the length of the chain 55 is set to reach the top surface of the sheet mounting table 1 when it is at the lowest position.

Since this embodiment has the above-described structure, when setting a sheet on the sheet mounting table 1, the swinging rod is placed at the position indicated by the symbol A in FIG. 52.

Therefore, since there is no member in the sheet feeding path for blocking the rear end of the sheet, the sheet loading operation can be easily performed.

In addition, when the guide member 2 is moved to the side in the sheet width direction depending on the size of the seat, the swinging rod is moved according to the moving position of the guide member 2, as shown by the two-dot chain line in FIG. By turning the knob 53 of 52, the holding portion 52a can be brought into contact with the rear end of the sheet in the feeding direction.

On the other hand, when the sheet is to be fed out after the sheet has been set, the swinging rod 52 is swung to a position where its holding portion 52a abuts the rear end of the sheet in the feeding direction.

When the sheet loading table 1 rises as the sheet is fed out, the swinging rod 52
Since the holding part 52a is bent to a length that can block the rear end in the feeding direction of the upper part of the sheet on which it is placed, the position of the holding part 52a does not change even if the sheet placing table 1 rises. It is possible to continue blocking the rear end of the sheet.

In order to be able to block the rear ends of sheets of different sizes using the swinging rod 52 described above, for example, the swinging position of the swinging rod 52 is displayed on the mounting table surface, and the The swinging position may be determined by aligning the chains 55, so that the facing relationship with the rear end of the sheet can be easily determined.

(Effects of the invention) As described above, according to the invention, the guide member movable in the width direction of the sheet is provided at the rear end of the sheet in the sheet feeding direction, and the position opposite to the rear end of the sheet in the sheet feeding direction is adjusted. Since the swinging rod is provided with a swingable holding part at a position where it can be retracted from the road, it can always face the rear end of the sheet in the feeding direction. Therefore, it is possible to reliably block the rear end of the sheet pushed back onto the sheet loading table by the reversing roller and prevent the sheet from shifting when the next sheet is fed out.Furthermore, when setting the sheet, the sheet can be By retreating from the feeding path, the sheet can be placed and placed smoothly without getting in the way.

Further, according to the present invention, a swinging rod is provided for the guide member that is located at the side edge in the sheet feeding direction and is movable in the width direction of the sheet, and the holding part of the swinging rod is connected to the sheet on the loading table. Since it is formed with a length that allows it to face the rear end of the sheet located at the top of the sheet, the position of the swinging rod in the height direction does not change even if the sheet mounting table rises. No space above the upward stroke of the sheet mounting table is required. Therefore, compared to a case where the mechanism that blocks the rear end of the sheet rises as the sheet loading table rises, the height of the paper feeder does not need to be made higher than necessary, and this reduces the size of the apparatus. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a sheet loading table in a sheet feeding device according to an embodiment of the present invention, FIG. 2 is a side view showing main parts of a sheet feeding device according to an embodiment of the present invention, and FIG. FIG. 3 is a plan view of the main parts shown in FIG. 1... Sheet mounting table, 2... Guide member, 3...
Feeding roller, 4... Separation mechanism, 4A... Normal rotation roller, 4b... Reverse rotation roller, 5... Sheet trailing edge holding mechanism, 52... Rocking rod, 52a... Holding portion, 53... Knob.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of rollers is provided in the feeding path of the sheet fed from the sheet loading section by a feeding roller provided on the sheet loading section which can be raised and lowered, and one of the rollers is In a sheet feeding device equipped with a separation mechanism capable of feeding only one sheet in a multi-feed state and returning other sheets to the above-mentioned loading section by rotating the sheets in a direction opposite to the feeding direction of the sheets. , a guide member that is located on the side of the sheet resting section in the sheet width direction, is set at the same height and is movable in the sheet width direction irrespective of the vertical movement of the sheet resting section; and the guide member The guide member is integrated with a guide member located on one side edge of the rear end in the sheet feeding direction of the sheet placing section, and has one end facing the rear end in the sheet feeding direction on the sheet placing section. a swinging rod that can be rotated between a position where it can touch the sheet and a position where it can be retracted from the feeding path of the sheet; a holding part that can come into contact with the end of the swinging rod, and the holding part of the swinging rod is moved out on the sheet in accordance with the rotating direction of the swinging rod at the same position regardless of the raising and lowering movement of the sheet placing section; A sheet feeding device characterized in that it is possible to select either a position facing a rear end in a direction or a position retracted from a sheet feeding path.