JP2547049Y2 - Double feed prevention mechanism in paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a double feed prevention mechanism in a paper feeding device, and in particular, a processing device which sequentially feeds a plurality of sheet papers from the topmost sheet for each leaf. The present invention relates to a double feed prevention mechanism in a sheet feeding device adapted to be supplied to the side.

(Conventional technology and problems to be solved) Sheet paper is sequentially fed to a processing device such as an automatic labeling machine and a sheet printing machine that performs processes such as label sticking and printing for each sheet. In this case, the sheet feeding member faces a table on which a predetermined sheet of paper is placed, and feeds the sheet one by one from the uppermost sheet side to the processing apparatus side.

In this case, two or more stacked sheets may be sent out when they are fed out, and the sheets fed in such a state may cause a problem such as a paper jam in the processing apparatus. There is a risk.

In order to solve such a drawback, means such as loosening by blowing air on the paper placed on the paper feed table is used. However, for example, when there is a multi-feed of paper in an application in which there is a specific correspondence between each sheet of paper that is continuously and sequentially fed and a label attached thereto, Since the continuous correspondence relationship in a large number of products is lost, it is necessary to completely prevent double feed and feed all the sheets to the processing apparatus reliably in a sheet feeding apparatus for such an application. Is done.

(Means for Solving the Problems) Accordingly, an object of the present invention is to provide a multi-feed prevention mechanism in a reliable sheet feeding apparatus capable of reliably feeding sheets one by one. is there.

An object of the present invention is to provide a sheet feeder that feeds a plurality of loaded sheets from the uppermost sheet for each leaf and feeds the sheets to a processing device side. And a paper loading table that can be raised and lowered so as to maintain the top surface of the placed paper at a predetermined height, and intermittently abuts the top surface of the placed sheet paper, A sheet feeding member for sequentially feeding the uppermost sheet along the sheet feeding path; and a sheet feeding path having a gap larger than the thickness of one sheet and smaller than the thickness of two sheets of the sheet. And a pair of rolls provided so as to face each other, and when two or more sheets are sandwiched, the rolls are driven to rotate in the direction opposite to the feeding direction of the sheet and prevent double feed. A roll, and a sheet that has passed through the double feed prevention roll is sent to the processing device side. This is achieved by a double feed prevention mechanism in a paper feeding device, comprising at least a pair of paper feed rolls.

(Operation) In the present invention, the uppermost surface of the stack of a large number of sheet sheets placed on the sheet placement table is always at a predetermined height as the sheet placement table rises during paper feeding. Is done. In this state, the sheet feeding member comes into contact with the uppermost sheet, and the uppermost sheet is fed along the sheet feeding path by the feeding member. Thereafter, the sheet feeding member intermittently engages with the next sheet, sequentially feeds the sheet, and sends the sheet to the downstream double feed prevention roll.

Here, the sheet fed out one by one passes through a gap between a pair of double feed prevention rolls and is sent to the processing device side via a paper feed roll.

On the other hand, if the separation between the top sheet and the next sheet is not sufficient and two or more sheets (for example, two sheets) are fed simultaneously by the feeding member, the gap between the pair of double feed prevention rolls becomes two sheets. Since the thickness is smaller than the thickness of the sheet, two or more sheets are sandwiched between the double feed prevention rolls and are fed back along the sheet feeding path by the rotation of the roll driven in the direction opposite to the feeding direction, and placed on the sheet loading table. The paper is returned to the placed paper stack and the paper feeding is continued again.

Here, the driving roll is intermittently operated so as to abut the top surface of the paper stack only when the paper of each leaf is advanced, so that when the multi-fed paper travels in the reverse direction, the feeding roll is located above the stack. And does not interrupt the return operation of the sheet.

In the present invention, the gap of the paper feeding path between the pair of opposed double feed prevention rolls is adjustable, and an appropriate gap is set according to the thickness of the sheet used to prevent the double feed. It is preferable to be able to do so.

In addition, in the present invention, in order to give sufficient separation to each sheet prior to feeding of the sheet, the sheet is separated from each other in the feeding direction by rotating and abutting on the upper end of the sheet. A roll may be provided on the sheet mounting table side.

Embodiments The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is an explanatory view showing an outline of the configuration of a card labeler to which a double feed prevention mechanism is applied in the paper feeding device of the present invention.
FIG. 2 and FIGS. 3A to 3C are explanatory views showing the operation of the double feed prevention mechanism.

In FIG. 1, a stack P of a large number of cards serving as sheet sheets is placed on a card table 1 serving as a sheet placement table, and the top surface is rotated by rotating a delivery roll 2 serving as a sheet delivery member in a delivery direction. Are sequentially fed out one by one in the direction along the paper feeding path (to the left in the figure). The fed-out card passes through a gap between a pair of double feed prevention rolls 5 and 6 to be described later, and from a group of paper feed rolls 7 to 10 a series of processing roll groups R ₁ to R ₁ including a sticking roll R ₁ of a card labeler.
It is sent to the R ₃ side. Each roll is provided with a biting claw (not shown) for holding the card supplied to surely transfer the card between the rolls and bringing the card into close contact with a predetermined position on the roll surface. And phototube sensor pH is provided in the paper feed path between the paper feed rolls 7 to 10 and attached roll R _1, the feed of the label to be described later to detect the presence or absence of the card on the paper feed path Is output.

On the other hand, from the label stacker L it is sent to the stripping section, which is faced directly above the can stuck label Si protected the bonded surface with release paper Si adhered roll R ₁ continuously, the sharp tip When guided along the release plate H, the release paper Si is peeled off, and the adhesive surface of the label S is exposed. Sticking roll here
Wherein the upper surface of the card sent to the peripheral surface of the R ₁ label S is bonded, and a slit in the transport direction bisecting slitting roller R ₂ and 2 equally divided card in a direction perpendicular to the respective conveying direction after being shaped by the cutter roller R ₃ or the like for cutting, and is discharged through the conveyer C ₁ and C ₂ as labeled card.

The release paper Si peeled off from the label S is taken up by a take-up roller W via a marginal roll M, a dancer roller N and the like.

In this case, a one-to-one correspondence is continuously set in advance between each card and the label attached thereto,
If the card is not sent on the paper feed path, this is detected by the photoelectric tube sensor PH, the feeding of the label is stopped halfway, and a standby state is set until the card is sent.

Here, when two or more cards are simultaneously sent to the card labeler by the feeding roll 2, the correspondence with such a label is lost in each card after the multifeed card,
At least one lot of card products may be defective.

FIGS. 2 and 3A show the outline of the double feed prevention mechanism according to the present invention for preventing the simultaneous feeding of two or more cards.
3C will be described.

In the figure, a card table 1 on which a card stack P is placed
Is mounted on the frame of the card labeler so that the uppermost surface of the stack P is always flush with the sheet feeding path F. A paper feeding roll 2 is provided above the card table 1.
And which have feeding mechanism consisting of guiding arms 3 to intermittently contact is provided on the top surface of the card stack P, feed roll 2 is rotated in a second in the arrow B direction, the friction between the card P ₁ The engagement is sent out along the sheet feeding path F in the direction of arrow A in the figure.

Further, the table 1 is provided with a paper separating roll 4 that is in rotational contact with the upper part of the mounting end face of the card stack P,
The cards of each leaf, which are sequentially raised by raising the table 1, are moved in the direction of arrow A with respect to the next leaf card so as to provide clearance between the cards.

On the downstream side of the table 1, a pair of double feed prevention rolls 5, 6 are provided.
Are arranged to face each other with a gap G in the vertical direction with the sheet feeding path F interposed therebetween.

The gap G between the rolls 5 and 6 is set to be larger than the thickness of one card and smaller than the thickness of two cards. The gap G is set to a dimension corresponding to about 1.5 times the thickness of the card in the specific example shown in the figure, but this dimension is arbitrarily adjusted by appropriate means according to the thickness of the sheet used. Is done. For example, among the upper and lower double feed prevention rolls 5 and 6 arranged vertically, bearing portions (not shown) at both ends of the upper roll 6 are slidable in the vertical direction along the support portion, whereby the gap between the upper and lower rolls is reduced. The gap G of the paper feed path can be set according to the thickness of the paper.

The lower roll 5 of the pair of double feed prevention rolls is driven to rotate in a direction C opposite to the rotation direction B of the feeding roll 2, while the upper roll 6 is a free roll. It usually stops without rotating.

In such an embodiment, the card table 1 so that the upper surface of the card P ₁ of the top surface of the card stack P placed on the table 1 upon feeding the paper card is a paper feed path F and Ho Isuzu same height It is raised by a drive mechanism (not shown). At the same time, the paper separating roll 4 which is in contact with the end face of the placed card stack P is driven in the direction of arrow D so that each leaf card on the top of the stack P is slightly moved in the direction of arrow A more than the corresponding next leaf card. The cards are shifted so that they do not come into close contact with each other.

This condition activates the guide arm 3 and is brought into contact with the sheet feed roll 2 on the upper surface of the card P ₁ of the top surface of the card stack P. Then the card P ₁ by the rotation of the arrow B direction of the feeding roll 2 is paid out in the direction A in the figure along the feed path F.

Here, since the gap G between the pair of double-feed prevention rolls 5 and 6 on the downstream side is larger than the thickness of one card, the card P ₁ smoothly passes through the gap G as shown in FIG. 7,
8 (9, 10) to be supplied to the label sticking roll R ₁ of the card labeler first shown are the take-off.

Here the unwinding roll 2 of two or more cards, for example, when the card P ₂ of the card P ₁ and Tsugiha the uppermost surface is fed out at the same time, the gap G of the double feed prevention roller 5 and 6 of the two sheets since less than the thickness, roll 5 rotating the 3B card P ₁ and P ₂ as shown in Figure can not pass through the gap G, sandwiched multi-feed preventing roll 5,6 in the direction of arrow C
And the driving force of the roll 5 is transmitted through the cards P ₁ and P ₂ filled in the gap G and is rotated in the direction of arrow C ′ by the roll 6 in the reverse direction along the sheet feeding path F, that is, the card stack of the table 1. It is sent back to the P side. In this case, the contact of the sheet feeding roll 2 with the uppermost surface of the stack is intermittent, and since the sheet feeding roll 2 retreats above the stack P at the time of reverse feeding,
The card is fed back without any trouble by the rotation of the roll 5 and is positioned on the uppermost surface of the card stack P, and is fed out as the uppermost card at the next contact of the payout roll 2 as in a normal case.

Further, even if the two cards are fed in a state shifted in the front-rear direction, if the two cards are jammed in the gap G, the driving force of the lower roll 5 is transmitted to the upper roll 6. Attempts to rotate in the opposite direction as indicated by arrow C ',
Card P ₂ between the double feed prevention rolls 5,6 as shown in Figure is prevented from passing through the roll 5 of the lower, upper roll 6 if loosened the two cards is the reverse rotation as indicated by the arrow C ' card P ₁ without the can pass through the gap G.

Thus the paper feed card P ₁ passes through the gap G rolls 7,8
The lower card P ₂ is prevented from being fed by the gap G, and is contacted with the lower surface thereof by the roll 5 rotating in the direction of arrow C to the card stack P side of the table 1 along the sheet feeding path F. It is sent back.

As described above, in the embodiment of the present invention, the pair of double feeding prevention rolls 5 and 6 are provided along the paper feed path F on the downstream side of the paper feeding roll 2 and the gap G between the rolls is set to a thickness corresponding to one card. Halfbeak is large, and since than the thickness of the two sheets is set small, when the two component or more cards have been paid out at the same time, the card P ₁ and P ₂ is sandwiched multi-feed preventing roll,
Since the roll 5 of the downward and is rotated in the reverse direction rolls 6 rotating by the driving force of the roll 5 is also rotated in the direction opposite to the sheet feeding direction, the card P ₁ and P sandwiched in the gap G _Two
Automatically uppermost card P ₁ at the next feeding is returned to the uppermost surface of the stack is again fed, even if the sheet feeding operations as multifeed whole even if the card continuously without interruption Then, all the cards are sequentially fed one by one.

Further, when the double feed card is blocked by the rolls 5 and 6 and is not sent to the downstream paper feed path, the photoelectric tube sensor PH detects this and stops the supply of the label S until the next normal paper feed is performed. Therefore, a one-to-one correspondence between each card and the label attached thereto is always maintained.

Further, as a mechanism for preventing double feed, it is only necessary to provide a pair of rolls 5 and 6 on the downstream side of the card table 1, so that the structure is extremely simple.

In the embodiment of the present invention, the lower roll 5 of the pair of double feed prevention rolls 5 and 6 is a drive roll that rotates in the direction opposite to the feeding direction. However, the upper roll 6 or both upper and lower rolls are used. Such a drive roll may be used.

As a sheet feeding member, a feeding roll 2 shown in the drawing is used.
Other, any long member that operates to pay out this by intermittently contact with the sheet P ₁ in the uppermost surface in the sheet feed direction is used.

(Effects of the Invention) According to the present invention, simultaneous feeding of two or more sheets from a sheet feeding device can be reliably prevented by a simple mechanism, and all sheets can be fed in a predetermined order. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a card labeler to which the present invention is applied, and FIGS. 2 and 3A to 3C are explanatory views showing an outline of a double feed prevention mechanism of the present invention. DESCRIPTION OF SYMBOLS 1 ... Card table 2 ... Paper feeding roll 3 ... Guide arm 4 ... Paper handling roll 5, 6 ... Double feed prevention roll 7-10 ... Paper feeding roll F ... Paper feeding path G ... Roll gap PH… Card detection sensor P ₁ … Top card P ₂ …… Next card (multi feed card)

Claims (4)

(57) [Scope of request for utility model registration] An anti-multifeed mechanism in a sheet feeder configured to feed out a plurality of sheets of paper from an uppermost sheet for each leaf and to supply the processed sheets to a processing device side. A sheet placement table 1 which can be raised and lowered so as to maintain the top surface of the placed and placed sheets at a predetermined height, and intermittently abuts the top surface of the placed sheet P. A sheet feeding member 2 for sequentially feeding the uppermost sheet along the sheet feeding path; and a gap G larger than one sheet thickness and smaller than two sheet thicknesses. It comprises a pair of rolls 5 and 6 provided facing each other along the paper feeding path, and when two or more sheet papers are sandwiched, the rolls 5 and 6 are opposite to the feeding direction of the sheet papers. A double feed prevention roll rotated in the direction; A double feed prevention mechanism in a paper feeder, comprising: at least a pair of paper feed rolls for feeding paper to a processing device side. 2. One of the pair of rolls 5, 6 is driven to rotate in a direction opposite to the sheet feeding direction, and the other roll 6 is rotated freely, and two or more sheets are rolled. 2. The method according to claim 1, wherein when a sheet is sandwiched, the rolls are rotated in a direction opposite to a direction in which the sheet is fed.
The double feed prevention mechanism described. 3. The double feed prevention mechanism according to claim 1, wherein a gap G in a sheet feeding path between the pair of rolls 5 and 6 is adjustable. 4. The sheet mounting table 1 is provided so as to be in rotational contact with the mounting end face of the sheet P placed as described above, so as to sequentially shift each sheet in the feeding direction. The seriousness prevention device according to claim 1 or 2, further comprising a paper separating roll (4).