JPS63288832A - Sheet feeder - Google Patents

Abstract

PURPOSE:To surely prevent double feed of sheet by providing a means for stopping rotary driving of a feeding member when a first sheet is separated from the feeding member. CONSTITUTION:Upon operation of a drive motor 21, a feed roller 13 and a take-out roller 14 are rotary driven, and the frontmost single sheet 12 is fed out. When the rear end of the single sheet 12 separates from the feed roller 13, the single sheet 12 is further fed out with the leading end thereof being held by a pair of carry-out rollers 16, 16 so as to interrupt light being transmitted from a light emission element 17. Consequently, a stop signal is fed from a control section 20 to the drive motor 21 so as to stop rotary driving of the feed roller 13. A second single sheet 12 is pressure contacted with the stopped feed roller 13. As a result, braking force is applied onto the second and following single sheets 12, thus preventing simultaneous taking-out of single sheet 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sending device that is provided in, for example, a form printing device and sends out slips one by one.

(Prior Art) As this type of delivery device, for example, the one shown in FIG. 4 is known. That is, in the figure, reference numeral 1 denotes a storage section, in which sheets 2 are stacked in an upright position, and a feed roller 3 is pressed against the frontmost sheet 2. A take-out roller 4 is provided below the feed roller 3, and this take-out roller 4 has a double-sheet-taking prevention roller 5.
are in close proximity. Furthermore, a pair of conveyance rollers 6.6 are disposed below the take-out roller 4 and the double-sheet taking prevention roller 5.

A one-way clutch 7 is provided on the double-sheet prevention roller 5, and the roller 5 is configured to idle in the direction of the arrow in the figure. This double number prevention cola 5 is locked in the take-out direction when sending out the -F Father's Day ticket, and the number of tickets 2
Due to the reaction, the roller 5 idles in the opposite direction to the take-out direction.
Removal of the second and subsequent tickets is prevented. Further, the feed roller 3 is composed of a rubber portion 8 and an aluminum portion 9, and the length of the rubber portion 8 is determined depending on the cut sheet 2 to be handled. When this feed roller 3 rotates, a driving force is applied to the ticket 2 in the rubber part 8, but no driving force is applied to the aluminum part 9, thereby preventing the cutting of two tickets 2. It has become.

(Problem to be Solved by the Invention) However, in the past, when the aluminum portion 9 of the feed roller 3 and the cut sheet 2 slip, due to the slight difference in frictional force between the cut sheets 2 and There was a problem in that two sheets were taken.

[Structure of the Invention (Means for Solving the Problems)] In order to solve the above-mentioned problems, the present invention presses a feeding member against a plurality of stacked paper sheets, and by rotationally driving the feeding member, In the device that sends out the paper sheets one by one,
The apparatus is characterized by comprising a stop means for stopping the rotational drive of the feeding member when the first paper sheet sent out by the feeding member leaves the feeding member.

(Function) By the above means, the feeding member whose rotational drive has been stopped is brought into pressure contact with the second and subsequent paper sheets to apply a braking force to the second and subsequent paper sheets.
Made it possible to prevent sheet removal.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 3.

FIG. 1 shows a ticket feeding device, and numeral 11 in the figure is a storage section. This storage section 11 has a cut sheet 12 for paper sheets.
... are stacked in an upright position, and a feed roller 13 as a feed member is pressed against the frontmost cut 12.

A take-out roller 14 is provided below the feed roller 13, and a double-sheet prevention roller 15 is closely opposed to the take-out roller 14 with a distance of about 1.5 times the thickness of the cut sheet 12. There is. Further, a pair of conveyance rollers 16, 16 are disposed below the take-out roller 14 and the second extraction prevention roller 15. Furthermore, a detection sensor 19 consisting of a light emitting element 17 and a light receiving element 18, which together with a control section 21 (described later) constitute a stopping means, is provided on the discharge side of the conveyance rollers 16, 16.

A drive motor 21 for the feed roller 13 and take-out roller 14 is connected to the light receiving element 18 via a control unit 20, and when the light receiving element 18 does not receive light, the drive motor 21 is connected to the drive motor 21 via the control unit 20. A drive stop signal is sent.

Further, a one-way clutch 23 is provided on the drive shaft 22 of the double-sheet prevention roller 15, so that it idles in the direction of the arrow in the figure. When the first cut 12 is taken out, this second extraction prevention roller 15 is locked in the take-out direction, and due to the reaction of the cut 12, the roller 15 idles in the opposite direction to the take-out direction. This prevents the second and subsequent tickets 12 from being taken out. Further, the take-out roller 14 has a structure as shown in FIG. Even if it stops, it will still spin in the direction of the arrow.

Further, the ticket 12 is always pressed toward the feed roller 13 and take-out roller 14 by a pressing spring 27 via a backup 26.

Note that a rubber band or the like may be used instead of the double-sheet prevention roller 15.

Next, the operation of the above-mentioned feeding device will be explained.

When the drive motor 21 operates, the feed roller 13 and the take-out roller 14 are rotationally driven, and the frontmost cut sheet 12 is sent out. When the rear end of the ticket 12 is separated from the feed roller 13, the tip thereof is held between a pair of conveyance rollers 16, 16 and further sent out from the light emitting element 17, as shown in FIG. Block the emitted light. As a result, a drive stop signal is sent from the control unit 20 to the drive motor 21, and the rotational drive of the feed roller 13 is stopped. At this time, the second sheet 12 is placed on the stopped feed roller 13.
are pressed together.

As described above, when the rear end of the ticket 12 separates from the feed roller 13, the rotation of the feed roller 13 is stopped and the second ticket 13 is brought into pressure contact with the second and subsequent tickets 13. A pair of conveyor rollers 16, 1 can provide braking force.
6, even if the first ticket 12 is taken out, the second and subsequent tickets 12 are not taken out at the same time.

Note that when the cut sheet 12 is sent out by the pair of transport rollers 16, 16, the cut sheet 12 is separated from the feed roller 13, and the take-out roller 14 idles, so even if the drive motor 21 is stopped, the cut sheet 12 is separated from the feed roller 13. , it will not become a resistance to extraction.

Furthermore, since the detection sensor 19 is movable in the direction of the arrow in the figure, even if the length of the sheets to be handled varies, by changing the position of the detection sensor 19 in response to the change, the same operation as described above can be achieved. It is possible to prevent taking two pieces.

Although the detection sensor 19 is made movable in the above embodiment, the present invention is not limited to this, and even if the feed roller 13 is made movable, the same function as described above can be achieved.

Further, the feed roller 13 and the take-out roller 14 may be driven by separate drive motors.

Further, in the above embodiment, a form printing device has been described, but the present invention can also be applied to taking out paper from a copying machine, taking out original documents from a facsimile machine, etc.

[Effects of the Invention] As explained above, according to the present invention, it is possible to reliably prevent double sheet taking and improve reliability.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a configuration diagram showing a cut sheet delivery device, FIG. 2 is an explanatory diagram showing a cut sheet take-out operation, and FIG. 4 is a configuration diagram showing a take-out roller, and FIG. 4 is a configuration diagram showing a conventional example. 12... Single sheet (paper sheet), 13... Feed roller (feeding member), 19... Detection sensor (stopping means), 20
...Control unit (stopping means). Applicant's agent Patent attorney Takehiko Suzue',,':11 Figure 2 Zuka Figure 3? 34 Figure

Claims (3)

[Claims] (1) In an apparatus in which a feeding member is pressed against a plurality of stacked paper sheets and the paper sheets are fed out one by one by the rotational drive of the feeding member, the first sheet is sent out by the feeding member. A paper sheet retrieval device characterized by comprising a stop means for stopping the rotational drive of the feeding member when the leaves are separated from the feeding member. (2) The stopping means comprises a sensor that detects the leading end of the paper sheet, and a control section that stops the rotational drive of the feeding member based on a detection signal from this sensor. The paper sheet feeding device described. (3) The paper sheet delivery device according to claim 2, wherein the sensor is provided movably.