JPH0340994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an automatic sheet winding and discharging device that automatically winds and discharges sheets such as paper and film around a rotating drum.

<Prior Art> As a device for winding sheets such as paper or film around a drum, there are, for example, a device for mounting document paper or recording paper on a drum in a facsimile machine, or a device for mounting document paper on a drum in a copying machine.

However, the conventionally proposed devices of this type have the disadvantage that the mechanism is too complicated and tends to increase in size.Furthermore, the leading edge of the sheet may be misaligned with respect to the drum, or the sheet may not be ejected from the drum circumference. It had a major problem of being easy to use and lacking in reliability.

<Purpose> The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a sheet tip positioning device provided on the circumferential surface of a rotating drum so as to be rotatable in the circumferential direction of the drum. A first pawl and this pawl work together to clamp the sheet, and when ejecting, the first pawl works together to release the clamping state and remove the leading end of the loaded sheet from the drum circumferential surface. a second claw for peeling; a paper discharge guide member for guiding the sheet peeled from the drum by the second claw to a discharge section;
By providing a cam means for appropriately operating the first and second pawls according to the rotation of the drum in one direction, the mechanism is simple and suitable for miniaturization, and furthermore, the mechanism is simple and suitable for miniaturization, and furthermore, the drum can be stopped or rotated. An object of the present invention is to provide a highly reliable automatic sheet winding and discharging device that can automatically supply a sheet in a state in which the sheet is wrapped around a drum, and can reliably wind and discharge the sheet.

<Example> The present invention will be explained in detail below based on the drawings.

FIG. 1 is a schematic configuration diagram when the automatic sheet winding and discharging device according to the present invention is used in a document feeding device of a copying machine.

In the figure, the original 1 is fed by paper feed rollers 3a and 3b.
and the drum 2 by the timing rollers 4a and 4b.
The document is fed into a document support section having claws 5 and 6.
In this device, the leading edge of the document 1 is supported by claws 5 and 6, and is wrapped around the drum 2 while the light source 7 of the exposure section is
Exposure is performed at points a and 7b. Then, it rotates a preset number of times, the exposure is repeated, and after the predetermined operation is completed, the support for the document is released, and then the claw 6
The document is peeled off from the drum 2 and discharged from the discharge rollers 8a and 8b.

Both the second and third figures are detailed views of the drum section, which is the key point of the present invention. The claws 5 and 6 are attached to shafts 17 and 18 supported by a side plate 19. On the other hand, a drum shaft 20 for supporting and rotating the drum has a cam 12 (12a, 12b) that is fixedly supported regardless of the rotation of the shaft.
A compression coil spring 13 is provided to press the drum 2 toward the side plate 19 of the drum 20.

Cam followers 16a and 16b are connected to the shafts 17 and 18, respectively, as shown, and as the drum 2 rotates in the direction of the arrow, they come into contact with the corresponding cams 12a and 12b, thereby causing the shafts 17 and
18 by a certain angle. As the shafts 17 and 18 rotate, the claws 5 and 6
is designed to perform opening and closing operations.

The solenoid 15 is for moving the movable plate 14 for moving the cam 12 in the axial direction of the drum shaft 20. That is, the cam 12 is moved to the frame 21 side of the device and the cam followers 16a,
This is a mechanism for removing the document 1 from the document 16b, and is configured so that the drum 2 around which the document 1 is wound can rotate a set number of times without ejecting the document.

Next, the operation will be explained. Figures 4 and 5 are manuscript 1
This shows the operating status when the is installed. Here, claw 5 and claw 6
As shown in the figure, the cams 12a and 12b are rotated clockwise by tension coil springs 22 and 23, respectively, and the shapes of the cams 12a and 12b are formed as shown in the figure to match the opening and closing operations of the claws 5 and 6. Therefore, when the drum 2 rotates to the document device position, the pawl 5 is in a closed state as the cam follower 16a is removed from the cam 12a, and the pawl 6 is in a closed state as the cam follower 16b is pushed up by the cam 12b. It is in the open position. On the other hand, the document 1 is transferred to the paper feed roller 3 in FIG.
It is sent to the position of timing rollers 4a and 4b by a and 3b and once stopped. Then, when the claws 5 and 6, which are the document support portions of the drum 2, rotate to the predetermined positions, the waiting document 1 is sent out again at a speed faster than the rotation of the drum, and the claws 5 and guide 24 rotate. pushed between. Next, as shown in FIG. 5, the cam follower 16b is disengaged from the cam 12b, and the drum 2 rotates to a position where the claw 6 presses the leading edge of the document 1 against the claw 5 and supports the document 1 by the force of the tension coil spring 23. , the document 1 is clamped by the claws 5 and 6, and the mounting is completed.

Note that when the drum 2 starts to wrap the document 1, the driving to the timing roller 4b is stopped. This is because the document feeding speed of the timing roller is faster than the rotation of the drum. However, if left as is, the timing roller would become a brake, so in this embodiment, one-way clutches are attached to both ends of the timing roller 4b (not shown), and after stopping the drive to the timing roller, the drum 2 The timing roller 4a rotates idly (the timing roller 4a always rotates idly) due to the force that pulls the document 1. This completes the winding of the document 1 around the drum 2.

Both FIGS. 6 and 7 show the operating state when the original 1 is peeled and ejected, and the ejecting operation will be explained with reference to these figures. When the document support section with the claws 5 and 6 of the drum 2 approaches the document ejection position, the cam follower 16 first
a is pushed up by the cam 12a and the claw 5 opens.
When the claws 5 open, the claws 6 that have been pressing the document 1 against the claws 5 open outward by the force of the tension coil spring 23, and the clamping state between the claws 5 and 6 is released. At this time, nail 6
The leading edge of the document 1 is pushed up from the peripheral surface of the drum 2 to the outside of the paper discharge guide 9 to perform a reliable peeling operation.
That is, when the document support portion of the drum 2 passes the document discharge guide 9 at the document discharge position, the document discharge guide 9 and the claw 6
are attached at positions shifted from each other as shown in FIG. Only the paper ejection guide 9
As the drum 2 rotates, the paper is sequentially peeled off and discharged by the paper press rollers 11 (11a, 11b), the paper discharge guide 9, and the discharge rollers 8a, 8b shown in FIG. Then, the claws 5 and 6 are returned to the document standby state by the cam 12 before being rotated to the document loading position.

Regarding the shapes of the claws 5 and 6, a relief is provided in the claws 6 to prevent them from coming into contact with the paper discharge guide 9, as shown in FIG. Further, when the guide 24 and the claw 6 are opened inward in the document standby state (the state shown in FIG. 4), the claw 5 is attached to the guide 24 attached at the same position as the paper ejection guide 9 shown in FIG. A hole 26 is provided to prevent contact with.

In this way, the document 1 can be automatically loaded and ejected while the drum 2 is kept rotating in one direction.

FIG. 9 shows a method of loading the original 1 by stopping the rotation of the drum 2. First, the drum 2 is stopped at the original loading position, and the original 1 is moved between the claws 5 and the guide 24 by the timing rollers 4a and 4b. Push it in between. At this point, the timing rollers 4a and 4b hit the document 1 against the claw 5 and the paper feed guides 10a and 10b
Feed it out until there is slack in it and then stop.
This is because the claw 6 presses the leading edge of the document 1 against the claw 5.
At the position where it is supported by the force of the tension coil spring 23 (the fifth
(Condition shown in the figure) Even when the drum 2 rotates, the leading edge of the document 1 is always pressed against the claw 5. Therefore, even when the timing rollers 4a and 4b are stopped, the drum 2 can rotate to the position where the original 1 is supported and the original 1 can be loaded. After mounting, the document 1 is wound around the drum 2 as the drum 2 rotates. At this time, the timing roller is idly rotated by a one-way clutch, as in the case where a document is loaded while the drum is rotating. Another method of stopping the drum 2 and loading the original is to stop the drum 2 at the original loading position and then move the original 1 to the timing rollers 4a, 4b.
Push the original 1 between the claw 5 and the guide 24.
When the paper hits the claw 5 and becomes slack in the paper feed guides 10a, 10b (the state shown in FIG. 9), the drum 2 is rotated again. At this time, the timing roller is not stopped and the document is sent at the same speed as the rotation of the drum so that the document 1 is wound around the drum 2. This method eliminates the need to attach a one-way clutch to the timing roller and also simplifies control.

<Effects> As described above, the automatic sheet winding and discharging device of the present invention includes a rotating drum for winding the sheet,
A first pawl for positioning the leading edge of the sheet is provided on the circumferential surface of the drum so as to be movable in the circumferential direction of the drum; a second pawl that cooperates with the pawl to clamp the sheet, further cooperates with the first pawl when discharging the sheet to release the clamping state and peel the leading end of the attached sheet from the drum circumferential surface; a paper discharge guide member for guiding the sheet peeled from the drum by the second pawl to a discharge section; and a cam for appropriately operating the first and second pawls in accordance with rotation of the drum. Since it is equipped with means, it is possible to downsize the device by simplifying the structure, and it is also possible to automatically and reliably wind and discharge sheets even for sheets of different sizes, etc. It is possible to provide an extremely reliable automatic sheet winding and discharging device that is ideal for electronic devices such as electronic copying machines and facsimile machines.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram when the device of the present invention is applied to a document feeding device of a copying machine, Fig. 2 is a detailed view of the rotating drum, Fig. 3 is a sectional view of the rotating drum, and Figs. FIG. 5 is a diagram illustrating the operating state when a document is loaded, FIGS. 6 and 7 are diagrams illustrating the operating state when the document is peeled off and ejected, and FIG. 8 is a diagram showing the shape of the first claw. , FIG. 9 is a diagram illustrating the operating state when the drum is stopped and a document is loaded. 1: Document, 2: Drum, 3a, b: Paper feed roller, 4a, b: Timing roller, 5, 6: Claw,
7a, b: light source, 8a, b: ejection roller, 9: paper ejection guide, 10a, b: paper feed guide, 11a,
b: paper press roller, 12: cam, 13: compression coil spring, 14: movable plate, 15: solenoid, 16
a, b: cam follower, 19: side plate, 20: drum shaft, 21: frame, 22: tension coil spring A,
23: Tension coil spring B, 24: Guide, 25:
Stopper of claw 5, 26: escape hole of claw 6.

Claims (1)

[Scope of Claims] 1. A rotating drum for winding a sheet; a first pawl for positioning the leading edge of the sheet provided rotatably in the circumferential direction of the drum on the circumferential surface of the drum; The tip of the sheet positioned by the first pawl is held in cooperation with the first pawl, and further, when the sheet is ejected, the clamping state is released by cooperation with the first pawl, and the sheet is attached. a second pawl for peeling the leading end of the drum from the peripheral surface of the drum; a paper discharge guide member for guiding the sheet peeled from the drum by the second pawl to a discharge section; An automatic sheet winding and discharging device comprising: cam means for appropriately operating two pawls in response to rotation of the drum in one direction.