JPH0367390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field of the Invention> The present invention relates to an improvement in an automatic sheet winding and discharging device capable of automatically winding and discharging sheets such as paper and film around a rotating drum.

<Prior Art> The above-described automatic sheet winding and discharging device is used, for example, as an automatic document paper feeding and discharging device in facsimile machines, electronic copying machines, and the like.

Generally, in this type of apparatus, unless the drum diameter is changed, sheets of longer than a certain length cannot be used. However, if a sheet of more than the specified length is accidentally wrapped around the drum, the sheet will be wrapped twice around the drum, making it impossible to perform the specified ejection operation even if an ejection signal is issued. There was a problem.

<Objects> The present invention has been made in view of the problems of the conventional art, and its objects are to provide a means for detecting the length of a sheet, and a means for detecting the length of a sheet when the length of the sheet is equal to or greater than a predetermined length. By being equipped with a sheet ejecting means that ejects the sheet without wrapping it around the drum, even if a sheet of a predetermined length or more is accidentally inserted, the sheet is ejected immediately without being wrapped twice around the drum, thereby preventing any malfunction. The present invention aims to provide an automatic winding and discharging device.

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

FIG. 1 is a schematic configuration diagram when an 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, 3a and 3b are paper feed rollers, e is a passage, 4a and 4b are timing rollers, 10a,
10b is a paper feed guide, 11a and 11b are drums 2
Paper pressing rollers 7a and 7b are light source lamps for exposure, and shafts 17 and 18 are attached to the drum periphery to hold the leading edge of the original 1. A claw that can be opened and closed freely, 9
8a and 8b are paper ejection guides, and ejection rollers 8a and 8b.

Further, s ₁ and s ₂ are document detection sensors installed to detect the length of the document, and sensor s ₁ is in the path e, and sensor s ₂ is in the timing roller 4.
The sensors s 1 and s 2 are respectively installed between the sensors a and 4b and the paper press roller 11b, and the distance l ₁ between the two sensors s ₁ and s ₂ is set as follows. That is, usually this distance
_l1 is set to be less than or equal to the circumferential length of the drum 2 minus the rotational circumferential length necessary for paper ejection operation. In this case, the paper ejecting operation is performed within the same rotation period as the paper feeding operation.

Regarding the above distance l ₁ , the point is that the drum 2
It is sufficient if it is less than the maximum perimeter of , but if the distance l ₁
When set to be slightly shorter than the circumferential length, the paper ejecting operation is performed in the next rotation cycle after the paper feeding operation.

FIGS. 2 and 3 are diagrams showing the structure of the drum 2 and its surroundings, and to explain a little based on these figures, the claws 5 and 6 are connected to the shaft 1 supported by the side plate 19.
7, attached to the shaft 18; On the other hand, a cam 12 (12
a, 12b) and a compression coil spring 13 for pressing the cam 12 toward the side plate 19 of the drum 2.
is provided.

Cam followers 16a and 16b are respectively connected to the shafts 17 and 18 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 is formed to be rotated by a certain angle. As the shafts 17 and 18 rotate, the claws 5 and 6 open and close.

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.

The detailed structure and operation of this device for wrapping and discharging original documents are disclosed in the previously filed Japanese Patent Application No. 75543/1986.
Since it is explained in the previous issue, a detailed explanation will be omitted here.

FIG. 4 is a diagram showing a schematic configuration of the control circuit.
Various sensors such as document detection sensors s ₁ and s ₂ and various actuators such as a solenoid 15 are connected to the CPU 22 via an interface 25 . Further, connected to this CPU 22 are a ROM 23 that stores control programs, etc., and a RAM 24 that is used as a working memory.

FIG. 5 is a control flow diagram, and the operation will be explained based on this diagram.

First, when the original 1 is inserted, it is determined whether the original detection sensor s ₁ in the path e is operating (a,
b) If the sensor _s1 is operating, then the operating state of another document detection sensor _s2 disposed between the timing rollers 4a, 4b and the paper pressing roller 11b is determined (c). When the sensor s ₂ is activated, the process proceeds to step d, where it is determined whether both the sensors s ₁ and s ₂ are activated, that is, whether they are both detecting a document, and it is determined whether both sensors s 1 and s 2 are detecting the document. After waiting for a certain period of time, the operating states of both sensors s ₁ and s ₂ are judged again (e, f). If both sensors s ₁ and s ₂ are still operating, that is, if they have detected a document, the CPU 22 outputs a document discharge signal and drives the solenoid 15 for a certain period of time (g,
h) The document inserted within the same period of the drum 2 is discharged.

In this way, when the document 1 is fed by the paper feed rollers 3a, 3b and the timing rollers 4a, 4b, it is determined whether the length of the document 1 is longer than a predetermined length or not depending on the document detection state by the sensor _s1 and the sensor _s2 . It will be judged whether or not. In other words, if only sensor _s2 is activated (step d), document 1 of less than the specified length
If the sensor s ₁ and s ₂ are both activated, it detects whether the state continues for a certain period of time, and if the state does not change for a certain period of time, it performs normal operation. Manuscript over the specified length 1
The paper is ejected immediately after determining that the paper has been inserted.

In this way, even if a document longer than a predetermined length is inserted, the document can be immediately ejected without being wrapped twice around the drum.

<Effects> As described above in detail, the automatic sheet winding and discharging device according to the present invention includes a sheet length detection means provided in the sheet passage section between the sheet insertion section and the drum, and a sheet length detection means provided in the sheet passage section between the sheet insertion section and the drum. Based on the signal from the length detection means, it is determined whether the length of the inserted sheet is at least a predetermined length set to be less than or equal to the maximum circumference of the drum, and if the length is greater than or equal to the predetermined length; and a sheet discharging means for discharging the sheet without doubly wrapping the sheet around the drum,
Even if a sheet of a predetermined length or more is accidentally inserted, it is immediately ejected without being wrapped twice around the drum, making it possible to prevent malfunctions in the ejecting operation.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram when the device of the present invention is used in 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 drum, and Fig. 4 is a control circuit. FIG. 5 is a control operation flow diagram. 1 is a document, 2 is a drum, 3a and 3b are paper feed rollers, 4a and 4b are timing rollers, e is a passage, and s ₁ and s ₂ are document detection sensors.

Claims (1)

[Scope of Claims] 1. In an automatic sheet winding and discharging device capable of automatically winding and discharging a sheet around a drum, the sheet is provided in a sheet passage section between a sheet insertion section and a drum. Length detection means; Based on the signal from the sheet length detection means, it is determined whether the length of the inserted sheet is at least a predetermined length set to be less than or equal to the maximum circumference of the drum. An automatic sheet winding and discharge device comprising: a sheet discharge means for discharging the sheet without doubly wrapping the sheet around a drum when the length is longer than a predetermined length.