JPH0334745Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a photosensitive paper detection device in a diazo copying machine.

(Prior Art) In a diazo copying machine, exposed photosensitive paper and original paper are passed between a pair of rollers that are given a difference in circumferential speed, thereby separating the two papers by shifting them from each other.
On the other hand, this type of diazo copying machine detects the length of the photosensitive paper and, for example, separates the developed photosensitive paper into large and small sizes and discharges and stores them in separate storage sections to facilitate handling of the photosensitive paper. ing.

When the leading edge of the photosensitive paper traveling toward this location is detected by an appropriate detection means, the pair of rollers is configured to start rotating by turning on a clutch or the like based on this detection signal. When detecting the length of photosensitive paper, the leading edge of the photosensitive paper is detected by some kind of detection means, and conventionally, these two types of detection have been performed by different means. As a result, there were drawbacks such as a complicated configuration and an increase in the number of parts.

(Purpose) The purpose of the present invention is to be able to obtain a drive start signal for a shifting device and a photosensitive paper leading edge detection signal for detecting photosensitive paper length using a single detection lever and a set of switch bodies. It is an object of the present invention to provide a photosensitive paper detection device having a simplified configuration.

(Structure) In order to achieve the above object, the present invention is equipped with a detection lever that can be rotated by a predetermined angle by the leading edge of the photosensitive paper advancing toward the shifting device, and one end of the detection lever is used for starting the drive of the shifting device. A first switch body for applying a signal is actuated, and the other end is a part for actuating a second switch body for applying a signal to detect the leading edge of the photosensitive paper in order to detect the length of the photosensitive paper. It is characterized by

The present invention will be explained below based on one embodiment.

In FIG. 1, when an original sheet 0 is inserted from the original sheet insertion slot 12 while aligning it with the original sheet tray 11 extending toward the front from the front of the copying machine 10, the original sheet feed roller pair 13 The insertion of the original paper is detected by the original paper detection device 15 disposed in the original paper passage 14, and based on the signal from the detection device 15, the lower part of the original paper tray is One sheet of photosensitive paper S stored in a stack is sent out by a paper feed roller 16.

The free ends 17a of the respective leading ends of the original paper and the photosensitive paper abut against a leading end aligning member 17 which is disposed so as to be movable forward and backward within the paper path, and the leading ends are aligned here. Immediately after the leading edges are aligned, the alignment member 17 rotates counterclockwise about the shaft 18 to open the passage between the original paper and the photosensitive paper, and at the same time, the presser roller 20, which had been separated upward from the feed roller 19, is moved. The overlapping original paper and photosensitive paper are pressed against a feed roller 19 and sent to an exposure section composed of an endless belt 21 and a transparent cylinder 22 for exposure.

As is well known, the transparent cylinder 22 is moved in the direction of arrow a by the above-mentioned endless belt 21 which is stretched around one belt drive roller 23 parallel to the transparent cylinder 22 and a plurality of guide rollers 24, 25, 26. It can be rotated.

The original paper O and the photosensitive paper S that have passed through the exposure section are sent out in a slack state onto a guide receiving plate 27 arranged at the exit of the exposure section, and are guided by this receiving plate.
It is fed into a shifting device 30 consisting of a pair of rollers 28 and 29, each rotating in the direction of the arrow. Of the pair of rollers, the roller 28 on the side that contacts the original paper has a circumferential speed that is approximately the same as the paper feed speed in the exposure section, and the other roller 29, that is, the roller on the side that makes contact with the photosensitive paper, has the paper feed speed in the exposure section. It is rotated at a circumferential speed somewhat higher than that of the In this way, the original paper and the photosensitive paper fed between the pair of rollers having a difference in circumferential speed advance with the leading edge of the photosensitive paper leading the leading edge of the original paper.

The leading edge of the preceding photosensitive paper is separated from the original paper by a separating rotary plate 31, and then separated by a roller 32,
Guide path 33, roller pair 34, swingable guide plate 35, roller 36, guide plate 37, roller 3
The photosensitive paper is sent to the developing section 39 via a roller pair 38 consisting of rollers 8a and 38b, and is developed there, then passes between a lower guide plate 40 and an upper guide section 41, and is disposed in the direction in which the photosensitive paper advances from the developing section. A pair of paper discharge rollers 42 discharge the paper onto a photosensitive paper holder 43 that accommodates relatively short photosensitive paper. On the other hand, the original paper separated from the photosensitive paper is discharged onto an original paper holder (not shown) by a pair of rollers 44.

The sensing device 47 is a feeler 4 consisting of a swinging lever whose free end is positioned in the paper path of the shifting device 30.
8, a feeler shaft 49, a detection lever 56 shown in FIG. 2 provided at one end of this shaft 49, and a micro switch 60 operated by one end 56b of this detection lever 56. Detection lever 5
Reference numeral 6 is provided with a spring 61 to provide a rotational behavior in the direction of pushing in the actuator 60a of the microswitch 60.

Here, in FIGS. 1 and 2, the leading edge of the photosensitive paper moving toward the shifting device 30 together with the original paper pushes up the feeler 48 and pushes up the detection lever 5.
6 by a predetermined angle in the direction of the arrow. Then, one end 56b of the detection lever 56 separates from the actuator 60a of the micro switch 60, and depending on the switching signal at this time, the shaft on the roller 29 that transmits rotation to the roller 29 of the shifting device 30 or cuts off the rotation. The upper clutch is turned on and the roller 29 begins to rotate, which causes the displacement separation described above.

The microswitch 60 constitutes a first switch body for applying a rotational drive signal to the shifting device 30, and one end 56b of the detection lever 56 serves as a part for actuating the first switch body.

Photosensitive paper holder 43 of photosensitive paper discharge roller pair 42
On the other side, there is a shaft 51 parallel to the paper ejection roller pair 42.
A photosensitive paper path switching member 52 fixed to is disposed. Both ends of the shaft 51 are rotatably supported by an immovable member such as a side plate of the copying machine, and an arm 53 is fixed to one end of the shaft 51, as shown in FIG. The free end of arm 53 is connected to solenoid 54 by spring 55.
are connected via.

As shown in FIG. 1, the path switching member 52 has a first position in which its lower end 52a is located above the nip of the paper ejection roller pair 42, and a first position in which the lower end is located below the nip as shown by a broken line 52A. When placed in the first position, the photosensitive paper discharged by the paper discharge roller pair 42 passes below the path switching member 52. When the paper advances toward the photosensitive paper holder 43 and is placed in the second position, the copying machine is guided by the curved inner surface 52b of the path switching member 52 to be reversed in an upward and backward diagonal direction; The paper is ejected toward the rear of the copying machine while being guided by the top surface of the copying machine. The photosensitive paper discharged in this direction is a relatively large photosensitive paper as will be described later, and is discharged from the upper surface of the developing unit lid 94 toward the back passage 87 or the back of the copying machine.

Whether the path switching member 52 is placed in the first position or the second position is determined by the length of the photosensitive paper used. For example, when A-row 2-size or B-row 3-size photosensitive paper according to the JIS standard is inserted horizontally into a copying machine, the path switching member 52 occupies the first position; If the photosensitive paper is used in portrait orientation, it occupies the second position. Here, lateral orientation means that the length of the photosensitive paper in the direction perpendicular to the feeding direction is longer than the length parallel to the feeding direction.

The length of the photosensitive paper used is detected by a photosensitive paper length detection device, and if the length of the photosensitive paper exceeds a predetermined length, the length of the photosensitive paper used is determined based on the signal from the detection device as shown in Figure 3. The solenoid 54 shown in FIG. 1 operates to switch the path switching member 52 from the first position to the second position. In this way, the solenoid 54, spring 55, arm 53, etc. constitute a course switching member driving device for switching the course switching member 52 to the second position.

The length detection device is placed so that the leading edge of the photosensitive paper reaches the pair of paper ejection rollers 42 by the time it finishes detecting the predetermined length of the photosensitive paper, for example, the horizontal length of A-column 2-size paper.
Any location that cannot be reached is sufficient. In other words,
If the length of the A-row 2-size horizontal paper or more is detected,
It is sufficient to activate the solenoid 54 immediately.

A photosensitive paper detection signal for actuating the solenoid 54 can be obtained by movement of a detection device 47 provided in the shifting device.

The other end 56a of the detection lever 56 provided on the feeler shaft 49 described above constitutes an optical path opening/closing part that can freely enter and exit the optical path of a photo interrupter 59, which is composed of a light emitting element 57 such as a light emitting diode and a light receiving element 58 such as a photocell. However, by pushing the feeler 48 around at the leading edge of the photosensitive paper and/or the original paper, the optical path which is normally blocked is opened. The leading edge of the photosensitive paper is detected by the opening/closing operation of the optical path by the detection lever 56, and the length of the photosensitive paper is measured based on this detection signal and a pulse signal from the pulse generator 63 (FIG. 4). As shown in FIG. 4, the pulse generator 63 includes a light emitting element 64, a light receiving element 65, an optical path opening/closing plate 66 having a large number of equally spaced notches on the periphery, a chain 67 for driving this opening/closing plate 66, and a sprocket 68. The chain 67 is connected to a suitable rotating shaft of the copying machine, for example, a shaft that frictionally drives the separating plate 31 (FIG. 1). By rotating the opening/closing plate 66, the optical path O is opened and closed, and a pulse signal is generated from the light receiving element 65.

FIG. 5 shows an example of a control circuit for a photosensitive paper path switching device including a photosensitive paper length detection device. In the figure, when the feeler 48 (FIG. 2) is pushed up by the tip of the photosensitive paper and the detection lever 56 is rotated in the direction of the arrow, the optical path of the photo interrupter 59 is opened and a signal is output from the light receiving element 58. This photosensitive paper detection signal passes through a waveform shaping circuit 70 and an AND circuit 7.
1, the AND circuit 71 goes high (H), and the inverter 72 goes from H to low (L), thereby setting the binary counter 73. Since the output from counter 73 is L, inverter 74 remains at H level. The pulse signal from the pulse generator 63 is
It is input to the counter 73 through AND circuits 75 and 76. Here, the counter 73 is a preset counter that is preset by the BCD code 77. The counter starts counting based on the detection of the leading edge of the photosensitive paper, and when the count value reaches the preset value, the AND circuit 78 changes from L to H, actuating the solenoid drive circuit 79 to drive the solenoid 54, Photosensitive paper path switching member 52
(Figs. 1 and 3) is changed from the first position to the second position.

At the same time as the solenoid drive circuit 79 operates,
Since inverter 74 changes from H to L, AND
The input of the pulse signal to the counter 73 is blocked by the circuit 76, and by holding the output of the counter 73, the output of the AND circuit 78 is also held in the H state.

When the rear end of the photosensitive paper passes the feeler 48 (FIGS. 1 and 2) and the signal from the light receiving element 58 stops,
The AND circuit 71 becomes L, and the clear terminal CLR of the counter 73 becomes H via the inverter 72, so the counter 73 becomes a reset state, the counter output also becomes L, and the output from the AND circuit 78 disappears, and the solenoid drive circuit is also inactive.

When the value of the binary counter 73 is less than or equal to the preset value, the counter output remains at L and is reset again.

FIG. 6 shows a timing chart of the photosensitive paper path switching device, and FIG. 7 shows a state in which A-row 2 size and A-row 1 size photosensitive paper are placed at the paper feeding position. In both figures, when the length T1 (for example, the length of A1) of the photosensitive paper detection signal by the light receiving element 58 exceeds the predetermined length T2, the leading edge of the photosensitive paper is detected and then the photosensitive paper is detected at the predetermined length T2. When this is reached, the output from the counter activates the solenoid drive circuit. Photosensitive paper detection signal length T4 (e.g. A2 length)
is shorter than the predetermined length T2, the solenoid drive circuit will not operate. Here, the given length
T2 corresponds to the preset value described above.

As described above, the photo interrupter 59 shown in FIG. 2 connects a first switch body such as the microswitch 60 to a second switch body that detects the leading edge of the photosensitive paper in order to detect the length of the photosensitive paper. configure,
Further, the other end 56a of the detection lever 56 serves as a part for operating the second switch body.

The detection lever 56 achieves the function of simultaneously operating both the first and second switch bodies, and each switch body is actuated by a separate detection lever. In comparison, it is possible to simplify the configuration and reduce the number of parts.

(Effects) As described above, the present invention includes a detection lever that is rotated by a predetermined angle by the leading edge of the photosensitive paper advancing toward the shifting device, and one end of the detection lever is used to apply a signal to start driving the shifting device. The first switch body is actuated, and the other end is used as a part to actuate a second switch body for applying a signal to detect the leading edge of the photosensitive paper in order to detect the length of the photosensitive paper. Therefore, a single detection lever is required as a photosensitive paper detection device for obtaining both of the above-mentioned signals, which is useful for simplifying the configuration and reducing the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a diazo copying machine to which the present invention is applied, Fig. 2 is a perspective view showing the leading edge detection mechanism of photosensitive paper and original paper, and Fig. 3 is a perspective view of the drive unit of the photosensitive paper path switching member. 4 is a perspective view showing an example of a pulse generator, FIG. 5 is a diagram showing an example of a control circuit of a photosensitive paper path switching device including a photosensitive paper length detection device, and FIG. 6 is a diagram showing an example of a control circuit for a photosensitive paper path switching device. FIG. 7 is a timing chart of the apparatus showing a state in which two sizes of photosensitive paper, large and small, are placed at the paper feeding position. 30... Shifting device, 56... Detection lever, 56b
...One end, 56a...Other end, 59...Photo interrupter, 60...Micro switch.

Claims (1)

[Claims for Utility Model Registration] 1. Pass exposed photosensitive paper and original paper between a pair of rollers that are given a difference in circumferential speed, shift and separate the two papers from each other, and detect the length of the photosensitive paper. In order to achieve this, the diazo copying machine detects the leading edge of the photosensitive paper advancing towards the shifting device consisting of the pair of rollers, comprising a detection lever that is rotated by a predetermined angle by the leading edge of the advancing photosensitive paper, One end of this detection lever serves as a part for operating a first switch body for applying a rotational drive signal to the shifting device, and the other end serves as a part for operating a second switch body for detecting the leading edge of the photosensitive paper. A photosensitive paper detection device characterized by comprising a part that causes 2. The photosensitive paper detection device according to claim 1, wherein the second switch body is a photo interrupter, and the other end of the detection lever is an opening/closing portion of the optical path of the photo interrupter.