JP3324488B2 - Automatic separation mechanism of diazo copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an automatic separating mechanism of a diazo copying machine for automatically separating a diazo photosensitive paper exposed in an exposure step from an original drawing.

[0002]

2. Description of the Related Art A diazo copying machine forms an image by utilizing the photosensitivity and coupling reactivity of a diazonium salt, and a single-color copy having a high positive contrast is directly obtained in two steps of exposure and heat development. Although it can be obtained, it has the advantages of low copy cost and easy handling.

In an exposure step in a diazo copying machine, an original drawing and a diazo photosensitive paper coated with a diazo photosensitive material are overlapped, and a contact transmission exposure is performed using the original drawing as a light source side. Then, the exposed diazo photosensitive paper is separated from the original drawing, conveyed to a developing process, and subjected to thermal development.
It is often done automatically by an automatic separation mechanism.

The automatic separation mechanism rotates at different peripheral speeds while contacting with each other, and holding a pair of offset rolls for moving the leading end of the diazo photosensitive paper supplied therebetween ahead of the leading end of the original drawing, and holding the leading end of the diazo photosensitive paper. And a stopper that stops and stops on the rotating separation plate.

[0005] The separation rotary plate is frictionally mounted on a rotating shaft that is constantly rotating, and when the stopper is engaged with the step portion of the separation rotary plate, the separation rotary plate stops, and the rotation shaft is rotated. It is spinning. When the leading edge of the diazo photosensitive paper that precedes the leading edge of the original drawing by the shifting roll enters the notch-shaped holding portion formed on the separation rotating plate, the leading end of the diazo photosensitive paper abuts against the stopper and rotates to separate. Release the lock with the rotating plate. Therefore, the separating rotary plate rotates integrally with the rotating shaft while holding the leading end of the diazo photosensitive paper by the frictional force between the separating rotary plate and the rotating shaft. As a result, the diazo photosensitive paper is separated from the original drawing, the diazo photosensitive paper is transported to the developing step, and the original drawing is discharged out of the copying machine. The disclosure of such an automatic separation mechanism includes, for example, JP-B-45-18-18.
436 publication.

[0006]

A conventional example of a structure in which a separation rotary plate is frictionally mounted on a rotary shaft will be described with reference to FIG. 8. The rotary shaft 4 is provided at a central opening 13 of the separation rotary plate 1. It has been inserted. A hole 14 is formed in the separation rotary plate 1 from its peripheral surface toward the central opening 13, and a screw groove is formed near the entrance of the hole 14 by a tapping process.
Then, by inserting the pressure contact 93 and the spring 92 into the hole 14 and screwing the set screw 91 into the screw groove of the hole 14, the pressure contact 93 is rotated by the resilient force of the spring 92 to the rotating shaft 4 which is constantly rotating. We are in pressure contact. Therefore, when the stopper 3 is locked on the step portion 12 of the separation rotary plate 1, the separation rotary plate 1 is stopped although the rotary shaft 4 is rotating, but the stopper 3 is rotated. When the engagement with the step portion 12 is released, the separation rotary plate 1 rotates integrally with the rotary shaft 4 due to the frictional force between the press contact 93 and the rotary shaft 4.

[0007] As described above, the conventional device has a large number of components and requires a tapping step because of the use of a set screw, a spring, a press contactor and the like. In addition, since these parts are very small, there is a problem that the assembling work is very time-consuming and these parts are easily lost.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic separating mechanism of a diazo copying machine in which the number of parts is small and a separating rotary plate can be frictionally mounted on a rotating shaft by a simple assembling operation. I do.

[0009]

In order to achieve the above object, the present invention relates to a method of superposing a diazo photosensitive paper on an original drawing and exposing the diazo photosensitive paper in an exposure step. When entering the notch-like holding part of the separation rotary plate, which is mounted on the shaft and the stopper is locked and stopped,
In the automatic separation mechanism of the diazo copier that releases the stopper and releases the diazo photosensitive paper from the original drawing by rotating the separation rotating plate and transports it to the development process, the rotating shaft is located on the side of the central opening of the separation rotating plate. Is formed, and a radially displaceable pressure contact is formed integrally with the cylindrical portion so that the pressure contact is pressed by the pressing means and pressed against the rotating shaft. The pressing means is, for example, an annular coil spring wound around the outer periphery of the cylindrical portion, or a C-shaped leaf spring inserted into the outer periphery of the cylindrical portion.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, a disk-shaped separation rotary plate 1 is formed of a synthetic resin having excellent wear resistance, for example, an acetal resin, and a cut-shaped holding portion 11 is formed on an outer periphery thereof. A step portion 12 is formed at a position substantially opposed to the step portion. The rotating shaft 4 is inserted through the central opening 13 of the separation rotating plate 1, and as described later,
The separation rotary plate 1 is frictionally mounted on the rotary shaft 4, and a cylindrical portion 2 through which the rotary shaft 4 is inserted is formed integrally with a side of the central opening 13.

A fixed shaft 5 is arranged in parallel with the rotating shaft 4, and a stopper 3 is rotatably supported on the fixed shaft 5. The stopper 3 has a bell-crank shape composed of two arms, and the tip of one arm is a locking portion 31 which is normally locked to the step 12 of the separation rotary plate 1 for separation. The rotating plate 1 is stopped. The tip of the other arm is an operating portion 32, which is located at the entrance of the holding portion 11 of the separation rotary plate 1. As shown in FIG. 3, a plurality of, for example, twelve sets of the separation rotary plate 1 and the stopper 3 are arranged along the rotary shaft 4 and the fixed shaft 5, and correspond to diazo photosensitive paper of various sizes. I can do it.

Below the separation rotary plate 1, there are arranged a pair of shift rolls 7 and 8 which are supplied with the diazo photosensitive paper S conveyed from the exposure step superimposed on the original O. The offset rolls 7 and 8 rotate while contacting each other at different peripheral speeds. That is, the peripheral speed of the roll 8 is slightly higher than the peripheral speed of the roll 7, and the leading end of the diazo photosensitive paper S contacting the roll 8 precedes the leading end of the original drawing O contacting the roll 7.

A cylindrical portion 2 formed integrally with a separation rotary plate 1
As shown in FIG. 4 and FIG. 5, a substantially U-shaped slit 23 cut out in the circumferential direction is formed. The tip of the portion surrounded by the U-shaped slit 23 is the pressure contact 21, and the portion connecting the pressure contact 21 and the cylindrical portion 2 is the displacement portion 22. That is, the press contact 21 is formed integrally with the cylindrical portion 2 via the displacement portion 22 which is a cantilever. As shown in FIG. 6, the displacement part 22 is formed to be thin, so that the press contact 21 can be easily displaced in the radial direction. Further, a protrusion 24 is formed adjacent to the press contact 21 so that a pressing means such as a coil spring 6 described later does not fall off the cylindrical portion 2.
As described above, since the press contact 21 is formed integrally with the cylindrical portion 2, the number of components is small, and a tapping process as in the related art is not required.

As the pressing means, as shown in FIG. 7, a coil spring 6 having both ends 61 and 62 connected to form an annular shape is used. That is, the annular coil spring 6 whose inner diameter in the natural state is smaller than the outer diameter of the cylindrical portion 2 is expanded and fitted into the outer periphery of the cylindrical portion 2. Therefore, the press contact 21 is pressed in the radial direction by the elastic force of the annular coil spring 6 acting in the direction of reducing the inner diameter. As a result, the pressure contact 21 is pressed against the rotating shaft 4, and the separation rotating plate 1 is frictionally mounted on the rotating shaft 4. As described above, the press contact 21 can be pressed against the rotary shaft 4 simply by inserting the annular coil spring 6 into the outer periphery of the cylindrical portion 2, so that the assembling work is extremely simple. The pressing force of the coil spring 6 must be sufficient to generate a frictional force that causes the separation rotary plate 1 to rotate integrally with the rotary shaft 4. However, if the pressing force is too large, the rotary shaft 4 will idle. Since the abrasion of the press contact 21 during the operation becomes large, it is necessary to set an appropriate pressing force. As the pressing means, for example, a C-shaped leaf spring (not shown) is used.
The pressure contact 21 may be pressed against the rotating shaft 4 by being fitted on the outer periphery of the shaft.

In FIG. 1 showing the state where the separation rotary plate 1 is stopped, when the diazo photosensitive paper S conveyed from the unillustrated exposure step and the original drawing O are supplied to the shift rolls 7 and 8, As described above, the leading end of the diazo photosensitive paper S precedes the leading end of the original drawing O, and the leading end of the diazo photosensitive paper S
Into the holding unit 11 of the first embodiment. At this time, the diazo photosensitive paper S
The tip of the stopper abuts on the operating portion 32 of the stopper 3 to rotate the stopper 3, and as shown in FIG. 2, the locking between the locking portion 31 of the stopper 3 and the step portion 12 of the separation rotary plate 1 is released. ,
The separation rotary plate 1 rotates integrally with the rotary shaft 4 while holding the leading end of the diazo photosensitive paper S by the frictional force generated by the pressure contact 21 pressing against the rotary shaft 4. Here, the peripheral speed of the separation rotary plate 1 is set slightly faster than the traveling speed of the diazo photosensitive paper S, and when the separation rotary plate 1 rotates about 180 °, the leading end of the diazo photosensitive paper S is moved forward by the separation. The rotating plate 1 comes out of the holding portion 11 and is transported by a roll (not shown) to a heat development process. Then, when the separation rotary plate 1 makes one rotation, the locking portion 31 of the stopper 3 is locked again to the step portion 12 of the separation rotary plate 1, and the separation rotary plate 1 stops and returns to the state shown in FIG. On the other hand, the original drawing O, which has been advanced more slowly than the diazo photosensitive paper S by the shift rolls 7 and 8, is separated from the diazo photosensitive paper S without being held by the holding portion 11 of the separation rotary plate 1, and is copied by a roll not shown. Emitted outside the machine.

[0016]

As described above, the automatic separating mechanism of the diazo copying machine of the present invention forms a cylindrical portion through which a rotating shaft is inserted beside a central opening of a separating rotary plate, and displaces in the radial direction. A possible pressure contact is formed integrally with the cylindrical portion, and the pressure contact is pressed by the pressing means so as to press against the rotating shaft, so that the pressure contact is inserted into the inner hole formed in the separation rotary plate as in the conventional case. There is an advantage that a small set screw, a spring, a pressure contactor and the like are not required, the number of parts is reduced, a tapping step is not required, and an assembling operation is extremely simple.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation state.

FIG. 3 is a plan view of the embodiment of the present invention.

FIG. 4 is a plan view of a cylindrical portion.

FIG. 5 is a side view of a cylindrical portion.

FIG. 6 is a sectional view taken along line AA of FIG. 4;

FIG. 7 is a sectional view of a main part of the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation rotary plate 11 Holding part 12 Step part 13 Central opening 2 Cylindrical part 21 Pressure contact 22 Displacement part 23 Slit 24 Projection part 3 Stopper 31 Locking part 32 Working part 4 Rotating shaft 5 Fixed shaft 6 Pressing means (spring) 7, 8 Shift roll

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-366830 (JP, A) JP-B-43-4145 (JP, B1) JP-B-49-9750 (JP, B1) (58) Field (Int.Cl. ⁷ , DB name) G03B 27/02-27/30

Claims (3)

(57) [Claims] After the diazo photosensitive paper is overlapped with the original drawing and exposed in an exposure step, the leading end of the diazo photosensitive paper is frictionally mounted on a rotating shaft, and a stopper is stopped by being locked and stopped. In the automatic separation mechanism of the diazo copying machine, when the stopper enters the notch-shaped holding portion of the plate, the stopper is released and the separation rotating plate rotates to separate the diazo photosensitive paper from the original drawing and transport it to the developing process. A cylindrical portion through which the rotating shaft is inserted is formed on the side of the central opening of the separation rotary plate, and a radially displaceable pressure contact is integrally formed with the cylindrical portion, and the pressure contact is pressed. An automatic separating mechanism of a diazo copying machine, which is pressed by a means and pressed against a rotating shaft. 2. The automatic separating mechanism of a diazo copying machine according to claim 1, wherein said pressing means is an annular coil spring wound around an outer periphery of said cylindrical portion. 3. The automatic separating mechanism of a diazo copying machine according to claim 1, wherein said pressing means is a C-shaped leaf spring fitted on the outer periphery of said cylindrical portion.