JPH06202302A - Diazo copying machine - Google Patents

Abstract

PURPOSE:To make always optimum development in prompt response with change in rotating speed of cylinder glass. CONSTITUTION:A sheet-like member 51 is tensely extended supporting with a roller (supporting member) 47, etc., and is partly wound around a developing drum 45. On the other hand, a motor 67 and a transmission means 60 which moves the roller 47 by transmitting the revolution of this motor 67 are provided. The motor 67 is driven according to the rotating speed of the cylinder glass 26 and the roller 47 is moved via the transmission means 60, thereby the range of winding the sheet-like member 51 round the developing drum 45 is changed and the time for heating photosensitive paper passing therebetween is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diazo copying machine for copying and exposing a document and a photosensitive paper which are superposed on each other and exposed.

[0002]

2. Description of the Related Art Conventionally, in this type of diazo copying machine, an original and a photosensitive paper are superposed on each other and wound around a cylinder glass, and the original is separated after being exposed by an internal light source while being conveyed by the rotation of the cylinder glass. Only the photosensitive paper is guided between the developing drum and the sheet-shaped member wound around the photosensitive drum, and is heated and developed by an internal heater while being conveyed by the rotation of the developing drum, and is discharged.

In such a conventional copying machine, when a long photosensitive paper sheet is used for recording, the photosensitive paper sheet may be wound around the cylinder glass and the developing drum at the same time and conveyed. If there is a difference in the transporting speed between the glass and the developing drum, the photosensitive paper is slackened or pulled, so that the transporting speeds of both are the same. On the other hand, when the original is exposed on the photosensitive paper, the rotation speed of the cylinder glass can be changed according to the transmittance of the original and the sensitivity of the photosensitive paper, for example, by manually switching to enable proper exposure. . Therefore, if the rotation speed of the cylinder glass is changed according to the transmittance of the original and the sensitivity of the photosensitive paper, the rotation speed of the developing drum also changes accordingly.

However, in such a copying machine, the amount of heat applied to the photosensitive paper at the time of development is set so that a constant amount of heat sufficient for development can be applied even at the maximum speed. Therefore, when the rotation speed of the cylinder glass is set low, an excessive amount of heat is added. And at slower speeds,
As shown in FIG. 6, the calorific value becomes an excessive calorific value of 30 mj / cm ² or more and destroys the surface layer of the diazo dye, resulting in a problem that the image density is lowered.

Therefore, in order to solve this, there has been a method in which a plurality of developing temperatures can be set stepwise and switched according to the rotation speed.

[0006]

However, in such a case, even if the developing temperature is switched depending on the rotation speed,
There is a problem that it takes time to reach the development temperature because the development temperature cannot be rapidly raised or lowered.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to respond to a change in the rotation speed of a cylinder glass so that optimum development can always be performed.

[0008]

Therefore, the present invention provides
For example, as shown in the following illustrated embodiment, the original P and the photosensitive paper S are superposed and wound around the cylinder glass 26, and the original P is exposed after being exposed by the internal light source 25 while being conveyed by the rotation of the cylinder glass 26. Separately, only the photosensitive paper S is guided between the developing drum 45 and the sheet-like member 51 wound around the developing drum 45, and while being conveyed by the rotation of the developing drum 45, it is heated and developed by the internal heater 52 and discharged. In the diazo copying machine, for example, the roller 47 of the sheet-like member 51 is used.
Alternatively, a support member such as the shaft 73 is moved to change the winding range of the sheet-like member 51 around the developing drum 45, while a motor 67 is driven according to the rotation speed of the cylinder glass 26. With the installation,
A transmission means 60 for transmitting the rotation of the actuator 67 to move the support member is provided.

[0009]

When copying, when the cylinder glass 26 rotates, the motor 67 is driven according to the rotation speed,
The rotation of the motor 67 is transmitted by the transmission means 60 to move the support member to change the winding range of the sheet-like member 51 around the developing drum 45.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an overall schematic configuration of a diazo copying machine which is an embodiment of the present invention.

Reference numeral 10 in the figure denotes the apparatus main body. As shown by the dotted line, this diazo copying machine is provided with a paper feed section A on the lower left side of the apparatus main body 10, an exposure section B on the right side of the paper feed section A, and a separation / transportation on the upper side of the exposure section B. The section C is provided, and the developing section D is provided above the separating / conveying section C.

The paper feed section A is provided with an original manual feed table 13 on the upper side, and a paper feed cassette 14 accommodating the photosensitive paper S is attached on the lower side thereof. Then, the table 1 for manual document feeding
3, the original P is inserted into the original conveying path 16 through the first feed roller pair 15 and 15 which are slightly separated from each other in advance, and when the detecting means 17 detects the original P, the original conveying path 16 is blocked. The retractable first stopper 18 is retracted, and the first feed roller pairs 15 and 15 are brought into pressure contact with each other so that the document P passes through the document transport path 16 and the merging / transport path 1 merges.
Transport to 9. At the same time, the paper feed roller 20 is rotated to send out the photosensitive paper S from the paper feed cassette 14, and the photosensitive paper S is conveyed to the merge conveyance path 19 through the photosensitive paper conveyance path 21 and the original P
Merge with and overlap. Then, the original P and the photosensitive paper S are brought into contact with the second stopper 23 which can be retracted through the pair of second feed rollers 22 and 22 which are separated from each other in the merging / conveying path 19 in advance, and the leading ends thereof are aligned. After that, the second stopper 23 is retracted, the second feed roller pairs 22 and 22 are brought into pressure contact with each other, and the stacked photosensitive paper S and original P are fed to the exposure section B.

The exposure section B is a light source 25 composed of a fluorescent lamp.
A transparent cylinder glass 26 containing therein is rotatably provided, and a driving roller 27 and a plurality of driven rollers 28 are arranged around the cylinder glass 26.
The endless belt 29 is stretched between 8 and a part of the endless belt 29 is pressed against the outer peripheral surface of the cylinder glass 26. Then, the photosensitive paper S and the original P are inserted between the cylinder glass 26 and the endless belt 29, and the photosensitive paper S is exposed by the light energy of the light source 25 while being sandwiched between them and conveyed to form a latent image. Then, the exposed photosensitive paper S and the original P are sent to the separation / conveyance unit C.

The separation / conveyance section C is provided with a pick-off plate 32 having one end pressed against the outer peripheral surface of the cylinder glass 26.
Further, a document suction means 34 and a photosensitive paper suction means 35 each having a suction fan (not shown) are provided on the left and right sides of the conveyance path 33 in the figure. The document adsorbing means 34 is configured such that a conveying belt 38 is stretched between a driving side conveying roller 36 and a driven side discharging roller 37. Then, the photosensitive paper S and the original P that have come out of the exposure section B are guided to the conveyance path 33 of the separation / conveyance section C by the pickoff plate 32. Then, the photosensitive paper S and the document P are sucked by the suction fans on both sides to separate them. Then, one of the separated originals P is ejected onto the original ejection tray 40 by the conveyance belt 38 and the original ejection rollers 39 pressed against it. The other photosensitive paper S is conveyed to the upper developing section D by the photosensitive paper conveyance roller 41 and the intermediate transfer roller pair 42.

In the developing section D, a developing drum 45 is arranged at the center, and both ends thereof are placed and supported on a roller-shaped heat-resistant rotating body 46 rotatably supported by left and right side plates (not shown). The driven rollers 47, 48, 49 and the driving roller 50, which are long, are arranged in this order in the rotation direction around the developing drum 45.
To place. Both ends of the rollers 47 to 50 are rotatably supported by the side plates. Then, between the rollers 47 to 50, the endless belt-shaped sheet-shaped member 5 is formed.
As shown in FIG. 1, both ends of the driven roller 48 are urged toward the opposite side of the roller 47 by the springs 48a, and a part of the sheet-like member 51 is partly developed. Wrap around the outer peripheral surface of. Further, as shown in FIG. 4, the developing drum 45 is provided with a heater 52 penetrating the center of the inside.

Then, the developing drum 45 is heated by the heater 52, the surface temperature is detected by the thermistor 53 pressed against the outer peripheral surface of the developing drum 45, and the safety means 54 keeps the surface temperature at an appropriate temperature. A driving force of a driving motor (not shown) is appropriately transmitted to rotate the driving roller 50, and the driving roller 50 rotationally drives the sheet-shaped member 51 to rotate the developing drum 45. Then, the photosensitive paper S fed from the separating / conveying section C is transferred to the developing drum 45 and the sheet-shaped member 5.
It is guided between 1 and sandwiched between them to be conveyed. then,
Heat is applied to the photosensitive paper S from the outer peripheral surface of the drum 50 by the heater 52 to develop the latent image. Then, the photosensitive paper S attached to the outer peripheral surface of the developing drum 45 is separated by the pick-off plate 55 and discharged onto the copy tray 57 by the pair of discharge rollers 56, 56, and the copying of the original P is completed.

By the way, in the diazo copying machine of the present invention, as shown in FIG. 1, transmission means 60 are provided at both ends of the driven roller 47.
Make up. That is, both ends of the driven roller 47 are supported by one end of each of the two L-shaped arms 61, 61. Both arms 61, 61 have a short shaft 62.
It is attached at 62 and is rotatable about it. Both of the arms 61, 61 have a gear portion 63.
63 are provided, and they are respectively engaged with the pinions 64. The pinions 64, 64 are fixed to both ends of a rotary shaft 65 provided in parallel with the driven roller 47. The one pinion 64 is provided with a coaxial and integral worm wheel 66. The worm wheel 66 meshes with a worm 68 provided on the motor shaft of a stepping motor 67. Also, the gear is placed at a position close to one gear portion 63.
A detection sensor 69 for detecting the rotational position of the frame 61 is provided.

When copying, for example, by manually inputting information, the cylinder glass 26 is considered in consideration of the rotational speed of the cylinder glass 26 from the product of the sensitivity and the transmittance of the photosensitive paper S.
Exposure is performed while rotating. Then, as shown in FIG. 2, the rotation speed of the cylinder glass 26 is detected by the rotation detecting means 71 such as a pulse generator or a tachogenerator, and the detection result is converted into time by the control means 72 to output the signal. Send to the stepping motor 67. Then,
The motor 67 is driven by the signal only for the time to transmit the transmission means 60.
The rotary shaft 65 is rotated from the worm 68 through the worm wheel 66, and the arm 61 is rotated through the meshing of the pinions 64 and 64 and the gear portions 63 and 63 at both ends thereof. Then, the driven roller 47 is moved in an arc shape indicated by an arrow centered on the short axis 62. Then, as shown in FIG. 3, the winding angle of the sheet-shaped member 51 with respect to the developing drum 45 is changed from θ ₁ to θ ₂ · θ ₃ · θ ₄ , and the winding range is changed.

Therefore, when the rotation speed of the cylinder glass 26 is high, the wrapping angle θ is increased and the photosensitive paper S conveyed by being sandwiched between the sheet-like member 51 and the developing drum 45.
When the heating speed of the cylinder glass 26 is long and the rotation speed of the cylinder glass 26 is slow, the winding angle θ is reduced and the heating time of the photosensitive paper S is shortened.

By the way, in the above-mentioned embodiment, the endless belt is used as the sheet-shaped member 51. However, as shown in FIG. 5, one sheet-shaped member 51 which is not endless may be used. That is, a part of the sheet-shaped member 51 is wound around the developing drum 45 in a predetermined range, and one end of the sheet-shaped member 51 is wound on the developing drum 4.
The shaft 73 is held by a shaft 73 parallel to the shaft 5, and both ends of the shaft 73 are supported by one end of the arm, as in the above-described embodiment. On the other hand, the other end is wrapped around a fixed shaft 74 provided between side plates (not shown), folded back, and pulled by a coil spring 75 to press the sheet-shaped member 51 against the developing drum 45.

The shaft 73 is moved in the direction of the arrow according to the rotation speed of the cylinder glass to change the winding angle θ, and the photosensitive paper S conveyed between the sheet-shaped member 51 and the developing drum 45 is moved. Increase or decrease the heating time.

[0022]

Therefore, according to the present invention, when copying, when the cylinder glass rotates, the motor is driven according to the rotation speed of the cylinder glass, and the rotation of the motor is transmitted by the transmission means. To move the sheet to the developing drum.
Since the winding range of the couch-shaped member is changed, the heating time is changed, and it is possible to quickly respond to the change in the rotation speed of the cylinder glass and always perform optimum development.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a diazo copying machine according to an embodiment of the present invention.

FIG. 2 is a block diagram of an electric system that changes the developing time.

FIG. 3 is an explanatory diagram showing a state in which the winding range of the sheet-shaped member changes.

FIG. 4 is an overall schematic configuration diagram showing an internal mechanism of the diazo copying machine of the present invention.

FIG. 5 is a schematic configuration diagram showing a wound state of the sheet-shaped member in another embodiment of the present invention.

FIG. 6 is a graph showing the relationship between the amount of heat applied during development and the image density in a diazo copying machine.

[Explanation of symbols]

 25 light source 26 cylinder glass 47 driven roller (supporting member) 51 sheet-like member 52 heater 60 transmission means 67 stepping motor (motor) 73 axis (supporting member) P document S photosensitive paper

Claims (1)

[Claims] 1. An original and a photosensitive paper are superposed and wound around a cylinder glass, exposed by an internal light source while being conveyed by the rotation of the cylinder glass, the original is separated, and only the photosensitive paper and a developing drum and In a diazo copying machine, which is guided between a wound sheet-shaped member and conveyed by the rotation of the developing drum, heated and developed by an internal heater and discharged, the supporting member of the sheet-shaped member is moved. Then, while the winding range of the sheet-like member around the developing drum is made variable, a motor is provided which is driven according to the rotation speed of the cylinder glass, and the rotation of the motor is transmitted to the motor. A diazo copying machine provided with transmission means for moving a supporting member.