JP3579579B2 - Copier - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diazo type copying machine.
[0002]
[Prior art]
2. Description of the Related Art A diazo copying machine performs a copying operation by applying the photodecomposition characteristic of a diazo compound. In other words, the photosensitive paper coated with the diazo compound is brought into close contact with a translucent original such as tracing paper, and the original image is transferred to the photosensitive paper by exposing such photosensitive paper through the original. The transferred image is developed by heating and developing the photosensitive paper. Therefore, in a diazo copying machine, an exposure unit and a development unit are provided in the paper guide path, and the photosensitive paper is transported together with the original to the exposure unit, and after exposure, only the photosensitive paper is transported to the development unit. It has become.
[0003]
Here, paying attention to the developing unit, there is a developing unit having a structure in which a flexible sheet member is pressed against a rotatable developing drum having a built-in heater. In such a structure, the photosensitive paper is guided to the developing drum, and the photosensitive paper is brought into close contact with the developing drum by a sheet-shaped member. Thus, the photosensitive paper is heated by the developing drum heated by the heater, and the image transferred to the transfer paper develops color.
[0004]
[Problems to be solved by the invention]
In a developing section having a structure in which a flexible sheet-shaped member is pressed against the periphery of the developing drum, the sheet-shaped member must be able to freely contact and separate from the developing drum in order to release a paper jam around the developing drum. Therefore, in the developing unit having such a structure, the guide unit that is rotatable in the direction of contact and separation with respect to the developing drum holds the sheet-shaped member, and the guide unit is rotated to a normal position where the sheet-shaped member is pressed against the developing drum. Are locked by a lock mechanism.
[0005]
However, in the developing unit having such a structure, there is a case where the guide unit is forgotten to be locked after the paper jam processing or the like. In such a case, if the copying operation is performed as it is, the paper jam occurs again, which is inconvenient. .
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a copier which can always lock the guide unit when performing a copying operation, even if the guide unit for pressing the flexible sheet member against the developing drum is forgotten to be locked. Is to get.
[0007]
Another object of the present invention is to provide a copying machine which does not cause unnecessary vibration in the main body case.
[0008]
Yet another object of the invention is to ensure the locked state of the guide unit.
[0009]
[Means for Solving the Problems]
In the copying machine according to the first aspect of the present invention, the image of the original is transferred to the thermal paper by exposing the photosensitive paper which is in close contact with the original via the original, and the thermal paper after the transfer is brought into close contact with the heated developing drum. In a copying machine designed to develop a transferred image, a cover provided to be openable and closable in the vicinity of a developing drum in a main body case accommodating respective parts, and a flexible sheet-like member for adhering thermal paper to the developing drum And a guide unit that rotatably supports the flexible sheet member around the developing drum so as to come into contact with and separate from the developing drum, and a guide unit that rotates to a normal position where the sheet-like member is pressed against the developing drum. A lock mechanism that clamps the guide unit in accordance with the rotation of the guide unit, and a lock mechanism that is provided inside the cover. It includes a pressing portion for pressing to the position. Therefore, when the cover is closed, the guide unit is pressed by the pressing portion until the sheet-shaped member is positioned at the proper position, and even when the guide unit is forgotten to be locked, the guide unit is always locked during the copying operation. Will be maintained.
[0010]
According to a second aspect of the present invention, in the copying machine of the first aspect, the pressing portion is formed to protrude inside the cover. Therefore, the contact area between the cover and the guide unit is small, and the vibration generated by the rotation of the developing drum is not easily transmitted to the cover.
[0011]
According to a third aspect of the present invention, in the copying machine according to the second aspect, the pressing portion is provided at a position corresponding to the lock mechanism. Therefore, the guide unit is reliably pressed by the pressing portion to the position where it is clamped by the lock mechanism, and the locked state of the guide unit is ensured.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. The present embodiment relates to a diazo type copying machine.
[0013]
FIG. 1 is an overall perspective view. The copying machine 1 of the present embodiment has an upper cover 3 as a cover above the main body case 2 so as to be openable and closable. A paper feed tray 4 that is maintained in a substantially horizontal state is provided below the front surface of the main body case 2, and a photosensitive paper (not shown) is also placed at a position in contact with the paper feed tray 4 of the main body case 2 together with a document (not shown). A paper feed port 5 for feeding paper and a document discharge port 6 for discharging a document are provided. Two photosensitive paper discharge ports 7a and 7b for discharging photosensitive paper are provided on the upper surface of the main body case 2, and one of the photosensitive paper discharge ports 7a supports the discharged photosensitive paper. Support 8 is provided. Further, an operation panel 9 including a display unit is provided on one side of the upper surface of the main body case 2.
[0014]
2 to 4 are longitudinal side views. Inside the main body case 2, an exposure unit 11 and a development unit 12 are sequentially arranged along a paper guide path 10. The exposure unit 11 includes a rotatable cylinder glass 14 having two exposure tubes 13 built therein, and a belt 15 for closely guiding the original and the photosensitive paper superposed around the cylinder glass 14. The belt 15 is wound around a part of the cylinder glass 14 while being stretched between a plurality of rollers 16, and is driven to rotate by the rotation of the rollers 16. The paper guide path 10 has a structure in which the photosensitive paper and the document that are superimposed and fed from the paper feed port 5 are first guided and conveyed to such an exposure unit 11. In the paper guide path 10, a separation mechanism (not shown) is provided for separating the photosensitive paper and the document that have passed the exposure unit 11, and the separation mechanism separates the photosensitive paper from the document. Each unit is configured to be guided and conveyed toward the discharge port 6 and to convey the separated photosensitive paper toward the developing unit 12.
[0015]
The developing unit 12 to which the separated photosensitive paper is transported is constituted by a rotatable developing drum 18 having a built-in halogen heater 17 and a guide unit 19 for closely guiding the photosensitive paper around the developing drum 18. . Further, the guide portion 19 includes a first roller 20a, a second roller 20b, and a third roller 20c, and a first guide unit 21a and a second roller 20b disposed between the first roller 20a and the second roller 20b. And a second guide unit 21b disposed between the third roller 20c. The first, second, and third rollers 20 a, 20 b, and 20 c are roller-shaped members that press against the developing drum 18. Each of the first and second guide units 21a and 21b is formed by attaching a flexible sheet member 24 to a frame 23 supported by a support shaft 22 so as to be in contact with and away from the developing drum 18. The first and second guide units 21a and 21b are locked by the lock mechanism 25 at a position where the sheet-like member 24 made of a Teflon sheet is rotated until the sheet-like member 24 comes into close contact with the developing drum 18. Such a lock mechanism 25 is rotatable by a pair of two pairs of pins 26 protruding from both frames (not shown) of the main body case 2 and first and second guide units 21a and 21b for clamping these pins 26. , And a clamp claw 27 provided at the bottom. The clamp claw 27 is rotatably supported by a support shaft 28 erected on the first and second guide units 21a and 21b, and is urged in a direction of clamping the pin 26 by an urging member (not shown). The first and second guide units 21a and 21b are provided with an inclined portion 29 that rides on the pin 26 as the developer unit 18 approaches the developing drum 18 (see FIG. 3). The clamp claw 27 is formed integrally with the lock release lever 30, and is configured to rotate in a direction opposite to the biasing direction and come off the pin 26 by operating the lock release lever 30.
[0016]
FIG. 5 is a perspective view of the upper cover 3. The upper cover 3 is formed with two pairs of pressing portions 31 protruding on both sides of the inner surface. As shown in FIG. 2, these pressing portions 31 move the first and second guide units 21 a until the sheet-like member 24 is located at a regular position where the sheet-like member 24 is in close contact with the developing drum 18 with the upper cover 3 closed. , 21b. Further, each pressing portion 31 is positioned at a position corresponding to each lock mechanism 25.
[0017]
The paper guide path 10 has a structure in which the photosensitive paper developed by the developing unit 12 is conveyed toward one of the photosensitive paper outlets 7a and 7b. A discharge roller 32 for discharging the photosensitive paper sent from the printer is provided.
[0018]
In such a configuration, in order to execute a copying operation, photosensitive paper is superimposed on a document and fed from the paper feed port 5. In this case, a photosensitive paper coated with a diazo compound is used, and a document is translucent such as tracing paper. The photosensitive paper and the document fed to the paper feed port 5 are guided along a paper guide path 10 to reach an exposure unit 11, where the photosensitive paper and the original are wound around a cylinder glass 14 by a belt 15 at the exposure unit 11, and the rotation operation of the cylinder glass 14 is performed. Transported in accordance with At this time, the photosensitive paper comes into close contact with the cylinder glass 14 via the document. Thereby, the photosensitive paper is exposed by the irradiation light from the exposure tube 13 built in the cylinder glass 14, and the image of the original is transferred to the photosensitive paper. In this way, the photosensitive paper having passed through the exposure unit 11 and the document are separated by a separation mechanism (not shown), and the document is discharged from the document discharge port 6 as it is. On the other hand, the photosensitive paper is guided to the developing unit 12 by the paper guide path 10. In the developing unit 12, the photosensitive paper is wound around the developing drum 18 by the first roller 20a, the first guide unit 21a, the second roller 20b, the second guide unit 21b, and the third roller 20c. Conveyed according to rotation. At this time, the photosensitive paper is brought into close contact with the developing drum 18 heated by the halogen heater 17 by the sheet-like member 24 pressed against the developing drum 18, and is developed by receiving the heat. That is, the transferred image is colored. Thus, the original image is copied. The developed photosensitive paper is selectively conveyed along the paper guide path 10 to one of the photosensitive paper outlets 7a and 7b, and is discharged to one of the photosensitive paper outlets 7a and 7b.
[0019]
Here, in the vicinity of the developing drum 18, the photosensitive paper may adhere to the heated developing drum 18 excessively or curl upward, thereby causing a paper jam. Therefore, in this case, the upper cover 3 is opened and the paper jam is cleared. FIG. 3 is a vertical sectional side view showing a state in which the clamp of the second guide unit 21b by the lock mechanism 25 is released, and FIG. 4 is a vertical sectional side view showing a state in which the second guide unit 21b is pivotally opened for paper jam processing. is there. That is, in order to perform the jam processing, after the upper cover 3 is opened, the lock release lever 30 of the desired guide unit 21 is operated to release the clamp of the clamp claw 27 to the pin 26, and the guide unit 21 is moved to the developing drum. The developing drum 18 is exposed by rotating in a direction away from the developing drum 18. As a result, paper jam processing can be performed. Then, when resetting the apparatus, the guide unit 21 is rotated in a direction approaching the developing drum 18 until the clamp claw 27 is clamped on the pin 26, and the upper cover 3 is closed. Thus, the apparatus is reset in a state where the sheet member 24 is pressed against the developing drum 18, and the copying operation is enabled.
[0020]
On the other hand, when the apparatus is reset after the paper jam has been cleared, the guide unit 21 may be forgotten to be clamped. In the copying machine 1 of the present embodiment, even in such a case, the guide unit 21 can be reliably clamped only by closing the upper cover 3. That is, if the guide unit 21 is in a state as shown in FIG. 3, more specifically, in a state in which the inclined portion 29 of the clamp claw 27 is placed on the pin 26, the upper cover 3 is closed, and The protruding pressing portion 31 presses the frame 23 of the guide unit 21 to clamp the clamp claw 27 to the pin 26. As a result, when the upper cover 3 is closed, the two guide units 21a and 21b are correctly clamped as shown in FIG. 2, and the sheet member 24 is positioned at a proper position where the sheet member 24 is pressed against the developing drum 18. As a result, inconveniences such as the occurrence of paper jam due to the guide unit 21 not being clamped correctly are reliably prevented. Moreover, since the pressing portion 31 is formed to protrude inside the upper cover 3, the contact area between the upper cover 3 and the guide unit 21 is small, and the vibration generated by the rotation of the developing drum 18 is not easily transmitted to the upper cover 3. Therefore, generation of vibration and noise is prevented. Further, since each pressing portion 31 is disposed at a position corresponding to each lock mechanism 25, the guide unit 21 is reliably pressed to a position where it is clamped by the lock mechanism 25. Therefore, the locked state of the guide unit 21 is ensured.
[0021]
Note that, in the embodiment, the pressing portion 31 may not be formed to protrude from the inner surface of the upper cover 3.
[0022]
【The invention's effect】
According to the first aspect of the present invention, since the pressing portion that presses the guide unit is provided inside the cover until the sheet-shaped member is positioned at the proper position where the sheet-shaped member is pressed against the developing drum with the cover closed, the cover is closed. This allows the guide unit to be pressed by the pressing portion until the sheet-like member is positioned at the proper position.Therefore, even if the guide unit is forgotten to be locked, the guide unit must be locked during the copying operation. Can be maintained. Therefore, it is possible to reliably prevent the paper jam when the copying operation is performed when the guide unit is forgotten to be locked.
[0023]
According to a second aspect of the present invention, in the copying machine according to the first aspect, since the pressing portion is formed to protrude inside the cover, a contact area between the cover and the guide unit can be reduced. This makes it difficult for the vibration generated by the vibration to be transmitted to the cover, thereby preventing the generation of vibration and noise.
[0024]
According to a third aspect of the present invention, in the copying machine according to the second aspect, since the pressing portion is provided at a position corresponding to the lock mechanism, the guide unit is reliably pressed by the pressing portion to a position where the guide unit is clamped by the lock mechanism. Therefore, the locked state of the guide unit can be ensured.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional side view thereof.
FIG. 3 is a vertical sectional side view showing a state in which a clamp of a guide unit by a lock mechanism is released.
FIG. 4 is a longitudinal sectional side view showing a state where a guide unit is rotated for paper jam processing.
FIG. 5 is a perspective view of a cover.
[Explanation of symbols]
2 Body case 4 Cover (upper cover)
18 Developing drum 24 Sheet member 21 Guide unit 25 Lock mechanism 31 Pressing part

Claims (3)

The image of the original is transferred to the thermal paper by exposing a photosensitive paper that is in close contact with the original via the original, and the transferred image is developed by bringing the transferred thermal paper into close contact with a heated developing drum. Copier,
A cover provided to be freely opened and closed in the vicinity of the developing drum in a main body case storing each part,
A guide unit that holds a flexible sheet member for bringing the thermal paper into close contact with the developing drum and that is rotatably supported to press the flexible sheet member around the developing drum so that the flexible sheet member can come and go. ,
A lock mechanism for clamping the guide unit, which has been rotated to a normal position where the sheet-shaped member is pressed against the developing drum, in accordance with the rotation of the guide unit,
A pressing portion provided inside the cover, and pressing the guide unit in a state where the cover is closed until the sheet-shaped member is located at a regular position,
A copying machine comprising: 2. The copying machine according to claim 1, wherein the pressing portion is formed to protrude inside the cover. 3. The copying machine according to claim 2, wherein the pressing portion is provided at a position corresponding to the lock mechanism.

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