JPH02204268A - image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image forming apparatus.

[Prior Art] Conventionally, an image forming apparatus using a long sheet of paper as an image forming medium or an intermediate medium is known.

[Problem to be solved by the invention]

Conventionally, among image forming apparatuses that have a mechanism for conveying and winding up a long sheet of paper, none has a means for detecting whether the winding shaft is rotating or not. An abnormality occurs in the gear, belt, etc.), and the transport unit (mechanism that feeds the paper) operates.
If only the winding section was stopped, this could not be detected.

Therefore, if the apparatus continues to be driven in this state, the long sheet of paper will sag between the conveying section and the winding section. Therefore, the slack may wrap around the conveyance roller, resulting in a jam. Moreover, this jam cannot be cleared simply by pulling it out either from the transport section or from the take-up section. This requires processing such as taking out the rollers that are present, which cannot be handled by general users.

The present invention has been made in order to solve the above-mentioned problems, and detects an abnormality in the operation of the winding section at an early stage, stops the operation of the device before the jam occurs, and as a result, the The purpose is to prevent jams from occurring and provide a device that users can use with peace of mind.

[Means for Solving the Problems] In order to achieve this object, the image forming apparatus of the present invention includes a first sheet conveying means for sending out a long sheet of paper, and a first sheet conveying means for sending out a long sheet of paper, and a first sheet conveying means for sending out the long sheet of paper, The apparatus includes a second sheet conveyance means for drawing in a length of paper, and a detection means for detecting an abnormality in the operation of the second sheet conveyance means.

[Function] According to the image forming apparatus of the present invention having the above configuration, abnormal operation of the winding means can be detected early by the detection means, so the operation of the apparatus can be stopped before the slack becomes large and a jam occurs. can be done.

[Embodiment] Hereinafter, a description will be given with reference to FIG. 1, which shows a schematic configuration of an embodiment of a photosensitive and pressure-sensitive copying machine that is capable of full-color copying according to the present invention.

The photosensitive pressure-sensitive copying machine 1 of this embodiment uses photosensitive paper consisting of a photosensitive pressure-sensitive sheet (microcapsule sheet) and a color developer sheet. A movable document table glass 2 and document table cover 3 are provided on the top plate of the copying machine 1, and a desired document 4 is set face down on the document table glass 2.

A light source using a halogen lamp 5 or the like is installed in the upper part of the copying machine 1. Light is emitted in a line through a slit hole provided on the top surface of the machine toward the document table glass 2, and the light is emitted from the halogen lamp 5. The fallen light passes through the transparent document table glass 2 and is reflected by the document 4 placed thereon.

Therefore, exposure scanning of the original 4 is performed by moving the original platen glass 2. The light reflected from the original 4 passes through a filter 6 for adjusting the color tone of the copied image and enters a projection lens 7, and the direction of the light projected by this lens 7 is changed by a pair of reflection mirrors 8 and 9. , an image is formed on the microcapsule sheet 11 located along the exposure table 10. The reflecting mirrors 8 and 9 are mounted on a mirror mounting plate, and the optical path length and focus are adjusted by finely adjusting the mounting position of the mirror mounting plate.

On the other hand, the elongated microcapsule sheet 11 is housed in a removable cartridge wound around a cartridge shaft 12, and its lower end is connected to a number of rollers 14g, 14b, and 14c to avoid slack. A dancer roller 14f for absorption, a pressure developing device 13, and a separation mechanism 14
d and reaches the winding shaft 15. That is, the microcapsule sheet 11 coming out from the lower part of the cartridge is guided by a feed roller 14a and a guide roller 14b, passes below the exposure table IO, and then passes through a conveyance roller 14C and a dancer roller 14f to a pressure developing device. 13 and further passed through this pressure developing device 13, the microcapsule sheet 11 is transferred to a separation mechanism 14d and a feed roller 1.
4e, and then wound onto the winding shaft 15. Note that the unexposed microcapsule sheet 11 after leaving the cartridge is maintained in an unexposed state by the light shielding cover.

In addition, the transport speed of the microcapsule paper 11 is controlled to be constant and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 11 contains the document when passing through the exposure table 10. Latent images of predetermined lines are sequentially formed.

Further, a reflective optical sensor is attached near the winding shaft 15 to detect the rotational state.

A paper feed cassette 17 containing a color developer sheet (recording paper) 16 constituting a paper feed device is installed below the pressure developing device 13, and a suction cup type paper feeder that sucks paper using negative pressure suction is installed. A mechanism 18 is provided, and the developer sheets 16 are taken out one by one by the paper feed mechanism 1B and sent to a feed roller 19.
a, the sheet is conveyed by the pinch roller 19b, and after the leading end is aligned by the color developing sheet rollers 19c, 19d and the resist gate 19e, the sheet is conveyed into the pressure developing device 13. In this way, the microcapsule sheet 11 and the color developer sheet 16 are supplied to the pressure developing device 13 in a state in which they are in close contact with each other and are integrated, and the surface of the microcapsules on which the latent image of the microcapsule sheet 11 is formed and the color developer sheet 16. The color developer-coated surface of the roller is sandwiched between the small-diameter roller 13a and the backup roller 13b while being in contact with each other on the inside, and pressure is applied thereto. This pressure destroys the unexposed microcapsules and forms an image on the color developing sheet 16.

Microcapsule sheet 11 coming out of pressure developing device 13
After the color developer sheet 16 is separated by the separation mechanism 14d, the color developer sheet 16 is transferred to the heat roller 2 of the heat fixing device 20.
After the color development is promoted by 0a and an image is formed, the sheet is conveyed to the sheet discharge tray 21 by the sheet discharge roller. Note that the separated microcapsule paper 11 is wound up on a winding shaft 15 via a feed roller 14e.

Incidentally, among the rollers in contact with the microcapsule paper, those upstream from the pressure developing device 13 are driven by a single motor, and constitute the first conveying means A. Further, those downstream from the pressure developing device 13 are driven by a single motor, and constitute a second conveying means B.

Next, means for detecting the rotational state of the winding shaft 15 will be explained in detail with reference to FIGS. 2 and 3.

The winding shaft 15 is attached to a removable flange 30. Also, a gear 32a is attached to the chassis 31 from an external drive source.

Power is transmitted to the gear 33 via the gear 32b, and the winding shaft 15 is rotationally driven. Then, on the outside of the flange 30, a black and white pattern is displayed on the circumference,
A reflective optical sensor 34 is attached to the chassis 31 to read the pattern.

Therefore, as the flange 30 rotates with the winding shaft 15, the black and white pattern can be read by the reflective optical sensor 34, so it can be determined whether or not the winding shaft 15 is rotating. When the shaft 15 must be rotating, that is, when each member corresponding to the first sheet conveying means A is rotating, if the winding shaft 15 is not rotating, a message to that effect will be displayed on a display (not shown). is displayed and further stops the operation of the device. Although a reflective optical sensor was used in the above embodiment, any sensor configuration may be used, such as a transmissive optical sensor or a magnetic sensor, as long as it can detect the rotation of the rotation axis. do not have.

Further, in the above embodiment, the rotation of the rotation shaft is directly detected. However, by detecting the secondary development that occurs when the winding shaft is not rotating, It is also possible to detect that the shaft is not rotating, and details of this will be described below as a second embodiment.

By arranging the tension sensor 41 between the winding shaft 15 and the feed roller 14e as shown in FIG.
Sagging of the microcapsule sheet 11 when the rotation of the winding shaft 15 is stopped can be detected. For other configurations, please refer to the first
This is similar to the embodiment.

Furthermore, the configurations shown in FIGS. 5 and 6 are also conceivable. This will be explained as a third embodiment.

FIG. 5 shows the feed roller 1 in the schematic configuration diagram of FIG.
A tension sensor 40 for detecting the tension state of the microcapsule sheet 11 is added in front of the microcapsule sheet 4e. FIG. 6(a) shows the sagging state of the microcapsule sheet 11 that occurs because the winding shaft is not rotating. Here, the state when the feed roller 14e is released is shown in FIG. 6cb>. As is clear from the figure, the microcapsule sheet 1 generated in Figure 6(a)
1 is transmitted downward by releasing the feed roller 14e, and the tension sensor 40 becomes unable to detect the tension. Thereby, abnormal rotation of the winding shaft 15 can be indirectly known. In this color copying machine, the feed roller 14e is opened for about 1 second after the start of pressure development. Note that the feed roller 14
Regarding the opening/closing mechanism of e, since no special mechanism is required, it will be omitted here.

Note that in this case, the feed roller 14e corresponds to the second conveyance means.

Although the above embodiments have been described regarding the abnormal operation of the winding shaft, it will be explained next that the present invention is not limited to the winding shaft, but can always be applied to paper conveyance.

FIG. 7 is a diagram showing the first embodiment in a paper conveyance state, and includes a conveyance roller 50 for sending out the paper, and a conveyance roller for drawing in the paper sent out from the roller and sending it out to the next process. 51, and a conveying roller 5
1 is equipped with a sensor 52 for detecting the rotational state of the conveyance roller 51.

Furthermore, FIG. 8 shows a case where a tension sensor 53 is arranged between the conveying rollers 50 and 51 instead of the sensor 52, and this corresponds to the second embodiment.

FIG. 9 shows a case in which a conveyance roller 54 is further added behind the conveyance roller 51 in FIG.
By opening the conveyance roller 51, it becomes possible to detect the rotational state of the conveyance roller 54. This is the third
This corresponds to the embodiment of .

Note that the function of opening and closing the conveying roller 51 may be necessary for handling paper jams, etc., and in such cases, the embodiment shown in FIG. 9 is particularly effective.

Further, the sensor 53 is not limited to the space between the transport rollers 50 and 51, but may be located between the transport rollers 54 and 51. Further, the conveyance roller 51 is released to transmit the slack state of the paper to the left and right, and what is required is to eliminate or reduce the force holding the paper. In other words, a state of no inertia (so-called free state)
It's okay to become

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, since the present invention includes a detection means for detecting abnormal rotation of the winding shaft, if the winding shaft rotates due to some reason. Even if this is not the case, paper jams will not occur due to sagging and can be dealt with at an early stage.

[Brief explanation of the drawing]

1 to 9 show one embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a color copying machine according to the first embodiment, and FIG.
The figure is a perspective view of the vicinity of the winding shaft in the same embodiment.
The figure is a side view of the space, FIG. 4 is a configuration diagram showing the main parts of the second embodiment, FIG. 5 is a schematic configuration diagram of the third embodiment, and FIG. 6 is the detection operation in the same embodiment. FIG. 7 is a schematic configuration diagram in which the first embodiment is applied to a general paper conveyance system, and FIG. 8 is a schematic configuration diagram in which the second embodiment is applied to a general paper conveyance system. , FIG. 9 is a schematic configuration diagram in which the third embodiment is applied to a general paper conveyance system. In the figure, A is the first conveyance means in the first and second embodiments, B is the second conveyance means in the same embodiments, and 14e is a feed roller corresponding to the second conveyance means in the third embodiment. , 33 and 34 are flanges and reflective optical sensors that constitute the detection means in the first embodiment, 40 is a tension sensor that constitutes the detection means in the third embodiment, and 41
is a tension sensor constituting the detection means in the second embodiment. 11th! l Figure 2 Figure 3 Figure 4 q Figure 6 (a) (b) Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. A first sheet conveyance means for sending out a long sheet; and a second sheet conveyance means for drawing in the long sheet sent out to the first sheet conveyance means. An image forming apparatus comprising: a detecting means for detecting an abnormality in the operation of the second sheet conveying means.