JPS60262757A - Jam detecting apparatus - Google Patents

Abstract

PURPOSE:To facilitate the transaction for jamming by installing sensors, etc. for detecting the jam of copying paper into the divided units for a plurality of works which form a transfer passage, thus facilitating the discrimination of the unit in which jam is generated. CONSTITUTION:The transfer passage for a copying paper 5 is constituted of a plurality of units, namely a paper feeding unit 1, copying paper unit 2, transfer unit 3, and a fixation unit 4. In this case, the sensors 1S-4S for detecting the jam of the copying paper are arranged in the units 1-4, respectively. The units 1-4 are installed onto the apparatus body 6 in demountable ways through handle parts 15-45. Each of the handle parts 15-45 is made of transparent or semitransparent synthetic-resin plates, etc., and lamps 1L-4L operated by the outputs of the sensors 1S-4S are arranged inside the units 1-4. Therefore, the unit in which jam of the copying paper 5 is generated can be easily confirmed, and the proper transaction is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a jam detection device for detecting the occurrence of a jam in a recording material in an image forming apparatus such as a copying machine or an inkjet printer.

(Prior Art) In a conventional image forming apparatus of this kind, a sensor for detecting the conveyed recording material is disposed near the conveyance path of the recording material, and the jam of the recording material is detected based on the sensor output. An occurrence is detected. In the jam occurrence position display section formed on the console panel or the back surface of the document cover, a portion corresponding to the jam occurrence position emits light, thereby allowing the operator to know the jam occurrence and its occurrence position.

Here, in some image forming apparatuses, the conveyance path of the recording material is constituted by a plurality of units, and each unit is configured to be individually attachable to and detachable from the apparatus main body. In such a device, when a jam is detected as described above,
By removing the unit corresponding to the position where the jam occurred from the main body of the apparatus and removing the recording member jammed therein, recovery work against the occurrence of the jam can be easily performed.

(Problem to be Solved by the Invention) However, as described above, the jam occurrence display is not displayed at the location where the jam actually occurred, so the operator cannot display the jam occurrence position display section 2. There is a problem in that an inexperienced operator has to search for the actual location of the jam by referring to the location, and it takes time for an inexperienced operator to find the location.

Furthermore, during continuous copying, etc., there are multiple recording materials in the transport path, so if the jam occurs in the wrong location, the recording material that was being transported normally will be removed.
There has been a problem in that recovery work against the occurrence of jam cannot be performed accurately.

(Means and effects for solving the problems) An object of the present invention is to solve the problems of the prior art. For this purpose, in the jam detection device according to the present invention, the conveyance path of the recording material is composed of a plurality of division units, each division unit is detachably disposed with respect to the main body of the image forming apparatus, and the conveyance path of the recording material is In an image forming apparatus in which each step of image formation is performed on a recording material, each division unit has a detection unit that detects the occurrence of a jam of the recording material within a conveyance path formed by the division unit. and a display means whose blinking is controlled by the detection output of the detection means,
The display device is characterized in that the display means is disposed on a handle provided on each of the division units for attaching and detaching each of the division units to and from the main body of the image forming apparatus.

In an image forming apparatus to which a jam detection device having such a configuration is applied, when a jam occurs, a display means disposed on the unit handle at the location where the jam occurs indicates that the jam has occurred. Therefore, the operator only has to take out the unit and remove the recording material inside it.

(Example) The present invention will be described in detail below with reference to the drawings.

The drawing shows an embodiment of an electrophotographic copying machine to which the present invention is applied. As shown in the figure, in this example there are four units 1.2.
3.4 constitutes a conveyance path for the transfer paper 5. That is, the unit 1 is a paper feed tray unit, and includes a tray 5Δ that stores transfer paper 5, and a paper feed roller I2 that sequentially feeds the transfer paper 5 one by one from the top layer toward the unit 2.
has. Unit 2 is a transfer unit and includes a pair of registration rollers 21 and a transfer charger 22. here,
The transfer charger 22 is disposed at a position facing the outer circumferential surface of the photosensitive drum 7 rotatably supported by the apparatus main body 6, and the transfer portion 12 is formed between them.

A photosensitive layer is formed on the outer peripheral surface of the photosensitive drum 7.

As the drum 7 rotates, an exposure area 8 is formed on the outer peripheral surface.
, the reflected light image of the original 10 scanned by the optical system 9 is exposed to form an electrostatic latent image. This electrostatic latent image is visualized as a toner image in the developing section 11.

The transfer paper 5 fed from the unit 1 is conveyed by a pair of registration rollers 21 in the unit 2 so that its leading edge coincides with the toner image on the photosensitive drum 7 at the transfer section 12 . In the transfer section 12 , the toner image is transferred onto the transfer paper 5 by the transfer charger 22 . After the transfer is completed, transfer paper 5
is separated from the photosensitive drum 7 and conveyed to the unit 3.

The unit 3 is a transport unit, which has a transport belt 31 stretched between rollers, and transports the transfer paper 5 on which transfer has been completed toward the unit 4. The unit 4 is a fixing unit, and has a fixing section 41 consisting of a pair of fixing rollers, and a pair of discharge rollers 42. In the fixing section 41, the toner image on the transfer paper 5 is fixed to the surface of the transfer paper, and after the fixing is completed, the discharge roller The paper is discharged to the discharge tray 13 by the pair 42 .

On the other hand, in each unit 1 to 4 constituting the conveyance path in this way, there are sensors IS to 4 for detecting a jam of transfer paper.
S is arranged. Further, each unit is detachably attached to the device main body 6, and handles 15 to 45 for attaching and detaching the units are provided on the main body of each unit. Each of these handle portions 15 to 45 is formed from a transparent or translucent synthetic resin plate, etc., and is connected to the sensor IS to 4S.
There are built-in lamps IL to 4L whose blinking is controlled based on the output of .

In this example, when jam occurrence is detected by each sensor IS-4S, each corresponding lamp IL-4L is
is controlled so that it blinks, and the blinking stops when the recovery work for the jam is completed and things return to normal again. Such control can be easily performed by known microcomputer control.

In this embodiment configured as described above, when a jam occurs on the transfer paper 5 in the middle of the conveyance path during a copying operation, it is detected by each of the sensors IS to 4S, and the corresponding lamps IL to 4L blink. For example, when a jam occurs in the conveyance unit 3, it is detected by the sensor 3S, and the lamp 3L in the handle part 35 starts blinking. Therefore, the operator only has to take out the unit 3, remove the transfer paper therein, and then attach the unit 3 to the main body 6 of the apparatus again.

(Effects of the Invention) As explained above, according to the present invention, a jam occurrence indicating means such as a lamp is disposed on the handle of each of the plurality of units constituting the conveyance path for recording materials such as transfer paper. The unit in which the jam has occurred can be directly recognized by visual inspection, and the recovery work against the occurrence of the jam can be easily and accurately performed.

[Brief explanation of the drawing]

The drawing is a schematic configuration diagram showing an example of a copying machine to which the present invention is applied. 1.2.3.4 - Unit, Is, 2S, 3S. 4S...Sensor, LL, 2L, 3L, 4L...Lamp, 15.25.35.45...Handle. Patent applicant Fuji Xerox Co., Ltd.

Claims (1)

[Claims] The conveyance path of the recording material is composed of a plurality of partition units,
In an image forming apparatus, each section unit is removably disposed with respect to an image forming apparatus main body, and each section is configured to perform image forming steps on a recording material conveyed through the conveyance path. The unit includes a detection means for detecting the occurrence of a jam of the recording material in the conveyance path formed by the partitioning unit, and a display means for controlling the drive based on the detection output of the detection means. A jam detection device characterized in that the jam detection device is disposed on a handle provided on each of the division units for attaching and detaching each of the division units to and from an image forming apparatus main body.