JPS60181759A - Recording apparatus - Google Patents

Abstract

PURPOSE:To prevent damage of a rotary drum by discovering possiblity o jamming of a recording medium in the early stage. CONSTITUTION:At the start of autoloading of a recording medium 6, a value obtained by adding 1sec to the standard time from the start of travelling of the medium 6 to the detection of the forward end of the medium 6 detected with a photodiode 15 is preset as a setting value to a counter circuit 17, and at the same time, JKFF18 is reset to start counting of the circuit 17. When autoloading of the medium 6 is not executed normally and jamming happens, since the forward end of the medium 6 is not detected with the diode 15, the circuit 17 produces a carry signal D, FF18 is set, and an alarm signal E is generated.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to an electronic device that has an autoload mechanism and performs recording on a continuous sheet-like recording medium that is placed on a recording medium running path by the autoload mechanism. The present invention relates to a recording device such as a photographic recording device or an electrostatic recording device.

(b) Background of the Technology FIG. 1 is a schematic diagram showing the configuration of an electrophotographic recording apparatus, in which 1 is a rotating drum whose cylindrical surface is coated with a photoreceptor as a toner image forming body, and 2 is a cylinder of the rotating drum 1. A charger 3 that imparts photosensitivity by charging the surface forms an electrostatic latent image by irradiating the cylindrical surface of the rotating drum l charged by the charger 2 with light modulated by recorded information. The exposure device 4 is connected to the rotating drum 1 by the exposure device 3.
5 is a transfer device that transfers the toner image formed on the rotating drum 1 onto a recording medium 6 by the transfer device 5. a fixing device that fixes the toner image transferred to the recording medium 6 by heating and melting it and fixing it to the recording medium 6;
3a, 8b, 8c, 8d, 8e and 8f constitute a recording medium conveyance system 8 for running the recording medium 6, and 8a,
8b and 8c constitute an autoload mechanism together with an autotable 9 described later.

8a is a tractor provided on the inlet side of the transfer device 5 on the running path of the recording medium 6 and drives the recording medium 6 by a sprocket, and 8b is the transfer device 5 on the running path of the recording medium 6.
The transfer device 5 is installed on the exit side of the transfer device 5, is mounted on an autoload table 9, which will be described later, and is driven by a tractor 8a.
8c is a pinch roller that presses the recording medium 6 against the scuff roller 8b; 8d is a pinch roller that is on the running path of the recording medium 6 after the pinch roller 8b; 8e is a scuff roller installed on the exit side of the fixing device 7 on the running path of the recording medium 6; 8f is a pinch that presses the recording medium 6 against the scuff roller 8e; A roller 9 is an autoload table for mounting the leading end of the recording medium 6 on the tractor 8a, and 10 and 11 are guides for guiding the recording medium 6 so that it travels along a normal travel path.

The recording medium 6 is usually a continuous sheet of recording paper that has sprocket holes on both sides in the running direction, has perforations for cutting at each leg, and is alternately folded along the perforations. Therefore, in addition to the above-mentioned components, it is provided with a hopper 12 for storing recording media 6 for supply and a stacker 13 for storing recording media 6 after recording.

(C) Prior Art and Problems The recording medium 6 is loaded by the autoload mechanism as follows.

i0 Manually remove the recording medium 6 from the hopper 12.1. Place the tip at a predetermined position on the autotable 9.

When the autoload switch (not shown) is turned i, the autoload table 9 rises to the position indicated by the dotted line in the figure and stops at the position where the sprocket hole of the recording medium 6 fits into the sprocket of the tractor 8a.

111, the tractor 8a, scuff roller 8b, pinch roller 8c, tractor scuff roller 8e, and pinch roller 8f are driven, and the recording medium 6 is transferred to the tractor 8a.
- It is guided to the stacker 13 through the scuff roller 8b, the pinch roller 8c, the tractor scuff roller 8e, and the pinch roller 8f.

1v, when the recording medium 6 is mounted in this manner, the recording medium conveyance system 8 is temporarily stopped, and thereafter the recording apparatus is operated in the recording mode.

Note that during operation in the recording mode, the scuff roller 8b and pinch roller 8c of the recording medium conveyance system 8 are not driven.

The area around the transfer device 5 is narrower than other parts of the travel path of the recording medium 6, and therefore a guide 10 and a guide 1 are provided in this area to facilitate the passage of the leading edge of the recording medium 6.
However, if the leading edge of the recording medium 6 is blocked by the guide 10 or 11,
Alternatively, the vehicle may deviate from the predetermined travel route. In such a state, the recording medium 6 is pushed unilaterally by the tractor 8a, resulting in a so-called jam. Conventionally, the recording medium transport system 8 is driven without being aware of this condition. Often continues.

As a result, the photoreceptor of the drum 1 that rotates once may be damaged.

(d) Purpose of the Invention The purpose of the present invention is to detect the possibility of jamming of a recording medium at an early stage in a recording device such as an electrophotographic recording device or an electrostatic recording device equipped with an autoload mechanism. The purpose is to prevent damage to the nine-rotation drum.

(e) Configuration of the invention, that is, the recording apparatus according to the present invention includes a toner image forming body that forms a toner image, a developing device that forms a toner image corresponding to recorded information on the toner image forming body, and a continuous A transfer device that transfers the toner image formed on the toner image forming body to a sheet-like recording medium, and a transfer device that is provided on the entrance side of the transfer device on the running path of the recording medium and drives the recording medium by a spray roller. In a recording apparatus including a tractor for running and an autoload table for mounting a leading end of the recording medium on the tractor, a detector for detecting that the leading end of the recording medium has passed the transfer device;
an alarm that generates an alarm signal if the passing of the leading end of the recording medium is not detected even after a preset time has elapsed after the tractor is started for autoloading and the recording medium starts running; It is equipped with a circuit.

(f) Examples of the invention Next, the gist of the present invention will be specifically explained using examples.

FIG. 2 is a configuration diagram of one embodiment of the present invention, in which the same reference numerals as in FIG. Configure a detector to detect that 10 has passed, and 1
4 is a light source, and 15 is a photodiode. Also 16 and 1
7 and 18 indicate that the recording medium 6 is not automatically loaded by the photodiode 5 even after a preset time has elapsed since the tractor 8a was started for autoloading and the recording medium 6 started traveling.
16 constitutes an alarm circuit that generates an alarm signal when the passage of the tip of the photodiode 15 is not detected, and 16 is an AND circuit that obtains an AND with the cutting edge signal B of the photodiode 15 to a signal indicating that autoloading is in progress. A predetermined setting value is preset by the autoload start signal C obtained when the tractor 8a is started for loading and the recording medium 6 starts traveling, and when the output of the AND circuit 16 is "'B", a count is performed and the count value is set. a preset counter circuit that generates a carry signal when exceeds the set value; 18;
JK is set by the carry signal of the counter circuit 17 and reset by the autorot start signal C.
It's a flip flop.

As described above, the recording medium 6 is taken out from the bossopa 12 by one hand, and the leading end is placed on the autoload table 9.
Autoloading is started by setting the autoloading switch to a predetermined position above and operating an autoload switch (not shown).

At this time, the set value is the standard time from when the tractor 8a is started and the recording medium 6 starts running for autoload until the leading edge of the recording medium 6 is detected by the photodiode 15 plus 1 second. The counter circuit 17 is preset, the JK flip-flop 18 is reset at the same time, and the counter circuit 17 starts counting.

If the autoload of recording medium 6 is performed normally,
After the autoload switch is operated, the leading edge of the recording medium 6 is detected by the photodiode 15 before the set value is reached, and the output signal of the AND circuit 16 becomes "0".
The counter circuit 17 stops counting before generating the carry signal, so the JK flip-flop 13 is not clocked and does not generate the alarm signal E.

If the autoloading of the recording medium 6 is not performed normally and a jam occurs, the leading edge of the recording medium 6 will not be detected by the photodiode 15 even after the set time has elapsed, and the counter circuit 17 will generate a carry signal.
JK flip-flop 18 is closed and alarm signal E is generated.

According to the above embodiment, when a jam occurs during autoloading, an alarm signal E is immediately generated, and therefore, this alarm signal E is used to stop the drive of the tractor 8a, etc. This can prevent damage to the product.

(g) Effects of the Invention As described above with reference to the embodiments, the present invention prevents jamming of a recording medium in a recording device such as an electrophotographic recording device or an electrostatic recording device equipped with an autoload mechanism. Immediate detection of the possibility can prevent damage to the single rotation drum.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the configuration of an electrophotographic recording device;
The figure is a configuration diagram of an embodiment of the present invention. In the figure, 1 is a rotating drum, 4 is a developer, 5 is a transfer device, 6 is a recording medium, 8a is a roller, 8b is a scuff roller, 9 is an autoload table, and 14 is a light source. Figure 1 8f Figure z

Claims (1)

[Claims] a toner image forming body for forming a toner image; a developing device for forming a toner image corresponding to recorded information on the toner image forming body; a transfer device that transfers the formed toner image;
A recording apparatus comprising: a tractor that is provided on the entrance side of the transfer device on a running path of the recording medium and drives the recording medium by a sprocket, and an autoload table that attaches a leading end of the recording medium to the tractor; a detector for detecting that the leading edge of the recording medium has passed the transfer device; and a detector for detecting that the leading edge of the recording medium has passed the transfer device; and a detector for detecting that the leading edge of the recording medium has passed the transfer device; and an alarm circuit that generates an alarm signal when the passage of the leading end of the recording medium is not detected.