JP2532862B2 - Transfer paper separating and conveying device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transfer sheet separating and conveying device of a copying machine.

(Prior Art) There is an opportunity to separate a thin paper with a separating claw when the paper is passed in the crosswise direction or when a face curl paper is passed such as double-sided copying.
In this case, even if the separation claw separates, the outer side of the separation claw is in close contact with the photoconductor, the both ends of the transfer paper tip are caught in the cleaning casing, the main motor cover, or the fixing cover, and both ends are broken. Or it jammed without being held in the fixing roller. When the cleaning casing is jammed and jammed, the drum does not stop immediately (time until the jam is detected). Therefore, the crumpled jammed paper often damages the drum. Further, although many occur when the cleaning device is attached and detached, the toner accumulated in the cleaning inlet seal drops downward. Therefore, there is a problem in that the transfer paper is soiled or the recharger or the conveyor belt is soiled and the back of the transfer paper is soiled.

(Objective) The present invention prevents the occurrence of jam of the transfer paper from the separating portion to the fixing so as not to damage the photoconductor drum even when using thin paper or face curl paper such as double-sided copy,
Another object is to prevent toner from falling off from the cleaning device to prevent image stains and back stains on the copy.

(Structure) In order to achieve the above object, the present invention provides a transfer paper separating / conveying device having a separating claw for separating the transfer paper adsorbed on the photosensitive drum, wherein the separating claws are provided on both sides in the transfer paper conveying direction. , A transfer paper conveyance guide member is disposed on the separation pawl operating shaft outside each separation pawl in the transfer paper conveyance path separated by the separation pawl, and the inner ends of the respective transfer paper conveyance guide members in the width direction are photosensitive drums. It is characterized in that it is brought closer to, and is gradually separated toward the outer end, and has a predetermined inclination downward.

Hereinafter, a specific description will be given based on the illustrated embodiment.
Reference numeral 1 is a photosensitive drum that rotates in the direction of the arrow, and a transfer / separation charger 2, a cleaning device 3,
A charge eliminating lamp 4, a charging charger 5, an eraser 6, a developing device 7, and a registration roller 8 for supplying transfer paper are arranged. 9 is a conveyor belt, 10 is a main motor cover,
11 is a fixing cover. Reference numeral 12 is a separation claw operating shaft, and two separation claws 13 and 14 are attached to the central portion at a constant interval.
Such a transfer paper separating / conveying device is conventionally known.

According to the present invention, in the above-mentioned apparatus, the transfer passage 16 below the cleaning device 3 for the transfer paper 15 separated by the separation claws 13 and 14.
The transfer paper conveying guide members 17 and 18 are fixed to the separation claw actuating shaft 12 outside the separation claws 13 and 14, and the inner ends 17a and 18a in the width direction thereof are brought close to the photosensitive drum 1, and the outer ends 17b and 18b. Predetermined slopes 17c and 18c are provided so as to gradually separate from each other. Reference numerals 17d and 18d are triangular or arc-shaped ribs formed along the traveling direction on the transfer paper 15 side. Separation claw holder 13a, 14a
Tapered surfaces 13b and 14b are also formed inside the tip.

 Next, the operation will be described.

The separation claws 13 and 14 are transfer papers 15 adsorbed on the photosensitive drum 1.
When the tip approaches, it comes into contact with the photosensitive drum by a spring (not shown) and slides with a width of several millimeters. Although the center of the transfer paper 15 is peeled off by the separation claws 13 and 14, both ends of the transfer paper 15 farther from the separation claws 13 and 14 are attracted to the photosensitive drum 1, so that the tip of the transfer paper 15 has a chevron shape. And proceed. The chevron portion follows the inclined portions 17c and 18c of the transfer paper transport guide members 17 and 18,
After being separated from the photoconductor drum 1, it becomes almost horizontal and is conveyed to the lower part of the cleaning device 3, the lower part of the main motor cover 10 and the fixing cover 11. In the image area of the transfer paper 15, even if it comes in contact with the transfer paper transport guide members 17 and 18, the rib 1
7d and 18d can minimize image drool.

Further, when the cleaning device 3 is attached or detached, the toner straddling the cleaning inlet seal 3a is dropped downward.

(Effect) According to the present invention, in a transfer paper separating / conveying device having a separation claw for separating the transfer paper adsorbed on the photosensitive drum,
Separation pawls are arranged on both sides in the transfer paper conveyance direction, and a transfer paper conveyance guide member is arranged on the separation pawl operation shaft outside each separation pawl in the transfer paper conveyance path separated by the separation pawls. The inner end of the conveyance guide member in the width direction is brought close to the photosensitive drum, and is gradually separated toward the outer end, and has a predetermined inclination downward, so thin paper or face curl paper such as double-sided copy is used. Even when the separation claws on both sides and the separation claw operating shaft are attached, the transfer paper leading edge can be conveyed to the fixing section in a nearly horizontal state, preventing the occurrence of jams and damaging the photoconductor drum. In addition, it is possible to prevent the toner from falling from the cleaning device and prevent the image from being smeared and the back of the copy to be smeared.

[Brief description of drawings]

FIG. 1 is an overall front view of a copying machine to which an embodiment of the present invention is applied, FIG. 2 is a front view of a separation claw and a transfer paper conveyance guide member of FIG. 1, and FIG. 3 is a separation claw of FIG. FIG. 1 ... Photosensitive drum, 2 ... Transfer / separation charger 3 ... Cleaning device, 12 ... Separation claw operating shaft 13,14 ... Separation claw, 15 ... Transfer paper 16 ... Conveyance passage, 17, 18 ... … Transfer paper transport guide members 17c, 18c …… Inclination

Continuation of the front page (56) Reference JP 58-97073 (JP, A) JP 59-187376 (JP, A) JP 58-72176 (JP, A) JP 55-111975 (JP , A) Actual opening 57-70254 (JP, U) Actual opening 55-95156 (JP, U)

Claims (1)

(57) [Claims] 1. A transfer paper separating / conveying device having separation claws for separating the transfer paper adsorbed on the photoconductor drum, wherein the separation claws are provided on both sides in the transfer paper conveying direction, and the transfer papers are separated by the separation claws. Transfer guide members for transfer are disposed on the separation claw actuating shafts outside the separation claws of the transfer passage, and the inner ends of the transfer paper transfer guide members in the width direction are brought close to the photosensitive drums.
A transfer paper separating / conveying device in which the transfer paper is gradually separated as it goes to the outer end portion and has a predetermined inclination downward.