JPS602547A - Paper skew correcting device - Google Patents

Abstract

PURPOSE:To enhance the function of correcting the skew of a paper, by providing such an arrangement that a conveying means on the side where the front end of the paper transferred in a skew condition at first reaches a gate is deenergized while the front end of the paper which comes in a delay is advanced. CONSTITUTION:When a sensor 4 detects the front end of the preceding side of a paper 9 which is transferred in a skew condition on a paper conveying path just before the paper 9 reaching a gate, a solenoid 5 on this preceding side is operated in accordance with a detection signal from the sensor 4 to lift up a slip roll 6 from a drive roll and as well a clutch for the drive roll is disengaged to release the nip force of the slip roll 6 so that conveying force for the preceding side is eliminated to damp a shock upon touching between the front end of the preceding side of the paper 9 and the gate, thereby the damage of the paper is remarkably reduced. During this stage, the front end of the retarding side of the paper is turned to the direction of the arrow B under conveying force by the slip roll 6 and a drive roll to correct the skew of the paper 9.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a paper skew correction device for a copying machine or the like.

(Prior Art) A conventional device for correcting the skew of paper of this type includes a plurality of gates at appropriate locations in the paper conveyance path, and a conveyance force resistor on both ends of the conveyance path in front of the gates. A pair of upper and lower slip rolls with a weak nip force against the paper are respectively arranged, and among the leading edges of the paper passing diagonally through the slip rolls, the leading edge of the paper collides with the paper first due to the diagonal movement and advances. While the roll on the side that is blocked is slipping, the paper is rotated in front of the gate using the conveying force of the roll on the side where progress is delayed, thereby correcting the skew.

However, the paper skew correction device with such a configuration,
Conveying force remains on the roll on the side where the leading edge of the paper hits the gate and slips, and in the case of oblique feeding, the leading edge of the paper hits the gate at a single point, so the leading edge may be bent or It had the disadvantage of being susceptible to damage such as curling.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the above-mentioned conventional paper skew correction device. are provided relatively to each other on both ends of the conveying path, and sensors for detecting paper are placed on the outside in front of the gate, and conveying force is intermittently generated on the same line in front of the cage in the conveying direction. The leading edge of the sheet that has been conveyed diagonally through the sheet conveying path first reaches the gate to cut off the conveying force, and To provide a paper skew correction device which improves skew correction capability by advancing the leading edge of a conveyed paper, and also significantly reduces paper damage when the paper contacts a gate. With the goal.

(Structure of the Invention) The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a plan view showing one embodiment of the paper skew correction device of the present invention, and FIG. 2 is a side view of the conveying means section of the same.

Install the gate 1.1 on the shaft 2 at the appropriate location on both ends of the paper conveyance path.
Place it using And on one end side or both ends of the shaft is a goo 1 which opens and closes the gate 1.1 by rotating it.
Install Lunoid 3.

Also, the gate 1. ．． A sensor 4.4 for detecting the leading edge of the paper is arranged on the outer front side of 1, so as to detect the leading edge of the paper reaching the point 1.1. Furthermore, a solenoid 5.5 is located on the same line in front of the gate 1.1 in the transport direction.
The slip roll 6.6, which can be raised and lowered by R,
The slip roll 6.6 is placed under the slip roll 6.6.
A drive roll 8.8 is provided with a clutch 7.7 for providing intermittent drive to 6.

The present invention is constructed as described above.

Next, its operation will be explained.

As shown in FIG. 3(a), it is assumed that the paper 9 is being conveyed between the slip roll 6.6 and the drive rolls 8, 8 in a skewed state shown by the arrow A. When the sensor 4 detects the leading side of the paper 9 due to skew feeding before the gate 10, the signal is sent to a controller (not shown) to operate the solenoid 5 on the side, and also to operate the clutch 27 of the drive roll 8. to release the nip force on the slip roll 6.

In the meantime, as shown in Figure 3 (b), the side that is lagging in progress rotates as shown by arrow B due to the conveying force of the slip roll 6 and drive roll 8 against the paper, and as shown in Figure 3 (C).
Correct the skew as shown in . When the sensor 4 on the side that has reached the gate 1 late detects the leading edge of the paper 9, the solenoid 5 on the side is turned OFF, and the clutch and 7 of the drive roll 8 are also activated to cause the slip roll 6 to nip convey the paper. The force is released and the skew correction of the paper 9 is completed. Next, just before the gate 1.1 is opened by the operation of the gate nozzle 3.3, the solenoid 5.5 of the slip roll 6.6 and the clutch 7.7 of the drive rolls 8, 8 are operated to close the slip roll 6.6. Transfer force is applied to transfer one sheet to the next conveyance means.

(Effect of the invention) The present invention is purchased and operates as described above,
The leading edge of the paper 9 being conveyed in an oblique state on the paper conveyance path is detected by the sensor 4 immediately before reaching the gate 1, and based on this, the slip roll 60 lunoid 5 and the clutch 7 of the drive roll 8 are actuated. When the leading edge of the paper 9 on the side that contacts the gate 1 first contacts the gate 1, the shock is significantly alleviated, so the gate 1 Damage to the paper upon contact is significantly reduced, and the leading edge of the paper that is being conveyed in the skewed state is first passed through the gate 1.
The paper skew is corrected by causing the side that is in contact to lose its conveying force while the side that lags behind maintains its conveying force as before, so the correction ability can be significantly improved. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the paper skew correction device of the present invention, FIG. 2 is a side view of the conveying means section, and FIG. 3(a)
(b) and (C) are plan views showing a state in which the skew of the paper is corrected. In the diagram, 1...gate, 2...shaft, 30...
Solenoid, 40... Seno two, 510 Solenoid, 6
・1・Slip roll, 7@...clutch, 8・Hibiki・
・Drive roll. Patent applicant: Fuji Xerox Co., Ltd. Figure 1 Figure 2 Figure 3 (Q)

Claims (1)

[Claims] Gates are disposed at appropriate positions on both ends of the paper conveyance path so that they can be opened and closed using shafts, and a sensor for detecting the leading edge of the paper is disposed on the outer front side of the gates. By arranging a slip roll equipped with a solenoid and a drive roll equipped with a clutch in an upper and lower pair on the same line at Detected by a sensor, and based on the signal, the conveying force by the slip roll and drive roll on that side is lost,
Paper skew correction device [0