JPS6052441A - Registration correcting apparatus for copying machine - Google Patents

Abstract

PURPOSE:To certainly correct the interval and the inclined advance of form- sheets by arranging a linear stepping motor in the transportation passage for form sheets and arranging a rotor equipped with a solenoid and allowing a gate installed onto the solenoid to move in reciprocation at a constant speed. CONSTITUTION:Form sheets are transported towards between a pinch roll 3 and a resist roll 4 by the weak nip force formed between a slip roll 1 and a driving roll 2. In this case, a rotor 7 which moves in reciprocation on a linear stepping motor 5 shifts in the state where the gate 8 of a solenoid 6 projects into a form- sheet transportation passage towards the resist roll 4 from a home position 9. The form-sheet is allowed to reach the gate 8 before the gate 8 reaches the resist roll 4, and the transportation speed of the form-sheet is restricted. Therefore, the interval between the succeeding sheet for the preceding sheet can be corrected to a constant value, and the inclined advance state is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a registration correction device for a copying machine or the like.

(Prior Art) A conventional device of this type consists of a transfer section for a photoreceptor and a conveyance section consisting of a pair of upper and lower slip rolls and a drive roll arranged at appropriate positions on a conveyance path leading to the transfer section. A registration tray that opens and closes intermittently using a solenoid, etc.
By arranging a congate, or by arranging a pinch roll and a pair of registration storage rolls above and below in place of this gate, and driving the registration storage 1/roll intermittently using a clutch or the like, paper can be removed. The advance of the paper is temporarily stopped just before it is fed to the transfer section of the photoreceptor, and by this stopping, the gap between the preceding paper and the following paper is corrected to a constant value, and the skew of the paper is also corrected. It was configured. However, the registration/correction device with this type of configuration has limited correction ability in the case of registration systems such as high-speed machines where the paper conveyance distance is very narrow, or machines where there is variation in paper conveyance to the registration section. Since the value is low, there is a drawback that the following paper collides with the preceding paper, causing damage to the paper.

(Object of the Invention) The present invention has been made to eliminate the drawbacks of the conventional registration correction device described above. Even with such a machine, while the paper travels from the conveyance section consisting of slip rolls and drive rolls in the paper conveyance path to the registration roll section, which is arranged in a pair above and below the pinch rolls, there is a difference between the preceding paper and the following paper. A copying machine registration tray that keeps the intervals constant and also corrects the skew of these sheets.
The purpose of this invention is to provide a correction device.

(Structure of the Invention) For this purpose, the present invention provides a paper transport path as described in 611 from a transport section consisting of a pair of upper and lower slip rolls and a drive roll to a pinch roll and a pair of upper and lower registration rolls. A linear stepping motor is disposed, and the linear stepping motor has a rotor equipped with a solenoid so as to be movable forward and backward in the paper conveyance direction. By providing a gate, the gate is reciprocated at a constant speed from the conveying section consisting of the slip roll and the driving roll to the pinch roll and the registration storage roll section provided in a pair above and below, and during this time, the gate is moved back and forth at a constant speed. The paper interval and skew are corrected by keeping the conveyance speed of the following paper constant with respect to the paper at the gate.

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

FIG. 1 is a side view of the registration correction apparatus of the present invention, and FIG. 2 is a perspective view of the registration gin roll portion of the same.

In these figures, a copying machine σ (not shown) has a pair of upper and lower slip rolls 1 and a drive roll 2 arranged at appropriate positions on the paper conveyance path from the paper feed section to the photoreceptor.
．． A pair of upper and lower pinch rolls 3 and a registration roll 4 are disposed at appropriate positions in front of the transfer section of the photoconductor 2 [6]. A linear stepping motor 5 is arranged at a suitable position outside these rolls 1, 2, 3, 4, and a rotor 7 equipped with a solenoid 6 is attached to the upper part of the linear stepping motor 5 in a reciprocating manner.
A gate 8 is attached to the lower part of the solenoid 6 so as to be able to enter and exit the paper conveyance path.

The present invention is constructed as described above. Next, its operation will be explained.

The paper is conveyed from a paper feed section (not shown) along a paper conveyance path in the direction indicated by the arrow. Then, the conveyance force caused by the weak nip force between the slip roll 1 and the drive roll 2 transports it toward the space between the pinch roll 3 and the registration roll 4. At this time, the rotor 7 on the linear stepping motor 5 The slip roll 1 is reciprocating on the linear stepping motor 5.
The paper is located at the home position 9 on the side and is moving from there in the direction of the registration roll 4 with the gate 8 of the solenoid 6 protruding into the paper transport path below, and the paper is being moved here. It passes between the slip roll 1 and the drive roll 2 and is conveyed. Then, before the gate 8 reaches the position of the registration storage roll 4, the paper catches up with the gate 18, and the leading end hits the gate 8, thereby regulating the conveyance speed.
As a result, the distance between the succeeding paper and the preceding paper is corrected to be constant, and the skewed state thereof is also corrected. Then, the paper is nipped between the pinch roll 3 and the registration roll 4 by the gate 8 passing through the registration storage nroll 4 part, and the gate 8 is further pulled up from the paper conveyance path by the solenoid 6. K
Then, it is transported to the transfer section of the photoreceptor. and,
The rotor 7, which has completed pulling the paper between the pinch roll 3 and the registration roll 4, is operated by the solenoid 6.
The paper returns to the home position 9, and here the gate 8 is again projected into the paper conveyance path, and the paper is directed toward the registration roll 4.

(Effects of the Invention) The present invention corrects the conveyance interval and skew of the paper by repeating the above-described operations, and the leading edge of the paper being conveyed along the paper conveyance path is connected to a gate or a pitch roll and a register instead of the gate. The paper movement is temporarily stopped by the ration roll, and during this stop, the conveying force of the slip roll and the drive roll is not used to correct the conveyance interval and skew of the paper, so the correction ability is accurate, and Since the subsequent paper does not collide with the preceding paper, it is possible to significantly reduce troubles such as paper jams caused by the subsequent collision of the preceding paper.

It should be noted that there is no reason why the present invention should be limited to the above-mentioned embodiments, and even if the timing at which the gate 8 is projected into the paper transport path by the solenoid 6 is set to After nipping the leading edge of the leading paper between the pinch roll 3 and the registration storage roll 4, the rotor 7 returns to the home position 9 on the linear stepping motor 5, and then moves toward the registration roll 4 at a predetermined timing. Alternatively, when the solenoid 6 catches up with the trailing edge of the preceding paper, it may be made to project into the paper conveyance path.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one embodiment of the registration correction apparatus of the present invention, and FIG. 2 is a perspective view of the registration control roll portion of the same. In the figure 1...Slip roll, 2...Drive roll, 3
...Pinch roll, 4...Registration roll, 5...Linear stepping motor, 6...
Solenoid, 7...Rotor, 8...Gate, 9
·home position.

Claims (1)

[Claims] A linear stepping motor is placed at a suitable position between a pair of upper and lower slip rolls and a drive roll, and between a pinch roll and a registration roll, which are placed at a suitable position on the paper conveyance path of a copying machine, etc., and the motor has a rotor equipped with a solenoid. is installed so that it can reciprocate, and the solenoid is provided with a gate that intermittently enters and exits the paper conveyance path as necessary, thereby preventing the leading edge of the paper conveyed through the paper conveyance path from slipping. After passing between the roll and the drive roll, before being transferred between the pinch roll and the registration roll, it abuts the gate, and is transported at the moving speed of the gate to between the pinch roll and the registration roll, and during this time 1. A registration Ron correction device for a copying machine, etc., which corrects the conveyance interval and skew between the paper and the preceding paper.