JP2710590B2 - Printing paper transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing paper transporting device used for transporting single-leaf printing paper in a printing apparatus, and more particularly to a function for correcting skew of a printing paper.

[0002]

2. Description of the Related Art Conventional skew correcting means for correcting skew of a printing paper transporting device used for transporting a single sheet of printing paper in a printing apparatus is provided for a printing paper of a specific width. Only skew can be corrected, but skew of printing paper of other widths cannot be corrected.To transport printing paper of other widths straight, the printing paper must be It is necessary to insert it into the printing device along the line.

[0003]

As described above, the printing paper transporting device of the conventional printing apparatus can correct skew only for printing paper of a specific width, but printing paper of other widths can be corrected. Cannot correct the skew of the printing paper, so that the printing paper must be inserted into the printing device along the abutting portion of the paper insertion slot, and the burden on the operator is large. I have.

[0004]

According to the present invention, there is provided a printing paper transport apparatus comprising: two sensors disposed at a predetermined interval perpendicular to a transport direction of a printing paper to detect a leading edge of the printing paper;
A control unit that receives the detection signals of the two sensors and calculates the amount of skew of the printing paper from the time difference between them, a plurality of feed rollers that convey the printing paper that has passed through the sensors, A feed shaft mounted and rotated with the plurality of feed rollers, a plurality of first pressure rollers for pressing each of the plurality of feed rollers from below, and the plurality of first pressure rollers; A first solenoid that drives a first shaft that holds a roller to drive the retreating operation of the plurality of first pressure rollers, and a bearing and a roller disposed downstream of and in parallel with the feed shaft. A second shaft that holds the bearing and the roller and rotates with the roller, and a second shaft that is controlled by the control unit. By operating a motor to rotate, two second pressure rollers for pressing each of the bearing and the roller from below, and a third shaft holding the two second pressure rollers A second solenoid for driving a retreat operation of the second pressure roller, and a second solenoid disposed downstream of the bearing and the roller to detect a leading end of the printing paper. It has two sensors.

[0005]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
(A) is a plan view and (b) is a side view. 2A and 2B are diagrams showing an operation state of the embodiment of FIG. 1, wherein FIG.
(B) is a side view. 3A and 3B are views showing a state after the skew correction of the embodiment of FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

In the embodiment shown in FIG. 1, the printing paper 1 is arranged at a predetermined interval at a right angle to the conveying direction of the printing paper 1 (arrow A).
Sensors 2 and 3 for detecting the leading edge of the sensor, a control unit 4 for inputting detection signals of the two sensors and calculating a skew amount B of the printing paper 1 from a time difference between them, and sensors 2 and 3 , A plurality of feed rollers 10 for transporting the printing paper 1 passing therethrough, a feed shaft 15 mounted and rotated by the plurality of feed rollers 10, and each of the plurality of feed rollers 10 pressed from below. A plurality of pressure rollers 11 and a plurality of pressure rollers 11
A solenoid 16 for driving a retreating operation of the plurality of pressure rollers 11 by operating a shaft 16 for holding the bearings, a bearing 7 and a roller 8 disposed downstream of and in parallel with the feed shaft 15, a bearing 7 and a roller 8 And a motor 1 for rotating the roller 8 held by the shaft 14 together with the shaft 14
3, two pressure rollers 9 for pressing each of the bearings 7 and the rollers 8 from below, and a solenoid 6 for driving a shaft 17 holding the pressure rollers 9 to drive the retracting operation of the pressure rollers 9. , One sensor 5 disposed downstream of the shaft 14 to detect the leading end of the printing paper 1.

Next, the operation of the printing paper transport device configured as described above will be described.

[0009] As shown in FIG.
The leading edge of the printing paper 1 conveyed in the direction (see FIG. 1) is detected by two sensors 2 and 3 arranged at right angles to the direction of arrow A. The detection signals from the sensors 2 and 3 are sent to the control unit 4, and the control unit 4 calculates the skew amount B of the printing paper 1 from the time difference between the detection signals.

Subsequently, the leading end of the printing paper 1 conveyed in the direction of arrow A is detected by a sensor 5 provided downstream of the shaft 14 holding the bearings 7 and the rollers 8, and the conveying motion is stopped. (The conveyance of the printing paper may be stopped after a certain time from when the sensor 2 or 3 detects the printing paper). When the solenoid 6 is opened in this state, the pressure roller 9 rises (arrow E), and the printing paper 1 is held between the bearing 7 and the roller 8.

Subsequently, when the solenoid 12 is driven, the pressure roller 11 is separated from the feed roller 10 (arrow F), so that the holding of the printing paper 1 is released, and the printing paper 1 is released.
Is held by the pressure roller 9, the bearing 7 and the roller 8.

In this state, when the control unit 4 operates the motor 13 to rotate the shaft 14 in the direction of arrow C (when the skew direction of the printing paper 1 is opposite, the shaft 14
Is rotated in the direction of arrow D), only the roller 8 rotates together with the shaft 14. At this time, since the bear rig 7 is free to rotate the shaft 14, the skew of the printing paper 1 is corrected. At this time, the operation amount of the motor 13 is controlled by the control unit 4 so as to be equivalent to the skew amount B of the printing paper 1.

When the correction of the skew of the printing paper 1 is completed, as shown in FIG. 3, the solenoid 12 is opened to raise the pressure roller 11 (arrow G), and the printing paper 1 is held between the roller 10 and the roller 12. Let it. Subsequently, the solenoid 6 is driven to lower the pressure roller 9 (arrow H), and the bearing 7 and the roller 8 are separated from the printing paper 1. As a result, the printing paper 1 is sandwiched between the pressure roller 11 and the roller 10, so that the printing paper 1 can be transported again in the direction of arrow A by driving the feed shaft 15.

[0014]

As described above, the printing paper transport apparatus of the present invention has two sensors for detecting the leading edge of the printing paper, and prints from the time difference between the two sensors by inputting the detection signals of the two sensors. A control unit that calculates the amount of skew of the sheet, a shaft that holds a bearing and a roller disposed in parallel with a feed shaft that rotates with a feed roller attached thereto, and that rotates only the roller by rotating this shaft By providing a rotating motor and controlling the rotation of the motor by the control unit according to the calculated skew amount, there is an effect that the skew of the printing paper having an arbitrary width can be automatically corrected. Therefore, there is an effect that the burden on the operator can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, wherein (a) is a plan view and (b) is a side view.

FIG. 2 is a diagram showing an operation state of the embodiment of FIG. 1;
Is a plan view, and (b) is a side view.

3A and 3B are views showing a state after skew correction of the embodiment in FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing paper 2.3.5 Sensor 4 Control part 6.12 Solenoid 7 Bearing 8 Roller 9.11 Pressure roller 10 Feed roller 13 Motor 14.16.17 Shaft 15 Feed shaft

Claims (2)

(57) [Claims] 1. Two sensors disposed at a predetermined interval perpendicular to the transport direction of a printing paper and detecting the leading edge of the printing paper, and inputting detection signals of the two sensors to each other. A control unit for calculating the amount of skew of the printing paper from the time difference, a plurality of feed rollers for transporting the printing paper passing through the sensor, and a feed shaft mounted and rotated with the plurality of feed rollers A plurality of first pressure rollers that press each of the plurality of feed rollers from below, and a first shaft that holds the plurality of first pressure rollers are operated to operate the plurality of feed rollers. A first solenoid for driving a retreat operation of the first pressure rollers, a bearing and a roller disposed downstream of and in parallel with the feed shaft, A second shaft that holds the roller and rotates together with the roller, a motor that is controlled by the control unit to rotate the second shaft, and that presses each of the bearing and the roller from below. Second pressure rollers, and a second solenoid that drives a retracting operation of the second pressure rollers by operating a third shaft that holds the two second pressure rollers. Characteristic printing paper transport device. 2. Two first sensors which are arranged at a predetermined interval at right angles to the transport direction of the printing paper and detect the leading edge of the printing paper, and detect detection signals of the two first sensors. A control unit that inputs and calculates the skew amount of the printing paper from the time difference between them, a plurality of feed rollers for transporting the printing paper that has passed through the first sensor, and the plurality of feed rollers are mounted. Feed shaft that rotates
A plurality of first pressure rollers that press each of the plurality of feed rollers from below, and a first shaft that holds the plurality of first pressure rollers is operated to operate the plurality of feed rollers. A first solenoid that drives the retreat operation of the first pressure roller, a bearing and a roller disposed downstream of and in parallel with the feed shaft, and a second that holds the bearing and the roller and rotates together with the roller. Shafts, a motor controlled by the control unit to rotate the second shaft, two second pressure rollers for pressing each of the bearing and the rollers from below, and the two A third shaft that holds the second pressure roller is operated to drive the retracting operation of the second pressure roller. Solenoid and the printing paper transport apparatus, characterized in that it comprises a one second sensor for detecting the leading end of the printing paper is disposed downstream of the bearing and the roller.