JPS60101558A - Form conveying device of copying machine - Google Patents

Abstract

PURPOSE:To supply a form at correct timing and a correct attitude by arranging a gate roll which is driven by a stepping motor according to basic timing between two conveyor rolls. CONSTITUTION:The gate roll 8 which is driven and controlled by the stepping motor is arranged between the 1st and the 2nd conveyor roll couples 7 and 9. A support roll 10 contacts the roll 8 coaxially with a guide roll 11 and a gate 21 is provided to the small-diameter part of the roll 8. A form 3 is conveyed by the roll couple 7 and stopped temporarily with the on/off signal of a sensor 20 to form a curl 3'. At this time, the form 3 is pressed against the gate 21 correctly by the rolls 10 and 11 to correct skew and registration. Then, the roll 8 increases in speed gradually with a timing signal and becomes equal in speed to the roll couple 9 to convey the form. Consequently, the form 3 is conveyed at the correct timing and correct attitude.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for completely feeding a photoreceptor of a copying machine at the correct timing and orientation.

Prior Art A paper alignment means is provided between the paper conveyance means and the photoreceptor, and the paper alignment means performs positioning (registration) and paper posture correction (skew) of the paper conveyed by the paper conveyance means, so that the paper is correctly placed on the photoreceptor. A device is known that feeds paper depending on the timing and posture.

However, since the paper alignment means is structured to feed the entire paper into the nip of a pair of press-contacted rolls or to butt the paper against an alignment gate, after the paper is aligned correctly, driving force is applied again to transport the paper. When doing so, the paper may not be able to completely follow the paper conveyance means, or the position and timing of the aligned paper may be disturbed again due to misplaced or bent paper.

In other words, in a paper alignment means in which a pair of rolls are in full pressure contact, when the paper is conveyed by a pair of rolls after alignment, the paper slips against the rolls and the alignment is disturbed. When conveying the paper, the paper may become misaligned or bent, causing misalignment.

In addition, with conventional devices, when the paper is fully conveyed after alignment, it is affected by the thickness of the paper being conveyed and the paper conveyance speed.
Therefore, when conveying different sheets of paper or changing the conveyance speed, it is not possible to correctly supply paper, and when conveying sheets at high speed, the entire apparatus becomes larger and the cost increases.

Purpose of the invention It is an object of the present invention to be able to perform paper registration and complete skew correction with high accuracy even when paper is fed all at once at high speed, to feed paper to a photoreceptor at the correct timing and orientation, and to be small and inexpensive. do.

Components of the Invention The present invention comprises a sheet aligning means, a first conveying means for feeding the sheets to the aligning means, and a sheet conveying means using a step motor for gripping the aligned sheets and conveying them in accordance with a basic timing signal from the main body of the copying machine. , and a second conveyance means for supplying the paper conveyed by the paper conveyance means to the photoreceptor.

Embodiment FIG. 1 is an overall front view, and FIG. 2 is a perspective view of the remaining main parts. Bottom plate 5 of cassette 2
By pushing up with the spring 6, it is brought into pressure contact with the feed roll 4.

A first transport roll pair 7, a gate roll 8, and a second transport roll pair 9 are sequentially disposed between the photoreceptor 1 and the feed roll 4, and a support roll 10 is in light contact with the gate roll 8. The support roll 10 is provided coaxially with the drive shaft of the guide roll 11 via a one-way latch so that it can freely rotate only in the paper transport direction. Upper and lower feed-in chutes 12.13 are provided between the feed roll 4 and the first transport roll pair 7, and upper and lower feed-in chutes 14.1 are provided between the first transport roll pair 7 and the photoreceptor 1.
5 is installed. The second transport roll pair is located at the cutout window 16.17 of the upper and lower foot inchutes 14.15, and the gate roll 8 and support roll 10 are located at the cutout window +8. l'? The upper feed-in chute 14 is bent upward, and the lower feed-in chute 15 is provided on the side up to the first pair of transport rolls 7, and a sensor 20 is provided in the middle thereof.

The first transport roll pair 7 serves to transport the paper 3 to the gut roll 8.

The gut roll 8 has a large diameter portion 8α and a small diameter portion 8h, and the support roll 10 is in light contact with the large diameter portion 8α, and a gate (claw piece) 21 is provided on the small diameter portion 8h. The gate 21 is located slightly in the paper transport direction from the line connecting the central axes of the gut roll 8 and the support roll 10, and is disposed so as to guide the paper being transported, and securely grips the paper. There is. The gate roll 8 rotates in accordance with the basic timing of the copying machine and remains stationary, rotates slowly at the beginning of rotation, gradually increases speed, and when the paper 3 protrudes to the second transport roll pair 9, the gate roll 8 moves to the second transport roll. The goot roll 8 is driven by a stepping motor so as to have the same speed as the pair 9.

The guide roll 11 is made of an elastic material such as sponge and has a five-hole shape, and is constantly rotated to apply a weak conveyance force to the paper 3. At this time, the coaxial support roll 10 can freely rotate only in the paper conveyance direction via a one-way clutch, but normally, at the same time as the guide roll 11 rotates, due to the friction of the shaft part, A weak rotational force is applied to the support roll 10 against friction with the guide roll 8.

Next, I will explain the operating theory.

When the feed roll 4 rotates, the paper 3 is sent to the first transport roll pair 7, and the paper 3 is sent by the first transport roll pair 7 toward the gate roll 8 which is stationary at the position shown in FIG.

1st When the transport roll pair rotates 70 times, the leading edge of paper 3 is at gate 2.
It stops after a certain period of time after reaching 1.

This stop time is controlled by a sensor 20 that is turned on and off depending on the paper 3. When the tab υ is fed, the paper 3 is fed and the sensor 20 is turned on.

0FF(, stops after a predetermined time.

Therefore, when the first transport roll pair 7 stops, the paper 3 is curled 3' as shown in FIG. 1, and the leading edge of the paper 3 is in contact with the groove 21. Registration is corrected (aligned).

At this time, the leading edge of the paper 3 passes between the gate roll 8 and the support roll 10 by the conveying force of all the first conveying means, and when it reaches the gate 21, the leading edge of the paper 3 stops there, and soon the sensor 20 turns ON. The paper becomes stationary based on the OFF signal.

At this time, the guide roll 8 and the support roll 10 are simultaneously
By interposing the paper between them, the contact friction increases, and the support roll 10 becomes stationary.

Furthermore, when the leading edge of the paper 3 collides with the gate 21, the paper 3 floats up near the gate 21 and contacts the guide roll 11, so a weak conveying force is applied to the paper 3, and the leading edge of the paper 3 always touches the gate 21. be firmly pressed.

If the tab 9 and guide roll 11 are not provided, the paper 3 may float up near the gate 21 and come off the gate 21.

Next, in response to the basic timing signal from the copying machine main body, the o-rule 8 is rotated slowly 9, and the paper 3 is fully placed in the second position.
The paper is slowly transported toward the transport roll pair 9, and the speed is gradually increased to transport it to the second transport roll pair 9. Then, when reaching the second transport roll pair 9 which is constantly rotating, the gout roll 8 and the support row A/10 have the same speed as the second transport port, the second transport roll pair 9, and from then on, the second transport roll pair 9 The driving is controlled by a stepping motor so that the paper 3 is conveyed.

At this time, when the gate roll 8 and the support roll 10 begin to rotate, it is preferable to move one roll of the first transport roll pair 7 upward to release the holding of the paper 3;
The support roll 10 does not necessarily have to hold the paper 3. Also, the support roll 10 can have a mechanism that moves the axis of the guide roll 11 up and down so that the paper 3't-pressure is conveyed only when the gout roll 8 is rotating. It is. The separation distance at this time is about 1 to 10 cm.

Further, instead of the first pair of conveyance rolls 7, a paper conveyance means having a control ball placed on a constantly rotating conveyance belt may be provided. The tab 9 feeds the paper 3 to the gate 21 of the gate 4-8, and a first (general feeding means) that can adjust the skew and registration may be provided.

Effects of the Invention Even when the paper is fully conveyed at high speed, the registration and skew of the paper can be corrected with high precision, the paper can be fed to the photoreceptor at the correct timing and orientation, and the paper can be made smaller and less expensive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being an overall front view and FIG. 2 being a perspective view of a main part. 1 is a photoreceptor, 3 is paper, 7 is a first conveyance means, and 9 is a second conveyance means.

Claims (1)

[Claims] an aligning means for aligning the sheets 3; a first conveying means 7 for feeding the sheets 3 to the aligning means; When the paper 3 is transported toward the second transport means and gradually increases its speed to reach the 21st general transport means, the gout roll 8 and the support roll 10 are paper transport means whose speed is the same as that of the second transport means. and the second transport means 9 for supplying the paper 3 transported by the paper transport means to the photoreceptor 1.