JPS606543A - Paper conveying device - Google Patents

Abstract

PURPOSE:To reduce the occurrence of a power transfer loss and to effectively utilize the driving power of a drive source, by a method wherein drive sources are mounted to their respective conveyance rollers. CONSTITUTION:With first and second motors simultaneously run, first and second rollers 14 and 15 are rotated independently from each other and freely in disregard of a difference in the number of revolutions. A paper fed out from a paper feeder is fed in a nip part between the convey roller 14 and a pinch roller 6 to exert a conveyance force thereon. The first and the second motor take the form of a d.c. commutator motor, and this causes the forces exerted on the first and the second motor through the medium of the paper to be balanced with each other, or causes either the convey rollers 14 or 15 to slip on the paper if the paper eats into a nip part between the convey rollers 14 or 15 and the pinch roller 6 or a second pinch roller 7, respectively. Thus, the paper is conveyed regularly even if there is a difference in speed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a paper conveyance device used in copying machines and the like.

Prior Art A plurality of conveyance rollers are provided at intervals, and one conveyance roller is placed outside. A paper conveyance device is known that is connected to a drive source to receive driving force from the outside, and that transmits the driving force to each conveyance roller by connecting each conveyance roller with a chain, a timing belt, or the like.

With this structure, the number of parts for the entire device increases, making it difficult to make the entire device compact.
Since the driving force is transmitted to each conveyance roller by a chain, a timing belt, etc., there is a problem that power transmission loss occurs and the full driving force of the drive source cannot be effectively utilized.

OBJECTS OF THE INVENTION It is an object of the present invention to make the entire device compact and easy to assemble and maintain.

Structure of the Invention A guide chute is provided with a plurality of conveyance rollers and a drive source for fully driving each conveyance roller.

Example Figure 1 is an overall perspective view, Figure 2 is a sectional view taken along the line 1-n,
The guide chute 1 has a flat body 1α and a bent piece IA on both sides.
, Ih, making it a long member with a downward U-shape, and a pair of left and right first... A second bracket 2°3 is erected and fixed at intervals in the longitudinal direction,
A first bracket is provided between the left and right pair of first brackets 2, 2 and between the second brackets 3, 3. A second pinch roller shaft 4.5 is installed so as to be movable up and down. 2nd pinch roller shaft 4.5
There are a pair of left and right 1st and 2nd pinch rollers 6.6, 7.7.
are rotatably provided, and a spring 8
It is biased to move downward.

Openings Bq are formed in the main body 1α facing the respective pinch rollers 6.6 and 7.7, and first and second openings Bq are formed in the bent pieces rb and rb on both sides. Second conveyance roller axis IQ, If
are opposed to the opening 9 and serve as the second driving source. The first
A pair of left and right i-th and second transport rollers Ia, la, 15.15 are provided on the transport roller 14 and the second transport roller shaft 11, and each transport roller 14° 14, 15, 15 is connected to each opening 9. each bin and the first. Second motor 12
．． Reference numeral 13 is designed to be energized and driven when a copy start button on the main body of the copying machine is pressed, and the paper conveying device is installed in series with a paper feeding device (not shown) of the copying machine. In addition, 1. The power source for the second motors 12 and 13 may be provided in the guide chute 1, or may be supplied from the main body of the copying machine.

Next, details of each part will be explained along with the operation.

When you press the copy start button, the first copy starts. 2nd motor 12.13
are simultaneously driven, and the first. Second conveyance roller I 4 t
15 are rotated independently and without permission, ignoring slight differences in rotational speed.

The paper sent out from the paper feeder is transferred to the first conveyance roller 14
and the second pinch roller 6, and receives a conveyance force.

At this time, the rotation degree (that is, the conveying speed) of the first conveying roller I4 is set to be faster than the sheet feeding speed of the sheet feeding device so that the sheet does not buckle when being fed into the nip portion (passing the sheet).

Next, the paper i is transferred to the second transport roller I5 and the second pinch roller 7.
is fed into the nip between the first and second conveying rollers 14.
, 15, the conveyance direction is regulated by the main body lα of the guide chute l.

At this time, the first. The initial set speeds of the second conveyance rollers 14 and 15 do not have to match completely.

In other words, the second conveying rollers 14, 15 and the eighth conveying rollers 14, 15 and the eighth. Second
When the paper is caught in the nip portion of the pinch roller 6.7, the forces acting on the first and second motors 12, 13 via the paper are balanced.

Alternatively, if one of the conveying rollers 14, 15 slips against the paper, the paper will be normally conveyed even if there is a speed difference.

Specifically, 1. By making the second motor 12.13 a DC commutator motor, the second motor 12.
．． Normal conveyance can be achieved by balancing the forces acting on the first . Second transport row 214.1
When there is a difference in roller rotational speed between the paper sheets, the conveyance rollers 14 and 15 are allowed to slip against the paper, and the difference in roller rotational speed is absorbed and the sheet can be conveyed normally.

In other words, in order to absorb the difference in speed between the conveyance rollers 14 and 15, any mechanism that causes the conveyance roller and paper to slip when the conveyance force exceeds a certain level is sufficient, and the strength of the spring 8 can be adjusted to convey the paper. The pressing force between the rollers 14 and 15 and the pinch roller 6.7 may be adjusted.

When the paper is being transported only by the second transport roller I5 and is being sent to the next transport section (not shown), the m2 transport roller 15 slips against the paper.

Alternatively, the paper can be transported normally by balancing the number of rotations to match the transport speed of the paper.

Note that the guide chute l may be provided with three or more conveyance rollers and pinch rollers.

Further, a plurality of guide chutes each having a plurality of conveyance rollers and pinch rollers may be arranged in series.

In this way, the length of the paper conveyance path can be easily changed.

Effects of the Invention Since the guide chute 1 is provided with a conveyance roller and a drive source to form the entire device into one unit, the entire device can be made small and compact, and assembly and maintenance can be performed easily.

Since each conveyance roller is provided with a drive source, there is little power transmission loss, and the driving force of the drive source can be used effectively.

[Brief explanation of the drawing]

＠l[R is an overall perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line nn in FIG. 1. 1 is a guide shoe), j2. J3 is the drive source. 14.15 is a conveyance roller.

Claims (1)

[Claims] A guide chute 1 that regulates the paper conveyance direction. A paper conveyance device characterized in that a plurality of conveyance rollers 14.15 are provided at intervals in the conveyance direction, and a drive source 12.13 for driving each conveyance roller 14°I5 is provided in the guide chute 1. .