JPH041152Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a document feeding device in a facsimile machine.

2. Description of the Related Art In a facsimile machine, when reading and transmitting a document, the document must be nipped using a paper feed roller, a feed roller, etc., and sent to a reading unit. This document feeding mechanism for feeding the document is provided with an electromagnetic clutch to control the rotation of shafts such as rollers (Japanese Patent Laid-Open No. 159056/1983). However, if an electromagnetic clutch is provided for each of the plurality of pairs of rollers, the volume of the electromagnetic clutch itself is large, so that the entire facsimile machine has to be enlarged.

Problems to be Solved by the Invention The present invention attempts to eliminate the use of an electromagnetic clutch for the roller shaft in conventional devices, which results in an increase in the size of the device.

Means for Solving the Problems In the present invention, an electromagnetic clutch is not provided on the roller shafts of the paper feed roller that pulls out the transmitted original on the original plate, the paper feed roller that sends the original to the reading section, etc. Providing a one-way clutch prevents the device from increasing in size.

Example Embodiments of the present invention will be described with reference to the drawings.

The drawing is a schematic diagram showing the drive system.

In the apparatus of the present invention, a pair of paper feed rollers 2, a pair of paper feed rollers 3, and a pair of ejection rollers 4 are arranged substantially vertically below a document placement plate 1. Paper feed roller pair 2
consists of a first paper feed roller 2a and a second paper feed roller 2b, and the paper feed roller pair 3 includes a first paper feed roller 3a,
The discharge roller pair 4 consists of a first discharge roller 4a and a second discharge roller 4b. The first paper feed roller 2a is integrally supported by a first paper feed roller shaft 21a, and a pulley 23a is provided on the shaft 21a via a one-way clutch 22a. The second paper feed roller 2b is supported by the second paper feed roller 21b, and a pulley 23b is integrally fixed to the end of the coaxial shaft 21b. The first paper feed roller 3a of the paper feed roller pair 3 is integrally supported by the first paper feed roller shaft 31a.
A pulley 33a is provided at one end of 1a via a one-way clutch 32a. The one-way clutch 32a is connected to the pulley 3 in the counterclockwise direction in FIG.
The rotational force is transmitted in the direction of rotating 3a. The pulley 33a is integrated with a pulley 33a' which is freely supported on the first paper feed roller shaft 31a. A round belt 51 is crossed and spanned between the pulley 33a' and the pulley 23a. A pulley 33a' is provided at the other end of the first paper feed roller shaft 31a via a one-way clutch 32a', and a gear 34 is also provided. One way clutch 32
a' is the pulley 33 in the counterclockwise direction in Figure 1.
Transmit rotational force in the direction of rotating a′. The second paper feed roller 3b is supported by a shaft bearing member (not shown) on the second paper feed roller 31b, and
A gear 35 and a pulley 33b are fixedly provided on the paper, and the gear 35 meshes with the gear 34 fixed on the first paper feed roller shaft 31a. Pulley 33b and pulley 2 fixed to the aforementioned second paper feed roller shaft 21b
3b, a round belt 52 is provided in a crossed manner.

Pulleys 42a and 42a' are provided at both ends of the first ejection roller shaft 41a of the ejection roller pair 4, and a round belt 53 is placed between the pulley 42a' and the pulley 33a' of the first paper feed roller shaft 31a. and bridge it.

55 is a step motor for driving, which includes a pulley 56 fixed to the motor shaft and the first paper feed roller shaft 31a.
A toothed belt 54 is stretched between the pulley 33a of the first discharge roller shaft 41a and the pulley 42a of the first discharge roller shaft 41a.
The second discharge roller 4b is supported by a second discharge roller shaft 41b, is in pressure contact with the first discharge roller 4a, and rotates as a result of the rotation of the first discharge roller 4a.

A sensor 61 detects the presence of the original 62 on the original placing plate 1, and a photoelectric sensor 63 detects whether the original has been sent.

Next, the operation of the device of the present invention will be explained.

When an original 62 is placed on the original placing plate 1, the placed original 62 is detected by a sensor 61, and is pulled out by a pair of paper feed rollers 2 starting from the lowest one. That is, the sensor 61 detects the document 62.
When the presence of the step motor 55 is detected, the step motor 55 rotates, and the toothed belt 54 is rotated clockwise. As the toothed belt 54 rotates, the pulleys 33a and 42a that mesh with the toothed belt 54 rotate, respectively. However, the pulley 33a is supported by the first paper feed roller shaft 31a via the one-way clutch 32a, and since it rotates in the opposite direction to the rotation transmission direction of the one-way clutch 32a, the rotation of the pulley 33a is limited to the first paper feed roller 31a.
The rotation of the pulley 33a is transmitted to the pulley 23a via the pulley 33a' integrated with the pulley 33a and the round belt 51, and is transmitted to the first paper feed roller 2a via the one-way clutch 22a of the pulley 23a. Figure 1 Rotates counterclockwise. Due to the rotation of the toothed belt 54, the first discharge roller shaft 4
The pulley 42a' of 1a rotates in the clockwise direction in FIG. 1, and rotates the pulley 33a'' in the counterclockwise direction via the round belt 53.The pulley 33a'' has one direction that transmits rotation in the counterclockwise direction. Since the clutch 32a' is interposed, the first paper feed roller shaft 31a is rotated counterclockwise via the one-way clutch 32a'. This rotation is transmitted to the second paper feed roller shaft 31b by gears 34 and 35, and the second paper feed roller 3b
Rotate clockwise in Figure 1. The rotation of the pulley 33b, which is integral with the second paper feed roller shaft 31b, is transmitted to the pulley 23b via the cross-hung round belt 52, and rotates the second paper feed roller 2b counterclockwise. During this rotation of the paper feed roller pair 2, the lowest document 62 on the document placement plate 1 is drawn into the nip point of the paper feed roller pair 2 by the first paper feed roller 2a; The upper paper is prevented from being drawn into the nip point by the counterclockwise rotation of the second paper feed roller 2b.

The leading edge of the document 62 drawn into the nip point of the paper feed roller pair 2 reaches the paper feed roller pair 3. The paper feed roller pair 3 includes first and second paper feed rollers 3a and 3b.
Since the rotation is in the opposite direction, the document 50 is fed between the rollers 3a and 3b, and when the leading edge of the document 62 reaches the sensor 63 due to the rotation of the rollers 3a and 3b, the sensor 63 senses this and starts the step motor 55. Reverse it. Due to this reversal, the toothed belt 54 rotates in the opposite direction as shown by the white arrow in FIG. The belt 51 rotates in the opposite direction and the pulley 23a also rotates in the opposite direction, but the one-way clutch 22a is connected to the first paper feed roller shaft 21.
a and the pulley 23a, and the clutch 2
Since the rotation transmission direction of 2a is opposite, the rotation is not transmitted to the first paper feed roller shaft. In the case of the first paper feed roller 3a, since the one-way clutch 32a of the first paper feed roller shaft 31a transmits the rotation in the counterclockwise direction in FIG. The rotation in the clockwise direction is transmitted to the first paper feed roller shaft 31a, which rotates the first paper feed roller 3a in the counterclockwise direction, but this rotation direction is the same as before. The rotation of the first paper feed roller shaft 31a in the counterclockwise direction is controlled by the second paper feed roller shaft 3 through the gears 34 and 35.
1b to rotate the second paper feed roller 3b, and the second paper feed roller 2b is transmitted through the pulley 33b, round belt 52, pulley 23b, and second paper feed roller shaft 21b.
Rotate. This rotation is also transmitted to the first paper feed roller 2a which is in contact with the second paper feed roller 2b. Since each roller of the discharge roller pair 4 has a roller shaft integrated with a pulley, it rotates in the opposite direction due to the reverse rotation of the toothed belt, and the first and second discharge rollers 4a, 4b
The original is held at the nip point and ejected.

Effects As mentioned above, the device of the present invention switches the driving force to the roller by providing a one-way clutch on one of the pair of rollers for feeding the document, so an expensive and large electromagnetic clutch is not required. It is possible to intermittent rotation without using the roller, and as a result, the volume ratio of the roller portion to the entire device can be reduced, making it easier to make the entire device more compact and inexpensive.

[Brief explanation of the drawing]

1 and 2 are schematic side views, and FIG. 1 shows the rotation of the roller when the step motor rotates in the clockwise direction, and FIG. 2 shows the rotation of the roller when the step motor rotates in the counterclockwise direction. FIG. 3 is a schematic front view in the direction of arrow A in FIG. 1 with the second paper feed roller, second paper feed roller, and second ejection roller removed. 2...Paper feed roller pair, 3...Paper feed roller pair, 4
...Discharge roller pair, 45...Step motor.

Claims (1)

[Scope of utility model registration request] In a document feeding device in which a pair of paper feed rollers 2, a pair of paper feed rollers 3, and a pair of ejection rollers 4 are arranged in sequence, and a document 62 is taken in between, nipped, and fed, the rollers constituting the pair of paper feed rollers 2 are arranged in sequence. A one-way clutch 22 is attached to one end of the first paper feed roller shaft 21a.
the pulley 23a via the second paper feed roller shaft 2
1b is provided with a pulley 23b, and two one-way clutches 32a, 32a', a first and second one-way clutch, are provided at both ends of the first paper feed roller shaft 31a. 32a' is provided with a pulley 33a'', and a pulley 33b is provided on the second paper feed roller shaft 31b.
and the first and second paper feed roller shafts 31
gears 34 and 35 are provided in mesh with a and 31b, and pulleys 42 are provided at both ends of the first discharge roller shaft 41a.
a, 42a', a belt 54 is placed between the pulley 56 of the step motor 45 and the pulleys 33a, 42a so that the pulleys rotate in the same direction, and a belt 54 is placed between the pulley 42a' and the pulley 33a''. The belt 53 is crossed and hung between the pulley 33a' and the pulley 23a, and the belt 51 is crossed and hung between the pulley 33a' and the pulley 23a.
A belt 5 is installed between the pulley 23b and the pulley 33b.
The two one-way clutches are configured to cross each other, and each of the one-way clutches transmits the rotation in the direction of taking in the document in the flow direction, and the rotation from the drive source capable of forward and reverse rotation is transmitted to the first one-way clutch of the first paper feed roller. A document feeding device in a facsimile machine characterized by transmitting information to a roller shaft via a clutch.