JPH0537754A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To realize the facsimile equipment with a small size and simplified structure by providing plural eccentric cams having deep and shallow notches driven coaxially to a rotary shaft of a paper feed roller to simplify the paper feed means. CONSTITUTION:A gear 22 arranged to an output shaft of a reversible drive motor 21 is driven to deliver a torque to a unidirectional clutch gear 23 at transmission and an eccentric cam 1 is driven counter clockwise and projections 6a, 8a of levers 6, 8 engage with notches 1c, 1a. As a result, an image sensor 4 is pressed into contact onto a paper feed roller 9 and a thermal head 5 is parted from the roller 9. Moreover, the gear 22 is driven in a direction to deliver a torque to the unidirectional clutch gear 28 at reception and the eccentric cam 1 is driven clockwise and the projections 6a, 8a of the levers 6, 8 engage with notches 1b, 1c. As a result, the image sensor 4 is parted from the roller 9 and the thermal head 5 is pressed to have the recording paper 12 with the roller 9 and itself inbetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus which simplifies the paper feeding means for sending originals and recording papers and downsizes them.

[0002]

2. Description of the Related Art In recent years, the spread of facsimile machines has been remarkable. Facsimile machines have been used for business purposes, but in recent years, they have also been widely used for household purposes, and there is a further demand for downsizing, weight reduction, and cost reduction of facsimile machines.

A conventional facsimile machine will be described below. The internal structure of the facsimile device is roughly divided into a transmitting side and a receiving side. A paper feed roller is provided on both the transmission side and the reception side. An image sensor as an original reading unit is pressed against the paper feed roller on the transmission side, and a thermal head as a printing unit is pressed against the paper feeding roller on the reception side. Has been done. Each roller is driven by a different motor.
Therefore, since two paper feed rollers and two motors associated therewith are used, this is an obstacle to downsizing and weight saving of the facsimile apparatus. As a solution to this problem, in order to reduce the size of the facsimile device, a facsimile device has been proposed in which an eccentric cam is provided to greatly simplify the structure (see, for example, Japanese Patent Laid-Open No. 1-37238).

As shown in FIGS. 7 and 8, in the initial state and the copy state, the eccentric cams 25 and 26, which move synchronously by the driving of the gears 34 and 35, do not act on the levers 27 and 28, respectively. Therefore, the image sensor 4 and the thermal head 5 are kept pressed against the paper feed roller 18 by the springs 36 and 37. When the transmission original 13 is inserted from the insertion opening 10 in this state, the paper feed roller 18 rotates counterclockwise, and at that time, the recording paper 12 is sandwiched between the thermal head 5 and the paper feed roller 18. Since they are pressed against each other, they are fed simultaneously with the rotation of the paper feed roller 18 to make a copy. At this time, in the eccentric cams 25 and 26, the gear 29 for rotating them is a one-way clutch gear,
It does not rotate because it does not transmit power.

When transmitting the transmission document 13, first, the motor 3
0 rotates clockwise. As a result, the gear 29
Rotates and the eccentric cams 25 and 26 rotate to the state shown in FIG. 9 (at this time, the paper feed roller 18 does not rotate because the gear 31 of the one-way clutch gear idles and does not transmit power). The eccentric cams 25 and 26 have levers 27 and
28 is pushed at the contact points 27b and 28b, so that the thermal head 5 is separated from the paper feed roller 18. When the transmission document 13 is inserted from the insertion opening 10 in this state, the paper feed roller 18 rotates counterclockwise and feeds the transmission document 13, and the image sensor 4 reads the transmission document 13.

At the time of reception, the motor 30 rotates in the clockwise direction to the state shown in FIG. The image sensor 4 is separated from the paper feed roller 18, and the transmission original 13 cannot be fed. When receiving in this state, the paper feed roller 1
8 rotates counterclockwise, and the thermal head 5 prints on the recording paper 12.

When the reading point of the image sensor 4 and the printing point of the thermal head 5 are misaligned with the generatrix of the paper feed roller 18, the transmission original 13 and the recording paper 12 are skewed and cannot be accurately fed, and reading failure or printing is performed. It causes a defect. Therefore, as shown in FIG. 11, the paper feeding roller 1 is used to prevent the deviation of the bus bar of the paper feeding roller 18 from the reading point and the printing point.
The image sensor 4 is provided with a claw 4a that engages with the shaft 18a of the eight. In this case, the fulcrum 32 of the levers 27, 28,
It is necessary to provide rattling 33 so that it can move freely in accordance with the claw 4a to some extent. Therefore, the contact points 27b and 28b of the eccentric cams 25 and 26 also move, so the design is made in consideration.

[0008]

However, since the eccentric cams 10 and 11 and the gears 34 and 35, which move synchronously at the time of reception and transmission, are arranged in the above-mentioned conventional structure, the size and weight can be reduced. The problem is that it hinders the cost and increases the cost, and that the design of the claw 4a (or the claw of the thermal head 5) of the image sensor 4 (or the thermal head 5) that engages with the paper feed roller 9 becomes complicated. I had.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a facsimile apparatus which is downsized and whose structure is simplified.

[0010]

In order to achieve this object, a facsimile apparatus of the present invention is a paper machine rotated by a motor that rotates in both clockwise and counterclockwise directions and a one-way clutch gear that transmits the power of the motor. The feed roller, an eccentric cam having two kinds of shallow dents that rotate coaxially with the rotation axis of the paper feed roller, and an image sensor having a convex portion that engages with the dent of the eccentric cam
It has a configuration with one lever.

[0011]

With this configuration, the image sensor or the thermal head is aligned with the paper feed roller by one eccentric cam.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, fulcrums 17,
The receiving side opening / closing cover 2 and the transmitting side opening / closing cover 3 which are respectively opened and closed by 16 and the housing 7 form a box shape. The image sensor 4 to which the lever 8 is attached and the thermal head 5 to which the lever 6 is attached are urged by springs 14 and 15 to be pressed against the paper feed roller 9. The image sensor 4 and the thermal head 5
Are arranged so that the respective perpendiculars intersect at 120 degrees. Deep depressions 1a and 1b and a shallow depression 1c are formed in the eccentric cam 1 which rotates coaxially with the rotation axis of the paper feed roller 9 which presses the image sensor 4 or the thermal head 5 against the paper feed roller 9. The transmission original 13 is inserted through the insertion opening 10 of the housing 7 during transmission, and the recording paper 12 printed by the thermal head 5 during reception is ejected through the ejection opening 11 of the housing 7.

As shown in FIGS. 3 and 4, the drive means for the paper feed roller 9 and the levers 6, 8 has a gear 22 provided on the output shaft of a motor 21 capable of forward and reverse rotation, and a first one-way clutch. The gear 23 and the second one-way clutch gear 24 are meshed with each other. When the power is transmitted to the one-way clutch gear of the first direction or the second direction and the rotation directions of the first direction and the second direction are opposite to each other, the one-way clutch gear of the second direction or the first direction is The eccentric cam 1 is rotated by the rotation of the gear 24 by the gear 25 that is engaged with the one-way clutch gear 24 in a configuration that does not transmit power and does not transmit power, and the one-way clutch gear 23
The configuration is such that the paper feed roller 9 is rotated by the rotation of the gear 26 meshed with the gear.

The operation of the facsimile apparatus configured as described above will be described below.

As shown in FIG. 2, the dents 1a and 1b of the eccentric cam 1 are in contact with the convex portions 6a and 8a of the levers 6 and 8 as shown in FIG. The head 5 and the image sensor 4 are in pressure contact with the paper feed roller 9. In this state, when the transmission document 13 is inserted from the insertion port 10, a sensor (not shown) detects the transmission document 13 and the paper feed roller 9 rotates in the counterclockwise direction. 12
Since it is sandwiched between the thermal head 5 and the paper feed roller 9, it is fed at the same time to perform copying. At this time, the eccentric cam 1 does not rotate because the gear 24 for rotating the eccentric cam 1 is a one-way clutch gear and does not transmit power to the eccentric cam 1.

At the time of transmission, the gear 22 arranged on the output shaft of the motor 21 shown in FIG. 4 rotates in the direction for transmitting power to the one-way clutch gear 24, and the eccentric cam 1 rotates in the opposite direction to the clockwise direction. To the position shown in, and the convex portion 8a of the lever 8
The dent 1a is engaged with the convex portion 6a of the lever 6 by the dent 1c. As a result, the image sensor 4 is pressed against the paper feed roller 9, but the thermal head 5 is separated from the paper feed roller 9, and the recording paper 12 is not fed even if the paper feed roller 9 rotates (the eccentric cam 1 rotates). While the paper feed roller 9 is rotating, the one-way clutch gear 24 idles and does not transmit power, so the paper feed roller 9 does not rotate.

In this state, when the transmission document 13 is inserted through the insertion opening 10, a sensor (not shown) causes the transmission document 13 to be inserted.
Is detected, the paper feed roller 9 rotates to feed the transmission document 13, and the image sensor 4 reads the transmission document 13.

At the time of reception, the gear 22 arranged on the output shaft of the motor 21 shown in FIG. 4 rotates in the direction of transmitting power to the one-way clutch gear 24, and the eccentric cam 1 rotates in the clockwise direction to move to the direction shown in FIG. To the position shown in FIG.
The dent 1b is engaged with the protrusion 8a of the lever 8 by the dent 1c. As a result, the image sensor 4 moves to the paper feed roller 9
Apart from the above, only the thermal head 5 presses the recording paper 12 so as to sandwich the recording paper 12 with the paper feed roller 9. When the eccentric cam 1 is rotating, the paper feed roller 9 does not rotate because the one-way clutch gear 24 idles and does not transmit power.

In this state, the paper feed roller 9 rotates and the paper is also fed to the recording paper by the thermal head 5 to complete the reception.

At the time of sending and receiving, after the operation is completed,
The eccentric cam 1 rotates and returns to the position shown in FIG.

As described above, according to this embodiment, the three dents 1a, which rotate coaxially with the rotation axis of the paper feed roller 9,
By providing the eccentric cam 1 in which 1b and 1c are formed,
The image sensor 4 and the thermal head 5 can be brought into pressure contact with the paper feed roller 9 in three combinations, and two eccentric cams are provided on the opposite side of the support shaft around which the image sensor 4 and the thermal head 5 rotate. Compared with the example, this embodiment of one eccentric cam 1 can downsize the facsimile apparatus and reduce the cost.

In the conventional example, a complicated structure is required to prevent the deviation of the bus bar of the paper feed roller 9, the reading point of the image sensor 4, and the printing point of the thermal head 5, but in the present embodiment, the paper feed roller 9 is used. With the eccentric cam 1 that is sandwiched and arranged,
It can also serve as a means for matching the busbars.

[0024]

As is apparent from the above description of the embodiments, the present invention is a paper feed roller rotated by a motor that rotates in both clockwise and counterclockwise directions and a one-way clutch gear that transmits the power of the motor. And an eccentric cam having two kinds of shallow dents that rotate coaxially with the rotation axis of the paper feed roller, an image sensor having a convex portion that engages with the dent of the eccentric cam, and two levers provided on the thermal head. With the configuration including the above, it is possible to realize an excellent facsimile apparatus which can be downsized and whose structure can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing a concept of a main part of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of an essential part showing engagement between an eccentric cam and a lever of the facsimile apparatus.

FIG. 3 is a front view of an essential part showing a power transmission means of the facsimile apparatus.

FIG. 4 is a side view of an essential part showing a power transmission means of the facsimile apparatus.

FIG. 5 is a front view showing a positional relationship between an eccentric cam and a lever during transmission of the facsimile device.

FIG. 6 is a front view showing the positional relationship between the eccentric cam and the lever at the time of reception of the facsimile device.

FIG. 7 is a front view showing a concept of a main part of a conventional facsimile apparatus.

FIG. 8 is a front view of the main parts showing the power transmission means of the facsimile apparatus.

FIG. 9 is a front view showing a state of the facsimile apparatus during transmission.

FIG. 10 is a front view showing a state of the facsimile apparatus when receiving.

FIG. 11 is an exploded perspective view of an image sensor provided with a paper feed roller and a claw of the facsimile apparatus.

[Explanation of symbols]

 1 Eccentric cam 4 Image sensor 5 Thermal head 6,8 Lever 6a, 8a Convex part 9 Paper feed roller

Claims (1)

Claim: What is claimed is: 1. A motor that rotates in both clockwise and counterclockwise directions, a paper feed roller that is rotated by a one-way clutch gear that transmits the power of the motor, and a rotation shaft of the paper feed roller. And an eccentric cam having two kinds of shallow dents that rotate on the same axis as that of the eccentric cam, and two levers having two protrusions that are engaged with the dents of the eccentric cam provided on the image sensor and the thermal head.