JP3290228B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for communicating character and image information, and more particularly to a facsimile apparatus for ensuring safety when rotation of a platen roller is abnormal.

[0002]

2. Description of the Related Art In a conventional facsimile apparatus having transmission / reception and copying functions, there are many cases in which a drive motor for transporting a document and a drive motor for transporting recording paper are provided for each purpose. Because of the widespread use of these devices in general households, there is a facsimile machine that uses a single common motor to drive the original transport motor and the recording paper transport motor because of their small size and low cost. Is coming.

[0003] Such an apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-1.
As described in Japanese Patent No. 19374, a mechanism operation is performed by an idler mechanism using a frictional force in a transmission mode in which a document transport roller is driven by forward rotation and reverse rotation of a motor, and a reception mode in which a recording paper transport roller is driven. And a switching member such as a solenoid, in addition to the rotation direction of the motor, is operated together to switch to a copy mode for driving the original transport roller and the recording paper transport roller.

In the structure of such a mechanism,
Switching of each mode is performed by controlling the idler mechanism by the rotation amount of the motor.

[0005]

In the above-mentioned prior art, the operation of the mechanism is switched by using an idler mechanism utilizing a frictional force in a drive system of a document conveying roller and a recording paper conveying roller. If an excessive force is applied to the idler mechanism due to any abnormal operation or the like, an operation failure may occur and the operation switching of the mechanism may be incomplete. In such a case, it is determined whether the operation switching of the mechanism is good or not. It was not in a configuration that could do it.

Therefore, if the drive system is driven in such a state that the operation of the mechanism is not properly switched, the rollers for transporting the original document and the rollers for transporting the recording paper do not rotate in the normal rotation direction, and especially in the reception mode. In the case of an abnormal time, there is a problem that the roll-shaped recording paper causes a paper jam or the like.

On the other hand, in a facsimile apparatus in which a drive motor for transporting the original and a drive motor for transporting the recording paper are provided exclusively, there is no switching operation of the drive system. If a paper jam occurs in the recording paper and the recording paper transporting roller is locked, there is no means for detecting an abnormal state. Damage could have occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanism for detecting an incomplete operation switching of a mechanism due to some abnormal operation or the like to prevent the occurrence of paper jams or damage to a drive system. To provide a facsimile machine that does not bother customers

[0009]

An object of the present invention is to provide a rotary driving member of a driving system of a platen roller which presses a thermal head for recording on a recording sheet and conveys the recording sheet.
Reflective surfaces that reflect light and non-reflective surfaces that do not reflect light are alternately arranged, and the respective reflective surfaces and non-reflective surfaces have an area ratio of large, medium, small or large or small, respectively. This is achieved by providing reflectors arranged in such a manner and arranging a light reflection type sensor for determining each arrangement of the reflectors at a position facing the reflectors.

[0010]

In the above construction, when the driving system of the platen roller for transporting the recording paper is driven, the reflection plate provided on the rotary drive member also rotates, and the light reflection type provided at a position facing the reflection plate. The output of the sensor changes depending on the reflection surface and the non-reflection surface of the reflection plate, and the control circuit can determine whether or not the platen roller rotates normally and the rotation direction is normal.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a main part of a drive system of a facsimile apparatus as one embodiment of the present invention, and FIG. 2 is a front view showing a drive system of the facsimile apparatus as one embodiment of the present invention. Now, the configuration of the present embodiment will be described.

In FIG. 2, a leaf spring 16 is mounted on an upper structure 14 which can be opened and closed about a fulcrum 13 at the rear of a base chassis 12 for fixing the chassis 10 and the sub-chassis 11. A thermal head 15 for recording presses a platen roller 1 rotatably provided by a leaf spring 16 between a chassis 10 and an opposite chassis (not shown) via a bearing 70 shown in FIG. It has a configuration.

A contact type reading sensor 5 for photoelectrically converting image information of the document 4 to be transmitted is provided between the chassis 10 and an opposite chassis (not shown). A white sensor roller 2 for transporting the document 4 is provided with a roller arm 18 rotatably mounted on a pin 17 set on the chassis 10.
, Is rotatably mounted. When the roller arm 18 is pressed by a spring member (not shown) provided on the upper structure 14, the sensor roller 2 conveys the document 4 while pressing the document 4 against the contact type reading sensor 5.

At one end of the shaft of the sensor roller 2,
A sensor roller gear 19 is fixed so as to be driven to rotate, and is engaged with a roller intermediate 1 gear 20 rotatably provided on the roller arm 18 so that a rotational driving force is transmitted. The intermediate first gear 20 is engaged with a roller intermediate second gear 21 rotatably provided on the pin 17 so that a rotational driving force is transmitted.

A stepping motor 23 for driving the platen roller 1 and the sensor roller 2 is attached to the chassis 10 with the motor gear 22 fixed to the motor shaft, and the rotation of each gear for transmitting the rotational driving force of the stepping motor 23 is performed. Support shafts 24, 25, 26, 27, 28, 29, 30, 31, 32, 33
But each is planted. The shaft 26 is provided with a motor reduction 1 gear 34 for transmitting the rotational driving force of the motor gear 22.The shaft 27 is provided with a motor reduction 2 gear 35 for transmitting the rotational driving force of the motor reduction 1 gear 34.
Is provided with a center gear 38 for transmitting the rotational driving force of the motor two-speed reduction gear 35. The shaft 28 is provided with an idler mechanism as shown in FIG.

FIG. 3 is an exploded perspective view showing a main part of FIG. That is, as shown in FIG.
An idler arm R36 and an idler arm L37 constituting an idler mechanism are rotatably provided, and an idler gear R39 and an idler gear L40 transmit the rotational driving force of the center gear 38 on the idler arm R36 and the idler arm L37, respectively. It is attached to be.

FIG. 4 is a sectional view showing a section of the idler gear R39 of FIG. The idler gear R39 is, as shown in FIG. 4, an idler pin 36a set on the idler arm R36.
Is rotatably mounted via a spring 41 and a clutch van 42. The idler gear L40 has the same configuration.

Further, a roller reduction gear 43 for transmitting a rotational driving force to the sensor roller 2 is provided on the shaft 25, and is disposed at a position where the rotational drive can be switched by an idler mechanism of an idler gear R39. The roller intermediate third gear 44 is provided on the shaft 24 so that the rotational driving force can be transmitted from the roller reduction gear 43 to the roller intermediate two gear 21.

On the other hand, as shown in FIGS. 2 and 3, the shaft 30 is provided with a stopper arm R45 and a stopper arm L46 for determining a rotation position of the idler arm R36 and the idler arm L37. One end of the stopper arm R45 is engaged with the solenoid 47, a part 46a of the stopper arm L46 is engaged with the stopper arm R45, and the operation of the solenoid 47 causes the stopper arm R45 and the stopper arm L46 to rotate in the same manner. It is configured to be. At one end of the stopper arm R45 and the stopper arm L46, a spring 48 and a spring 49 are stretched between the chassis 10 and the shaft 31 is connected to the stopper arm R45.
And the stopper arm L46.

Further, a platen reduction gear 50 is provided on the shaft 30, which is a fulcrum of rotation of the stopper arm R45 and the stopper arm L46, and is arranged at a position where rotation driving can be switched by an idler mechanism of an idler gear R39. Further, the shaft 29 is provided with a platen intermediate gear 51 for transmitting a rotational driving force to the platen reduction gear 50, and is disposed at a position where the rotational drive can be switched by an idler mechanism of the idler gear L40. The rotation driving force of the platen reduction gear 50 is transmitted to the platen gear 6 fixed to one end of the shaft of the platen roller 1 via a relay gear 52 rotatably provided on the shaft 31. .

A gear 53 provided to transmit the rotational driving force of the roller intermediate two gear 21 is provided with a chassis 10 for discharging the original 4 conveyed by the sensor roller 2 to the outside of the apparatus.
It is fixed to one end of a shaft of a discharge roller (not shown) provided therebetween. Sub chassis 11 fixed to base chassis 12
Between the original and the chassis (not shown)
A separation roller 54 is rotatably provided to separate and transport the sheets 4 one by one, and a separation member 55 is attached to the upper structure 14 so as to contact the separation roller 54.

A document is attached to one end of the shaft of the separation roller 54.
There is provided a separation roller gear 57 having a one-way clutch mechanism that rotates in only one direction for transporting 4. A gear 58 for transmitting a rotational driving force to the separation roller gear 57 is provided on a shaft 56 erected on the sub-chassis 11. Further, gears 59 and 60 for transmitting the rotational driving force of the stepping motor 23 from the gear 53 to the gear 58 are rotatably mounted on the shafts 32 and 33 erected on the chassis 10. The guide 61 is a guide member for guiding the document 4 to the contact type reading sensor 5.

On the other hand, as shown in FIG.
A reflective plate 8 is adhered to the inner surface of the light-receiving element, and a light-reflective photosensor 9 that integrates a light-emitting element that emits light and a light-receiving element that receives the light is arranged at a position facing the reflective plate 8. , Mounted on the substrate 7, and the chassis 10 via the holder 80
It is fixed on top.

FIGS. 5 and 6 are front views showing specific examples of the reflection plate 8 of FIG. The reflecting plate 8 shown in FIG. 1 includes a reflecting surface 8a that reflects light and a non-reflecting surface 8b that does not reflect light.
The one having the configuration shown in either FIG. 5 or FIG.

Next, the operation of this embodiment will be described. First, the transmission operation will be described with reference to FIG.
In the standby state of the apparatus, the mechanism driving system is in the transmission state shown in FIG. In this state, when the original 4 to be transmitted is inserted along the guide 61 up to the contact portion between the separation roller 54 and the separation member 55, an original detection sensor (not shown) detects the original 4, and the stepping motor 23 moves in the direction of the arrow. Rotate. This rotational driving force is transmitted to the center gear 38 via the motor gear 22, the first motor reduction gear 34, and the second motor reduction gear 35, and when the center gear 38 is rotated in the direction of the arrow, the clutch van 42 and the idler shown in FIG. The idler arm R36 rotates about the shaft 28 by the frictional force generated between the arms R36, and transmits the rotational driving force of the idler gear R39 to the roller reduction gear 43.

At this time, by the same operation, the idler arm L37 tries to connect the idler gear L40 to the platen intermediate gear 51, but the stopper arm L46 and the idler arm L37 come into contact with each other, and the rotation of the idler arm L37 is stopped. As a result, the rotational driving force to the platen intermediate gear 51 is cut off, so that the platen roller 1 does not rotate. Therefore, the output of the light-reflecting photosensor 9 that observes the change of the reflecting plate 8 attached to the platen gear 6 does not change, and if the output of the light-reflecting photosensor 9 changes, the mechanism is changed. Can be easily determined by a control circuit (not shown).

The driving force transmitted to the roller reduction gear 43 is
Roller middle 3 gear 44, roller middle 2 gear 21, roller middle 1
The sensor roller 2 is transmitted to the sensor roller gear 19 via the gear 20, and the sensor roller 2 pressing the contact type reading sensor 5 is driven. Further, the gear 53 is attached to the roller intermediate 2 gear 21 so as to be able to transmit the rotational driving force, so that the gear 59, the gear 6
0, the rotational driving force is transmitted to the separation roller gear 57 via the gear 58, and the separation roller 54 which is in contact with the separation member 55 is rotated so that the inserted original 4 is brought into contact with the contact type reading sensor 5 and the sensor roller 2. It is transported to the abutting part. At this time, the friction coefficient between the separation member 55 and the document 4 is smaller than the friction coefficient between the separation roller 54 and the document 4 and larger than the friction coefficient between the back and front of the document 4, so that a plurality of sheets are inserted. Documents 4 can be separated and conveyed one by one.

Contact type reading sensor 5 and sensor roller 2
The document 4 conveyed to the area where the document abuts is pressed by the contact-type reading sensor 5 while being conveyed by the sensor roller 2, and the contact-type reading sensor 5 photoelectrically converts the image information into an electric signal. Each sheet is transmitted and discharged to the outside of the apparatus by a guide member (not shown).
After all the originals 4 have been transmitted, the mechanism driving system is kept in the transmission state and enters the standby state, and the transmission operation ends.

Next, the receiving operation will be described with reference to FIG. FIG. 9 is a front view showing a main part of FIG. 2 in a reception state. When a signal is sent from the other party, the solenoid
47 is sucked to rotate the stopper arm R45, and at this time, the stepping motor 23 rotates in the direction opposite to the transmission operation. This rotational driving force is applied to the motor gear 22, the motor deceleration 1
Center gear 38 via gear 34 and motor reduction 2 gear 35
When the center gear 38 is rotated, the idler arm R36 rotates about the shaft 28 in the direction opposite to the direction during the transmission operation, and as shown in FIG.
Is transmitted to the platen reduction gear 50.

At this time, by the same operation, the idler arm L37 rotates in the direction opposite to the direction at the time of the transmission operation, so that the idler gear L40 only idles without being connected to any gear. By this mechanism operation switching, the rotational driving force to the sensor roller gear 19 is cut off, so that the sensor roller 2 and the separation roller 54 do not rotate.

The rotational driving force transmitted to the platen reduction gear 50 is transmitted to the platen gear 6 via the relay gear 52,
The platen roller 1 is driven to rotate, and the recording paper 3 pressed by the platen roller 1 by the thermal head 15 can be conveyed.

After the mechanism operation switching is completed, the stepping motor 23 is rotated in the direction of arrow B to
3 is pulled into the device to reduce the unrecorded portion at the tip.
In this case, idler arm R36 and idler arm L37
Is driven by the stopper arm R45 and the stopper arm L46, so that the mechanism is not switched and is driven in the state of FIG.

At this time, when a change due to the rotation of the reflector 8 attached to the platen gear 6 is detected by the light reflection type photosensor 9, the reflection surface 8a outputs Hi and the non-reflection surface 8b outputs Lo. When the reflecting plate 8 having the configuration shown in FIG. 5 is used, the relationship between the sensor output and time as shown in FIG. 7B is obtained. When the structure shown in FIG. 6 is used as the reflection plate 8, a relationship between sensor output and time as shown in FIG. 8B is obtained.

Next, the stepping motor 23 is rotated in the direction of arrow A to perform recording on the recording paper 3 pressed by the platen roller 1. At this time, the reflector 8 attached to the platen gear 6
When the light reflection type photosensor 9 detects the change due to the rotation of the reflection surface 8a, the reflection surface 8a similarly has the Hi output and the non-reflection surface 8b has the Lo output, so that the reflection plate 8 having the configuration shown in FIG. In this case, a relationship between the sensor output and time as shown in FIG. 7A is obtained. When the structure shown in FIG. 6 is used as the reflection plate 8, a relationship between the sensor output and time as shown in FIG. 8A is obtained.

That is, when the structure shown in FIG. 5 is used as the reflection plate 8, FIG. 7A shows the output of the light reflection type photosensor 9 during recording, and FIG. 7 shows the output of the light reflection type photosensor 9 when the position is returned. The difference between (a) and (b) in FIG. 7 is that, when attention is paid to the Hi output, the time of Hi changes in order of t1, t2, and t3 in FIG. Then, it changes in the order of t3, t2, t1. This is the same when focusing on the Lo output. Note that time has a relationship of t1 <t2 <t3. On the other hand, when the structure shown in FIG. 6 is used as the reflection plate 8, FIG. 8A shows the output of the light reflection type photosensor 9 during recording.
(B) shows the output of the light reflection type photosensor 9 when the recording paper 3 is returned. (A) and (b) of FIG.
8A is different from the time of the Lo output after the Hi output in FIG. 8A, but is the same time in FIG. 8B.

As described above, the rotation direction of the platen roller 1 can be easily determined by a control circuit (not shown) regardless of whether the reflection plate 8 has the configuration shown in FIG. 5 or the configuration shown in FIG. . Therefore, even if a rotation abnormality of the platen roller 1 occurs due to a switching failure of the mechanism operation, a paper jam of the recording paper 3, or the like, it can be easily detected.

When the receiving operation is completed, the solenoid 47 is sucked, the stepping motor 23 is rotated, and the idler arm R36 and the idler arm L37 are rotated, and the transmission state is set as shown in FIG.

Next, the copying operation will be described with reference to FIG. FIG. 10 is a front view showing a main part of FIG. 2 in a copying state. When the original 4 is inserted into the device, the original 4 is brought into contact with the
After being conveyed to the abutment section 2, the solenoid 47 is sucked, the stepping motor 23 is rotated in the same direction as the transmission operation, the idler arm L37 is rotated, and the mechanism drive system is as shown in FIG. Copying state.

In this state, the stepping motor 23 is
When the platen roller 1 rotates in the direction indicated by the arrow, the platen roller 1, the sensor roller 2, and the separation roller 54 rotate, and the information read by the contact reading sensor 5 is recorded on the recording paper 3.
At this time, the rotation direction of the platen roller 1 is detected in the same manner as in the receiving operation. When the copying operation is completed, the solenoid 47 is sucked, the stepping motor 23 is rotated, and the idler arm L37 is rotated, and the transmission state is set as shown in FIG.

[0040]

According to the present invention, there is provided a facsimile apparatus comprising a platen roller for conveying a recording sheet and a thermal head for recording the recording sheet on the recording sheet while pressing the recording sheet against the platen roller. By detecting the direction with a sensor or the like, even if a trouble such as a paper jam in recording paper conveyance occurs due to a malfunction of the mechanism, the occurrence can be easily detected.

In particular, in recent years, as described above, the facsimile apparatus has become popular in general households, and the trend toward small size and low price has been strengthened. It is becoming. In a facsimile apparatus in which a platen roller for transporting recording paper and a transport roller for transporting a document are driven by a single motor, friction is applied to a drive system as means for switching to a transmission, reception, or copying mechanism state. Since the idler mechanism using force and the solenoid are used, the operation switching of the mechanism may be incomplete, and if the drive system operates while the operation switching of the mechanism is incomplete,
Since the rotation direction of the platen roller is reversed or stopped with respect to the normal rotation direction, a trouble such as a paper jam may occur at this time. Also send mechanism,
If the means for detecting the state of the mechanism of reception and copying is provided, the above problem can be solved, but it is practically difficult to adopt it because of the price and the complexity of the mechanism.

Therefore, even in such a case, by detecting the malfunction of the mechanism by detecting the rotation of the platen roller as in the present invention, the above problem can be solved with a simple mechanism configuration and at low cost. There is an effect that can be solved.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a drive system of a facsimile apparatus as one embodiment of the present invention.

FIG. 2 is a front view showing a drive system of the facsimile apparatus as one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a main part of FIG. 2;

FIG. 4 is a sectional view showing a section of the idler gear R39 of FIG. 3;

FIG. 5 is a front view showing a specific example of the reflection plate 8 of FIG.

FIG. 6 is a front view showing another specific example of the reflection plate 8 of FIG. 1;

FIG. 7 is a waveform diagram showing an output waveform of the light reflection type photosensor 9 when the reflection plate 8 of FIG. 1 has the configuration shown in FIG.

8 is a waveform diagram showing an output waveform of a light reflection type photosensor 9 when the reflection plate 8 shown in FIG. 1 has the configuration shown in FIG.

FIG. 9 is a front view showing a main part of FIG. 2 in a reception state.

FIG. 10 is a front view showing a main part of FIG. 2 in a copying state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Platen roller, 2 ... Sensor roller, 3 ... Recording paper, 4 ... Document, 5 ... Contact type reading sensor, 6 ... Platen gear, 7 ... Substrate, 8 ... Reflector, 8a ... Reflective surface, 8b ...
Non-reflective surface, 9: light reflection type photo sensor, 10: chassis,
11 Sub chassis, 12 Base chassis, 15 Thermal head, 23 Stepper motor, 36 Idler arm R, 37 Idler arm L, 39 Idler gear R, 40 Idler gear L, 47 Solenoid, 54
... separation roller, 55 ... separation member.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Minoda 1410 Inada, Katsuta, Ibaraki Pref.Information and Media Division, Hitachi, Ltd. (72) Inventor Kazuyasu Sato 502 Kandamachi, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-2-119374 (JP, A) JP-A Sho 63-224555 (JP, A) JP-A-5-14639 (JP, A) JP-A-59-12029 (JP, A) JP-A-63-77259 (JP, A) (58) Fields investigated (Int. H04N 1/00-1/00 108 B65H ^7/ 00-7/20 B65H 43/00-43/08

Claims (4)

(57) [Claims] 1. A platen roller for conveying a recording sheet, a thermal head for recording the recording sheet on the recording sheet while pressing the recording sheet against the platen roller, a conveying roller for conveying a document, and transferring image information from the document. A reading unit that converts the read signal into an electric signal, the platen roller, and the conveyance unit;
One motor for driving the roller and driving from the motor
Force between the platen roller and the transport roller.
Selectively transmit to one or both
A facsimile apparatus comprising: a switching member; and a detecting means for detecting rotation and a rotation direction of the platen roller. A platen roller for conveying the recording paper, a thermal head for recording the recording paper on the recording paper while pressing the recording paper against the platen roller, a conveying roller for conveying the original, and transferring image information from the original. A reading unit for converting into a read electrical signal, at least a motor,
Drive unit for driving a platen roller and the transport roller
And detecting the rotation and rotation direction of the platen roller in the facsimile apparatus configured by
Means, and the detecting means comprises a reflecting surface for reflecting light.
And a non-reflective surface that does not reflect light,
Any one of the rotation drive transmission systems up to the platen roller
A reflector attached to the rotary drive member of the device and emits light
Light emitting element section and light receiving element for receiving light from the light emitting element section
Part, which is attached at a position facing the reflection plate.
And a detection sensor,
Kushimiri machine . 3. The facsimile apparatus according to claim 1 , wherein said detection means includes a reflection surface that reflects light and a non-reflection surface that does not reflect light, and a rotation drive transmission system from said motor to said platen roller. A reflection plate attached to any one of the rotation driving members, a light-emitting element unit that emits light and a light-receiving element unit that receives light from the light-emitting element unit, and a detection sensor attached to a position facing the reflection plate, A facsimile machine characterized by comprising: 4. A facsimile according to claim 2 or 3.
In the apparatus, in the reflection plate, the reflection surface and the non-reflection surface are alternately arranged, and each reflection surface and each non-reflection surface have an area ratio of large, medium, small or large, and small, respectively. A facsimile apparatus characterized by being arranged as follows.