JPH0120830B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device for facsimile and the like.

Generally, this type of recording device includes a recording head,
It includes a conveyance roller that conveys a roll of recording paper, a cutter that cuts the recording paper after recording, and a discharge roller that discharges the recording paper. In this way, in the after-cut method, after cutting the recording paper, it is necessary to pull back the leading edge of the unrecorded recording paper from the cutting position to the storage position in order to remove the leading edge margin.

Therefore, even though the ejection roller that ejects the recorded paper onto the tray and the platen roller that moves the paper over the recording head are in the same direction during the recording operation, only the platen roller is rotated in the opposite direction during the pullback operation. There must be.

For this reason, conventionally, a recording apparatus has been constructed by providing separate drive sources for the paper ejection roller and the platen roller, making the recording apparatus large and expensive.

The present invention has been made in view of these points, and an object of the present invention is to provide a recording apparatus that is small and economical and can speed up the ejection of recorded recording paper.

The present invention uses a single forward-reverse drive source whose main purpose is to drive the conveyance roller, and the paper ejection roller is always rotated in a fixed direction regardless of whether the drive source is forward or reverse, thereby making the device more compact and economical. In this case, by changing the number of rotations of the discharge roller during forward rotation and reverse rotation, it is possible to eliminate slack in the recording paper during forward rotation and to discharge the paper at high speed during reverse rotation.

An embodiment of the present invention will be described based on the drawings.
First, Fig. 1 shows an outline of a facsimile device, in which a document reading section 1 and a received image recording section 2 are arranged in upper and lower positions.
arranged in tiers. The document reading section 1 is provided with a document mounting table 4 on which a plurality of documents 3 can be set. A document separation and feeding mechanism is provided in front of the document placement table 4. That is, when the document 3 is set in this mechanism, a drive source (not shown) moves the paper feed roller 5 and the separation roller 6.
rotates and sends the original 3 to the left, and the separation plate 7 is in pressure contact with the separation roller 6, so even if two originals 3 are sent overlapping, the upper original 3 will not be separated. It is held down by a plate 7 and is separated and sent out one by one starting from the lower one. Further, a conveyance roller 8 is provided to convey the document 3 sent out from the separation roller 6 to a reading position.
A light source 10 is provided that illuminates the document 3 passing over the target glass 9 at this reading position, and an image sensor 13 is provided whose reflected light is imaged by an optical system such as a mirror 11 and a condensing lens system 12. ing. Here, the image information read by the image sensor 13 is subjected to processing such as binarization and data compression before being sent to the receiving side. works. A discharge roller 15 is provided to discharge the document 3 that has passed the reading position toward the tray 14.

On the other hand, in the received image recording section 2, a roll recording paper 16 is set in a holder 17, and the roll recording paper 16 is pulled out via a guide roller 18 by a platen roller 19 serving as a conveyance roller.
After the received image information is recorded by the recording head 20 that is in opposing contact with the platen roller 19, the received image information is cut by the cutter 21, and the paper is transferred to the tray by the paper ejection roller 22.
It is configured to discharge onto 3. here,
The received image recording section 2 is made into a unit, and a rail 24 is fixed to the lower part, and a bottom plate 25 of the facsimile machine is attached.
It can be freely pulled out to the left in the figure along a guide rail 26 provided in the figure.

A more specific configuration of this received image recording section 2 will be explained with reference to the drawings from FIG. 2 onwards.
First, between the platen roller 19 and the recording head 20, there is usually 2 to 3 kg of A4 size recording paper.
The pressure is applied by a spring to be described later, and the roll recording paper 16 is conveyed in accordance with the rotation of the platen roller 19. Here, this platen roller 19
In order to rotate the rotary shaft 27, a pulley 28 having a large diameter is fixed to one end of the rotating shaft 27. This pulley 28 is connected by a belt 29 to a pulley 31 fixed to the output shaft of a pulse motor 30, which is the only drive source and can freely rotate in forward and reverse directions. Therefore, the rotation of the pulse motor 30 is decelerated and transmitted to the platen roller 19, and in accordance with the rotation of the pulse motor 30, the recording paper is conveyed with high precision, that is, the sub-scan feed is performed.

Further, a pulley 32 is also fixed to the rotating shaft 27 of the platen roller 19, and is connected via a belt 33 to a pulley 35 fixed to the rotating shaft 34 of the upper roller 22A of the paper ejection roller 22. Here, the upper roller 22A is made of a metal material, and the lower roller 22B is made of a rubber material, and both are in pressure contact with each other.

The recording head 20 is mounted on a bracket 36.
The bracket 36 is supported by an arm portion 38 that is rotatable about the shaft 37 of the guide roller 18. This arm part 3
A spring 40 is provided between the platen roller 19 and the fixing pin 39 to ensure pressure contact between the platen roller 19 and the recording head 20. Further, at the bottom of the bracket 36, there is a PC board 4 for the recording head 20 driver.
1 is installed. Next, levers 43 are provided on both sides, which are rotatable about the rotating shaft 27 of the platen roller 19 and have a cam portion 42 on the lower side that can push down the bracket 36.
They are combined by a tight plate 44 to form a cover body 45. A shaft 46 is attached to the upper side of this lever 43. The cutter 21 is composed of a movable blade 21A and a fixed blade 21B,
A rotating shaft 49 rotatably supported by a holder 48
The movable blade 21A is supported by a support frame 50 to which the movable blade 21A is fixed. This support frame 50
A portion of one side is formed into a substantially U-shape, and a roller 5 is formed.
The cutter lever 52 to which the cutter lever 1 is attached is fixed and pulled clockwise by a spring 54 provided between it and a fixing pin 53.

Next, the holder 17 into which the roll recording paper 16 is set has a curved portion 55 at its bottom that is approximately similar in shape to the roll shape of the roll recording paper 16.
A friction member 5 is provided on one side continuous with this curved portion 55.
6 is affixed to it, and the roll recording paper 1 is fixed to the shaft 57 and exposed through a notch (not shown) on the other side.
A remaining amount detection plate 58 is provided to detect the remaining amount of the remaining amount by pressing down on the remaining amount. This pressing force of the remaining amount detection plate 58 is ensured by a torsion spring 60 against a lever 59 fixed to the shaft 57. Further, a hole is formed on the lower side of one side of the remaining amount detection plate 58, and a reflective sensor 61 is provided to detect the near-end mark of the roll recording paper 16 through this hole.

The lever 59 is rotatably displaced as the remaining amount detection plate 58 detects the remaining amount, and the shaft 57
A lever 64 is provided which is formed in an arc shape with the center at the center and has an elongated hole 63 through which a pin 62 at the tip of the lever 59 passes. One end of this lever 64 is supported by the shaft 46 of the cover body 45. The tip of the lever 59 is bent to form a wire 65.
One end of is locked. The wire 65 is stretched while being guided by rollers 66 and is locked to a fixing pin 68 via a spring 67. Since this spring 67 is always weaker than the clockwise rotational force of the lever 59 given by the torsion spring 60, it expands and contracts in accordance with the movement of the lever 59. They are arranged vertically on the front side of 2. and,
A pointer 69 is fixed to the wire 65 and indicates the amount of movement of the wire 65 between the rollers 66A and 66B, that is, the remaining amount of the roll recording paper 16. This pointer 69 moves from bottom to top as the roll recording paper 16 becomes smaller in diameter between the rollers 66A and 66B, and displays the remaining amount on the front of the received image recording section 2.

Incidentally, the roll recording paper 16 is set by opening the cover body 45. When the cover body 45 is opened, the remaining amount detection plate 58 and therefore the lever 59 are pulled by the lever 64 to open the inside of the holder 17, as shown in FIG. Since the bracket 36 and therefore the recording head 20 are separated from the platen roller 19 and the paper conveyance path is opened, the roll recording paper 16 can be moved to the holder 1 without being obstructed by the remaining amount detection plate 58.
7, it can be easily set to the guide roller 18 and platen roller 19 side.
When the cover body 45 is in the open state, the bracket 36
It is held by the pressure between the cam part 42 and the cam part 42. Then, by closing this cover body 45, the setting is completed.

Continuing, the rail 24 is connected to the unit side plate 70.
A bent portion 71 is formed on the side surface of the unit side plate 71 and spaced apart by approximately the length of the unit side plate 70, and a hanger 72 is fixed to the bent portion 71. Also,
A bracket 73 is fixed to the bottom plate 25 so as to be close to and parallel to the rail 24 and located on the front side of the facsimile machine, and a pin 74 is fixed to the upright piece of the bracket 73. A stopper 76 is provided in which a long hole 75 is formed so that the pin 74 can slide freely. The tip of this stopper 76 is the bent part 7 that the bending part 71 and the hanger 72 can abut.
7, and a rounded portion 76a is formed at the rear end. Incidentally, reference numeral 78 designates a leaf spring for grounding the received image recording section 2 unit, and is set so that it is fixed to the bottom plate 25 and comes into contact with the rail 24. Therefore, although FIGS. 4 and 5 show the received image recording unit 2 unit in a stored state, when the unit is pulled forward, the hanger 72 engages with the bent portion 77 of the stopper 76 and moves as it is, resulting in a long Hole 75
moves until the right end touches the pin 74, and in this state the amount of withdrawal is regulated. Stopper 7 like this
6 moves a certain amount, the unit can be pulled out by a large amount, and the roll recording paper 16 can be easily replaced. Further, in order to completely pull out the unit, it is sufficient to raise the stopper 76 at an R-shaped portion 76a formed in a circular shape around the pin 74 in this state. Then, when the unit is pushed in, the bent portion 71 engages with the bent portion 77 and the stopper 76
It is stored in its original state while being moved.

Further, the rotary shaft 27 of the platen roller 19 is provided with a boss 80 having a cam 79 and a one-way clutch built therein. This one-way clutch does not transmit power when the rotating shaft 27 rotates clockwise, but transmits power when the rotating shaft 27 rotates counterclockwise, causing the cam 79 to rotate counterclockwise. Here, this cam 79 faces and contacts the roller 51 of the cutter lever 52, and in a normal state, the curved surface connecting the long diameter part 81 and the short diameter part 82 and the roller 51 have a positional relationship as shown in FIG. It has a notch 83 into which it is engaged. Further, a switch plate 84 that moves in conjunction with the cam 79 is provided, and a state switch 85 that is turned on and off by this switch plate 84 is provided. Therefore, the operation of cutting the roll recording paper 16 by the cutter 21 will be explained with reference to FIG. 9. First, when recording ends, the recording end position is set to platen roller 1.
Since the platen roller 19 is located directly below the platen roller 19 and the cutter 21, the platen roller 19 continues to rotate normally.
The roll recording paper 16 is fed by a distance of _L1 , and then fed by a constant length of _L2 . Here, this length L ₂
corresponds to the angle between the long diameter portion 81 and the notch 83 of the cam 79. Therefore, the pulse motor 30
When the platen roller 19 is reversed, the cam 79 rotates counterclockwise, and when the platen roller ₁₉ is reversed, the cam 79 rotates counterclockwise.
The movable blade 21A descends from the long diameter part 81 to the short diameter part 82, and the roll recording paper 1
Cut 6. Then, the cam 79 continues to rotate, and the roller 51 is pushed up according to the cam curve and is locked in the notch 83, so that the movable blade 21A returns and stops. At this time, the state switch 85 is turned from the ON state to the OFF state by the switch plate 84.
state, the pulse motor 30 switches to the state switch 8.
After 5 OFF, it stops after driving about 3 pulses. These three pulses are a margin for mechanical operation. Also,
Even after cutting by the cutter 21, the pulse motor 30 is rotating in reverse during this time, so the platen roller 19
Therefore, the length of the margin at the end of the roll recording paper 16 is
The roll recording paper ₁₆ is pulled back by a length _L3 , which is slightly shorter than L1, and the pulse motor 30 is stopped slightly forward of the position directly below the platen roller 19, so that the roll recording paper 16 is pulled back and stopped in a state where there is no leading edge margin. In this way, the cutter 21 operates and returns via the cam 79 based on the reverse rotation of the pulse motor 30, and no dedicated drive source is required.

Here, a leaf spring 86 for preventing the cam 79 from rotating quickly is in pressure contact with the boss 80. That is, since the boss 80 has a built-in one-way clutch, there is almost no resistance to the rotational force from the cam 79 side when the boss 80 rotates counterclockwise.
When the roller 51 is about to fall from the long diameter section 81 to the short diameter section 82, the cam 79 receives the force of this roller 51 and rotates quickly. Therefore, a pin 87 is provided on the boss 80 just before the short diameter part 82, and the pin 87 reaches the leaf spring 86 just before the roller 51 falls into the short diameter part 82 of the cam 79, increasing resistance and minimizing fast rotation. This is to keep it to a minimum. In this case, since almost no fast rotation force is applied when the cam 79 rotates normally, it is only necessary to increase the resistance using the pin 87 when the roller 51 falls. In this way, leaf spring 8
6 and the pin 87 on the boss 80 constitute a brake mechanism, which is advantageous over the pulse motor 30 because its braking force is weak under normal conditions. Particularly, when a load is required such as in the reset stroke of the cutter 21, the pulse motor 30 is advantageous because the braking force becomes weaker. Furthermore, since the brake is not structurally based on frictional force, it is advantageous in terms of durability.

Further, this cam 79 is provided with a mechanism for preventing reverse rotation when the unit is pulled out from the facsimile machine. That is, the leaf spring 86 is attached to a lever 89 which is rotatable by a fulcrum 88, a roller 90 located on the bracket 73 is provided at the lower end of this lever 89, and a stopper piece 91 is bent at the upper end side. It is formed. And this stopper piece 91 is attached to the boss 80.
A pin 92 is provided that can be engaged and disengaged. Therefore, when the received image recording section 2 unit is pulled out, the roller 90 comes off from the bracket 73, so that the leaf spring 8
The lever 89 rotates counterclockwise about the fulcrum 88 by the force of 6, and its stopper piece 91 engages with the pin 92. As a result, even if the operator carelessly attempts to reverse the cam 79 while the unit is pulled out, the cam 79 will not rotate, and the cutter 21 will not rotate.
will not operate, ensuring safety. Then, when the unit is pushed in, the roller 90 rides on the bracket 73, and the lever 89 is rotated back, so that the stopper piece 91 separates from the pin 92 and becomes ready for operation.

Furthermore, the paper ejection mechanism of the paper ejection roller 22 will be explained. First, both the upper roller 22A and the platen roller 19 are driven by the pulse motor 30, but the feeding force of the platen roller 19 is approximately 3.5 to 4 times that of the upper roller 22A, and the peripheral speed (rotation speed) is approximately 3.5 to 4 times that of the upper roller 22A.
Now, due to the relationship between the pulleys 32 and 35, the upper roller 22A
is approximately 1.4 times that of the platen roller 19.
A gear 95 is integrally provided on the shaft 34 of the upper roller 22A through a first one-way clutch 94 and a pulley 35 serving as a first driving means, and a gear 95 is connected through a second one-way clutch 96. gear 97
is provided. Furthermore, a gear 98 that meshes with this gear 97 and a gear 9 that meshes with gears 95 and 98.
9 is provided. Here, gears 95, 97,
Reference numerals 98 and 99 serve as reverse speed change means for relatively reversing the rotational direction of the paper ejection roller 22 and changing its circumferential speed. is configured. Further, the one-way clutch 9
4 and 96 are set to rotate the upper roller 22A only when gears 95 and 97 rotate clockwise, respectively. Therefore, when the platen roller 19 is rotated in the normal direction by the pulse motor 30, the gear 95 rotates in the normal direction, the one-way clutch 94 is activated, the upper roller 22A also rotates in the normal direction (clockwise), and the platen roller 19 rotates in the normal direction. and feed the paper. At this time, the number of rotations of the upper roller 22A is approximately 1.4 times that of the platen roller 19, the upper roller 22A is a metal roller and the lower roller 22B is a rubber roller, and the feeding force is approximately 1/3. There is no slack in the roll recording paper 16 between the platen roller 19 and the paper discharge roller 22. Further, since the driven upper roller 22A is a metal roller and is in contact with the back surface of the recording paper, no roller marks are left due to slippage. At this time, the gear 97 rotates in reverse as shown in FIG. On the other hand, when the pulse motor 30 reverses and the pulley 35 (gear 95) reverses, the one-way clutch 94 does not act, but the gears 95, 99, 98
As shown in FIG. 11b, the gear 97 rotates in the normal direction via the gear 97, and its one-way clutch 96 acts, causing the upper roller 22A to rotate in the normal direction as well. At this time, the platen roller 19 reverses and pulls back the roll recording paper 16, and the upper roller 22A and the lower roller 22B discharge the recording paper cut by the cutter 21. When the platen roller 19 reverses in this manner, the upper roller 22A rotates approximately 2.7 times the platen roller 19 depending on the ratio of the gears 95 and 97
It is set to rotate at twice the speed, and the cutter 2
While the leading edge of the previous roll recording paper 16 is being pulled back, the cut recording paper is securely transferred to the tray 2 at high speed.
The paper will be ejected onto 3.

As described above, the present invention provides a single drive source that rotates in forward and reverse directions, and the paper ejection roller is always rotated in a fixed direction regardless of whether this drive source is in the forward or reverse direction. Therefore, the device can be made compact and economical. At this time, the number of rotations of the paper ejection roller was changed depending on when the drive source rotates forward and reverse, so that the slack in the recording paper is eliminated during forward rotation, and the recorded recording paper is removed during reverse rotation. The paper can be reliably ejected at high speed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic side view of a facsimile device, Fig. 2 is a side view of the received image recording section, Fig. 3 is a side view of the received image recording section, and Fig. 4 is a side view of the facsimile device. 5 is a side view showing the transmission system of the drive source.
The figure is a plan view showing the drawer mechanism, Figure 6 is a plan view showing the cutter drive system, Figure 7 is a side view thereof, and Figure 8 is a plan view showing the cutter drive system.
The figure shows a side view when the reverse lock is activated, Figure 9 is a timing diagram showing the cutting operation, Figure 10 is a horizontal sectional view showing the transmission system on the paper ejection roller side, and Figures 11a and b show the operation of the gears. FIG. 16... Roll recording paper, 19... Platen roller (conveyance roller), 20... Recording head, 21...
... cutter, 22 ... paper ejection roller, 30 ... pulse motor (drive source).

Claims (1)

[Claims] 1 comprises a recording head, a conveyance roller that conveys a roll of recording paper, a cutter that cuts the recording paper after recording, and a paper discharge roller that discharges the recording paper,
In a recording device that discharges the recorded recording paper after cutting the recording paper and pulls back the unrecorded recording paper toward the recording head, the only driving source that drives the conveyance roller and the paper ejection roller in a forward and reverse direction. and,
A first drive means that connects the drive source and the paper ejection roller via a first one-way clutch that is in a power transmission state when the drive source rotates in the normal direction; a second driving means including a second one-way clutch speed change means provided between the driving source and the paper ejecting roller and which becomes in a power transmission state when the driving source reverses; The speed change ratio of the speed change means is set so that during reverse rotation, the paper discharge roller is rotated in the same direction as during normal rotation, and at a higher speed than during normal rotation.