JPH04145760A - Method and device for carrying recording paper - Google Patents

Abstract

PURPOSE:To rapidly execute the replacing work of recording paper by releasing the pressed state of a platen controller and a recording head when a recording paper storing cassette is loaded into a device body and carrying out recording paper from the cassette. CONSTITUTION:When the recording paper storing cassette 22 is loaded to a cabinet 33 to be the recording device body, the loading is detected by a cassette sensor 13. Thereby, the pressing state between a thermal head 30 and the platen roller 29 due to a spring 32 is reset and the head of the recording paper in the cassette 22 is automatically carried into the gap between the head 30 and the roller 29. Since the recording paper 24 can be automatically carried into the gap between the head 30 and the roller 29 only by loading the cassette 22 into the recording device body by this constitution, rapid recording paper replacing work can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording paper conveyance method and apparatus suitably implemented in a recording apparatus such as a facsimile machine.

2. Description of the Related Art In a conventional recording device such as a facsimile machine, when replacing the recording paper due to paper shortage, etc., the recording paper cover 150 is opened and the rolled recording paper 151 is stored, as shown in FIG. 28 (1). It is stored in the space 152. Then, as shown in FIG. 28(2), the leading edge of the recording paper 151 is set. That is, as shown in FIG. 28(3), the leading end of the recording paper 151 is inserted into the gap between the recording paper guides 153 and pulled out slightly from the terminal end of the recording paper guide 153.

Furthermore, in a so-called sub-frame type recording paper device, the sub-frame 154 is opened as shown in FIG. 29(1),
Rolled recording paper 151 is moved to platen roller 155. The subframe 154 is locked as shown in FIG. 29 (2) so that the leading edge of the recording paper 151 is pulled out from the subframe 154. In the case of a recording device equipped with a cutter, the leading edge of the recording paper 151 is passed between 1iJJj of the cutter guide.

Problems to be Solved by the Invention In the above-mentioned conventional technology, when replacing the recording paper, it is necessary to open the recording paper cover or pass the leading edge of the recording paper through a narrow gap, so it is difficult to quickly replace the recording paper. It was inconvenient because I couldn't do it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for conveying recording paper that allows recording paper to be automatically conveyed between a recording head and a platen simply by installing a recording paper storage cassette in a recording apparatus main body. It is.

Means for Solving the Problems The present invention detects that a removable recording paper storage cassette is attached to the main body of the recording apparatus, releases the pressing state between the recording head and the platen roller at the time of detection, and This is a recording paper transport method characterized in that the recording paper in a cassette is transported.

The present invention also provides a recording paper transport device that transports the leading edge of the recording paper between a recording head and a platen roller, including: a recording paper storage cassette that is detachably attached to the recording apparatus main body and stores the recording paper; a detection means for detecting that the recording head is attached to the recording apparatus main body; a means for releasing the pressing state between the recording head and the platen roller in response to the output from the detection means; and a means for responding to the output from the detection means. This is a recording paper conveyance device characterized in that it includes means for transporting recording paper in a recording paper storage cassette.

Function According to the present invention, when a recording paper storage cassette containing recording paper is installed in the recording paper apparatus main body, this is detected by the detection means. As a result, when the pressing state between the recording head and the platen roller is released, the recording paper in the cassette is conveyed. This allows the leading edge of the recording paper to be automatically conveyed between the recording head and the platen roller.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of a facsimile machine W1 according to an embodiment of the present invention. Facsimile machine 1
includes a line network control circuit 2 connected to a public telephone line 11.
is provided. This line network control circuit 2 performs a line control operation between the telephone line 11 and the facsimile machine 1. This line network control circuit 2 is equipped with a handset 3 including a transmitter and a handset. Telephone means 4
is connected. The telephone means 4 includes a hook state detection circuit 5.
is provided. The hook state detection circuit 5 is connected to a control circuit 6 composed of a microcomputer or the like.

A modem 7 is provided between the control circuit 6 and the wiring network control circuit 2. The modem 7 modulates and demodulates a carrier signal transmitted/received by the facsimile machine t1 via the telephone line 11.

The control circuit 6 also includes an operation means 8 including a dial key and a start key, and a reading means 9 for optically reading an image of a document loaded in the facsimile machine 1.
telephone line! A recording means 10 for recording image data received via 1 is connected to each of the recording means 10 .

A document detecting means 11 composed of a microswitch or the like provides a detection signal to the control circuit 6 when detecting a document. Similarly, a cam sensor 12 is provided in association with the recording means 10, and a cassette sensor 13 is provided for detecting whether or not a recording paper cassette is attached. These sensors 12.1
3 supplies detection signals to the control circuit 6, respectively.

The recording paper sensor 14 is connected to the Nc! The presence or absence of the record registration 4 is detected. The jam detection means 15 detects a jam in which the recording paper 24 wraps around the platen roller. These sensors 14 and 15 are comprised of reflective optical sensors and the like, and provide signals to the control circuit 6 when detected.

At the time of reception, the control circuit 6 receives the received motor control diagram I@16.
The receiving drive motor 17 is controlled via the receiving drive motor 17 to convey the recording paper. The control circuit 6 records the image data by printing or the like using the recording means 10, and then activates the cutter 18 to cut the recording paper. During transmission, the control circuit 6 rotates the transmission drive motor 20 in the forward direction via the transmission motor control circuit 19 to convey the document. The motor 20 is also used for printing in the recording means 10 by rotating it in reverse during reception.

The display means 21 is comprised of a liquid crystal display device or the like, and is provided near the operation means 8, and the control circuit 6 displays information including various trouble displays.

FIG. 2 is a perspective view showing the configuration of the recording means 10 and the cassette 22. The recording means 10 is a facsimile device 1
The cassette 22 is detachably attached to the cabinet 23 at one end of the cabinet 23.

In the cassette 22, as shown in FIG. 7, a roll of recording paper 24 is stored as a roll of recording paper 25, which is colored by heat and has a surface 24a on which recording can be performed. The rolled recording paper 25 is attached to a pair of spools 2.
6a, 26b. One spool 26
a is coaxially coupled to the spool drive gear 27.

The leading end of the recording paper 24 is pulled out to the recording means 10 side through the opening 28 of the cassette 22. The cassette 22 can be opened at its upper part 22a, and the rolled recording paper 25 can be replaced. To replace the rolled recording paper 25,
A configuration in which the side 22b of the cassette 22 is opened on the other spool 26b side can also be used.

The recording means 10 is provided with a platen roller 29 made of an elastic material such as rubber for conveying the recording paper 24. The recording paper 24 is held between a platen roller 29 and a thermal head 30. In the thermal head 30, a plurality of heating elements 31 (see FIG. 3, which will be described later) are arranged in the width direction of the recording paper 24 on the side facing the platen roller 29. In synchronization with rotating the platen roller 29 to convey the recording paper 24, the heating element 31 is selectively energized and heated, thereby conveying the recording paper 24.
Image data can be printed on 4.

The thermal head 30 is pressed against the platen roller 29 by a spring 32. The spring 32 is supported by a support plate 33, and the pressing force is adjusted by a pressing cam 34.The six pressing cams 34 are three cams having the same shape connected by a cam shaft 35.

The platen roller 29 is connected to the receiving motor 17 (see FIG. 1).
The platen driving gear 37, which is fixed coaxially with the platen roller 29, is driven through the gear 36, thereby rotating. The rotation of the gear 37 is transmitted via the gear 38 to the gear 27 for driving the spool inside the cassette 22. The cassette 22 is provided with an opening 22c for causing the gear 38 and the gear 27 to mesh with each other. The camshaft 35 is rotated by a cam driving gear 4o being driven by the motor 20 (see FIG. 1) via a gear 39.

A gear 4o is fixed to the camshaft 35 via a one-way clutch 41. The one-way clutch 41 is used to transmit driving force to the camshaft 35 only when the motor 20 rotates in the opposite direction to the transmission direction.

FIG. 3 is a sectional view taken from the direction of arrow A in FIG.

To attach the cassette 22 to the cabinet 33,
The upper end portion 44 of the cassette 22, whose lower end portion 42 is pivotally supported on a protrusion 43 provided on the cabinet 33, is angularly displaced in the direction of arrow B, and the lock receiving portion 45 is attached to the cabinet 33.
A lock spring 46 provided on the side is fitted and fixed.

When the cassette 22 is installed in the cabinet 33, the cassette sensor 13 consisting of a micro switch is activated.
A signal is derived from.

The leading end of the recording paper 24 taken out from the roll of recording paper 25 is guided between the platen roller 29 and the thermal head 30 via the guide member 47 . Along the guide member 47,
A recording paper sensor 14 is provided. The recording paper sensor 14 is
By emitting light along the optical axis 48 and detecting the reflected light, it is detected whether the writing paper 24 is present on the optical axis 48. The thermal head 30 is pressed against the platen roller 29 by a pressing cam 34 via a support plate 33 and a spring 32. A heating element 31 is provided at the portion where the thermal head 30 is pressed against the platen roller 29.
are arranged. A driving member 49 is provided on the camshaft 35 coaxially with the cam 34 . The driving member 49 is the cam 34
is pressing against the support plate 33, activates the cam sensor 12 constituted by a microswitch. On the side facing the thermal head 30 via the platen roller 29, a jam detection means 15 is provided, which is constituted by a light reflection type sensor similar to the recording paper sensor 14.

FIG. 4 shows a thermal head 30 in the recording means 10.
FIG. 3 is a perspective view for explaining the pressing mechanism of FIG. The gear 39 is connected to the motor 20 (see FIG. 1), and in the case of document feeding during transmission, the motor 20 rotates in the forward direction, the three gears rotate in the direction of arrow C, and the cam 34 rotates in the direction of arrow C. Drive gear 40
rotates in the direction of arrow E. At this time, since the one-way clutch 41 is provided, no driving force is transmitted from the gear 40 to the camshaft 35. That is, the gear 40 is aligned with the arrow E.
When rotating in the direction, the camshaft 34 does not rotate. When the motor 20 rotates in the opposite direction, the three gears rotate in the direction of the arrow mark, the gear 40 rotates in the direction of the arrow F, and the camshaft 35 rotates via the one-way clutch 41. cam 3
4 is detected by the cam sensor 12 via the drive member 49 shown in FIG.

FIG. 5 shows the platen roller 29 and the rolled recording paper 2.
FIG. Gear 36 is connected to motor 17 (see FIG. 1). From the gear 36, the forward and reverse rotational forces from the motor 17 are transmitted to the platen driving gears 37 and 38 and the spool driving gear 27. Gear 37 is fixed to the rotating shaft. A platen roller 29 is coupled to the rotating shaft. The gear 27 is connected via a spool 26a.
A roll of recording paper 25 is fixed. Therefore, as the motor 17 rotates forward and backward, the platen roller 29 and the rolled recording paper 25 rotate.

FIG. 6 is a diagram for explaining the operation procedure in this embodiment.

In FIG. 6(1), the motor 20 (see FIG. 1) is connected to the gear 39.
is driven in the direction of arrow G, the gear 40 is driven in the direction of arrow H, the cam 34 is angularly displaced via the one-way clutch 41, and the pressure on the support plate 33 is released. The recording paper 25 is in a stationary state.

FIG. 6(2) shows that the motor 17 (see FIG. 1) is rotated in the forward direction with the motor 20 stopped and the pressure of the thermal head 30 against the platen roller 29 released.
The gears 36 to 38 and 27 are rotated in the directions of arrows I, J, and L, respectively, and the rolled recording paper 25 is rotated in the direction of arrow M.
Since the pressure of the thermal head 30, which indicates the state in which the recording paper 24 is sent toward the platen roller 29 by rotating the recording paper 24 in the The platen roller 29 can be rotated while in contact with the head 30.

The spool 26a and the rolled recording paper 25 are coupled by frictional force. Therefore, when the spool 26a is rotationally driven, the rolled recording paper 25 is also rotationally driven, and the recording paper 24 is sent toward the platen roller 29. Recording paper 2
4 reaches the platen roller 29, the recording paper 24
is conveyed by a platen roller.

FIG. 6(3) shows that the recording paper 24 is held between the thermal head 30 and the platen roller 29 and reaches a predetermined position, the motor 17 is stopped, the motor 20 is reversed, the cam 34 is angularly displaced, and the platen roller 29 is held between the recording paper 24 and the platen roller 29. A state in which the thermal head 30 is pressed against the roller 29 is shown. In this way, preparations for printing image data on the recording paper 24 are completed.

FIG. 6(4) shows the printing state when the diameter of the rolled recording paper 25 is large. Platen roller 29 and spool 26
Since it is connected to a by a gear, the rotational speed thereof has a certain relationship. This rotation speed relationship is set so that when the diameter of the rolled recording paper 25 is large, its circumferential speed is approximately equal to the circumferential speed of the platen roller 29. Therefore, the tension applied to the recording paper 24 at this time is small.

FIG. 6(5) shows a state in which the recording paper 24 is used and the diameter of the rolled recording paper 25 is small.The circumferential speed of the rolled recording paper 25 at this time is smaller than when the diameter is large. Become. Therefore, the recording paper 24 is pulled by the platen roller 29, and the rolled recording paper 25 and spool 26a
A large tension force is generated by the frictional force between the two. When the diameter of the rolled recording paper 25 is small, the recording paper 24 tends to curl, but if a strong tension can be applied in this way, the curling can be corrected.

FIG. 6 (6) shows a state in which printing is completed.

The recording paper 24 is transferred to the platen roller 29 and the thermal head 3.
After printing is completed between 0 and 0, the paper is conveyed and cut by the cutter 18. After this cutting, the motor 20 is reversed, and the pressure of the thermal head 30 against the platen roller 29 is released. When the recording paper sensor 14 detects a mark 24C provided on the back surface 24b of the recording paper 24 shown in FIG. It is taken and stored in the cassette 22.

In this embodiment, when image data is to be printed on the recording paper 24, the thermal head 30 is pressed against the platen roller 29 as shown in FIG. 6(3), and as shown in FIG. 6(4) and FIG. Printing is performed as shown in (5). After printing is completed, the pressure on the platen roller 29 by the thermal head 30 is released as shown in FIG. 6(6). Such release of the pressing force is not only a reduction in the pressing force as in this embodiment, but also a reduction in the thermal head 30.
Of course, it is also possible to separate the platen roller 29 from the platen roller 29.

FIG. 8 is a cross-sectional view showing the relationship between the roll-shaped recording paper 25, the spool 26a, and the gear 27, and FIG. 9 is a perspective view of the spool 26a. A core 25a is used. The rotational force is transmitted from the spool 26a to the core 25a via a frictional coupling portion 26c provided on the spool 26a. Frictional joint 26
c is provided with spring properties so as to come into contact with the inner circumferential surface of the core 25a. By doing so, the tension can be applied while changing greatly, as shown by the solid line 1a in FIG. 10, depending on the diameter of the rolled recording paper 25. What is shown by the broken line 1b in FIG. 10 is the change in tension when the rolled recording paper 25 is simply held rotatably by the spools 26a and 26b without using the gear 27. In this embodiment, the change in tension is shown in FIG. is large, making it easy to correct curls on recording paper.

FIG. 11 is a flow chart for explaining the process up to setting the recording paper 24 in a printable state. This flowchart corresponds to FIG. 6(1) to FIG. 6(3). The control circuit 6 performs steps m1 to m2.
At this point, it is determined based on the output of the cassette sensor 13 whether or not the cassette 22 is attached. When the cassette 22 is installed, the process moves to step m3.

Step m3 to step mlo correspond to the operation shown in FIG. 6(1). In step m3, the angular displacement position of the cam 34 is detected by the cam sensor 12.

The cam sensor 12 is connected to the cam 3 by a microswitch.
4 is configured to be electrically conductive only when it is detected that it is in a pressed state. Therefore, when the cam sensor 12 is not conductive, the exact position of the cam 34 is unknown, so the process moves to step m4. In step m4, the motor 20 is reversed. A stepping motor is used as the motor 20. When the pulse drive for reversing the motor 20 is performed, it is determined in step m5 whether the cam sensor 12 is conductive or disconnected. When the cam sensor 12 is cut off, the process moves to step m6, and the motor 20
The number of motor steps to reverse is compared to 750. When the number of motor steps is 750 or less, the process returns to step m4. When the number of motor steps exceeds 750, the process moves to step m7, and a trouble display is displayed on the display means 21. The motor step number 750 is the number of steps required for one rotation of the camshaft 35, and if this value is exceeded, it is assumed that some abnormality has occurred. When the cam sensor 12 force is conductive in step n3 or step m5, the process moves to step m8 and the motor 20 force is reversed by 375 steps. This 375 strokes is the necessary number of steps to rotate the camshaft 35 by half, and the cam 34 is rotated by half a rotation from the pressing state force.

Next, in step m9, it is confirmed that the force l sensor 12 is shut off.

If the cam sensor 12 remains in a conductive state, it is an abnormality, and therefore a true 2 error display is performed in step mlo.

From step mll to step m16 is shown in Figure 6 (2)
corresponds to In step mll, the motor 17 is rotated in the forward direction, and the rolled recording paper 25 is rotated through the gear 27.
is rotated, and the recording paper 24 is fed out. When the recording paper 24 reaches the optical axis 48 of the recording paper sensor 14 along the guide member 47 shown in the third figure, since the back surface 24b of the recording paper 24 is white, the reflected light to the recording paper sensor 14 increases, and the recording The paper sensor 14 enters the recording paper detection state. step m12
When the recording paper sensor 14 is in the recording paper non-detection state, the process moves to step m13. Since the motor 17 is also constituted by a stepping motor, it is determined whether the number of motor steps exceeds 800. The value of 800 motor steps corresponds to the opening 2 of the cassette 22.
The number of steps is sufficient for the recording paper 24 pulled out from the guide member 47 to reach the optical axis 48.

Therefore, when the number of motor steps exceeds this value, the process moves to step m14 and a trouble display is performed.

When it is confirmed in step m12 that the recording paper sensor 14 is in the recording paper detection state, step m15
Then, the motor 17 is rotated by 1829 steps in the forward direction. As a result, steps m16 to m19 in which the recording paper 24 is fed by a certain amount between the platen roller 29 and the thermal head 30 are shown in FIG.
). In step m16, the motor 20 is reversed and pressing of the thermal head 30 is started. In step m17, it is determined whether the cam sensor 12 is conductive or disconnected. When the cam sensor 12 is cut off, it is when the cam 34 is not in a position to press the thermal head 30.
In step m18, the number of motor steps is compared with 750. The value 750 is the camshaft 3 as mentioned above.
5 is the number of steps for one rotation, and when the number of steps is less than this value, the process returns to step m16, and the motor 20 is further reversed. When the number of motor steps exceeds 750 in step m18, a trouble display is performed in step m19. step m1
When the cam sensor 12 becomes conductive in step 7, the thermal head 30 becomes a pressing layer against the platen roller 29, and printing is performed in the next step m20.

In this embodiment, the printer enters a standby state when step m15 is completed, and steps m16 and subsequent steps are executed when printing is performed. Of course, the numerical value shown as the number of motor steps varies depending on the number of teeth of each gear.

FIG. 12 is a flowchart for explaining the printing operation in this embodiment. The control circuit 6 performs step n1
Then, in step n2, the process waits in the state where step m15 in the flowchart of FIG. 11 has been completed. Public telephone line 11, line network control circuit 2 and modem 7 in FIG.
The standby state continues until image data is received via the operating means 8 or a copy request is made through the operating means 8.

Here, copying refers to reading the original as image data by the reading means 9 and printing it on the recording paper 24 by the recording means 1o.By this function, it is possible to determine in advance how the original will be printed before sending it. It can be confirmed. In step n3, if a signal requesting reception or copying is not detected, the Stellar 7n2 returns to continue the standby state. When a signal requesting reception or copying is detected in Stellar 7n3, step n
Move on to 4. In step n4, the motor 20 is reversely rotated, angularly displacing the cam 34, and causing the thermal head 30 to
is pressed against the platen roller 29. With the recording paper 24 being pressed and held between the thermal head 30 and the platen roller 29, the heating element 31 is activated in step n5.
is driven and printing is performed. In step n6, it is determined whether there is an instruction to end printing. If there is no instruction to end printing, the process returns to step n5 and printing is continued.

The instruction to end printing in step n6 is given by the control circuit 6 detecting an end signal of the received image data or by detecting the end of the image data to be copied. When an instruction to end printing is issued in step n6, the process moves to step n7, where the motor 20 is rotated in the opposite direction and the pressure of the thermal head 30 against the platen roller 29 is released. Next, proceed to step n8, and step n
It enters a standby state similar to 2.

In this embodiment, although the pressing force of the thermal head 30 against the platen roller 29 changes due to the angular displacement of the cam 34, the state in which the recording paper 24 is held between them continues. Therefore, the recording paper 24 is smoothly conveyed by the rotation of the platen roller 29. In the standby state of step n2 or step n8, the thermal head 30
Of course, it is also possible to configure the platen roller 29 to be separated from the platen roller 29.

13 and 14 show other configurations for mounting cassette 22. FIG. FIG. 13 is a perspective view showing the configuration of the cabinet 23 side, and FIG. 14 is a perspective view showing the configuration of the cabinet 23 side.
FIG. 3 is a cross-sectional view showing a state in which a cassette 22 is attached to the cassette 22 . A lock spring 46 is provided at the top of the cabinet 23, and a protrusion 43 is integrally formed at the bottom. The cabinet 23 has an opening 5 for introducing the recording paper 24.
0 is set. At the time of installation, the cassette 22 and the cabinet 23 are joined at their planar side surfaces. The lower part of the joint is pivoted by a projection 43 of the cabinet 23 into a recess provided in the lower end 42 of the cassette 22. The upper end 44 of the cassette 22 is fixed by a lock spring 46 whose lock receptacle 45 is attached to the cabinet 23 .

FIG. 15 shows another configuration for conveying the recording paper 24. In FIG. A curl correction plate 51 bent in an inverted V shape is provided on the way from the rolled recording paper 25 to the platen roller 29. By providing such a curl correction plate 51, the curl of the recording paper 24 can be sufficiently corrected.

In this embodiment, in order to press the thermal head 30, the motor 20 for driving during transmission is reversed and used, but other configurations such as providing a separate dedicated motor or using a plunger or the like may be used. Of course, by using the motor 20 in the reverse direction as in this embodiment, it is possible to reduce the size and weight and the manufacturing cost. In addition, the thermal head 30 is fixed and the platen roller 29 is moved to the thermal head 30.
Of course, it is also possible to press it against.

By providing the cassette 22 outside the cabinet 23, the rolled recording paper 25 can be replaced quickly.

Furthermore, if multiple cassettes 22 are prepared, the time required to replace the recording paper 24 can be further reduced, and when the need arises to replace the recording paper 24 in the middle of receiving image data to be printed. It is possible to shorten the reception interruption time.

Further, since the recording paper 24 can be moved while being held between the thermal head 30 and the platen roller 2, preparations for movement can be made simple, and the recording paper 24 can be used as is after being moved.

FIG. 16 is a perspective view of another recording paper transport mechanism of the present invention, and FIG. 17 is a perspective view of the platen roller 2 in FIG.
9 is a perspective view of the vicinity of the end portion of FIG. In this embodiment, one motor releases the thermal head 30 and transports the rolled recording paper 25. Therefore, a motor 60 is provided in place of the transmitting and receiving motors 17 and 20 in the embodiments described above. Furthermore, the gear 36 connected to the receiving motor 17 in the previous embodiment is omitted.

The driving force from the motor 60 is transmitted to the gear 61. This gear 61 meshes with a gear 63 having a one-way clutch 62. This gear 63 is the one-way clutch 4
The driving directions of the two one-way clutches 62, 41 that mesh with the gear 40 having the rotation direction E are the same, that is, the driving direction of the one-way clutches 62, 41 is in the rotational direction E, and the one-way clutch 62.41 is in the rotational direction F. The driving force via is cut off.

FIG. 18 is a diagram for explaining the operation of releasing the head of the recording paper transport mechanism shown in FIGS. 16 and 17. FIG. 18th
Figure (1) shows one end side of the platen roller 29 (gear 63 side)
FIG. 18 (2) is a view of the platen roller 2.
9 as seen from the other end side. When the cassette 22 is attached to the main body of the apparatus, the motor 60 is driven in the reverse direction, thereby rotating the gear 61 in the direction of arrow 65, as shown in FIG. 18(1). This causes the gear 63 to move to the arrow 6
Rotates in 6 directions. Since this rotational direction 66 is different from the driving direction of the one-way clutch 62, the rotational driving force is not transmitted to the platen roller 29, and the platen roller 29 is stationary. The rotation of gear 63 causes gear 40 to rotate in the direction of arrow 67. Since this rotational direction 67 is the same as the driving direction of the one-way clutch 41, it is transmitted to the camshaft 35 via the one-way clutch 41. As a result, the cam 34 is angularly displaced and becomes in a state where the pressing force on the support plate 33 is released.

On the other hand, since the platen roller 29 is stationary, the gear 37 is also stationary, as shown in FIG. 18(2). Therefore, the gear 38 and the spool driving gear 27 are also stopped, and the recording paper 25 is also in a stationary state.

FIG. 19 is a diagram showing a recording paper conveying operation in the recording paper conveying mechanism of FIGS. 16 and 17. FIG. Figure 19 (
1) is a view seen from one end side of the platen roller 29;
FIG. 19(2) is a view seen from the other end side. In FIG. 18, after the thermal head 30 is released,
The motor 60 is driven in the forward rotation direction, thereby causing the gear 61
is driven in the direction of arrow 68. With this, the gear 63
rotates in the direction of arrow 69. Since this rotational direction 69 is the same as the driving direction of the one-way clutch 62, the rotational force is transmitted to the platen roller 29 via the one-way clutch 62. The rotation of gear 63 causes gear 40 to rotate in the direction of arrow 70.

Since this rotational direction 70 is opposite to the driving direction of the one-way clutch 41, no rotational driving force is transmitted to the camshaft 35. The lick cam 34 remains stationary, ie, the head is released.

On the other hand, as the platen roller 29 rotates, the first
As shown in FIG. 9(2), the gear 37 rotates in the direction of arrow 71. As a result, gear 38 rotates in the direction of arrow 72, and gear 27 rotates in the direction of arrow 73. As a result, the recording paper 25 is fed.

FIG. 20 is a diagram showing the operation of pressing the head 30. In FIG. 19, the recording paper 25 is transported and when it reaches a predetermined dark position between the platen roller 29 and the head 30, the motor 60 is stopped. Then, the motor 60 is driven in reverse again. As a result, the gear 61 rotates in the direction of the arrow 65 shown in FIG. 20(1), and the roller 63 rotates in the direction of the arrow 66.
6 is in the opposite direction to the driving direction of the one-way clutch 62, so rotational driving force <y is not transmitted to the platen roller 29, and the platen roller 29 is in a stationary state. On the other hand, the rotation of gear 63 causes gear 40 to rotate in the direction of arrow 67. Since this rotational direction 67 is the driving direction of the one-way clutch 41 as described above, the rotational driving force is transmitted to the camshaft 35, the cam 34 is angularly displaced, and the head 30 is moved to the platen roller 29 via the support plate 33. (Press Ill.

As a result, the recording paper 25 is held between the head 30 and the platen roller 29rr. Note that in this state, since the platen roller 29 does not rotate,
The gear 37 remains stationary as shown in FIG. 20(2). Therefore, gear 38 and gear 27 also remain stationary. Therefore, the recording paper 25 is in a stationary state. In this way, the leading edge of the recording paper 25 is aligned with the head 3.
0 and the platen roller 29, the conveyance of the recording paper 25 becomes stationary, and preparation for printing image data on the recording paper 25 is completed.

FIGS. 21 and 22 are diagrams showing the operation of the recording paper transport mechanism in FIGS. 16 and 17 during printing. FIG. 21 shows the printing state when the diameter of the rolled recording paper 25 is large, and FIG. 22 shows the printing state when the diameter of the rolled recording paper 25 is small. Figure 21 1
), the motor 60 is driven in normal rotation during printing,
The gear 61 rotates in the direction of arrow 68, and the platen roller 29
rotates in the direction of arrow 69. In addition, at this time, the camshaft 35
does not rotate, and therefore the head remains pressed. Therefore, the recording paper 25 is held between the head 30 and the platen roller 29 and is conveyed as the platen roller 29 rotates.

On the other hand, as shown in FIG. 21 (2), the platen roller 2
Since the spool 26a and the spool 26a are connected by gears, their rotational speeds have a certain relationship. This rotation speed relationship is set so that when the diameter of the rolled recording paper 25 is large, its circumferential speed is approximately equal to the circumferential speed of the platen roller 29. Therefore, the tension applied to the recording paper 24 at this time is small.

On the other hand, in the state shown in FIG. 22 where the recording paper 24 is used and the diameter of the rolled recording paper 25 is small, the circumferential speed of the rolled recording paper 25 is smaller than when the diameter is large. Therefore, a large tension is applied to the recording paper 24 by the platen roller 29, and the rolled recording paper 25 and spool 26a
A large tension force is generated by the frictional force between the two. When the diameter of the rolled recording paper 25 is small, the recording paper 24 tends to curl, but if a strong tension can be applied in this way, the curling can be corrected.

FIG. 23 is a diagram showing the head release operation when the length of the recording paper 25 is not long enough to print. After printing is completed and the printed recording paper is cut by the cutter 18, the motor 60 is rotated in reverse. As a result, the pressure of the thermal head 30 against the platen roller 29 is released.

In this way, the single motor 60 also releases the pressing state between the head 30 and the platen roller 29 by the recording paper transport mechanism shown in FIGS. 2 rollers and 3 heads
After the head is automatically conveyed during the zero period, the head can be pressed again to be ready for printing. Further, when the recording paper 25 is no longer long enough to perform printing due to the use of the recording paper, the head can be brought into a released state.

FIG. 24 is a perspective view of a recording paper transport mechanism according to still another embodiment of the present invention, and FIG. 25 is a sectional view thereof. This embodiment is similar to the previous embodiment and is driven by a single motor 60, in which corresponding parts bear the same reference numerals. In this embodiment, the gears 39 and 37 in the embodiment shown in FIG.
7, a gear 81 having a one-way clutch 80 is used. This gear 81 meshes with the gear 38
spool 2 in this embodiment meshes with gear 27
6a, as shown in FIG. 25, is provided with a shaft portion 26a1 extending outward (left side in FIG. 25). A gear 27 is mounted on the shaft portion 26a1 so as to be rotatable with respect to the shaft portion 26a1. A ratchet gear 90 is fixed to the shaft portion 26a1 by a locking piece 91 at the end of the shaft portion 26a1. A ratchet pawl 92 is engaged with the ratchet gear 90. This ratchet pawl 92 is biased by a spring 93 in the direction of engagement with the ratchet gear 90. A torsion spring 96 is interposed between the ratchet gear 90 and the gear 27. This torsion spring 96 is externally mounted on the shaft portion 26a1. Therefore, when the gear 27 rotates, rotational driving force is transmitted to the ratchet gear 90 via the torsion spring 96.

FIG. 26 is a diagram showing the operation of the recording paper transport mechanism shown in FIGS. 24 and 25. 26(1) shows the head released state, FIG. 26(2) shows the recording paper feeding state, FIG. 26(3) shows the head pressed state, and FIG.
Referring to 1), when the cassette 22 is attached to the main body of the apparatus, the motor 60 is driven in the reverse direction. As a result, the gear 36 is driven to rotate in the direction of arrow 100, and the gear 81 is driven to rotate in the direction of arrow 101. At this time, since the rotational direction 101 is opposite to the driving direction of the one-way clutch 80, no rotational driving force is transmitted to the platen roller 29, and the platen roller 29 remains stationary. On the other hand, due to the rotation of the gear 81, the gear 40 moves to the arrow 102.
Rotate in the direction.

Since this rotational direction 102 is the driving direction of the one-way clutch 41, the rotational driving force is transmitted to the camshaft 35,
As a result, the cam 34 is angularly displaced and the pressing force on the head 30 is released. Also, due to the rotation of the gear 81, the gear 3
8 rotates in the direction of arrow 103. With this, gear 2
7 rotates in the direction of arrow 104. In this rotational direction 104, the ratchet gear 90 and the ratchet pawl 92 are in a locked state, so the spool 26a does not rotate, and therefore the recording paper 25 remains stationary.

Next, referring to FIG. 26(2), the motor 60 is stopped,
Thereafter, it is rotated in the normal rotation direction. This causes the gear 36 to rotate in the direction of arrow 105.

As a result, the gear 81 rotates in the direction of arrow 106, and since the rotation direction 106 is the driving direction of the one-way clutch 80, the rotational driving force is transmitted to the platen roller 29, and the platen roller 29 rotates. Also, gear 8
1 rotates the gear 40 in the direction of arrow 107. At this time, the rotation direction 107 is the one-way clutch 41
Since the driving direction is opposite to the driving direction, the rotational driving force is not transmitted to the camshaft 35, and therefore the head released state is maintained. On the other hand, the rotation of the gear 81 causes the gear 38 to rotate in the direction of the arrow 108, which causes the gear 27 to rotate in the direction of the arrow 108.
Rotate in direction 09. As the gear 27 rotates, rotational driving force is transmitted to the ratchet gear 90 via the torsion spring 96. When gear 90 rotates in the direction of arrow 109,
The ratchet gear 90 and the ratchet pawl 92 are unlocked. Therefore, the ratchet gear 90
is allowed to rotate in the direction of arrow 109, and therefore the spool 26a rotates in the direction of arrow 109.

As a result, paper feeding of the rolled recording paper 25 is achieved.

The head pressing state will be explained with reference to FIG. 26(3). The leading edge of the recording paper 25 is connected to the head 30 and the platen roller 29.
When the motor 60 reaches the predetermined position 1 in between, the motor 60 stops and is subsequently driven in the reverse rotation direction. This causes the gear 81 to move to arrow 1.
Therefore, although the platen roller 29 rotates, the cam 35 does not rotate, and the head pressing state is maintained.

On the other hand, due to the rotation of the gear 81, the gear 27 is transferred via the gear 38 to the gear 27.
When the ratchet gear 90 rotates in the direction of arrow 104, the ratchet gear 90 and the ratchet pawl 92 are in a locked state. Therefore, the spool 26a does not rotate, and the conveyance of the recording paper 25 is stopped.

In this way, the print preparation state can be achieved by the operations shown in FIGS. 26(1) to (3).

FIG. 26(4) and FIG. 26(5) are diagrams showing the printing operation. FIG. 26(4) shows a state in which the diameter of the rolled recording paper 25 is large, and FIG. 26(5) shows a state in which the diameter of the rolled recording paper 25 is small. Similarly to the above-mentioned embodiment, in the configuration using such a ratchet gear 90 and ratchet pawl 92, when the diameter of the rolled recording paper 25 is large, its circumferential speed is approximately equal to the circumferential speed of the platen roller 29. It is set as follows. Therefore, the tension applied to the recording paper 24 at this time is small.

On the other hand, when the recording paper 24 is used and the diameter of the rolled recording paper 25 becomes smaller, the circumferential speed of the rolled recording paper 25 becomes smaller than when the diameter is large. Therefore, similarly to the above embodiment, when the diameter of the rolled recording paper 25 is small, a strong tension can be applied, and the curl can be corrected.

Next, referring to FIG. 26 (6), the operation when the recording paper ends will be explained. Recording paper end mark 24c on recording paper 24
When the motor 60 is detected, the motor 60 is reversed. This causes the gear 81 to rotate in the direction of arrow 101, thereby stopping the rotation of the platen roller 29. Furthermore, the rotation of the gear 81 causes the gear 40 to rotate in the direction of the arrow 102. This causes the camshaft 35 to rotate and the cam 34 to undergo angular displacement.

Therefore, the pressing force of the head is released.

On the other hand, due to the rotation of the gear 81, the gear 27 is transferred via the gear 38 to the gear 27.
rotates in the direction of arrow 104. However, in this case,
Since the ratchet gear 90 and the ratchet pawl 92 are in a locked state, the spool 26a is not driven.

In this manner, the configurations shown in FIGS. 24 and 25 also allow the recording paper to be automatically conveyed. Note that a one-way clutch may be used in place of the torsion spring 96, ratchet gear 90, and ratchet pawl 92.

FIG. 28 is a perspective view showing the configuration of still another embodiment of the recording paper transport mechanism. An auxiliary roller 110 is attached to the equipment main body side. A gear 111 is coaxially fixed to the rotating shaft of this auxiliary roller 110. This gear 11
1 is a gear 3 provided in relation to the platen roller 29;
It meshes with 7.

Therefore, when the platen roller rotates, driving force is transmitted through the gear 37 and the gear 111, and the auxiliary roller 110 rotates. On the other hand, a roughly L-shaped leaf spring 112 is attached to the cassette 22 for applying a conveyance force to the rolled recording paper 25. This leaf spring 112 is connected to the cassette 22
When mounted on the main body of the apparatus, it comes into pressure contact with the surface of the auxiliary roller 110.

Therefore, when the platen roller 29 rotates, a conveyance force is applied to the recording paper 25 between the auxiliary roller 110 and the leaf spring 112, and thereby the recording paper 25 can be conveyed.

In the embodiments described above, the present invention is applied to the receiving section of a facsimile machine as a recording device, but it can be applied to other various data recording devices! Of course, it may be possible.

Effects of the Invention As described above, according to the present invention, when a recording paper cassette is installed in the main body of the apparatus, the pressing state between the platen roller and the recording head is released, and the recording paper is automatically moved between the platen roller and the recording head. It becomes possible to transport to. Therefore, recording paper replacement work can be performed more quickly than in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a facsimile machine 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing the configuration related to the recording means 10 and the cassette 22, and FIG. 4 is a perspective view showing the pressing mechanism of the thermal head 30, FIG. 5 is a perspective view showing the rotational drive mechanism of the platen roller 29 and the rolled recording paper 25, and FIG. 7 is a perspective view showing the end mark 24C of the recording paper 24, FIG. 8 is a sectional view showing the drive mechanism for the rolled recording paper 25, and FIG. The figure is a perspective view of the spool 26a, FIG. 10 is a graph showing the tension acting on the recording paper 24, FIGS. 11 and 12 are flowcharts for explaining the operation of this embodiment, and FIG. 13 is the attachment of the cassette 22. FIG. 14 is a perspective view showing another configuration of the cabinet 23 for
FIG. 15 is a cross-sectional view showing a state in which the cassette 23 is installed with the illustrated configuration. FIG. 15 is a diagram showing another configuration for curl correction of the recording paper 24. FIG. 16 is one side view of a one-motor type recording paper conveyance mechanism. A perspective view from the side, Figure 17 is the first
6 is a perspective view of the embodiment shown in FIG. 6, FIG. 18 is a diagram showing the bed release operation in the embodiment shown in FIGS.
7 is a diagram showing the recording paper feeding state in the embodiment shown in FIG. 7, FIG. 20 is a diagram showing the head pressing operation in the embodiment shown in FIGS. 16 and 17, and FIG.
7 is a diagram showing the printing state when the rolled recording paper in the illustrated embodiment has a large diameter, and FIG. 22 is similar to FIGS. 16 and 17.
A diagram showing the printing operation when the recording paper has a small diameter in the illustrated embodiment, FIG. 23 is a diagram showing the head release operation in the embodiment illustrated in FIGS. 16 and 17, and FIG. 24 shows further details of the recording paper conveyance mechanism. FIG. 25 is a perspective view of the embodiment of
4 is a sectional view, FIG. 26 is a diagram showing the head release, recording paper feeding, head pressing, printing operation, and head re-release operation in the embodiment shown in FIG. 24, and FIG. 27 is a diagram showing the recording paper transport mechanism. A perspective view of still another embodiment, FIG. 28 is a diagram showing the operation of the first conventional example, and FIG. 29 is a diagram showing the operation of the second conventional example. 1...Facsimile machine, 2...Line network control circuit,
6... Control circuit, 7... Modem, 12... Cam sensor, 13... Cassette sensor, 14... Recording sensor, 15... Jam detection means, 17.20.60--
Motor, 22... Cassette, 24... Recording paper, 25
...Rolled recording paper, 26a, 26b-spool, 27
, 37° 40.61, 63.111... Gear, 29...
Platen roller, 30... Thermal head, 31...
・Heating element, 32. Spring, 33. Support plate, 34 Cam, 35. Cam shaft, 41.62 80. One-way clutch, 90. Ratchet gear, 93.96.
Coil spring, 110... Auxiliary roller,] 12... Leaf spring agent Patent attorney Number of strokes Keiichi part figure figure figure figure figure figure figure figure 1 Otonowa sticky stopper figure 10 figure 12 figure figure figure! Figure 27Figure 29

Claims (2)

[Claims] (1) Detects that a removable recording paper storage cassette is attached to the recording device main body, and upon detection, releases the pressure between the recording head and platen roller, and transports the recording paper in the cassette. A recording paper conveyance method characterized by: (2) In the recording paper transport device that transports the leading edge of the recording paper between the recording head and the platen roller, there is a recording paper storage cassette that is detachable from the recording apparatus body and stores the recording paper, and a recording paper storage cassette that is used for recording. a detection means for detecting that the recording head is attached to the apparatus main body; a means for releasing the pressing state between the recording head and the platen roller in response to an output from the detection means; and a means for releasing the pressing state between the recording head and the platen roller in response to an output from the detection means. 1. A recording paper conveying device comprising means for conveying recording paper in a recording paper storage cassette.