JP2702269B2 - Recording paper conveying method and apparatus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for conveying a recording sheet, which is suitably implemented in a recording apparatus such as a facsimile apparatus.

2. Description of the Related Art In a conventional recording apparatus such as a facsimile apparatus, when exchanging recording paper due to running out of paper or the like, the recording paper cover 150 is opened as shown in FIG.
51 is stored in the storage space 152. Then, as shown in FIG. 28 (2), the leading end 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 of the recording paper guide 153, and is slightly pulled out from the end side of the recording paper guide 153.

In a so-called sub-frame type recording paper device,
As shown in FIG. 29 (1), the sub-frame 154 is opened, the rolled recording paper 151 is placed on the platen roller 155, and the recording paper is
The sub-frame 154 is locked as shown in FIG. 29 (2) so that the tip of the 151 is pulled out from the sub-frame 154. In the case of a recording apparatus with a cutter, the leading end of the recording paper 151 is passed through the gap between the cutter guides.

Problems to be Solved by the Invention In the above-described conventional technology, when replacing the recording paper, it is necessary to open the recording paper cover or to pass the leading end of the recording paper through a narrow gap, so that the recording paper can be quickly replaced. Could not be performed, which was inconvenient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording paper conveying method and apparatus capable of automatically conveying recording paper between a recording head and a platen simply by mounting a recording paper storage cassette in a recording apparatus main body. It is.

Means for Solving the Problems The present invention detects whether or not a recording paper storage cassette detachably mounted on a recording apparatus main body is mounted on the apparatus main body, and when the mounting of the recording paper storage cassette is detected, the recording head and the platen roller A recording paper conveyance method characterized by releasing a pressing state between the recording papers and driving a recording paper storage cassette by a motor for driving a platen roller to convey the recording paper in the recording paper storage cassette.

According to the present invention, there is provided a recording paper transport device for transporting a leading end of a recording paper between a recording head and a platen roller, wherein the recording paper is stored, is detachable from the recording device main body, and is driven by a platen roller driving motor. A paper storage cassette, a detecting means for detecting whether or not the recording paper storage cassette is mounted on the main body of the recording apparatus; and a recording paper storage cassette mounted on the main body of the recording apparatus in response to an output from the detecting means. Releasing means for releasing the pressed state between the recording head and the platen roller; and, in response to an output from the detecting means, when the recording paper storage cassette is mounted on the recording apparatus main body, the platen roller driving motor Transport means for driving the recording paper storage cassette to transport the recording paper in the recording paper storage cassette.

According to the present invention, when the recording paper storage cassette storing the recording paper is mounted on the recording paper device main body, the detection is detected by the detecting means. When the detection is detected, the pressing state between the recording head and the platen roller is released by the release means, and the recording paper in the recording paper storage cassette driven by the platen roller driving motor is conveyed.
Thereby, the leading end of the recording paper can be automatically conveyed between the recording head and the platen roller.

Embodiment FIG. 1 is a block diagram showing an electrical configuration of a facsimile apparatus 1 according to one embodiment of the present invention. A facsimile device 1 has a network control circuit 2 connected to a public telephone line l1.
Is provided. This network control circuit 2 is a telephone line.
The rotation control operation between the l1 and the facsimile machine 1 is performed. To the line network control circuit 2, a telephone means 4 for performing a telephone call provided with a handset 3 including a transmitter and a receiver is connected. The telephone means 4 is provided with a hook state detection circuit 5. 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 1 via the telephone line l1.

The control circuit 6 includes an operation unit 8 including a dial key and a start key, and a reading unit 9 for optically reading an image of a document loaded on the facsimile machine 1.
And a recording unit 10 for recording image data received via the telephone line l1 are connected to each other.

Document detection means 11 composed of a micro switch, etc.
Supplies a detection signal to the control circuit 6 upon detecting a document.
Similarly, a cam sensor 12 is provided in association with the recording means 10, and a cassette sensor 13 for detecting whether or not a recording paper cassette is attached is provided. These sensors 12, 13
The detection signal is given to the control circuit 6 respectively.

The recording paper sensor 14 is connected to a recording paper 24 shown in FIG.
Is detected. The jam detecting unit 15 detects a jam in which the recording paper 24 is wound around the platen roller. These sensors 14 and 15 are configured by a reflection type optical sensor or the like,
When detected, a signal is given to the control circuit 6.

At the time of reception, the control circuit 6 controls the reception driving motor 17 via the reception motor control circuit 16 to convey the recording paper. The control circuit 6 cuts the recording paper by activating the cutter 18 after recording the image data by the recording means 10 such as printing. At the time of transmission, the control circuit 6 rotates the transmission drive motor 20 forward 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 reversing the rotation at the time of reception.

The display means 21 is composed of a liquid crystal display device or the like, 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 formed at one end of a cabinet 23 of the facsimile apparatus 1 which is a recording apparatus main body, and a cassette 22 is detachably mounted.

In the cassette 22, as shown in FIG. 7, a recording paper 24 which is colored by heat and has a surface 24a on which recording can be performed is rolled and stored as a rolled recording paper 25. The roll-shaped recording paper 25 is held by a pair of spools 26a, 26b. One of the spools 26a is coaxially coupled to the spool driving gear 27. The leading edge of the recording paper 24
It is pulled out from the opening 28 of the cassette 22 to the recording means 10 side.
The cassette 22 can be opened at its upper part 22a, and the roll-shaped recording paper 25 can be replaced. Roll recording paper 25
In order to replace the cassette 22, 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 roll 29 formed of an elastic material such as rubber and for conveying the recording paper 24. The recording paper 24 is sandwiched between a platen roller 29 and a thermal head 30. In the thermal head 30, a plurality of heating elements 31 (see FIG. 3 described later) are arranged in the width direction of the recording paper 24 on the side facing the platen roller 29. Image data can be printed on the recording paper 24 by selectively energizing and heating the heating elements 31 in synchronization with the rotation of the platen roller 29 to convey the recording paper 24.

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

The platen roller 29 is rotated by driving a platen driving gear 37 fixed coaxially with the platen roller 29 from the receiving motor 17 (see FIG. 1) via a gear 36. The rotation of the gear 37 is transmitted to the spool driving gear 27 in the cassette 22 via the gear 38. The cassette 22 has an opening 22c for meshing the gear 38 and the gear 27 with each other.
Is provided. The cam shaft 35 is rotated by driving a cam driving gear 40 from the motor 20 (see FIG. 1) via a gear 39. A gear 40 is fixed to the camshaft 35 via a one-way clutch 41. The one-way clutch 41 is used to transmit the driving force to the camshaft 35 only when the motor 20 rotates in the reverse direction during transmission.

FIG. 3 is a cross-sectional view as seen from the direction of arrow A in FIG. To attach the cassette 22 to the cabinet 33,
The lower end 42 pivotally supports a projection 43 provided on the cabinet 33. Next, the upper end portion 44 of the cassette 22 is angularly displaced in the direction of arrow B, and a lock spring 46 provided on the cabinet 33 side is fitted and fixed to the lock support 45. When the cassette 22 is mounted on the cabinet 33, a signal is derived from the cassette sensor 13 constituted by a micro switch.

The leading edge of the recording paper 24 taken out from the roll-shaped recording paper 25 is
Platen roller 29 and thermal head via guide member 47
Guided between 30 and. A recording paper sensor 14 is provided along the guide member 47. The recording paper sensor 14 emits light along the optical axis 48 and detects reflected light to detect whether or not the recording paper 24 exists on the optical axis 48. The thermal head 30 is pressed against the platen roller 29 by the pressing cam 34 via the support plate 33 and the spring 32. Heating elements 31 are arranged in a portion where the thermal head 30 is pressed against the platen roller 29. The cam shaft 35 has a cam
A drive unit 49 is provided coaxially with 34. The driving member 49 is a cam
When the support plate 33 is pressed by 34, the cam sensor 12 constituted by a micro switch is activated. On the side facing the thermal head 30 via the platen roller 29,
A jam detecting unit 15 is provided, which includes a light reflection type sensor similar to the recording paper sensor 14.

FIG. 4 is a perspective view for explaining a pressing mechanism of the thermal head 30 in the recording means 10. The gear 39 is connected to the motor 20 (see FIG. 1). In the case of document feeding during transmission, the motor 20 rotates in the forward direction, the gear 39 rotates in the arrow C direction, and the cam 34 is driven. 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, when the gear 40 rotates in the direction of the arrow E, the cam shaft 34 does not rotate. When the motor 20 rotates in the reverse direction,
The gear 39 rotates in the direction of arrow D and the gear 40 rotates in the direction of arrow F, and the camshaft 35 rotates via the one-way clutch 41. The rotational position of the cam 34 is determined by the driving member shown in FIG.
It is detected by the cam sensor 12 via 49.

FIG. 5 shows the platen roller 29 and the rolled recording paper 25.
FIG. 4 is a perspective view showing a mechanism for driving to rotate. The gear 36 is connected to the motor 17 (see FIG. 1). From the gear 36, forward and reverse rotational forces from the motor 17 are transmitted to the platen driving gear 37, the gear 38, and the spool driving gear 27. The gear 37 is fixed to the rotation shaft. A platen roller 29 is connected to the rotation shaft. Gear 27
, A roll-shaped recording paper 25 is fixed via a spool 26a. Therefore, the platen roller 29 and the rolled recording paper 25 rotate with the forward / reverse rotation of the motor 17.

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

6 (1) shows that the motor 20 (see FIG. 1) drives the gear 39 in the direction of arrow G, drives the gear 40 in the direction of arrow H, and angularly displaces the cam 34 via the one-way clutch 41. This shows a state where the pressing on the support plate 33 is released. At this time, the roll-shaped recording paper 25 is in a stationary state.

FIG. 6 (2) shows that the motor 20 is stopped and the platen roller is stopped.
With the thermal head 30 pressed against 29 released,
The motor 17 (see FIG. 1) is driven to rotate in the forward direction,
To 38 and 27 are rotated in the directions of arrows I, J, K, and L, respectively, and the rolled recording paper 25 is rotated in the direction of the arrow M to feed the recording paper 24 toward the platen roller 29. Is shown. Since the pressing of the thermal head 30 is released, even when the recording paper 24 does not reach the platen roller 29, the platen roller 29 can be rotated while being in contact with the thermal head 30. The spool 26a and the roll-shaped recording paper 25 are connected by frictional force. Therefore spool 26
When a is rotationally driven, the roll-shaped recording paper 25 is also rotationally driven, and the recording paper 24 is sent to the platen roller 29. After the recording paper 24 reaches the platen roller 29, the recording paper 24 is transported by the platen roller.

FIG. 6 (3) shows that the recording paper 24 reaches a predetermined position by being nipped by the thermal head 30 and the platen roller 29,
The motor 17 is stopped, the motor 20 is rotated in the reverse direction, and the cam 34 is angularly displaced.
Shows a state where is pressed. Thus, the preparation for printing the image data on the recording paper 24 is completed.

FIG. 6 (4) shows a printing state when the diameter of the roll-shaped recording paper 25 is large. Since the platen roller 29 and the spool 26a are connected by a gear, the number of rotations has a fixed relationship. The relationship of this number of rotations is
When the diameter of 25 is large, its peripheral speed is set to be substantially equal to the peripheral speed of platen roller 29. Therefore, the tension applied to the recording paper 24 at this time is small.

FIG. 6 (5) shows a state where the recording paper 24 is used and the diameter of the roll-shaped recording paper 25 is small. At this time, the peripheral speed of the roll-shaped recording paper 25 is smaller than at the time of the large diameter. Therefore, the recording paper 24 is pulled by the platen roller 29, and a large tension is generated by the frictional force between the roll-shaped recording paper 25 and the spool 26a. Roll recording paper
When the diameter of 25 is small, the recording paper 24 is easy to curl, but if the tension can be applied in this way,
The curl can be corrected.

FIG. 6 (6) shows a state where printing is completed. Recording paper
24 is conveyed after printing is completed between the platen roller 29 and the thermal head 30, and is cut by the cutter 18. After this cutting, the motor 20 is reversed and the thermal head
The pressing of the platen roller 29 by 30 is released. The back surface 24b of the recording paper 24 shown in FIG.
When the mark 24c indicating the end of the recording paper provided in the recording paper 24 is detected, the motor 17 is rotated in the reverse direction, and the recording paper 24 is wound around the roll-shaped recording paper 25 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. Printing is performed as shown in (5). After the printing is completed, the pressing of the thermal head 30 against the platen roller 29 is released as shown in FIG. The release of the pressing is not limited to the reduction of the pressing force as in the present embodiment, but the thermal head 30 may be separated from the platen roller 29 as a matter of course.

FIG. 8 shows the rolled recording paper 25, the spool 26a and the gear 2
FIG. 9 is a sectional view showing the relationship of FIG. 7, and FIG. 9 is a perspective view of the spool 26a. On the inner peripheral side of the roll-shaped recording paper 25, a cylindrical core 25a is provided.
Is used. The transmission of the rotational force from the spool 26a to the core 25a is performed via a friction coupling portion 26c provided on the spool 26a. The friction coupling portion 26c is provided with a spring property so as to contact the inner peripheral surface of the core 25a. In this way, as shown by the solid line la in FIG. 10, the tension can be varied and applied in accordance with the diameter of the rolled recording paper 25. The dashed line lb in FIG. 10 shows that the roll-shaped recording paper 25 is simply spooled 26a, 26g without using the gear 27.
This is a change in the tension when rotatably held by b. In this embodiment, the tension changes greatly, and the curl of the recording paper can be easily corrected.

FIG. 11 is a flowchart for explaining a process until the recording paper 24 is set in a printable state. This flowchart corresponds to FIGS. 6 (1) to 6 (3). The control circuit 6 determines whether or not the cassette 22 is mounted on the basis of the output of the cassette sensor 13 from step m1 to step m2. When the cassette 22 is mounted, the process proceeds to Step m3.

Steps m3 to m10 correspond to the operation shown in FIG. In step m3, the cam sensor
The angular displacement position of the cam 34 is detected by 12. The cam sensor 12 is configured to conduct only when the micro switch detects that the cam 34 is in the pressed state. Therefore, when the cam sensor 12 does not conduct, the exact position of the cam 34 is unknown, and the process proceeds to step m4. In step m4, the motor 20 is reversed.
As the motor 20, a stepping motor is used.
When the pulse drive for reversing the motor 20 is performed,
In step m5, conduction / interruption of the cam sensor 12 is determined. When the cam sensor 12 is shut off, step m6
Then, the number of motor steps for reversing the motor 20 is compared with 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 proceeds to step m7, and the display means 21 displays a trouble. The number of motor steps 750 is
Is the number of steps required for one rotation, and if this value is exceeded, it is considered that some abnormality has occurred. When the cam sensor 12 is turned on in Step m3 or Step m5, the process proceeds to Step m8, and the motor 20 is rotated backward by 375 steps. This 375 steps is the number of steps required to rotate the cam shaft 35 by half, and the cam 34 is rotated half a turn from the pressed state. Next, in step m9, it is confirmed that the cam sensor 12 is shut off. Cam sensor
If 12 is still in the conductive state, it is abnormal, and a trouble display is performed in step m10.

Steps m11 to m16 correspond to FIG. 6 (2). In step m11, the motor 17 is rotated in the forward direction, the rolled recording paper 25 is rotated via the gear 27,
The recording paper 24 is fed out. The recording paper 24 is the guide member shown in FIG.
When the optical axis 48 of the recording paper sensor 14 is reached along 47, the recording paper
Since the rear surface 24b of the 24 is white, the reflected light to the recording paper sensor 14 increases, and the recording paper sensor 14 enters the recording paper detection state. When the recording paper sensor 14 is in the recording paper non-detection state in Step m12, the process proceeds to Step m13. Motor 17
Is also formed by a stepping motor, it is determined whether or not the number of motor steps exceeds 800. The value of the motor step number of 800 is a step number at which the recording sheet 24 pulled out from the opening 28 of the cassette 22 can sufficiently reach the optical axis 48 along the guide member 47. Therefore, when the number of motor steps exceeds this value,
The process proceeds to step m14, where a trouble is displayed. When it is confirmed in step m12 that the recording paper sensor 14 is in the recording paper detection state, the process proceeds to step m15, and the motor 17 is rotated in the forward direction by 1829 steps. As a result, the recording paper 24 is moved from the platen roller 29 to the thermal head 30.
Is fed out by a fixed amount.

Steps m16 to m19 correspond to FIG. 6 (3). In step m16, the motor 20 is rotated in the reverse direction, and the pressing of the thermal head 30 is started. In step m17, conduction / interruption of the cam sensor 12 is determined. When the cam sensor 12 is shut off, it is when the cam 34 is not at the position where the thermal head 30 is pressed, and in step m18,
The number of motor steps is compared to 750. The value of 750 is
As described above, this is the number of steps for the camshaft 35 to make one rotation, and when the number of steps is less than this value, the number of steps m1
Returning to 6, the motor 20 is further reversed. In step m18, if the number of motor steps exceeds 750,
At step m19, a trouble display is performed. If the cam sensor 12 is turned on in step m17, the thermal head 30 is pressed against the platen roller 29, and printing is performed in the next step m20.

In the present embodiment, the process enters the standby state at the stage when step m15 is completed, and is executed when printing is performed after step m16. Also, the numerical value shown as the number of motor steps is of course different 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 waits from step n1 to step n2 in a state where step m15 in the flowchart of FIG. 11 is completed. The standby state is continued until image data is received from the public telephone rotation l1 of FIG. 1 via the network control circuit 2 and the modem 7, or a copy request is made in the operation means 8. Here, copying means reading the original as image data by the reading means 9 and printing it on the recording paper 24 by the recording means 10. With this function, it is possible to confirm beforehand how to print the original before transmitting it. Step n3
In, when a signal requesting reception or copying is not detected, the process returns to step n2 and the standby state is continued.
When a signal requesting reception or copying is detected in step n3, the process proceeds to step n4. In step n4, the reverse rotation of the motor 20 is performed, the cam 34 is angularly displaced, and the thermal head 30 is pressed against the platen roller 29. Recording paper 24 is composed of thermal head 30 and platen roller 29
In step n5, the heating element 31 is driven, and printing is performed. In step n6, it is determined whether or not there is a print end instruction. If there is no print end instruction, the process returns to step n5, and printing is continued. The print end instruction in step n6 is sent to the control circuit 6
Is detected by detecting the 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 proceeds to step n7, in which the motor 20 is rotated in the reverse direction,
The pressing of the thermal head 30 against the platen roller 29 is released. Next, the process proceeds to step n8, where a standby state similar to step n2 is established.

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 nipped is maintained.
Therefore, the conveyance of the recording paper 24 by the rotation of the platen roller 29 is performed smoothly. In the standby state of Step n2 or Step n8, the thermal head 30
Of course, it may be configured so as to be apart from 29.

13 and 14 show another configuration for mounting the cassette 22. FIG. FIG. 13 is a perspective view showing a configuration on the cabinet 23 side. Fig. 14 shows the cassette 22 in the cabinet 23
It is sectional drawing which shows the state to which is attached. cabinet
A lock spring 46 is provided on the upper part of the 23, and a projection 43 is integrally formed on the lower part. Cabinet 23 has recording paper
An opening 50 for introducing 24 is provided. At the time of mounting, the cassette 22 and the cabinet 23 are joined by a flat side surface. The lower portion of the joint is pivotally supported by a projection 43 of the cabinet 23 in a recess provided at 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 bearing 45 is attached to the cabinet 23.

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

In the present embodiment, although the motor 20 for driving at the time of transmission is used in reverse for pressing the thermal head 30, another dedicated motor is provided, or another configuration using a plunger or the like is used. Of course, it is good. As in the present embodiment, by using the motor 20 in the reverse direction, it is possible to reduce the size and weight and reduce the manufacturing cost. Further, it is a matter of course that the platen roller 29 may be pressed against the thermal head 30 with the thermal head 30 fixed.

By providing the cassette 22 outside the cabinet 23, the exchange of the roll-shaped recording paper 25 can be performed quickly.

Furthermore, if a plurality of cassettes 22 are prepared, the recording paper
The time required to replace 24 can be further reduced,
The interruption time of the reception can be shortened when the recording paper 24 needs to be replaced during the reception of the image data to be printed. Further, since the recording paper 24 can be moved while being sandwiched between the thermal head 30 and the platen roller 29, preparation for movement can be simplified, and the paper can be used as it is after movement.

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 vicinity of an end of the platen roller 29 in FIG. In this embodiment, the release of the thermal head 30 and the roll-shaped recording paper 25 are controlled by one motor.
Is carried. Therefore, a motor 60 is provided instead of the transmission and reception motors 17 and 20 in the above-described embodiment. Further, the receiving motor 17 in the above-described embodiment
The gear 36 connected to 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. The gear 63 meshes with the gear 40 having the one-way clutch 41. The driving directions of the two one-way clutches 62, 41 are the same, that is, the one-way clutches 62, 41 are driven in the rotation direction E, and the driving force via the one-way clutch is cut off in the rotation direction F.

FIG. 18 is a diagram for explaining the operation of releasing the head of the recording paper transport mechanism in FIGS. 16 and 17. FIG. 18 (1) is a view as seen from one end of the platen roller 29 (the gear 63 side), and FIG. 18 (2) is a view as seen from the other end of the platen roller 29. When the cassette 22 is mounted on the apparatus main body, the motor 60 is driven in the reverse rotation direction, thereby
Rotates in the direction of arrow 65 as shown in FIG. 18 (1).
As a result, the gear 63 rotates in the direction of the arrow 66. Since the rotation direction 66 is different from the driving direction of the one-way clutch 62, the rotation driving force is not transmitted to the platen roller 29,
The platen roller 29 is stationary. Due to the rotation of the gear 63, the gear 40 rotates in the direction of arrow 67. This rotation direction 67
Is transmitted in the same direction as the driving direction of the one-way clutch 41, and is transmitted to the camshaft 35 via the one-way clutch 41. As a result, the cam 34 is angularly displaced, and 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 stopped 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 stationary.

FIG. 19 is a diagram showing a recording paper transport operation in the recording paper transport mechanism of FIGS. 16 and 17. FIG. 19 (1) is a view from one end of the platen roller 29, and FIG. 19 (2) is a view from the other end. In FIG. 18, after the thermal head 30 is released, the motor 60 is driven in the forward direction, whereby the gear 61 is driven in the direction of arrow 68. As a result, the gear 63 rotates in the arrow 69 direction. Since the rotation direction 69 is the same as the driving direction of the one-way clutch 62, the rotation force is transmitted to the platen roller 29 via the one-way clutch 62. By the rotation of the gear 63, the gear 40 rotates in the direction of the arrow 70. This rotation direction
Since 70 is in the opposite direction to the driving direction of the one-way clutch 41, the rotational driving force is not transmitted to the cam shaft 35. Therefore, the cam 34 remains stationary, that is, the head released state.

On the other hand, when the platen roller 29 rotates, the nineteenth
As shown in FIG. 2B, the gear 37 rotates in the direction of the arrow 71. This causes the gear 38 to rotate in the direction of the arrow 72 and the gear 27 to rotate.
Rotates in the direction of arrow 73. Thereby, the recording paper 25 is fed.

FIG. 20 is a diagram showing an operation of pressing the head 30.
In FIG. 19, the recording paper 25 is conveyed and the platen roller 29
When the motor 60 reaches a predetermined position between the motor 60 and the head 30, the motor 60 stops. Then, the motor 60 is again driven to rotate in the reverse direction. As a result, the gear 61 rotates in the direction of the arrow 65 shown in FIG. As a result, the roller 63 rotates in the direction of the arrow 66.At this time, since the rotation direction 66 is opposite to the driving direction of the one-way clutch 62 as described above, the rotational driving force is not transmitted to the platen roller 29, The platen roller 29 is in a stationary state. On the other hand, the rotation of the gear 63 causes the gear 40 to rotate in the arrow 67 direction. Since the rotation direction 67 is the driving direction of the one-way clutch 41 as described above, the rotation driving force is transmitted to the cam shaft 35, the cam 34 is angularly displaced,
The head 30 is pressed toward the platen roller 29 via 33.
As a result, the recording paper 25 is moved between the head 30 and the platen roller 29.
It is in a state of being sandwiched between. In such a state, since the platen roller 29 does not rotate, FIG.
The gear 37 is stationary as shown in FIG. Accordingly, the gear 38 and the gear 27 similarly remain stationary. Therefore, the recording paper 25 is in a stationary state. In this way, the leading end of the recording paper 25 is sandwiched between the head 30 and the platen roller 29, and the conveyance of the recording paper 25 is stopped, and preparation for printing image data on the recording paper 25 is completed. .

21 and 22 are diagrams showing the operation of the recording paper transport mechanism in FIGS. 16 and 17 during printing.
FIG. 21 shows a printing state when the diameter of the roll-shaped recording paper 25 is large, and FIG. 22 shows a printing state when the diameter of the roll-shaped recording paper 25 is small. As shown in FIG. 21 (1), during printing, the motor 60 is driven to rotate forward, the gear 61 rotates in the direction of arrow 68, and the platen roller 29 rotates in the direction of arrow 69. At this time, the cam shaft 35 does not rotate, and therefore, the head pressing state is maintained. Accordingly, the recording paper 25 is nipped between the head 30 and the platen roller 29 and is conveyed according to the rotation of the platen roller 29. On the other hand, as shown in FIG. 21 (2), the platen roller 29 and the spool 26a
Are connected by a gear, so that their rotation speeds have a certain relationship. When the diameter of the roll-shaped recording paper 25 is large, the peripheral speed of the platen roller
It is set to be almost equal to the peripheral speed of 29. Therefore,
At this time, the tension applied to the recording paper 24 is small.

On the other hand, when the recording paper 24 is used and the diameter of the roll-shaped recording paper 25 is
Is smaller than at the time of large diameter. Therefore, a large tension is applied to the recording paper 24 by the platen roller 29, and a large tension is generated by the frictional force between the roll-shaped recording paper 25 and the spool 26a. When the diameter of the roll-shaped recording paper 25 is small, the recording paper 24 easily curls, but if the tension can be applied in this way, the curl can be corrected.

FIG. 23 is a diagram showing a head releasing operation in a case where the recording paper 25 does not have a length capable of performing printing. Printing is completed, and the printed recording paper is
After the cutting, the motor 60 is reversed. As a result, the pressing of the thermal head 30 against the platen roller 29 is released.

In this way, the recording paper transport mechanism shown in FIGS.
Release the pressing state between the platen roller 30 and the platen roller 29, and
The leading end of the head 25 can be automatically conveyed between the platen roller 29 and the head 30, and then 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 released.

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 corresponding parts are denoted by the same reference numerals. In this embodiment, it is driven by a single motor 60. In this embodiment, the gear 39 and the gear 37 in the embodiment shown in FIG. 2 are omitted, and a gear 81 having a one-way clutch 80 is used instead of the gear 37. The gear 81 meshes with the gear 38, and the gear 38 meshes with the gear 27.
As shown in FIG. 25, the spool 26a in this embodiment is provided with a shaft portion 26a1 extending outward (to the left in FIG. 25). The gear 27 is rotatably mounted on the shaft 26a1 with respect to the shaft 26a1. A ratchet gear 90 is fixed to the end of the shaft 26a1 by a locking piece 91 at the end of the shaft 26a1. The ratchet gear 90 has a ratchet pawl 92
Are engaged. The ratchet pawl 92 is spring-biased by a spring 93 in a direction in which the ratchet pawl 92 engages the ratchet gear 90. A torsion spring 96 is interposed between the ratchet gear 90 and the gear 27. The torsion spring 96 is provided on the shaft 26a1.
Therefore, when the gear 27 rotates, the 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. FIG. 26 (1) shows a head released state, FIG. 26 (2) shows a recording paper feeding state, and FIG. 26 (3) shows a head pressed state. Referring first to FIG. 26 (1), when the cassette 22 is mounted on the apparatus main body, the motor
60 is driven in the reverse direction. Thus, 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 rotation direction 101 is opposite to the driving direction of the one-way clutch 80, the rotation driving force is not transmitted to the platen roller 29, and the platen roller 29 remains stationary. On the other hand, the rotation of the gear 81 causes the gear 40 to rotate.
Rotates in the direction of arrow 102. Since the rotation direction 102 is the driving direction of the one-way clutch 41, the rotation driving force is transmitted to the cam shaft 35, whereby the cam 34 is angularly displaced and the pressing force on the head 30 is released. Further, the rotation of the gear 81 causes the gear 38 to rotate in the arrow 103 direction. As a result, the gear 27 rotates in the arrow 104 direction. This rotation direction 104
In this case, since the ratchet gear 90 and the ratchet pawl 92 are locked, the spool 26a does not rotate, and thus the recording paper 25 is in a stationary state.

Next, referring to FIG. 26 (2), the motor 60 is stopped, and is thereafter driven to rotate in the normal rotation direction. This allows the gear 36
Rotates in the direction of arrow 105. Thus, the gear 81 rotates in the direction of the arrow 106. At this time, 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.
The rotation of the gear 81 causes the gear 40 to rotate in the direction of the arrow 107. At this time, the rotation direction 107 is
Since the driving direction is opposite to the first driving direction, the rotational driving force is not transmitted to the cam shaft 35, and therefore, the head released state is maintained. On the other hand, the rotation of the gear 81 causes the gear 38 to become an arrow.
The gear 27 rotates in the direction of arrow 109, thereby rotating in the direction of 108. By the rotation of the gear 27, a rotational driving force is transmitted to the ratchet gear 90 via the torsion spring 96. When the gear 90 rotates in the direction of the arrow 109, the ratchet gear 90 and the ratchet claw 92 are unlocked. Therefore, the ratchet gear 90 is allowed to rotate in the direction of the arrow 109, so that the spool 26a rotates in the direction of the arrow 109, whereby the paper feed of the rolled recording paper 25 is achieved.

The head pressing state will be described with reference to FIG. 26 (3). When the leading end of the recording paper 25 reaches a predetermined position between the head 30 and the platen roller 29, the motor 60 stops and is subsequently driven in the reverse rotation direction. This causes the gear 81 to rotate in the direction of arrow 101, and thus the platen roller 29 to rotate
35 does not rotate, and the head pressing state is maintained.

On the other hand, the rotation of the gear 81 causes the gear 27 to rotate in the arrow 104 direction via the gear 38. At this time, the ratchet gear 90 and the ratchet pawl 92 are locked. Therefore, the spool 26a does not rotate, and the conveyance of the recording paper 25 stops.

In this way, the printing preparation state can be achieved by the operations shown in FIGS. 26 (1) to (3). Fig. 26 (4)
FIG. 26 (5) is a diagram showing a printing operation. 26th
FIG. 4D shows a state where the diameter of the roll-shaped recording paper 25 is large, and FIG. 26 (5) shows a state where the diameter of the roll-shaped recording paper 25 is small. Similarly to the above-described embodiment, even in the configuration using the ratchet gear 90 and the ratchet claw 92, when the diameter of the roll-shaped recording paper 25 is large, the peripheral speed is substantially equal to the peripheral speed of the platen roller 29. It is set as follows. Therefore, at this time
The tension applied to 24 is small.

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

Next, the operation at the end of recording paper will be described with reference to FIG. 26 (6). When the recording paper end mark 24c of the recording paper 24 is detected, the motor 60 is reversed. As a result, the gear 81 rotates in the direction of arrow 101, whereby the rotation of the platen roller 29 stops. In addition, the gear 81
40 rotates in the direction of arrow 102. As a result, the cam shaft 35 rotates, and the cam 34 is angularly displaced. Therefore, the pressing force of the head is released.

On the other hand, the rotation of the gear 81 causes the gear 27 to rotate in the arrow 104 direction via the gear 38. 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 recording paper can be automatically conveyed also by the configurations shown in FIGS. 24 and 25. In addition,
Torsion spring 96, ratchet gear 90 and ratchet pawl 92
Instead, a one-way clutch may be used.

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 apparatus body. The rotation shaft of the auxiliary roller 110 includes
A gear 111 is fixed coaxially. The gear 111 meshes with a gear 37 provided in association with the platen roller 29. Therefore, when the platen roller rotates, the gear 37 and the gear 111
The driving force is transmitted through the auxiliary roller 110, and the auxiliary roller 110 rotates. On the other hand, a substantially L-shaped leaf spring 112 for applying a conveying force to the roll-shaped recording paper 25 is attached to the cassette 22. The leaf spring 112 comes into pressure contact with the surface of the auxiliary roller 110 when the cassette 22 is mounted on the apparatus main body. Therefore, when the platen roller 29 rotates, the auxiliary roll 11
A conveyance force is applied to the recording paper 25 between 0 and the leaf spring 112,
Thereby, the recording paper 25 can be transported.

In the above-described embodiment, the present invention is applied to the receiving unit of the facsimile apparatus as a recording apparatus, but it is needless to say that other various data recording apparatuses may be used.

As described above, according to the present invention, when the recording paper storage cassette is mounted on the apparatus main body, the pressing state between the platen roller and the recording head is released, and the recording paper is automatically driven by driving the platen roller driving motor. Thus, it is possible to convey between the platen roller and the recording head. Therefore, the recording paper exchange operation can be performed quickly and easily as compared with the related art. In addition, since the motor is also used, downsizing and cost reduction are possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a facsimile apparatus 1 according to one embodiment of the present invention, FIG. 2 is a perspective view showing a configuration relating to a recording means 10 and a cassette 22, and FIG. FIG. 4 is a perspective view showing a pressing mechanism for the thermal head 30, and FIG. 5 is a platen roller.
FIG. 6 is a perspective view showing a rotation driving mechanism of the recording paper 29 and the roll-shaped recording paper 25; FIG. 6 is a view for explaining the operation procedure of the present embodiment; FIG. 7 is a perspective view showing an end mark 24c of the recording paper 24;
FIG. 8 is a sectional view showing a drive mechanism of the rolled recording paper 25, FIG. 9 is a perspective view of the spool 26a, FIG. 10 is a graph showing tension acting on the recording paper 24, and FIGS. FIG. 13 is a flowchart for explaining the operation of the embodiment, and FIG.
FIG. 14 is a perspective view showing another configuration of the cabinet 23 for mounting the cassette 22, FIG. 14 is a cross-sectional view showing a state where the cassette 23 is mounted by the configuration shown in FIG. 13, and FIG. FIG. 16 is a perspective view of a one-motor type recording paper transport mechanism viewed from one side, and FIG.
16 is a perspective view of the embodiment shown in FIG. 16 as viewed from the other side, FIG. 18 is a diagram showing a head releasing operation in the embodiment shown in FIGS. 16 and 17, and FIG. 19 is a diagram showing FIGS. FIG. 20 is a diagram showing a state of recording paper feeding in the embodiment shown, FIG. 20 is a diagram showing a head pressing operation in the embodiment shown in FIGS. 16 and 17, and FIG. 21 is an embodiment in FIGS. 16 and 17 FIG. 22 is a view showing a printing state when the rolled recording paper is large in diameter, FIG. 22 is a view showing a printing operation when the recording paper is small in diameter in the embodiment shown in FIGS. 16 and 17, and FIG.
FIG. 24 is a view showing a head releasing operation in the embodiment shown in FIG. 17 and FIG. 17, FIG. 24 is a perspective view of still another embodiment of the recording paper transport mechanism, FIG. 25 is a sectional view of FIG. 24, and FIG. 24 is a view showing each operation of head release, recording paper feed, head pressing, printing operation, and head re-release operation in the embodiment shown in FIG. 27. FIG. 27 is a perspective view of still another embodiment of the recording paper transport mechanism, and FIG. FIG. 29 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 apparatus, 2 ... circuit 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 ... Roll recording paper, 26a, 26b ... Spool , 2
7,37,40,61,63,111 …… Gear, 29 …… Plateroller, 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, 112… leaf spring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03G 15/00 514 G03G 15/00 514

Claims (2)

(57) [Claims] The present invention detects whether or not a recording paper storage cassette detachable from a recording apparatus main body is mounted on the apparatus main body, and releases the pressing state between the recording head and a platen roller when the recording paper storage cassette is mounted. And a recording paper transporting method in which a recording paper storage cassette is driven by a motor for driving a platen roller to transport the recording paper in the recording paper storage cassette. 2. A recording paper transporting device for transporting a leading edge of a recording paper between a recording head and a platen roller, wherein the recording paper is stored, is detachable from the recording device main body, and is driven by a platen roller driving motor. A paper storage cassette, a detecting means for detecting whether or not the recording paper storage cassette is mounted on the main body of the recording apparatus; and a recording paper storage cassette mounted on the main body of the recording apparatus in response to an output from the detecting means. Releasing means for releasing the pressed state between the recording head and the platen roller; and, in response to an output from the detecting means, when the recording paper storage cassette is mounted on the recording apparatus main body, the platen roller driving motor Transport means for driving the recording paper storage cassette to transport the recording paper in the recording paper storage cassette.