JPS648950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recording paper loading device in an apparatus that uses continuous paper as recording paper, such as a facsimile recording unit or a printer.

[Prior art]

Conventionally, in facsimile machines, etc., it is necessary to set a roll of recording paper in a storage section and then pass the recording paper through a narrow recording paper path where a recording head, cutter section, feed roller section, etc. are arranged. However, when setting the recording paper, it must be visually checked to see if it is in the correct position. However, it is generally difficult to visually see the recording paper path due to structural limitations, and it is difficult to reliably determine the setting position.

[Purpose of the invention]

An object of the present invention is to reliably determine the initial setting position of recording paper when loading the recording paper.

[Embodiments of the invention]

An embodiment of the present invention will be described based on the drawings. The present embodiment relates to a facsimile machine, and the inside of a housing 1 is divided by a housing stay 2 which also serves as a scanner base, with a transmitting section 3 provided above and a receiving section 4 provided below.

Therefore, the upper surface of the housing 1 has a document table 5.
The document table 5 is provided with a document guide 6. A separating section 8 consisting of a pressure plate, a paper stopper, a separating pressure adjustment pin, a separating rubber, etc. is provided on the upper part of the separating roller 7.
A contact glass 11 is provided immediately in front of the contact glass 11. A light source 12 for document illumination and an inclined mirror 13 are provided below the contact glass 11, and a lens 14 is provided on the right end side facing the mirror.
and a solid-state imaging scanning element 15.

Next, in the center of the receiving section 4, a roll paper storage section 16 is provided. This roll paper storage section 16 has a roll paper storage box 19 that is provided so as to be movable back and forth by a slide rail 17 and an auxiliary rail 18. Circular flange portion 2 of roll paper holder 21 that holds paper 20
Two holder placement stays 23 for receiving 2 are provided. In addition, the roll paper storage box 1
9 has an upper opening notch 25 that allows the roll paper knob 24 of the roll paper holder 21 to protrude forward.
is formed, and at the upper corner in the feeding direction,
A feed roller 26 and a hand cutter 27 are provided.

A guide 28 is bent into an L-shape to face the hand cutter 27, and below the guide 28, a platen roller 29 which also serves as a conveyance roller and a thermal head 30 which serves as a recording head are connected to each other. It is set in. A cutter 32 is attached to a guide plate 31 that is expanded toward the thermal head 30 side. That is, this cutter 32 has a fixed blade 33.
and a rotating movable blade 34. A paper feed roller 35 consisting of a pair of rollers is provided on the discharge side of the cutter 32. A first recording paper detection sensor 121 that mechanically or photoelectrically detects the presence or absence of the recording paper 20 is provided on the front side of the thermal head 30, and a second recording paper detection sensor 121 is provided on the exit side of the cutter 32. Detection sensor 12
2 is provided.

Although not particularly shown, a front door is provided on the front of the casing 1 so that it can be opened and closed, and an external switch 123 is provided inside the casing 1, which is turned on and off by opening and closing the front door.

Next, as shown in FIG. 16, a controller 124 consisting of a CPU or the like is provided, and an input port 126 and an output port 127 are connected to this controller 124 via a bus line 125. The first recording paper detection sensor 121, the second recording paper detection sensor 122, and the external switch 123 are connected to the input port 126. Further, a gate circuit 128 is connected to the output port 127, and this gate circuit 128
An amplifier 129 and a speaker 130 are connected to the output side of the amplifier 129 and a speaker 130. Connected to the input side of the gate circuit 128 are an oscillator 1131 as a recording paper detection notification means that determines the signal sound of the sound generating section, and an oscillator 2132 as a warning notification means that determines the sound of the warning section.

Next, based on Figures 2 to 8, record paper 2
The path of 0 and its movement will be explained. First, the guide 28 facing the hand cutter 27 consists of an upper guide plate 36 and a lower guide plate 37. This guide 28 is bent along the curl direction of the recording paper 20, and the lower guide plate 37 The upper guide plate 36 is formed short so as to extend close to the introduction part 38 between the platen roller 29 and the thermal head 30.
An opening 39 is formed between the opening 39 and the opening 39.

What is shown in FIG. 3 is a part of the apparatus shown in FIG. 1 seen from the rear side, and FIG. 4 is a plan view thereof. First, the drive pulley 42 and platen pulley 43 of the motor 41, which is a stepping motor attached to the back plate 40, are connected to the transmission belt 4.
Connected by 4. This platen pulley 4
3 is integrally connected to the platen roller 29, and a delivery pulley 46 around which a delivery transmission belt 45 is wound is also integrally connected to the platen roller 29. This platen roller 2
9 is provided with a platen gear 47 via a one-way clutch so that power is transmitted only when the platen roller 29 rotates clockwise, and a switch plate 48 and a cutter cam 49 are integrated. A cutter gear 50 is provided on the platen roller 29 with a one-way clutch interposed therebetween. Idler gears 51 and 52 are provided that mesh with the platen gear 47 and the cutter gear 50, respectively, and the platen roller 29
The cutter gear 50 is meshed so that the rotational speed of the cutter gear 50 is increased relative to the rotational speed of the cutter gear 50 . The switch plate 48 also has one recess 5 on its circumference.
3 is formed and the cutter position switch 54
The actuator is provided to engage and disengage.

Next, a cutter bracket 57 biased clockwise by a tension spring 56 is fixed to the support shaft 55.
A cutter cam follower 58 is attached to the cutter bracket 57 and is in contact with the cutter cam 49 whose outer periphery is formed in a spiral shape. The movable blade 34 is fixed to the support shaft 55. Further, the protruding piece 5 of the cutter bracket 57
A cutter stopper 60 is provided, with which the cutter stopper 9 abuts and its maximum rotation angle is set.

Next, what is shown in FIG. 5 is the drive system for the paper feed roller 35, and its direction is seen from the rear side as in FIG. 3. First, the feed-out transmission belt 45 is wound around the body of a gear 51, and this gear 61 is attached to the shaft portion 62 of the paper feed-out roller 35 with a one-way clutch 63 interposed therebetween. That is, when the gear 61 rotates clockwise, power is not transmitted to the shaft portion 62, and when the gear 61 rotates counterclockwise, the power is not transmitted to the shaft portion 62.
Power is transmitted to. The gear 61 is meshed with an idler gear 64, another idler gear 65 is meshed with this idler gear 64, and this idler gear 65 is connected to a one-way clutch 66.
It is meshed with a gear 67 attached to the shaft portion 62 via. This gear 67 does not transmit power to the shaft portion 62 when rotating clockwise,
It transmits power when rotating counterclockwise.

Therefore, the feeding state of the recording paper 20 is such that printing is performed while the recording paper 20 is being fed by the rotation of the platen roller 29, and after being cut by the cutter 32, a margin portion corresponding to the distance between the cutting position and the printing section is cut. In order to reduce the amount, the recording paper 20 is returned by a predetermined size, and at the same time, the recording paper 20 beyond the cutter 32 is ejected by the paper feed roller 35.

This state will be described with reference to FIGS. 3 to 8, but since the orientation is opposite to that shown in FIG. 2, the rotation direction will be explained in the opposite direction. First, when the platen pulley 43 is rotated counterclockwise by the motor 41, the platen gear 47 does not rotate, and the platen roller 29 rotates counterclockwise to feed the recording paper 20 in the forward direction. At the same time, the gear 61 rotates counterclockwise via the feed transmission belt 45, thereby causing the paper feed roller 35 to rotate counterclockwise to feed the paper. This state is the state shown in FIG. 7, in which the gear 6 is
7 rotates clockwise, but the one-way clutch 66
Due to this, it is idly rotating between the shaft portion 62 and the shaft portion 62.

Then, when the motor 41 reverses, the platen roller 29 reverses and spreads the recording paper 20, and at the same time the cutter cam follower 58 moves the cutter cam 4.
9, and the cutter bracket 57 is rotated until the protrusion 59 comes into contact with the stopper 60 due to the tension of the tension spring 56. As a result, the movable blade 34 cuts the recording paper 20.

Further, the reverse rotation of the motor 41 continues until the unrecorded portion at the leading end of the cut recording paper 20 reaches a predetermined length. At this time, the gear 61 is driven clockwise, but the one-way clutch 63 does not transmit driving force to the shaft portion 62, and the idler gears 64, 6
5, the gear 67 rotates counterclockwise, and thereby the paper feed roller 35 rotates counterclockwise. As a result, the cut and printed recording paper 20 is discharged.

However, if we look back at FIG. 2 to see how the recording paper 20 is returned, normally the platen roller 29
The feed roller 26 is reversed by the returning force of
The recording paper 20 is slackened in the roll paper storage section 16. However, when the rigidity of the recording paper 20 is low, when the load on the feed roller 26 is large, when the load on the guide 28 is large, the recording paper 20 deforms into a V-shape at the opening 39 as shown in the figure. Since this deformation direction coincides with the curl direction of the recording paper 20, the deformation occurs at the opening 39.
This easily occurs in the environment, so it does not cause jamming. Furthermore, since the deformation position is near the platen roller 29 that generates a feeding force on the recording paper 20, the movement when forward feeding is performed again is good. Further, when the recording paper 20 is inserted, since the leading edge of the recording paper 20 is curled in the direction of contacting the lower guide plate 37, even if the opening 39 exists, the recording paper 20 is reliably guided to the introduction section 38.

Next, the movement of each component on the path of the recording paper 20 will be explained based on FIGS. 9 and 10.
First, a detection plate fulcrum shaft 69 is rotatably suspended between the back plate 40 and a front plate 68 facing the back plate 40 at a predetermined interval. This detection plate fulcrum shaft 69 is located at the upper right of the roll paper storage section 16, and a recording paper remaining amount detection plate 70 that is in contact with the outer peripheral surface of the recording paper 20 held by the roll paper holder 21 is fixed in the middle part. A V-shaped reset lever 71 located in front of the front plate 68 is fixed to the front end. This reset lever 7
An operation knob 72 is attached to one end of 1.
Furthermore, a cam 7 is provided at the rear end of the detection plate fulcrum shaft 69.
3 is fixed, and a remaining amount detection switch 74 that is opened and closed by this cam 73 is provided.

Next, a press arm fulcrum shaft 7 is provided between the front plate 68 and the back plate 40 at the upper left side.
5 is suspended over the press arm fulcrum shaft 75, and a head reset arm 76 extending above the reset lever 71 is fixed to the front end of the press arm fulcrum shaft 75. A pair of press arms 77 are fixed to the front and rear of the press arm fulcrum shaft 75 with screws 78. Pressing protrusions 79 extending rearward are integrally formed at the upper ends of these press arms 77, and the lower ends are biased clockwise by a tension spring 80. Further, a head hanger fulcrum shaft 81 is attached to the lower part of the press arm 77. A relay arm 82 is fixed to the press arm fulcrum shaft 75 with an adjustment screw 83 so that the angle can be adjusted freely. Further, a head hanger 84 is rotatably attached to the head hanger fulcrum shaft 81, and a tension spring 85 is attached between the head hanger 84 and the relay arm 82 to bias it counterclockwise. Such a head hanger 84 is formed with an engagement recess 86 that opens upward.

Next, a head bracket 87 for holding the thermal head 30 is provided, and head fulcrum shafts 88 and 89 are fixed to the front and rear ends of the head bracket 87 so as to be located on the same axis. The head fulcrum shaft 88 on the rear end side is fitted into the back plate 40, which serves as a bearing holding portion, so as to move in the axial direction thereof, and the head fulcrum shaft 89 is attached to the front plate 68, which serves as a bearing holding portion, by a nut 90. It is mounted so that it does not move in the axial direction, but rotates freely in the rotational direction. Arm hangers 91 are formed to protrude laterally from both sides below the head bracket 87, and these arm hangers 91 are engaged with the engagement recesses 86 of the head hanger 84. In this engaged state, the thermal head 30 is positioned so as to be joined to the platen roller 29 via the recording paper 20, but when the engagement with the engagement recess 86 is released, the thermal head 30 is set so that it separates from the platen roller 29 due to its own weight.

Next, an idler roll 92 is provided below the paper feed roller 35 so that its axis can be freely moved up and down and is constantly pressed against the paper feed roller 35 by a ring spring 93. A feed-out roller reset lever 94 whose lower end is joined to the shaft portion of the idler roll 92 is attached so as to be movable up and down. It is located at the bottom.

Although the state shown in FIG. 9 is a normal set state, the reset lever 71 is positioned by the recording paper remaining amount detection plate 70 coming into contact with the recording paper 20. In this position, the roll paper storage box 19 cannot be pulled out, and the reset lever 71 functions as a safety guard. In this state, when the remaining amount of recording paper 20 reaches a predetermined state,
This means that the detection plate fulcrum shaft 69 has rotated significantly,
The cam 73 interferes with the remaining amount detection switch 74 to turn it on and generate a signal indicating that the recording paper 20 should be replenished.

In this way, when replenishing the recording paper 20, hold the operation knob 72 and release the reset lever 71.
Turn it clockwise. As a result, the reset lever 71 pushes up the head reset arm 76, and is positioned by the stop piece 95 bent at the end of the head reset arm 76 and comes to rest. This rotation of the reset lever 71 causes the remaining recording paper amount detection plate 70 to move away from the roll paper holder 21, and the reset lever 71 is retracted from the front of the roll paper holder 21, thereby allowing it to be pulled out. Also, as a result of the rotation of the head reset arm 76, the press arm fulcrum shaft 7
5, the press arm 77 is rotated counterclockwise. As a result, the head hanger fulcrum shaft 81
The head hanger 84 supported by the arm presses the arm hanger 91 and rotates the head bracket 87 counterclockwise. This allows thermal head 3
0 is moved away from the platen roller 29 to allow the recording paper to freely pass through this portion. Further, as a result of the press arm 77 rotating counterclockwise, the pressing protrusion 79 moves the feed roller reset lever 94
Press down. As a result, the idler roll 92
moves downward to widen the distance from the paper feed roller 35, allowing the recording paper 20 to pass freely.

In this way, by rotating the reset lever 71 counterclockwise, the roll paper holder 21 can be pulled out, and the recording paper remaining amount detection plate 7
0 reset, thermal head 30
releasing the contact between the platen roller 29 and the platen roller 29;
The four operations of releasing the recording paper 20 from the paper feed roller 35 are performed simultaneously. Therefore, the recording paper 20 left inside can be easily taken out, and the roll paper holder 21 can also be taken out and a new recording paper 20 can be set easily.

Also, when the reset lever 71 is returned to its original position,
Due to its own weight, the recording paper remaining amount detection plate 70 is joined to the outer peripheral surface of the recording paper 20, the thermal head 30 is also returned to its original position by the force of the tension spring 80, and the idler roll 92 is also returned to its original position by the force of the ring spring 93.

Therefore, it is necessary to remove the thermal head 30 for maintenance reasons. In this case, first push down the head hanger 84. As a result, this head hanger 84 is attached to the tension spring 8.
5 and releases the engagement with the arm hanger 91. As a result, the head bracket 87 hangs down about the head fulcrum shafts 88 and 89. In this state, when the nut 90 is removed and the head bracket 87 is moved in the direction of the back plate 40, the head fulcrum shaft 89 on the near side will move towards the back plate 6.
It deviates from 8. Next, the head fulcrum shaft 89
By pulling the head bracket 87 toward the front to a position where it will not interfere with the front plate 68, the head fulcrum shaft 88 will come out of the rear plate 40, and the head bracket 87 will be removed with the thermal head 30 attached. is removed. As a result of removing the thermal head 30 in this way, the space in the center becomes larger, making maintenance of each part easier and allowing the thermal head 30 to be removed.
Converting 0 itself is also easy.

Although the installation of the thermal head 30 is performed by performing the reverse operation, even after reassembly, if the position of the thermal head 30 with respect to the head bracket 87 is accurately determined, the position of the thermal head 30 after installation will be maintained. The position is always constant.

Next, the installation state and locked state of the roll paper storage box 19 will be explained based on FIGS. 11 to 15. First, the slide rails 18 provided on the sides have a normal shape that allows them to slide freely in the front-rear direction and can be pulled out toward the front. And the auxiliary rail 18 provided below
has a guide shaft 96 suspended between the front plate 68 and the rear plate 40. Two brackets 97 are slidably fitted to this guide shaft 96 at a predetermined interval, and these brackets 97 are connected to an intermediate guide 98.
is fixed to. This intermediate guide 98 has approximately the same length as the roll paper storage box 19 and has a channel-shaped cross section. Two protrusions 99 and 100 are bent at the intermediate portion and the front side. Next, a protruding piece 101 that approaches and separates from the outer side of the protruding piece 100 is bent in front of the side surface of the roll paper storage box 19. Furthermore, a locking lever 102 is provided at the back so as to be rotatable around a pin 103. A knob 104 is formed on this locking lever 102, and a tongue piece 105 facing the protruding piece 99 is integrally formed. The intermediate guide 98 is arranged so that the tongue piece 105 can rotate to release the engagement with the protruding piece 99 in a state where the tongue piece 105 is joined to the protruding piece 99.
An escape notch (not shown) is formed in the.

Next, the roll paper holder 21 is provided with a bearing body 107 which is urged outward by a compression spring 106.
This bearing body 107 is provided with a conical portion 10 of a gear body 108 rotatably attached to the back plate 40.
9 is pressed. Further, the gear body 108 is engaged with a gear portion 111 of a cam body 110 rotatably attached to the back plate 40. A protruding piece 114 that engages with two stopper pins 112 and 113 and an arc notch 115 having a predetermined arc length are formed on the outer periphery of the cam body 110. Then, the roll paper holder 2
A lock plate 116 that engages with and disengages from the cam body 110 is fixed to the rear end surface of the cam body 110.

The operation of attaching and detaching the roll paper storage box 19 will now be explained. For convenience of explanation, the removal operation will be explained first. First, in the installed state,
This is shown in FIGS. 12 and 15, and the roll paper holder 21 is held by grasping the roll paper knob 24.
Rotate clockwise. As a result, the recording paper 20 that had been extended toward the thermal head 30 is completely rewound. At the same time, the cam body 110 rotates counterclockwise due to the clockwise rotation of the gear body 108 and stops at the position where the projection 114 abuts the stopper pin 112. As a result, the arc notch 115 is aligned with the position of the lock plate 116, as shown in FIG. Therefore, the lock in the drawing direction of the roll paper storage box 19 is released, and when the roll paper knob 24 is grasped and pulled out, the roll paper storage box 19 is pulled out along the slide rail 17. The amount of withdrawal at this time is the relative movement distance between the roll paper storage box 19 and the intermediate guide 98, that is,
This is the sum of the distance A between the tongue piece 105 and the protruding piece 99 and the relative movement distance between the intermediate guide 98 and the guide shaft 96, that is, the distance B between the front bracket 97 and the front plate 68. Therefore, the entire roll paper storage box 19 projects sufficiently forward from the front plate 68. In this state, when the knob 104 is pressed and the locking lever 102 is rotated upward, the tongue piece 10
5 is disengaged from the protrusions 99, 100, and the roll paper storage box 19 can be completely pulled out to the front. Such withdrawal is in special cases, such as for maintenance. As a result, the roll paper storage section 16 becomes a space, and as a result, operations such as removing the thermal head 30 described above are extremely easy.

In addition, as mentioned above, the roll paper storage box 19
If it is simply pulled out, it is for replenishing the recording paper 20, and the roll paper holder 21 is pulled up and taken out, and a new recording paper 20 is set. Then, when the roll paper knob 24 is grasped and pushed in as it is, the bearing body 107 is pressed against the conical portion 109 of the gear body 108 . In this state, the roll paper holder 21 is rotated counterclockwise. As a result, the gear body 108 rotates counterclockwise and the cam body 110 rotates clockwise, resulting in the state shown in FIG. 15. As a result, the cam body 110 is brought to a position where it interferes with the lock plate 116, and the roll paper storage box 19 is prevented from coming off. and,
Hold the feed roller knob 117 and remove the recording paper 2.
0 is sent out, but a slip occurs between the bearing body 107 and the gear body 108, and the state shown in FIG. 15 is maintained.

Note that since the center of gravity of the cam body 110 is offset from its center, even if it is in a free state at the position shown in FIG. The lock plate 116 reliably passes through the arcuate notch 115.

The recording paper 20 thus stored in the roll paper storage box 19 is sent out by the delivery roller 26, and the protruding portion is cut by the hand cutter 27, so that the leading edge of the recording paper 20 is neatly aligned.

Then, the roll paper storage box 19 is set in a fixed position and the recording paper 20 is sent out by the delivery roller knob 117. At this time, since the reset lever 71 remains rotated clockwise, the thermal head 30 is separated from the platen roller 29, and the distance between the idler roll 92 and the paper feed roller 35 is also widened.

Therefore, to explain based on Fig. 17, first,
The signal sound flag and warning sound flag of the controller 124 are set, and the first recording paper detection sensor 1
21 and the second recording paper detection sensor 122 are ON.
Check sequentially whether or not. both
If it is ON, the recording paper 20 is cutter 32.
Since the signal has exceeded the threshold value, a signal tone based on the oscillator 1131 is generated and the signal tone flag is reset. As a result, the generation of the signal tone ends instantaneously. Next, when the front door is closed after rotating the reset lever 71 counterclockwise, the external switch 123 is turned on.
ON, the recording paper 20 is sequentially fed by the platen roller 29, the recording paper 20 is cut by the cutter 32, and the recording paper 20 is sequentially fed by the platen roller 29.
One cycle of pulling back to the thermal head 30 portion of 0 is performed, and loading of the recording paper 20 is completed.

Therefore, when at least one of the first and second recording paper detection sensors 121 and 122 is not turned on, the front door is closed and the external switch 123 is turned on.
When turned on, the warning sound flag is set, so a warning sound based on the oscillator 2132 is generated, and the recording paper 2132 generates a warning sound.
indicates that it is not loaded. and,
Reset the warning sound flag.

〔Effect of the invention〕

In the present invention, as described above, a signal sound is generated when the recording paper emits a detection signal by the first recording paper detection sensor and the second recording paper detection sensor, so that it is possible to visually check when loading the recording paper. The loading position can be determined reliably without checking with the external switch, and since loading is not completed when an external switch is used, a warning sound is generated, eliminating mistakes in setting the recording paper. By turning on the recording paper, one cycle of transporting and pulling back the recording paper is performed, so that it is possible to eject a fixed length from the first sheet.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional front view of a facsimile machine, FIG. 2 is an enlarged longitudinal sectional front view of a part of the recording paper path, and FIG. Figure 4 is a plan view of the drive system with the cutter, and Figure 5 is a rear view of the drive system of the paper feed roller, viewed from the rear.
FIG. 6 is a partially cutaway plan view, FIGS. 7 and 8 are explanatory diagrams showing the driving force transmission state of each part,
Figure 9 is a front view showing the parts arrangement with the front panel omitted, Figure 10 is its plan view, Figure 11 is a front view of only the roll paper storage section, and Figure 12 is a partially cutaway plan view. Figure 13 is a side view of the locking lever part, Figure 14 is a front view of the part facing the back end surface that the roll paper storage box comes into contact with, and Figure 15 is the same as in Figure 14 when the roll paper storage box is locked. Front view of state, Fig. 16 is block diagram, Fig. 17
The figure is a flowchart. 20...Recording paper, 29...Platen roller (conveyance roller), 30...Thermal head (recording head), 3
2...Cutter, 121...First recording paper detection sensor, 122...Second recording paper detection sensor, 123
... external switch, 131 ... oscillator 1 (recording paper detection notification means), 132 ... oscillator 2 (warning notification means).

Claims (1)

[Scope of Claims] 1. A recording head and a cutter are sequentially arranged along the paper passing direction of the recording paper fed by the conveyance roller, and a first recording paper detection sensor is provided in front of the conveyance roller. A second recording paper detection sensor is provided on the exit side of the cutter, and the recording paper detection sensor notifies the user when both the first recording paper detection sensor and the second recording paper detection sensor detect recording paper. A notification means is provided, and when both of the recording paper detection sensors detect recording paper, by turning on an external switch, a conveyance cycle of conveying the recording paper, cutting it, and pulling the recording paper back to the recording head is performed once. A recording paper loading device characterized by: 2. A recording head and a cutter are sequentially arranged along the paper passing direction of the recording paper fed by the conveyance roller, and a first recording paper detection sensor is provided in front of the conveyance roller, and a first recording paper detection sensor is provided on the exit side of the cutter. a second recording paper detection sensor is provided, and a recording paper detection notification means is provided for notifying the user when both the first recording paper detection sensor and the second recording paper detection sensor detect recording paper; The apparatus is characterized by being provided with a warning notification means for notifying a warning different from the notification of the recording paper detection notification means by turning on an external switch when at least one of the recording paper detection sensors is not detecting recording paper. Recording paper loading device. 3. The recording paper loading device according to claim 1 or 2, characterized in that the recording paper loading device is an external switch that is turned on and off by opening and closing a door of the casing.