JP2003081495A - Rolled sheet supply device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolled sheet supply device for allowing the supply and rerolling of a rolled sheet and improving the accuracy of detecting a remaining amount and a recording device. SOLUTION: The rolled sheet supply device for supplying the rolled sheet rolled on a paper jointing tube comprises a driven coupling 62 provided on a holding shaft holding the paper jointing tube, a driving coupling 61 to be coupled to the driven coupling 62 for transmitting driving force, a paper jointing tube spring 63 for thrusting the driving coupling 61 against the driven coupling 62, and restricting means for restricting the movement of the driving coupling 61 to the direction of the driving coupling 62, the driving coupling 61 being movable to the radial direction of the holding shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll sheet supply device for supplying a roll sheet used for recording and supplying it to a printer or the like, and a recording device provided with the roll sheet supply device.

[0002]

2. Description of the Related Art When supplying a long sheet to a printer,
Alternatively, in order to continuously supply the recording sheets, a method may be adopted in which a long recording sheet is wound around a paper tube in a roll shape to form a roll sheet, which is loaded into an apparatus and supplied to a recording unit.

When a roll sheet is mounted on a printer for recording, it is necessary to detect the remaining amount of the roll sheet.
Therefore, conventionally, a mechanism that generates a pulse proportional to the amount of roll sheet conveyed and calculates the amount used / residual amount by the integrated value of this pulse (Japanese Patent Laid-Open No. 09-058911) and roll rotation for a certain amount of roll sheet conveyed A mechanism for obtaining the usage / remaining amount of the roll sheet from the speed or angle (Japanese Patent Laid-Open No. 06-27893)
No. 9) is proposed.

[0004]

However, as in the prior art, the roll sheet winding diameter is detected by detecting the rotation speed of the paper tube rotated by the roll sheet supplied at a constant speed, and the remaining roll sheet remains. In the detection mechanism that detects the amount,
If the center axis of the paper tube side coupling that rotates together with the paper tube holding shaft and the center axis of the detection side coupling that rotates together with the pulse detection plate are misaligned, even if the paper tube holding shaft rotates at a constant speed. The rotation speed of the pulse detection plate fluctuates. Therefore, pulsation occurs in the frequency of the detected pulse, and the rotation speed of the paper tube holding shaft cannot be accurately detected, and the remaining amount of the roll sheet cannot be accurately detected.

The present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a roll sheet feeding device and a recording device capable of improving the precision of roll sheet feeding, rewinding and remaining amount detection. It is a thing.

[0006]

A typical constitution according to the present invention for achieving the above object is to provide a roll sheet feeding device for feeding a roll sheet wound around a tubular member, to hold the tubular member. A driven coupling provided on the shaft, a drive coupling that is coupled to the driven coupling and transmits a driving force, a pressing unit that presses the drive coupling against the driven coupling, and the drive coupling described above. Restricting means for restricting movement in the driven coupling direction, and the drive coupling is movable in the radial direction of the holding shaft.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A roll sheet feeding apparatus and a recording apparatus having the same according to an embodiment of the present invention will be described with reference to the drawings.

{Recording Device} First, a recording device provided with a roll sheet feeding device will be briefly described. FIG. 5 is a schematic explanatory view of a recording apparatus using a roll sheet. The recording apparatus A records on a roll sheet, and the roll sheet 12 held by the roll sheet supply apparatus B is pulled out to the recording unit 200, After performing a predetermined recording in the recording unit 200,
The cutter 201 cuts the sheet, and the discharge roller 202 discharges the sheet to the outside.

In the recording section 200 of this embodiment, the thermal head 200b is pressed against the platen roller 200a.
Then, the roll sheet 12 is nipped by both of them, the platen roller 200a is rotated, and the thermal head 200b is caused to generate heat in accordance with an image signal, whereby a predetermined image is recorded on the roll sheet 12 composed of a long-sized heat-sensitive sheet. It uses a thermal recording method.

Of course, the structure of the recording unit 200 is not limited to the heat-sensitive recording system, but a thermal transfer recording system or an inkjet recording system may be used. In that case, plain paper can be used as the roll sheet. .

{Roll Sheet Feeding Device} Next, the roll sheet feeding device B used in the recording device A will be described. 1 is an explanatory view of the roll sheet feeding device, FIG. 2 is a cross sectional explanatory view of the coupling portion, FIG. 3 is a cross sectional explanatory view showing the state of the coupling without the roll sheet mounted, and FIG. FIG. 6 is a cross-sectional explanatory view showing a state of coupling with a roll sheet attached.

(Coupling Structure) In FIGS. 1 and 2, reference numeral 1 is a motor, and 2 to 6 are gears constituting a supply gear train. The gear 4 and the gear 5 are connected via a torque limiter 7. Reference numeral 8 is a supply drive gear that drives the supply drive roller 10, and is driven by the motor 1 via the supply gear trains 2 to 6.

Reference numeral 51 is a roller driving coupling, 52 is a roller driven coupling, and the roller driving coupling 51 is pressed and coupled to the roller driven coupling 52 by a roll spring 53 as a pressing means. 10 is a supply drive roller,
It can rotate integrally with the roller driven coupling 52. The supply driving roller 10 nips a roll sheet 12 wound around a tubular member (hereinafter referred to as “paper tube”) 11 made of paper or the like together with the supply driven roller 9 and sends it to the recording unit 200 described above.

Reference numerals 21 to 23 are gears constituting a rewinding gear train. The gear 22 and the gear 23 are connected via a one-way clutch 24. Reference numeral 25 is a paper tube drive gear that drives the paper tube, and is driven by a motor via rewinding gear trains 21-23.

61 is a paper tube driving coupling, 62 is a paper tube driven coupling, and a paper tube spring 63 as a pressing means
The paper tube driving coupling 61 is pressed and coupled to the paper tube driven coupling 62. A roll sheet holding member 70 is rotatable together with the paper tube driven coupling 62. The roll sheet holding member 70 can attach and detach the paper tube 11 and can rotate integrally with the paper tube 11.

The supply driving roller 10, the supply driven roller 9, the roller driven coupling 52, the roll sheet holding member 70, the paper tube driven coupling 62, and the paper tube 11 are housed in a cartridge 80, and the supply drive roller 10, the supply driven roller are driven. Both ends of the roller 9 and the roll sheet holding member 70 are rotatably supported by the cartridge 80, and the cartridge 80 is movable in the axial direction of the paper tube.

The roller drive coupling 51 and the paper tube drive coupling 61 have substantially the same shape.
A shaft 54 (64) of a paper tube drive coupling (hereinafter, referred to as “drive coupling”) 51 (61) is rotatably locked to a main plate 72. Further, the drive coupling has a conical surface 51a.
There is (61a). In this conical surface 51a (61a), the drive coupling 51 (61) is a roller driven coupling / paper tube driven coupling (hereinafter referred to as a driven coupling) 52 (62).
When it is not engaged with, it engages with the fitting hole 71a (71b) provided in the pressing plate 71 as the restricting means, as shown in FIG.

When the drive coupling 51 (61) is engaged with the driven coupling 52 (62), as shown in FIG.
The drive coupling 51 (61) is disengaged from the pressing plate 71, and the drive coupling 51 (61) and the holes 71a (71b) rattle. Therefore, the drive coupling 51 (61) can be moved around the main plate 72 in the radial direction of the paper tube holding shaft.

Further, in FIG. 1, reference numerals 30 and 31 denote transmission gears for transmitting the rotation of the paper tube to the pulse plate 32, which accelerates the rotation of the paper tube and transmits it to the pulse plate. Reference numeral 33 is a photo interrupter as speed detecting means, which detects slits 32a radially formed in the pulse plate 32 and sends a signal to the arithmetic circuit. Reference numeral 41 denotes a load spring as a load means, which abuts on the outer circumference of the pulse plate 32 and causes a rotational load of the pulse plate 32.

(Loading of Cartridge) A case where the roll sheet cartridge 80 is loaded in the above configuration will be described.

With the cartridge 80 not loaded,
As shown in FIG. 3, in the drive coupling 51 (61), the conical surface 51a (61a) of the drive coupling 51 (61) has a hole 71a (71
Pressed in b). Drive coupling in this state
The shaft 54 (64) of 51 (61) has a conical surface on the coupling side,
The opposite side is fixed by a bearing 73 of the main plate 72.

Next, when the cartridge 80 is loaded from the left side in FIG. 2, the driven coupling 52 (62) comes into contact with the drive coupling 51 (61). And drive coupling 51
(61) moves to the right in FIG. 2 while charging the springs 53 (63), and the driven coupling 52 (62) engages with the drive coupling 51 (61) and can rotate integrally.

At this time, since the conical surface 51a (61a) of the drive coupling 51 (61) is disengaged from the hole 71a (71b) of the pressing plate 71, the driven coupling 52 (62) and the drive coupling 51 (61). Is a hole in the conical surface 51a (61a) and the pressing plate 71.
The center axis 52a (62a) of the driven coupling 52 (62) and the center hole 51b (61b) of the drive coupling 51 (61) are not disturbed by the engagement of the 71a (71b), and the center axis 52a (62a) is aligned and joined.

When the driven coupling 52 (62) and the drive coupling 51 (61) are combined, the drive coupling 51 (61)
Since the position of the shaft 54 (64) is determined by the driven coupling 52 (62), the shaft 54 (64) is inclined with respect to the main plate 72,
Gear meshing deviates from the original meshing state.

Therefore, in this embodiment, the gear module is made large and the gear 8 (25) is arranged near the bearing,
The effect of shaft tilt on gear mesh is minimized.

(Rolling of Roll Sheet) The rotation of the motor 1 is transmitted from the supply gear trains 2 to 6 to the supply drive roller 10 via the supply drive gear 8 and the roller couplings 51 and 52. At the same time, the rotation of the motor 1 is transmitted from the rewinding gear trains 21 to 23 to the paper tube 11 via the paper tube drive gear 25 and the paper tube couplings 61 and 62.

The roll sheet feeding speed by the supply driving roller 10 is always set to be higher than the roll sheet feeding speed by the paper tube 11 regardless of the diameter of the roll sheet wound around the paper tube 11. This is because the roll sheet is not loosened and the driving force of the supply driving roller 10 is reduced. At this time, the paper tube 11 rotates along with the roll sheet feeding speed of the supply driving roller 10, so that the slow drive by the rewinding gear trains 21 to 23 needs to idle the paper tube 11. Therefore, one-way gears are arranged in the rewinding gear trains 21-23. Needless to say, the one-way gear stops idling and assists the driving force when the driving force of the supply driving roller 10 is insufficient and the sheet feeding slips and the sheet feeding speed becomes slow.

(Rewinding of Roll Sheet) Next, the motor 1
A case in which the paper core 11 rewinds and the paper tube 11 rewinds the roll sheet will be described.

The roll sheet rewinding speed by the paper tube 11 is independent of the diameter of the roll sheet wound on the paper tube 11.
It is set to always be faster than the roll sheet rewinding speed by the supply driving roller 10. This is because the roll sheet is rewound without being loosened.

At this time, since the supply driving roller 10 rotates along with the roll sheet feeding speed of the paper tube 11, slow drive by the rewinding gear trains 21 to 23 needs to idle the paper tube 11. However, when the one-way gears are arranged like the rewinding gear trains 21 to 23, no tensile force is applied to the sheet between the supply drive roller 10 and the paper tube 11. When wound in a roll shape in this state, the roll sheet is loosely wound, that is, a so-called bluff winding, and further, skewing, wrinkles, and the like occur. Therefore, in the present embodiment, the torque limiter 7 is arranged in the supply gear trains 2 to 6 to apply tension to the sheet between the supply drive roller 10 and the paper tube 11.

(Detection of Remaining Amount of Roll Sheet) Next, a configuration for detecting the remaining amount of roll sheet will be described. In order to supply the roll sheet at a constant speed, the motor 1 rotates at a constant rotation speed. On the other hand, when the roll sheet is supplied at a constant speed, the rotation speed of the paper tube 11 changes depending on the roll sheet winding diameter. Therefore, the roll sheet winding diameter can be detected by detecting the paper tube rotation speed when the roll sheet is supplied at a constant speed. That is, the remaining amount of the roll sheet can be detected.

In the present embodiment, the paper tube rotation speed is detected by counting the slits 32a provided in the pulse plate 32 with the photo interrupter 33. At this time, the larger the number of pulses per unit time, the less likely it is to be affected by various error factors. Therefore, the transmission gear has a gear ratio set so as to increase the rotation speed of the paper tube and transmit it to the pulse plate 32.

However, in the speed increasing gear train, in general,
The backlash on the original side is also amplified, and the backlash of the gear at the speed-up destination increases.

Therefore, in the present embodiment, the load spring 41 is provided and a rotational load is applied to the pulse plate 32 to prevent the pulse plate 32 from rotating carelessly due to backlash.
As a result, it is possible to prevent the occurrence of pulses that should not occur due to backlash, improve the accuracy of pulse counting, increase the accuracy of detecting the paper tube rotation speed, and improve the accuracy of detecting the remaining amount of the roll sheet.

Further, in this embodiment, as described above, the drive coupling 51 (61) and the driven coupling 52 are used.
Since the rotation center of (62) is aligned,
There are the following merits.

That is, in the conventional method, the roll sheet winding diameter is detected by detecting the rotation speed of the paper tube rotated by the roll sheet supplied at a constant speed, and the remaining amount of the roll sheet is detected. In the detection mechanism that detects, when the center axis of the paper tube side coupling that rotates together with the paper tube holding shaft and the center axis of the detection side coupling that rotates together with the pulse detection plate shift, the paper tube holding shaft moves at a constant speed. The rotation speed of the pulse detection plate fluctuates even when it is rotated with, and the frequency of the detected pulse pulsates, making it impossible to accurately detect the rotation speed of the paper tube holding shaft. By matching the number of rotations of the ring and the detection side coupling, the pulse pulsation is eliminated and the rotation speed of the paper tube can be accurately detected. Because it has been Central axis movement is difficult).

Further, when the drive coupling 51 (61) is pressed in the coupling direction with the driven coupling 52 (62) and both couplings are not coupled, the drive coupling 51 (61) is
Since the (61) is locked following the fitting hole 71a (71b) provided in the pressing plate 71, the drive coupling 51 (61) and the driven coupling 52 (62) are substantially aligned with each other, and the coupling is formed. Can be easily combined.

Further, the supply drive roller 10 and the paper tube drive mechanism can be driven by forward and reverse rotation of one motor.

Further, when the roll sheet is supplied, the rotation speed of the supply drive roller 10 is made higher than the rotation speed of the paper tube drive mechanism, a one-way clutch is put in the paper tube drive mechanism, and the paper sheet is conveyed by the supply drive roller 10 at the time of sheet supply. The paper tube drive mechanism does not block the movement of the sheet.

Further, the rotation speed of the paper tube drive mechanism at the time of rewinding the roll sheet is made higher than the rotation speed of the supply drive roller 10, and a torque limiter is added to the drive mechanism of the supply drive roller 10 to rotate in the rewind direction. At times, back tension is applied to the roll sheet to prevent tarmi and wrinkles.

[0041]

Since the present invention is constructed as described above,
It is possible to improve the accuracy of roll sheet supply, rewinding, and remaining amount detection.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a roll sheet feeding device.

FIG. 2 is an explanatory cross-sectional view of a coupling portion.

FIG. 3 is an explanatory cross-sectional view showing a state of the coupling without a roll sheet attached.

FIG. 4 is an explanatory cross-sectional view showing a state of the coupling with the roll sheet attached.

FIG. 5 is a schematic explanatory diagram of a recording apparatus using a roll sheet.

[Explanation of symbols]

A ... Recording device 1 ... Motor 2, 3, 4, 5, 6 ... Gear 7 ... Torque limiter 8 ... Supply drive gear 9 ... Supply driven roller 10… Supply drive roller 11… Paper tube 12… Roll sheet 21, 22, 23 ... Gear 24… One-way clutch 25… Paper tube drive gear 30, 31… Transmission gear 32 ... Pulse board 32a ... slit 33… Photo interrupter 41… Load spring 51, 61… Drive coupling 51a, 61a ... Conical surface 51b, 61b ... Center hole 52, 62… Driven coupling 52a, 62a ... central axis 53… roll spring 54, 64… Axis 63… Paper tube spring 70 ... Roll sheet holding member 71… Pressing plate 71a, 71b ... hole 72… Main plate 73… Bearings 80… Cartridge 200… Recording section 200a ... Platen roller 200b ... Thermal head 201… Cutter 202… Ejection roller

Claims (6)

[Claims] 1. A roll sheet feeding device for feeding a roll sheet wound around a tubular member, wherein a driven coupling provided on a holding shaft for holding the tubular member and a driven coupling are combined to generate a driving force. A drive coupling that transmits the drive coupling; a pressing means that presses the drive coupling against the driven coupling; and a regulation means that regulates movement of the drive coupling in the driven coupling direction. A roll sheet feeding device, wherein a ring is movable in a radial direction of the holding shaft. 2. The drive coupling is provided with a central shaft / hole, the driven coupling is provided with a central hole / shaft, and when the drive coupling and the driven coupling are coupled, respective central shafts / holes are provided. 2. The roll sheet feeding device according to claim 1, wherein a center hole is engaged with the center hole of the drive coupling and a center axis of the driven coupling are aligned with each other. 3. The drive coupling is locked following a fitting hole provided in the regulating means when the drive coupling is in contact with the regulating means. 1. The roll sheet feeding device according to 1. 4. The roll sheet feeding device according to claim 1, wherein a drive gear for the rotary shaft is disposed in the vicinity of a bearing that axially supports a rotary shaft that rotates integrally with the drive coupling. 5. A rotating member that accelerates the rotating speed of the tubular member to rotate at a faster speed than the tubular member, a speed detecting unit that detects the rotating speed of the rotating member, and a rotary member that rotates on the rotating member. The roll sheet feeding device according to claim 1, further comprising: a load unit that applies a load. 6. A recording apparatus for recording on a roll sheet, comprising the roll sheet supply apparatus according to claim 1 capable of supplying the roll sheet.