JP2591037Y2 - Roll paper supply mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper supply mechanism in a printer or the like.

[0002]

2. Description of the Related Art As a prior art, a thermal printer using roll paper will be described below with reference to the drawings. FIG. 4 is a schematic side view. In FIG. 4, reference numeral 1 denotes a paper storage unit, and reference numeral 2 denotes a thermal roll paper, which is wound around a support shaft 2a as shown in FIG. Reference numeral 3 denotes a paper supply shaft, and reference numeral 4 denotes a shaft groove. The thermal roll paper 2 is fitted into the paper supply shaft 3, and both ends of the paper supply shaft 3 are received by the shaft groove 4. Rotate together. 5 is an outer lid, 6 is this outer lid 5
And presses the thermal roll paper 2 by performing an operation of closing the outer lid 5. Reference numeral 7 denotes a paper insertion opening, 8 denotes a driving roller, and 9 denotes a pressure roller. The pressure roller 9 is usually disposed at a position spaced from the driving roller 8, and the heat-sensitive roll paper 2 is formed by the pressure roller 9 and the driving roller 8. Can freely pass through the gap. Further, the heat-sensitive roll paper 2 can be conveyed by applying the pressure roller 9 to the drive roller 8 as needed, clamping the heat-sensitive roll paper 2, and rotating the drive roller 8. Reference numerals 10a and 10b denote paper sensors, which are provided downstream of the driving roller 8 and the pressure roller 9. 11, a roller platen; and 12, a thermal head. Reference numeral 13 denotes a spring, which holds the thermal paper by applying the thermal head 12 to the roller platen 11 via the thermal paper by the generated force, and transports the thermal paper by rotating the roller platen 11 in this state. be able to. A cam 14 can provide a gap of about 1.5 mm between the thermal head 12 and the roller platen 11 if necessary. 15a, 1
5b is a paper sensor provided downstream of the thermal head 12. 16 and 17 are guide plates, usually 16a, 1
It has retreated to the position 7a. 18 is a winding core, 19
Is a slit provided in the winding core 18.
Reference numeral 20 denotes a phase sensor which detects the angle of the slit 19 provided in the winding core 18.

The operation of the above configuration will be described below.
To set the thermal paper, the support shaft 2a of the thermal roll paper 2
Is fitted to the paper supply shaft 3, the paper supply shaft 3 is locked in the shaft groove 4, the leading end 2 b of the thermal roll paper 2 is inserted from the paper insertion slot 7, and is passed through the gap between the drive roller 8 and the pressure roller 9. , The tip 2b of the thermal roll paper 2 is connected to the paper sensor 10a,
Push down to the position of 10b. At this time, a pressure roller 9 is applied to the drive roller 8 as a trigger and information of the paper sensors 10a and 10b by a control device (not shown).
The thermal paper is tamped, and a gap of about 1.5 mm is provided between the thermal head 12 and the roller platen 11 by a cam.
The guide plates 16 and 17 are directed in the direction of guiding to the take-up core 18, the direction of the slit 19 of the take-up core 18 is detected by the phase sensor 20, and the slit 19 is set in the guide plate 1.
An initial operation for turning to the directions of 6 and 17 is performed. Thereafter, the thermal paper is transported by the drive roller 8 and the thermal head 12 is moved.
And the roller platen 11, and starts counting the amount of conveyance from the time when the leading edge 2b of the thermal paper has passed the paper sensors 15a and 15b.
When the number of counts required for b to completely pass through the slit 19 of the take-up core 18 is stopped, the transfer of the thermal paper is stopped. After the conveyance is stopped, the pressure roller 9 is separated from the driving roller 8 by a control device (not shown), the cam 14 is operated, the thermal head 12 is applied to the roller platen 11 to hold the thermal paper, and the guide plates 16 and 17 are moved. 16a,
It is evacuated to the position of 17a. Further, the winding core 18
Is rotated in the direction of the arrow to wind the thermal paper by a predetermined amount, and the rotation of the winding core 18 is stopped. This completes the setting of the thermal paper. After the automatic setting, the following printing operation is performed unless a control device (not shown) detects an abnormality. The image to be printed is decomposed into a horizontal x vertical dot matrix, and the horizontal corresponds to the heating elements of the thermal head 12,
The vertical direction corresponds to the rotation of the roller platen 11, and the printing of the image to be printed is performed by synchronizing the heat generation of the heating element and the rotation of the roller platen 11. At this time, the thermal paper is conveyed by friction due to the rotation of the roller platen 11. Skew (skew) occurs. For this reason, the thermal roll paper 2 is pressed by the paper press 6 attached to the outer lid 5 to prevent the printing position from being out of order. As a result, friction is given to the thermal roll paper 2 and the thermal paper can be fed out without generating unnecessary slack in the transport path. When unnecessary slack of the thermal paper is removed in this manner, it is effective to install the paper supply shaft 3 of the thermal roll paper 2 in parallel with the roller platen 11, and the thermal paper is transferred to the roller platen 11 and the thermal head 12. The thermal paper is supplied perpendicular to the thermal head 12, and the position of the thermal paper is accurately determined with respect to the thermal head 12, so that the accuracy of the printing position can be improved. As a method of applying friction to the thermal roll paper 2, there is a method using lateral pressure other than the method using the paper presser 6 attached to the outer lid 5.
As shown in FIG. 5, this is an example in which friction is applied by side pressure. In the figure, reference numerals 21 and 22 denote side pressure springs, and both ends of the paper supply shaft 3 are pressed by the side pressure springs to apply friction to the thermal roll paper 2. The printing position accuracy can be improved. The printing operation can be performed as described above.However, any of these methods requires a paper press or a side pressure spring as a friction mechanism for preventing skew and removing slack of the thermal paper, and the apparatus is complicated. There is a problem that it becomes large.
In addition, setting errors such as forgetting to close the outer lid and disengagement of the lateral pressure spring are likely to occur. Operability is poor.

[0004]

The problem to be solved is to increase the size of the apparatus by means of a paper press and a side pressure spring provided to prevent skew and to prevent the paper from sagging.
Mistakes in setting and poor operability.

[0005]

According to the present invention, a paper supply shaft for supplying paper by fitting a support shaft for roll paper is provided, and a rotary shaft is arranged outside the fixed shaft, and between the rotary shaft and the fixed shaft. A movable body is provided and pressed by an elastic body between the fixed shaft and an elastic body, and a protrusion protruding inside the rotary shaft is sandwiched between the fixed shaft and the movable body via a friction body and pressed and sandwiched by the elastic body , Fixed
Since the elliptical portion of the shaft is fitted and fixed in the shaft groove, a small and reliable structure for preventing skew and paper slack is provided.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. In the following description, the same parts as those in the above-described conventional technology will be described using the same reference numerals. Figure 1 is a schematic side view, FIG. 2 is a side view of the sheet supply shaft 3 is a sectional view of the sheet supply shaft, in FIG, 1 is paper storage unit, 2 is sensitive
As shown in FIG. 6, the support shaft 2 is a roll paper which is hot paper .
a. Reference numeral 23 denotes a paper supply shaft, which has the following configuration. 2 and 3, 24
Is a fixed shaft fixed to a frame (not shown), 25 is a rotation shaft arranged outside the fixed shaft 24,
5a is projected. Friction body such as 26 is mounted on the fixed shaft 24 felt, friction body such as felt attached to the movable body to be described later is 27, 28 movable member, 29 is a spring, the rotating shaft 25 b Lumpur paper 2 And the fixed shaft 24 rotates integrally with the support shaft 2a through the friction body 26,
It is connected to a movable body 28 via a friction body 27. The spring 29 is located between the movable body 28 and the fixed shaft 24.
Is sandwiched between the fixed shaft 14 and the movable body 28 via the frictional bodies 26 and 27 to apply friction to the rotating shaft 25. In addition,
The portion of the fixed shaft 24 that engages with the shaft groove 4 described later is formed in an elliptical shape, and the fixed shaft 24 does not rotate as described above. Further, the rotation shaft 25 is parallel to the roller platen.
4 is a axial groove, fitted with a b Lumpur sheet 2 to the sheet feed shaft 23,
As receiving the ends of the sheet feed shaft 23 in this axial groove 4, thereby shite rotating b Lumpur sheet 2 together with the paper feed shaft 23. 7 paper insertion port 8 is driven rollers, 9 is a pressure roller, the pressure roller 9 is disposed in a position normally with a drive roller 8 and the gap b Lumpur paper 2, the pressure roller 9 and the driving roller 8 can freely pass through the gap. If necessary abut against the pressure roller 9 to the driving roller 8, clamps the B Lumpur paper 2, the driving roller 8 Lilo Lumpur paper 2 by the rotating the it can be transported. 10a and 10b are paper sensors,
It is provided downstream of the driving roller 8 and the pressure roller 9. 11, a roller platen; and 12, a thermal head. A spring 13 causes the thermal head 12 to move the roller platen 1 via the roll paper 2 by the force of the spring.
1 and holds the roll paper 2, and by rotating the roller platen 11 in this state, the roll paper 2
Can be transported. A cam 14 can provide a gap of about 1.5 mm between the thermal head 12 and the roller platen 11 if necessary. 15a, 1
5b is a paper sensor provided downstream of the thermal head 12. 16 and 17 are guide plates, usually 16a, 1
It has retreated to the position 7a. 18 is a winding core, 19
Is a slit provided in the winding core 18.
Reference numeral 20 denotes a phase sensor which detects the angle of the slit 19 provided in the winding core 18.

The operation of the above configuration will be described below.
To load roll paper 2, the b Lumpur sheet 2 supporting shaft 2a
Is fitted to the paper supply shaft 23, and the paper supply shaft 23 is
Engaged thereby locked in, insert the tip 2b of Russia Lumpur paper 2 from the paper insertion opening 7, the driving roller 8 and through the gap between the pressure roller 9, b Lumpur sheet 2 of the tip 2b of the sheet sensors 10a, 10
Push down to position b. At this time, by a control device (not shown), abut against the sheet sensor 10a, the pressure roller 9 as information and triggers 10b to the drive roller 8, the low
The paper 2 is clamped, and a gap of about 1.5 mm is provided between the thermal head 12 and the roller platen 11 by a cam.
The guide plates 16 and 17 are directed in the direction of guiding to the take-up core 18, the direction of the slit 19 of the take-up core 18 is detected by the phase sensor 20, and the slit 19 is set in the guide plate 1.
An initial operation for turning to the directions of 6 and 17 is performed. Thereafter, the roll paper 2 is conveyed by the driving roller 8 and passes through the gap between the thermal head 12 and the roller platen 11, and then the leading end 2b of the roll paper 2 is detected by the paper sensors 15a, 15b.
Starts counting the transport amount from the time of passing through the roll
When the leading end 2b of the paper 2 reaches the count number necessary to completely pass through the slit 19 of the take-up core 18, the roll paper
Stop conveyance of 2 . After the conveyance is stopped, the pressure roller 9 is separated from the drive roller 8 by a control device (not shown),
By operating the cam 14, the thermal head 12 is brought into contact with the roller platen 11 to hold the roll paper 2 , and the guide plate 1
6 and 17 are retracted to the positions of 16a and 17a. Further, by rotating the winding core 18 in the direction of arrow roll
The paper 2 is wound by a predetermined amount, and the rotation of the winding core 18 is stopped, whereby the setting of the roll paper 2 is completed. After the automatic setting, the following printing operation is performed unless a control device (not shown) detects an abnormality. The image to be printed is decomposed into a horizontal × vertical dot matrix, the horizontal corresponds to the heating element of the thermal head 12, the vertical corresponds to the rotation of the roller platen 11, and the heat generated by the heating element and the roller platen 11
The image to be printed is printed by synchronizing the rotation of. At this time, the roll paper 2 is
The roller platen 11 has an incomplete outer peripheral cylindricity, and the thermal head 1
The skew (skew) of the roll paper 2 occurs due to the incompleteness of the flatness of the heating surface 2. Therefore, in this embodiment in order to prevent the printing position will be mad, projections 25a of the rotating shaft 25 which rotates the support shaft 2a integral with Russia Lumpur paper 2
It will be given the friction by the Lilo <br/> Lumpur paper 2 that gave friction on the rotation shaft 25 across the fixed shaft 24 and the movable member 28 through the friction body 26 and 27, the conveying path without generating unnecessary slack in the roll paper 2 on the inner row
The paper 2 can be paid out. In this manner, when eliminating unnecessary slack in the roll paper 2, b Lumpur paper 2
It is effective that the paper supply shaft 23 is set in parallel to the roller platen 11, and the roll paper 2 is supplied perpendicularly to the roller platen 11 and the thermal head 12.
The position of the roll paper 2 is accurately determined with respect to the thermal head 12, so that the accuracy of the printing position can be improved.

[0008]

According to the present invention described in detail above, the paper supply shaft that supplies the paper by fitting the support shaft of the roll paper,
The rotation shaft is disposed outside of the stationary shaft, pressed by the elastic member between the stationary shaft provided with a movable body between the fixed shaft and the rotating shaft, the friction body projections projecting from the inner side of the rotary shaft By interposing between the fixed shaft and the movable body and pressing and holding by the elastic body, it is possible to prevent the paper skewing without any operation by the operator and to make the paper unnecessary. Since the occurrence of sagging can be prevented, there is an effect that attention is required to the operation and operability is not degraded. In addition, since the friction mechanism is configured in the paper supply shaft, there is an effect that the apparatus is not enlarged and there is no erroneous operation.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment.

FIG. 2 is a side view of a paper supply shaft.

FIG. 3 is a sectional view of a paper supply shaft.

FIG. 4 is a schematic side view showing a conventional example.

FIG. 5 is a schematic side view showing another conventional example.

FIG. 6 is a perspective view of roll paper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper storage part 2 Roll paper 4 Shaft groove 23 Paper supply shaft 24 Fixed shaft 25 Rotation shaft 25a Projection 26 Friction body 27 Friction body 28 Movable body 29 Spring

Claims (1)

(57) [Scope of request for utility model registration] A rotating shaft disposed outside a fixed shaft, a movable body provided between the rotating shaft and the fixed shaft, and a paper feeding shaft for supplying the paper with the support shaft of the roll paper fitted therein. Between the fixed shaft and the movable member via a frictional member, and press-clamped by the elastic member, and press the elliptical portion of the fixed shaft into an axial groove. Fit in
A roll paper supply mechanism, which is configured to be fixed .