JP2564726Y2 - Recording paper slack removal 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 mechanism for removing slack of recording paper in a transfer type printer.

[0002]

2. Description of the Related Art A recording paper and a transfer paper are interposed between a platen roller made of an elastic material and a thermal head provided so as to be in pressure contact with the platen roller, and the ink of the transfer paper is transferred to the recording paper. A transfer-type printer device for forming an image by using the same has already been provided. FIG. 4 shows a main part of the printer device. 4, a recording paper 1 is transported along paper feed guides 2a and 2b by a paper supply means (not shown), and sent between a platen roller 3 and a pinch roller 4 to position the leading end of the recording paper 1. Stops in contact with 5. Here, the stopper 5 is provided on the guide 6, and is rotatable in a direction substantially perpendicular to the transport direction of the recording paper 1 (a direction perpendicular to the paper surface). Also,
The platen roller 3 always stops at a predetermined position by a reference signal of an encoder (not shown) provided integrally on the shaft,
Then, the recording is started when the rotation is performed by a predetermined pulse amount.

When the leading edge position of the recording paper 1 is determined,
The pinch roller 4 is pressed against the platen roller 3 and the recording paper 1
Is reliably pinched between the platen roller 3 and the pinch roller 4, and then the stopper 5 is rotated and retracted to a position where it does not hinder the running of the recording paper 1. Then, the platen roller 3 rotates in the direction of the arrow in the drawing, and the recording paper 1 is sent between the platen roller 3 and the transfer paper 7 via the guide 6 and further passes through the thermal head 8 and the paper ejection guide 9a. , 9b, and the leading end of the recording paper 1 is moved to a pair of catchers 10a, 1b.
0b, the platen roller 3 stops.
Here, the pair of catchers 10a and 10b are rotatable at predetermined intervals in the width direction of the recording paper, and are provided at positions where they come into pressure contact with the paper discharge guide 9b when rotated. Further, friction pads 10c and 10d are formed at the pressure contact portions where the catchers 10a and 10b press against the sheet discharge guide 9b.

The recording paper 1 sent to the thermal head 8 by sandwiching the platen roller 3 and the pinch roller 4 is
The recording paper 1 is not loosely adhered to the outer periphery of the platen roller 3 but is fed while the recording paper 1 is slack due to its stiffness.
Moreover, the amount of slack is not always constant. Then, the catchers 10a and 10b rotate in the direction of the paper ejection guide 9b to clamp the leading end of the recording paper 1, the thermal head 8 is slightly separated from the platen roller 3, and the platen roller 3 is moved in the direction opposite to the arrow in the figure. The recording paper 1 is slightly rotated to absorb the slack of the recording paper 1 and stops. Here, the catchers 10a, 10
The holding force of b is weaker than that of the pinch roller 4. This is because even if the platen roller 3 rotates too much in the direction opposite to the arrow in the drawing, the recording paper 1 can catch the catchers 10a, 1a.
This is to prevent the relative position between the platen roller 3 and the recording paper 1 from being shifted by sliding between the recording paper 1 and the paper discharge guide 9b.

[0005] Thereafter, the thermal head 8 is pressed against the platen roller 3, the catchers 10a and 10b release the leading end of the recording paper 1, and the platen roller 3 rotates again in the direction of the arrow and rotates by a predetermined pulse. Recording starts. Then, the leading end of the recording paper 1 is guided to a discharge roller (not shown) along discharge guides 9a and 9b, and the transfer paper 7 passes through a peeling roller 11 integrally attached to the thermal head 8. It is wound in the direction of the arrow and the recording of the first color is completed. At this time, the recording is completed in a state where the rear end of the recording paper 1 is held by the pressure contact between the platen roller 3 and the pinch roller 4.

Thereafter, the thermal head 8 separates from the platen roller 3, and the platen roller 3 rotates in the reverse direction (in the direction opposite to the arrow in the drawing), so that the rear end of the recording paper 1 follows the paper feed guides 2a and 2b. The platen roller 3 stops rotating when the leading end of the recording paper 1 has passed the stopper 5 and the stopper 5 is in the initial state, that is,
After returning to the illustrated state, the pinch roller 4 separates from the platen roller 3. The leading end of the recording paper 1 that has become free due to the separation of the pinch roller 4 hits the stopper 5 by its own weight, the leading end is automatically positioned, and the platen roller 3 again rotates to the predetermined position and stops.

[0007] By the above repetition, the transfer recording of a plurality of colors is performed, and after the final recording is completed, the thermal head 8 is printed.
Is separated from the platen roller 3, and at the same time, the recording paper 1 is discharged to a predetermined position by rotation of a discharge roller (not shown). After the thermal head 8 separates, the platen roller 3 rotates to the initial set position and stops, and the pinch roller 4 also separates from the platen roller 3. Further, the stopper 5 also returns to the initial state, and is ready for the next transfer recording.

[0008]

However, in the above-described slack removing mechanism of the recording paper of the conventional printer, the catcher 1 for absorbing the slack of the recording paper 1 is used.
0a and 10b are attached to the downstream of the peeling roller 11 integrally attached to the thermal head 8 (discharge guides 9a and 9b).
Side), the distance between the leading end of the recording paper 1 and the heating element of the thermal head 8 (that is, the distance between the leading end of the recording paper 1 and the recording start position) becomes longer, and recording is performed in this portion. Can not do it. Therefore, there are many portions that cannot be recorded on the recording paper 1, and there is a problem that a sufficient recording area cannot be secured for the length of the recording paper 1.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, the present invention solves the above-mentioned problems of the prior art, and a platen roller that winds and rotates a recording paper, and transfers the recording paper to the platen roller via transfer paper and the recording paper. A thermal head that presses the recording paper against the platen roller, and a pinch roller that presses the recording paper against the platen roller. in matching the inner than the width of the recording paper
Coaxially held on both outer sides in the axial direction of the platen roller there, the platen roller and the Puratenro of substantially the same diameter
A pair of rings that are rotatable with respect to the roller, and a clamper that can be pressed against the ring. The recording paper sandwiched between the platen roller and the pinch roller is rotated by rotating the platen roller. The recording paper is transported to a clamper, the clamper is pressed against the ring via the recording paper to clamp the recording paper, and the platen roller is rotated by a predetermined amount in a direction opposite to the rotation direction to stretch the recording paper. The present invention provides a recording paper slack removing mechanism characterized in that the recording paper is slackened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mechanism for removing slack of a recording sheet in a printer according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial perspective view showing an embodiment of a printer equipped with a slack removing mechanism for recording paper of the present invention, and FIGS.
Is a side plan view thereof. Also, in FIGS.
4 are given the same reference numerals.

First, in FIG. 3, the recording paper 1 is transported along paper feed guides 2a and 2b by a paper supply means (not shown), and sent between a platen roller 3 and a pinch roller 4, where the leading end of the recording paper 1 is fed. Abuts against the stopper 5 for positioning the motor and stops. Here, the stopper 5 is provided on the guide 6, and is rotatable in a direction substantially perpendicular to the transport direction of the recording paper 1 (a direction perpendicular to the paper surface). Also,
As shown in FIG. 1, both ends of the platen roller 3 are substantially the same as the outer diameter of the platen roller 3 at positions inside the width of the recording paper 1 and outside the transfer paper 7 (non-recording portions). A pair of rings 12 (12a, 12b) each having a diameter and made of an elastic material or a plastic material are rotatably held coaxially. Although only one end of the platen roller 3 is shown in FIG. 1, the ring 12 is also held at the other end (not shown) of the platen roller 3.

Further, an encoder (not shown) is integrally disposed on the shaft at one end of the platen roller 3, and is always stopped at a predetermined position or rotated by a predetermined pulse amount according to a reference signal of the encoder. By the way, recording is started. In addition, a pair of clampers 13 (13a, 13b) that can be pressed against the rings 12a, 12b are provided on a frame of the printer device (not shown), and friction pads 14 (14a, 14b) are provided on the pressed portions.
Are formed. Of course, the clamper 13 and the friction pad 14 are also provided at the other end (not shown) of the platen roller 3.

When the leading edge position of the recording paper 1 is determined,
The pinch roller 4 is pressed against the platen roller 3 and the recording paper 1
Is reliably pinched between the platen roller 3 and the pinch roller 4, and then the stopper 5 is rotated and retracted to a position where it does not hinder the running of the recording paper 1. Then, the platen roller 3 rotates in the direction of the arrow in FIG. 3, and the recording paper 1 is sent between the platen roller 3 and the transfer paper 7 via the guide 6, and further passes through the thermal head 8 and the discharge guide The recording paper 1 is transported to the sides 9a and 9b, and the rotation of the platen roller 3 stops when the leading end of the recording paper 1 passes through the clamper 13.

When the clamper 13 rotates in the direction of the ring 12 as shown in FIG. 2, the clamper 13 comes into pressure contact with the ring 12 via the recording paper 1 and the friction pad 14 and the ring 12 cause the clamper 13 to rotate. Hold both ends. Then, the thermal head 8 slightly separates from the platen roller 3, and the platen roller 3 slightly rotates in the direction opposite to the arrow in FIG. 3 and stops. At this time, since the ring 12 is stopped by the pressing force of the clamper 13 pressed against the recording paper 1, the slack of the recording paper 1 is absorbed. Further, the platen roller 3 is a recording paper 1
Needless to say, the rotation stops in a state where it does not come off from the clamper 13.

Thereafter, the thermal head 8 comes into pressure contact with the platen roller 3, the clamper 13 releases the leading end of the recording paper 1 as shown in FIG. Recording starts when the rotation is completed. The leading end of the recording paper 1 is connected to the paper ejection guides 9a and 9b.
, And the transfer paper 7 is wound in the direction of the arrow via the peeling roller 11 to complete the recording of the first color. At this time, the recording is completed in a state where the rear end of the recording paper 1 is held by the pressure contact between the platen roller 3 and the pinch roller 4.

Thereafter, the thermal head 8 separates from the platen roller 3, and the platen roller 3 rotates in the reverse direction (in the direction opposite to the arrow in FIG. 3), so that the rear end of the recording paper 1 follows the paper feed guides 2a and 2b. When the leading end of the recording paper 1 passes through the stopper 5, the rotation of the platen roller 3 is stopped, and after the stopper 5 returns to the initial state, that is, the state of FIG. It is separated from the roller 3. The leading end of the recording paper 1 that has become free due to the separation of the pinch roller 4 hits the stopper 5 by its own weight, the leading end is automatically positioned, and the platen roller 3 again rotates to the predetermined position and stops.

By the above-described repetition, transfer recording of a plurality of colors is performed, and after the final recording is completed, the thermal head 8 is printed.
Is separated from the platen roller 3, and at the same time, the recording paper 1 is discharged to a predetermined position by rotation of a discharge roller (not shown). After the thermal head 8 separates, the platen roller 3 rotates to the initial set position and stops, and the pinch roller 4 also separates from the platen roller 3. Further, the stopper 5 also returns to the state shown in FIG. 3 and is ready for the next transfer recording.

[0018]

[Effect of the Invention] As described in detail above, the mechanism for removing the slack of the recording paper according to the present invention is provided inside the width of the recording paper.
And are coaxially held on both axial outsides of the platen roller.
In addition, for platen rollers of approximately the same diameter as the platen roller
A pair of rotatable rings and a
With a ramper, to absorb the slack of the recording paper
To the non-recording part in the width direction of the recording paper,
Also, in the recording paper transport direction, the thermal head
It can be placed very close to the heating element, so
The parts that cannot be recorded can be extremely reduced,
A recording area for paper can be effectively secured. And plastic
Recording paper sandwiched between ten roller and pinch roller
Is transferred to the clamper by rotating the platen roller,
Press the clamper against the ring via the recording paper to remove the recording paper.
Hold the platen roller in the opposite direction to its rotation.
Since it is configured to stretch the recording paper by rotating it by a predetermined amount,
The slack of the recording paper is removed well.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an embodiment of a recording paper slack removing mechanism of the present invention.

FIG. 2 is a side view showing one embodiment of the slack removing mechanism of the recording paper of the present invention.

FIG. 3 is a side view showing an embodiment of the slack removing mechanism of the recording paper of the present invention.

FIG. 4 is a side view showing a conventional slack removing mechanism for recording paper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording paper 3 Platen roller 4 Pinch roller 7 Transfer paper 8 Thermal head 12 (12a, 12b) Ring 13 (13a, 13b) Clamper 14 (14a, 14b) Friction pad

 ────────────────────────────────────────────────── ─── Continuation of the front page Examiner Takashi Yoshimura (56) References JP-A-63-11370 (JP, A) JP-A-61-173357 (JP, U) JP-A-2-117152 (JP, U) 63-25953 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] A platen roller that winds and rotates a recording sheet, a thermal head that presses the platen roller through a transfer sheet and the recording sheet, and a pinch roller that presses the recording sheet against the platen roller. the provided, a slack removing mechanism of the recording paper in the printer apparatus for recording by transporting the recording sheet in the forward and reverse directions with the platen roller, the platen roller an inner than the width of the recording paper
A pair of rotatable rollers, which are coaxially held on both outer sides in the axial direction and are rotatable with respect to the platen roller having substantially the same diameter as the platen roller
And ring, the ring is more configuration and pressure capable clamper, the recording sheet is pinched between the platen roller by said pinch roller, and transferred to the clamper by rotating the platen roller, wherein said clamper Pressing the recording paper through the recording paper and pressing the ring,
A slack removing mechanism for recording paper, wherein the recording paper is stretched by rotating the platen roller by a predetermined amount in a direction opposite to the rotation direction.