JPH0624212Y2 - Printer paper holding mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper holding mechanism of a printer that holds a recording paper on a platen during printing.

BACKGROUND ART A typical prior art is shown in FIG. A conventional color printer 2 that sequentially transfers a plurality of inks onto a recording paper 1 holds the recording paper 1 between a platen 3 and a pressure roller 4 that is pressed against the platen 3, and reciprocates the recording paper 1 a plurality of times. A plurality of types of ink applied to the ink sheet 5 is used as the recording paper 1
Are sequentially transferred to.

Problems to be Solved by the Invention In the above-mentioned prior art, the recording paper 1 reciprocates only by being sandwiched between the platen 3 and the pressure-bonding roller 4.
There is a drawback in that the color shift occurs on the print screen due to the shift of the color.

An object of the present invention is to provide a color printer which solves the above-mentioned technical problems and is capable of obtaining a clear print screen without color shift.

MEANS FOR SOLVING THE PROBLEMS The present invention (a) is a right circular cylinder in which the entire recording paper 11 cut to a predetermined size is wound and is rotatable around a shaft 50 in one rotation direction and the opposite direction. Platen 12 of the platen 12, and (b) the platen 12 on the end surface 12 a of the platen 12.
Two guide pins 22a, 22b which are provided to project laterally on one diameter line and on both sides with respect to the shaft 50, and (c) a holding portion 19 which is arranged on a side portion of the platen 12. A first guide elongated hole 20 is formed which extends in one diametrical line direction and in which the shaft 50 is loosely fitted. The first guide elongated hole 20 extends in the one diametrical line direction of the platen 12 along the longitudinal direction of the first guide elongated hole 20 and each guide pin 22a. , 22b are formed with two second guide slots 21a, 21b, respectively, which are loosely fitted to each other, so that the holding portion 19 is displaceable relative to the platen 12 in the diametrical direction of the platen 12.
And (d) a holding portion 18 fixed to the holding portion 19 near one of the second elongated guide holes 21a for holding the recording paper 11 on the outer peripheral surface of the platen 12, and (e) the side of the platen 12 described above. Is a release lever 16 disposed on the platen, the shaft 50 is inserted therethrough, and is rotatable with respect to the shaft 50. The platen 12 is provided on the upstream side in the one rotation direction with respect to the one second guide elongated hole 21a. Release lever 16 provided on 31, 32 displaceable relative to the holding portion 19 in the radial direction of the
(F) between the release pin 33 projecting from the release lever 16 on the downstream side in the one rotation direction with respect to the one second elongated guide hole 21a, and (g) between the holding portion 19 and the release lever 16. Intervened,
A spring 15 for urging the release lever 16 toward the upstream side in the one rotation direction with respect to the holding portion 19, and (h) the platen 12 is stopped at the supply position of the recording paper 11 in the one rotation direction. An operating lever 17 having a pressing portion 73 facing the downstream side and pressing the release pin 33 against the biasing force of the spring 15 by this pressing portion 73, and (i) printing on the recording paper 11 on the outer peripheral surface of the platen 12. And a means (60) for driving the platen 12 in the one rotation direction at the time of printing and for driving the platen 12 in the opposite direction after the printing is completed. When the platen 12 is rotated in the reverse direction after printing is completed, the release pin 33 contacts the pressing portion 73 of the operation lever 17, and the platen 12 is rotated in the reverse direction. By rotating in the direction, the release pin 33 is pressed by the pressing portion of the operation lever 17, the release lever 16 rotates relatively to the platen 12, and the holding member 19 moves in the direction in which the holding portion 18 is separated from the platen 12. The recording paper holding mechanism of the printer is characterized in that the holding of the recording paper 11 is released.

Operation According to the present invention, the recording paper 11 cut into a predetermined size is wound around the outer peripheral surface of the platen 12 having a right cylindrical shape, and the platen 12 has the holding portion 19, the holding portion 18, the release lever 16 and the holding portion 19. Since the recording paper 11 is fixed to the platen 12 by attaching a spring 15 and the like, the recording paper 11 is fixed to the platen 1.
It is possible to prevent the relative displacement from 2, and therefore, it is possible to accurately print at a desired position on the recording paper 11 by the printing means 13 and 60.

Embodiment FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. The holding mechanism 10 according to the present invention basically includes a platen 12 having a right cylindrical shape around which a recording paper 11 cut into a predetermined size is wound, an ink sheet 13 coated with a plurality of types of ink, and a platen 12. A holding member 14 for holding the recording paper 11 in cooperation with each other, a torsion spring 15 as a biasing means for biasing the holding member 14 so as to always press the holding member 14 in the platen direction, and a release for separating the holding member 14 from the platen 12. Lever 16 and release lever 1
An operation lever 17 for operating 6 is included.

The holding member 14 includes a holding portion 18 which is arranged on the outer peripheral surface of the platen 12 and holds the recording paper 11, and a holding portion 19 which holds the holding portion 18. The holding portion 19 is formed in a substantially cross shape and is composed of portions 19a, 19b, 19c and 19d. The holding portion 19 has a portion 19a at the center thereof.
Guide elongated hole 20 extending in a virtual straight line connecting the portion 19c and the portion 19c
Are formed. The platen 1 is provided in the guide slot 20.
The second shaft 50 is loosely fitted. Guide slots 21a and 21b extending in the virtual linear direction are formed in the portions 19a and 19c. A spring hooking pin 30 is formed on the portion 19b so as to project laterally. A guide pin 31 protruding laterally is formed on the portion 19d.

Two guide pins 22 are provided on the end surface 12a of the platen 12.
a and 22b are provided so as to project laterally. The guide pins 22a and 22b are located on one diameter line of the end surface 12a of the platen 12. These guide pins 22a, 22
In b, the guide elongated holes 21a and 21b are loosely fitted. Therefore, the holding portion 19 is guided by the elongated guide holes 21a and 21b,
Therefore, the holding portion 18 contacts the outer peripheral surface of the platen 12,
It can be separated and displaced.

The release lever 16 is rotatable coaxially with the shaft 50 of the platen, has a guide slot 32 loosely fitted in the guide pin 31 at one end, and is operated by the operation lever 17 at the other end. The release pin 33 is projected. Torsion spring 15
Is hooked on the release pin 33 and the spring hooking pin 30.

An ink sheet 13 is arranged near the platen 12. One end of the ink sheet 13 is wound around the supply reel 45, and the other end is wound around the take-up reel 46. On the ink sheet 13, pigment areas M1, M2 ... (Indicated by reference numeral M when collectively referred to) are formed in which a plurality of types of ink are applied along the longitudinal direction.

On the side opposite to the platen 12 with respect to the ink sheet 13,
A thermal head 60 is provided. The thermal head 60 has a plurality of heating elements 60 a arranged in a straight line in the axial direction of the platen 12. When printing,
The heating element 60a is selectively heated to generate the ink sheet 13
Ink is applied to the recording paper 11.

In the above structure, the platen 12, the sandwiching member 14, the release lever 16, the torsion spring 15, etc. rotate integrally. The platen 12, the sandwiching member 14, the release lever 16, the torsion spring 15, and the like are configured not only in the end surface 12 a of the platen 12 but also in the platen 1.
It is also provided on the other end face 12b of No. 2.

Before the recording paper 11 is supplied, the release pin 33 is operated by the operation lever 17 while the platen 12 is stopped, and the release lever 16 is rotated against the urging force of the torsion spring 15 to hold the holding portion. The gripping portion 18 is separated from the platen 12 by sliding 19. Such a state is shown in FIG. In this state, the recording paper 11 is inserted between the platen 12 and the sandwiching portion 18.

Next, when the platen 12 is rotated slightly clockwise, the release pin 33 is separated from the operation lever 17, and the torsion spring 1
The nipping portion 18 nips the leading end of the recording paper 11 by the biasing force of 5, as shown in FIG. While the platen 12 is rotating, the operation lever 17 is retracted around the pin 71 in the counterclockwise direction of FIG. 1 to a position indicated by a virtual line 72 so as not to contact the release pin 33. This is as indicated by the solid line of the operating lever 17 in FIG. Thereafter, as the platen 12 rotates, the recording paper 11 is gradually changed to the platen 1
The thermal head 60, which is wound around 2, is the print start position.
When the proximity is reached, the thermal head 60 moves the platen 1
Displace toward 2. As a result, the recording paper 11 and the ink sheet 13 are pressed against the outer peripheral surface of the platen 12. The heating element 60 _a of the thermal head 60 is selectively heated, for example cyan ink dye area M1 is applied to the recording paper 11 in dot units.

The recording paper 11 is kept wound around the platen 12 by the pressure rollers 40 and 41.

When the platen 12 makes one rotation and the leading end of the recording paper 11 reaches the printing start position again, the ink sheet 13 is conveyed so that the leading end of the next dye area M2 reaches the printing start position. Therefore, when the platen 12 is driven to rotate for the second time, for example, magenta ink in the dye area M2 is applied onto the cyan image on the recording paper 11. In this way, while the platen 12 rotates in the same direction, a plurality of inks are sequentially transferred.

When the platen 12 is rotated counterclockwise after the transfer is completed, the recording paper 11 is sent to the paper discharge path (not shown), and the operation lever 17 is rotated around the pin 71 in the clockwise direction in FIG. It is displaced and stands by at a position where it can contact the release pin 33. When the platen 12 reaches a predetermined position, the release pin 33 comes into contact with the operation lever 17, the nipping portion 18 separates from the platen 12, and the nipping state of the recording paper 1 is released, so that the recording paper 11 can be taken out. The sheet is discharged by a sheet discharging unit (not shown).

In this embodiment, the operating lever 17 is separated from the release pin 33 while the platen 12 is rotating, that is, the operating lever 17 is angularly displaced in the counterclockwise direction in FIG. Although shown (the separating means is not shown), when the platen 12 is rotated in the clockwise direction in the drawing, the releasing pin 33 may automatically separate from the releasing pin 33.

To further describe the configuration of the above-described embodiment, the two guide pins 22a and 22b are provided on the end surface 12a (see FIG. 2) of the platen 12 on a single diameter line extending vertically in FIG. 1 of the platen 12, Further, it is provided so as to project laterally on both sides (that is, the upper side and the lower side of the shaft 50) with respect to the shaft 50. Holding part 1
9 is arranged on the side of the platen 12 and has a guide slot 2
0 extends in the direction of the one diameter line, and the shaft 50 loosely fits as described above. The guide slots 21a and 21b extend in the direction of the one diameter line of the platen 12 along the longitudinal direction of the guide slot 20, that is, the guide slots 22a and 22b, respectively. To play fit. As a result, the horizontal axis 19 can be displaced in the direction of the one diameter line of the platen 12, that is, in the vertical direction of FIG.

The holding portion 18 is fixed to the holding portion 19 near one of the guide elongated holes 21a.

The release lever 16 is disposed on the side portion of the platen 12, and the shaft 50 is inserted therethrough and is rotatable relative to the shaft 50. A guide elongated hole 32 is formed in the release lever 16,
The guide pin 31 is loosely fitted into the guide slot 32, so that the platen 12 is located upstream (left in FIG. 1) in the one rotation direction (clockwise in FIG. 1) with respect to the guide slot 21a.
Is configured to be displaceable relative to the holding portion 19 in the radial direction. The release pin 33 projecting from the release lever 16 is arranged on the downstream side (right side in FIG. 1) in the one rotation direction with respect to the guide elongated hole 21a.

The spring 15 is interposed between the pins 30 and 33 as described above, in other words, interposed between the holding portion 19 and the release lever 16, and the spring 15 causes the release lever 16 to move with respect to the holding portion 19. The spring is biased to the upstream side (that is, the counterclockwise direction in FIG. 1) of the one rotation direction (clockwise direction in FIG. 1).

The operation lever 17 has a pressing portion 73 that faces the release pin 33 to the downstream side of the one rotation direction (that is, the clockwise direction in FIG. 1) while the platen 12 is stopped at the supply position of the recording paper 1.
Have. The pressing portion 73 presses the release pin 33 against the biasing force of the spring 15. Although the drawing does not show the means for driving the platen 12 to the printing position in the one rotation direction and for driving the platen 12 in the opposite direction after the completion of printing, such a driving means does not drive the shaft 50 of the platen 12. It can be easily realized by a configuration including a driving motor or the like.

As described above, according to the present invention, the holding portion 19, the holding portion 18, and the release lever are provided on the platen 12 having a right cylindrical shape in which the entire recording paper 11 cut to a predetermined size is wound around the outer peripheral surface. 1
6 and the spring 15 are provided, and therefore, there is no problem that the recording paper 11 and the platen 12 are relatively displaced from each other, and the printing means 13 and 60 print on the recording paper 11 at a desired accurate position. It becomes possible to do. As a result, for example, a platen having a configuration in which a plurality of types of ink are sequentially transferred to the recording paper 11 for each rotation of the platen 12 can obtain a good image without color misregistration, and such a plurality of types of ink can be used. Even when printing with a kind of ink without using the recording paper 1 as described above
It is possible to print at an accurate position of 1.

Further, according to the present invention, the platen 12 is driven in one rotation direction at the time of printing by the driving means, so that the release pin 33 is separated from the pressing portion 73 of the operation lever 17, so that the release lever 16 is moved by the spring force of the spring 15. The holding portion 19 is displaced in the direction of one diameter line of the platen 12 and the holding portion 1 is held.
The recording paper 11 can be sandwiched by the outer peripheral surface of the platen 12 by the means 8. Printing is performed by rotating the platen 12 in the one rotation direction by less than 360 degrees, for example, and after the printing is completed, the platen 12 is driven by the driving means in the direction opposite to the one rotation direction (counterclockwise direction in FIG. 1). When the release pin 33 is driven, the release pin 33 comes into contact with the pressing portion 73 of the operating lever 17, and the platen 12 further moves in the reverse direction against the biasing force of the spring 15 with the release pin 33 in contact with the pressing portion 73. The angular displacement of the holding lever 19 causes the holding portion 19 to move upward in FIG. 1 in the direction of the one diameter line by the angular displacement of the holding lever 18 and the holding portion 18 to the recording paper 11 between the outer peripheral surface of the platen 12. Release the clamped state of. In this way, by the angular displacement of the platen 12 in the one rotation direction and in the opposite direction, the sandwiching state of the recording paper 1 by the sandwiching portion 18 can be achieved, or the sandwiched state can be released. Therefore, when the platen 12 is rotated by less than 360 degrees as described above and printing is performed, the operation lever 17 may be held at the position shown by the solid line in FIG. 1, that is, it is not necessary to retract. The excellent effect of simple construction is achieved. Further, in order to sequentially transfer a plurality of types of ink to the recording paper 11, the operating lever 17 is retracted to the position shown by the virtual line 72 in FIG. Also in the configuration in which the operation lever 17 is returned to the position shown by the solid line in FIG. 1, the recording paper 1 on the outer peripheral surface of the platen 12 by the sandwiching portion 18 by angularly displacing the platen 12 in the opposite direction as described above. The pinching can be released, and even in such a configuration, the configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a side view showing a state where recording paper 11 is held by a holding member 14, and FIG. FIG. 3 is a schematic diagram showing a main part of the printer of FIG. 10 ... Holding mechanism, 11 ... Recording paper, 12 ... Platen, 13
... Ink sheet, 14 ... Clamping member, 15 ... Torsion spring, 16 ... Release lever, 17 ... Operating lever, 18 ... Clamping part, 19 ... Holding part, 33 ... Release pin, 40, 41 ... Crimping roller, 60 ... Thermal head

Claims (1)

[Scope of utility model registration request] 1. A recording paper 11 cut into a predetermined size.
Of the platen 12 which is wound around the shaft 50 and is rotatable around the shaft 50 in one rotation direction and in the opposite direction, and (b) on the end surface 12a of the platen 12, the platen 12
Two guide pins 22a, 22b which are provided to project laterally on one diameter line and on both sides with respect to the shaft 50, and (c) a holding portion 19 which is arranged on a side portion of the platen 12. A first guide elongated hole 20 is formed which extends in one diametrical line direction and in which the shaft 50 is loosely fitted. The first guide elongated hole 20 extends in the one diametrical line direction of the platen 12 along the longitudinal direction of the first guide elongated hole 20 and each guide pin 22a. , 22b are formed with two second guide slots 21a, 21b, respectively, which are loosely fitted to each other, so that the holding portion 19 is displaceable relative to the platen 12 in the diametrical direction of the platen 12.
And (d) a holding portion 18 fixed to the holding portion 19 near one of the second elongated guide holes 21a for holding the recording paper 11 on the outer peripheral surface of the platen 12, and (e) the side of the platen 12 described above. Is a release lever 16 disposed on the platen, the shaft 50 is inserted therethrough, and is rotatable with respect to the shaft 50. The platen 12 is provided on the upstream side in the one rotation direction with respect to the one second guide elongated hole 21a. Release lever 16 provided on 31, 32 displaceable relative to the holding portion 19 in the radial direction of the
(F) between the release pin 33 projecting from the release lever 16 on the downstream side in the one rotation direction with respect to the one second elongated guide hole 21a, and (g) between the holding portion 19 and the release lever 16. Intervened,
A spring 15 for urging the release lever 16 toward the upstream side in the one rotation direction with respect to the holding portion 19, and (h) the platen 12 is stopped at the supply position of the recording paper 11 in the one rotation direction. An operating lever 17 having a pressing portion 73 facing the downstream side and pressing the release pin 33 against the biasing force of the spring 15 by this pressing portion 73, and (i) printing on the recording paper 11 on the outer peripheral surface of the platen 12. And a means (60) for driving the platen 12 in the one rotation direction at the time of printing and for driving the platen 12 in the opposite direction after the printing is completed. When the platen 12 is rotated in the reverse direction after printing is completed, the release pin 33 contacts the pressing portion 73 of the operation lever 17, and the platen 12 is rotated in the reverse direction. By rotating in the direction, the release pin 33 is pressed by the pressing portion of the operation lever 17, the release lever 16 rotates relatively to the platen 12, and the holding member 19 moves in the direction in which the holding portion 18 is separated from the platen 12. The recording paper holding mechanism of the printer is characterized in that the holding of the recording paper 11 is released.