JP2530605Y2 - Thermal transfer recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a thermal transfer recording apparatus for transferring and recording images, characters, and the like on recording paper, and particularly to a recording paper holding mechanism.

(B) Conventional technology As a color hard copy that is relatively easy to maintain, a recording apparatus that sequentially heat-transfers to a recording paper using a color ink sheet to which three colors of yellow, magenta, and cyan are sequentially applied to record is attracting attention. ing.

FIG. 7 shows a main part of a conventional general thermal transfer recording apparatus. In the figure, an end of a recording paper (2) wound around a platen (1) is held by a platen (1) and a holding claw (3). Platen (1)
An elastic layer (4) made of silicon rubber or the like is provided on the surface. The recording paper (2) and the ink sheet (6) are placed between the platen (1) and the thermal head (5), and recording is performed by pressing the thermal head (5) against the platen (1). When the thermal head (5) is pressed, the elastic layer (4) bends and the pressure distribution at the contact portion becomes uniform.
In this state, when a heat-generating portion (not shown) of the thermal head (5) is selectively heated, a heat-fusible or heat-sublimable ink layer (7) provided on the surface of the ink sheet (6).
Is melted or sublimated and transferred to the surface of the recording paper (2). When the platen (1) is rotated in the direction indicated by the arrow a, the recording paper (2) and the ink sheet (6) move together,
A record is made.

In order to record a plurality of colors, the recording may be performed using the ink layer (8) having a different color on the surface of the ink sheet (6). At this time, the drum position at the time of recording is controlled so that the recording position of each color matches on the recording paper (2). When a signal to be recorded becomes a high-density signal such as a video signal or the like, a slight recording deviation causes a serious defect in recording image quality.

Therefore, the platen (1) and the recording paper (2) need to be in close contact with each other during recording of each color. Therefore, the end of the recording paper (2) is placed on the platen (1) by a paper pressing bar. Means for holding using (3) is usually provided.
As these conventional examples, those disclosed in JP-A-57-150271 and JP-A-62-12758 are known.

(C) Problems to be Solved by the Invention In the conventional holding mechanism, the platen is provided with a notch or the like, and the end of the recording paper is held on the platen by a paper holding bar at the notch. . For this reason, the conventional holding mechanism has a drawback that the cost of the apparatus increases because the platen needs to be cut out.

An object of the present invention is to solve the above-mentioned disadvantages and to provide an inexpensive and highly reliable thermal transfer recording apparatus.

(D) Means for Solving the Problems The thermal transfer recording apparatus according to the present invention comprises a cylindrical platen which is rotatable around a recording paper wound around an outer periphery thereof, and a plate which is rotatably attached to a platen shaft of the platen. A presser bar for pressing and holding the recording paper at a predetermined position on the platen; an operating plate connected to the presser bar and movably mounted on the platen shaft in a circumferential direction and a radial direction; A biasing spring that is stretched between a plate and the plate body and biases the operating plate in a direction in which the paper press bar presses against the platen peripheral surface; and a control cam that moves the operating plate in the vertical direction. ,
A cam follower provided on the operation plate and in contact with the control cam, a positioning pin located on the outside of the paper press bar and provided on the operation plate, and a positioning pin provided on the operation plate and opposite to the paper press bar; A tongue piece formed by projecting from the platen peripheral surface and swingably provided with respect to the operation plate, is separated from the operation plate at the time of recording, and engages with the positioning pin at the time of paper feeding to perform the operation. A support arm that inhibits rotation of the plate and engages with the tongue piece during ejection to inhibit rotation of the operation plate, and controls the control with the support arm engaged with the positioning pin during paper feeding. Operating the cam, pressing and holding the recording paper on the platen by the paper holding bar, operating the control cam in a state where the support arm is engaged with the tongue piece at the time of discharging, and pressing the paper holding bar. From the platen It is to, characterized in that between.

(E) Operation In the present invention, the rotation of the operating plate connected to the paper press bar is prohibited during recording paper supply and discharge, and the recording paper can be easily inserted or discharged between the platen and the paper press bar. The mechanism for moving the paper press bar up and down is attached to the platen shaft, and it is not necessary to perform special processing on the platen.

(F) Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view of the present invention, FIG. 2 is a front view of the plate of the present invention, and FIGS. 3 to 6 are side views showing different states of the present invention.

In the figure, a platen (1) has a platen shaft (11) rotatably supported by a main body (not shown) of a recording apparatus, and is rotated forward and backward by a motor (not shown). This platen (1)
The recording paper holding mechanism, which is a feature of the present invention, is attached to both ends of the recording paper.

The recording paper holding mechanism of the present invention includes a paper holding bar (3), a plate (13), an operating plate (14), a biasing spring (15), and a control cam (1).
6), etc. First, the plate (13) is rotatably attached to the platen shaft (11). As shown in FIG. 2, the plate (13) has a hole (20) slightly larger than the base (12) of the platen shaft (11).
The hole (20) and the base (12) are rotatably mounted. The plate (13) is integrally provided with guides (21) and (21) for vertically guiding a slider (18) attached to an operation plate (14) described later. Further, the plate (13) is provided with a pin (2
2) and (22) are provided.

A paper press bar (3) for pressing and holding the recording paper on the platen (1) is provided continuously to the pair of operating plates (14) and (14). A pair of operating plates (14) and (14) are provided so as to be movable in a circumferential direction and a radial direction with respect to the platen shaft (11).
A slot (19) is provided. The sliders (1) having the same long holes as the long holes (19) are formed on the operation plates (14) and (14).
8) is fixed with a screw or the like in a state where the elongated holes of the slider portion (18) and the elongated holes (19) of the operating plate (14) are aligned.

When the operation plate (14) is mounted on the platen shaft (11), the slider portion (18) is slidably disposed on the guide portions (21, 21) of the plate body (13). And serves as a guide when the operating plate (14) moves in the radial direction.

A pair of biasing springs (15) and (15) are stretched between the operating plate (14) and the plate (13).
By the biasing force of (15), the paper holding bar (3) is pressed against the peripheral surface of the platen (1).

The main body is provided with a control cam (16) that is rotated by a motor (not shown), and the control cam (16) comes into contact with a cam follower (17) implanted in the operation plate (14).
By the operation of the control cam (16), the operation plate (14) moves in the radial direction of the platen (1), and the paper holding bar (3) moves toward and away from the platen (1).

When the paper holding bar (3) is pressed against the platen (1), the paper holding bar (3), the operating plate (14),
And the plate (13) rotates with the platen (1). And
When the paper press bar (3) is separated from the platen (1), only the platen (1) rotates.

Further, a support arm (30) provided with a locking portion (31) at the tip is attached to the main body so as to be swingable about a shaft (32). During recording, the support arm (30) is retracted in a direction away from the operation plate (14). Further, at the time of supply / discharge, the locking portion (31) of the support arm (30) engages with the positioning pin (33) or the tongue piece (34) provided on the operation plate (14).

The positioning pin (33) of the operation plate (14) is provided outside the paper holding bar (3), and the operation plate (14)
Prohibit rotation of. The tongue piece (34) of the operation plate (14) is formed so as to protrude from the peripheral surface of the platen (1) on the side opposite to the paper holding bar (3). Prohibit rotation.

 Next, the operation of the present invention will be described.

3 and 4 are side views showing the paper feeding state.
In the paper feeding state, first, as shown in FIG.
In step 6), the paper holding bar (3) is set to a position about 2 mm away from the platen (1) against the biasing springs (15) and (15). Then, the support arm (30) is disposed at a position close to the operation plate (14), and the locking portion (31)
And the positioning pin (33) are engaged, and the rotation of the operation plate (14) is prohibited.

In this state, the recording paper (2) sent from the paper guides (35) and (35) and the paper feed rollers (36) and (36) moves between the platen (1) and the paper press bar (3). Inserted.

Subsequently, as shown in FIG. 4, the control cam (16) rotates, and the recording paper (2) is pressed and held on the platen (1) by the urging force of the urging spring (15). Further, the support arm (30) moves in a direction to retract from the operation plate (14), and the engagement between the positioning pin (33) and the locking portion (31) is released.
In this state, the recording paper (2) and the platen (1) are integrated, and thereafter, are transferred to the recording paper (2) in the order of yellow, magenta, and cyan.

The case where the recording is completed and the recording paper (2) is discharged will be described with reference to FIGS.

First, when recording is completed, the support arm (30) moves to a position close to the operation plate (14), and the platen (1) rotates. Then, as shown in FIG. 5, the tongue piece (34) of the operating plate (14) is engaged with the locking portion (31), and the paper pressing bar (3) holding the recording paper (2) is It is set to a position shifted 180 degrees from the time of paper feeding. Next, as shown in FIG. 6, the control cam (16) rotates, and the paper holding bar (3) is moved to the platen (1).
From a distance of about 2 mm. Then, the platen (1) is rotated, and the recording paper (2) is discharged.

(G) Effects of the Invention As described above, according to the present invention, when the control cam is operated to supply and discharge the recording paper, the rotation of the operating plate connected to the paper holding bar is prohibited, and the recording paper is inserted. Alternatively, it is possible to reliably hold and release the recording paper at a predetermined position without rotating the operation plate due to the operation of the control cam when discharging.

Therefore, the recording paper can be securely held on the platen with a very simple structure without any processing on the platen, and a thermal transfer recording apparatus which is inexpensive and has high recording paper conveyance accuracy can be provided.

[Brief description of the drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a front view showing a plate used in the present invention, and FIGS. FIG. 3 and FIG. 4 show side views showing different states of the invention, and FIG. 5 and FIG. 6 show a paper discharge state. FIG. 7 is a perspective view showing a conventional thermal transfer recording apparatus. DESCRIPTION OF SYMBOLS 1 ... Platen, 2 ... Recording paper, 3 ... Paper press bar, 5 ... Thermal head, 6 ... Ink sheet, 11 ... Platen shaft, 13 ...
Plate, 14 ... Working plate, 15 ... Bias spring, 16 ... Control cam, 17 ...
Cam follower, 18 ... Slider part, 19 ... Long hole, 21 ... Guide part, 30 ... Support arm, 31 ... Locking part, 33 ... Positioning pin,
34 ... a tongue.

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical platen which is rotatable around a recording paper wound around an outer periphery, a plate body rotatably mounted on a platen shaft of the platen, and presses the recording paper at a predetermined position on the platen. A paper presser bar to be held, an operating plate connected to the paper presser bar, and attached to a platen shaft so as to be movable in a circumferential direction and a radial direction, being stretched between the operating plate and the plate body, An urging spring for urging the operating plate in a direction in which the paper pressing bar presses against the peripheral surface of the platen; a control cam for moving the operating plate in the vertical direction; and a control cam provided on the operating plate and in contact with the control cam. A cam follower, a positioning pin provided on the operation plate, located outside the paper press bar, and a projection pin formed on the operation plate, protruding from the platen peripheral surface on the opposite side of the paper press bar. A tongue piece and the operating plate The recording plate is slidably provided, and is separated from the operation plate at the time of recording, engages with the positioning pin at the time of paper feeding, prohibits rotation of the operation plate, and engages with the tongue at the time of paper ejection to perform the operation. A support arm that inhibits rotation of the plate.When feeding paper, the control cam is operated in a state where the support arm is engaged with the positioning pin, and the recording paper is pressed and held on the platen by the paper pressing bar. The thermal transfer recording apparatus, wherein the control cam is operated in a state where the support arm is engaged with the tongue piece when the paper is discharged, and the paper pressing bar is separated from the platen.