JPS60105565A - Ink film winding mechanism for printer - Google Patents

Abstract

PURPOSE:To arrange so that ink film passing through a printing section may be taken up without any sag by taking up ink film, with an auxiliary belt which slips at a torque above a fixed level, at higher speed than when the belt is wound. CONSTITUTION:A belt 53 is set around a pulley 55 of a shaft 52 and a driven pulley 56, 57, and takes up ink film 22 supported by a supporting shaft on the winding side. In addition, an auxiliary belt 54 is stretched around the pulley 58 of the shaft 52 and driven pulleys 59, 60, and is pressed against a V groove 61' of a supporting shaft flange between pulleys 59, 60. Thus ink film 22 is taken up. In this case, if pulleys 55 and 58, 56 and 59, 57 and 60 are of the same diameter, the winding speed of the auxiliary belt 54 is higher than that of the belt 53, resulting in faster rotation of a winding core than the ink film 22. Further, the auxiliary belt 54 is so set as to slip at a torque above a fixed level, thus enabling the ink film to be taken up at proper tension and without any sag.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a printer such as a thermal printer that prints while winding an ink film, and particularly relates to an ink film winding mechanism.

BACKGROUND OF THE INVENTION The ink film used in this type of printer is constructed by applying ink to the surface of a thin plastic film.

≠The single winding mechanism is shown in Figure 1. In the figure, 1 is an ink film, and 2 is a belt for winding up the ink film. The ink film 1 passes through a printing section (not shown) on the left side of the figure, is unwound as indicated by an arrow, and is wound onto a core (not shown) attached to a winding-side support shaft 3. The belt 2 includes a pulley 5 fixed to a drive shaft 4 and a driven pulley 6.
．． 7 and the hook are crossed and driven by the drive shaft 4 to travel in the direction of the arrow. This belt 2 winds up the ink film 1 by being pressed between the driven pulleys 6.7 of the ink film 1 around which the core is wound.

However, this conventional mechanism has the disadvantage that slippage occurs between the belt 2 and the ink film and between the ink films, and as a result, the winding of the ink film becomes loose.

purpose of invention The present invention aims to solve the above-mentioned drawbacks.

It is an object of the present invention to provide an ink film winding mechanism capable of winding up a used ink film that has passed through a printing section without loosening.

Structure of the Invention In the present invention, in addition to the belt that winds up the ink film by pressing against the outer periphery of the ink film supported in a coil shape on the first winding side support shaft, the above-mentioned auxiliary belt that slips in response to a constant torque is provided. The above object is achieved by winding the ink film around the support shaft and winding the ink film using the auxiliary belt at a speed faster than the winding speed of the belt.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to FIGS. 2 to 6.

Overall outline of a color thermal printer to which the present invention is applied (
(film magazine omitted) is shown in FIG. The color thermal printer includes a first support member 12 that rotatably supports a pair of guide rollers 11, and a second support member 14 that rotatably supports a platen 13. Inside the machine frame 15 equipped with various drive systems (details will be described later), '! It is constructed by removably mounting a film magazine 16 whose details are shown in Figure J5.4.

The support member 12 includes a pair of arms 17 that rotatably support the pair of guide rollers 11 on both sides, and the base of the arm 170 is rotatably supported by the machine frame 15 via a support shaft 18. There is.

The base of the arm 19 is rotatably supported by the machine frame 15 via a support shaft 2o.

As shown in detail in FIGS. 3 and 4, the film magazine 16 stores an ink film 22 (see FIG. 4), which is indicated by a dotted line, in a magazine body 21 so that it can be fed out and wound up. It is provided with a pair of side plates 23.The side plates 26 have flanges 24, 24'+25
, 25' are rotatably supported, and the flanges 24 and 25 are provided near one end of the side plate 23.
5' are located near the hydraulic end of the side plate 23 and are opposed to each other on the same axis. The flanges 24, 24' are biased inwardly as shown by the arrows by springs 26, 26' and can move in the axial direction, while the flanges 25, 25' do not move in the axial direction and can be moved in the one-way clutch 27,
Due to the action of 27', when the side plate 23 is rotated clockwise when viewed from the outside, there is resistance, and when it is rotated in the opposite direction, it can be rotated without resistance. As is clear from FIG. 6, the magazine main body 21 having such a configuration has a central
1, which plays an effective role in the case of using a reusable ink film, as will be described later. The ink film 22 is wound around the hollow winding core 28, and is rolled out between the flanges 24 and 25 as shown in Figure 4.
4', 25', and is wound around the winding core 29 by rotating the winding core 29 counterclockwise in FIG. 4 as described later. In this case, the winding core 28 is driven by the ink film 22 wound around the winding core 29 and rotates, but the ink film 22 unwound from the winding core 28 is slack due to the resistance of the one-quake crack F-27 against this rotation. Moreover, since there is no resistance from the one-way Clara f27', the ink film 22 can be smoothly fed out and taken up. In addition,
When using a reusable ink film, take advantage of the fact that the magazine body 21 has a point-symmetric structure, rotate the film magazine 716 1800 times on the paper surface of FIG. 3, and insert it into the machine frame 15 in the opposite direction to that shown in FIG. It is stored and reused, but in this case, the winding core 28 becomes the winding side and the winding core 29 becomes the unwinding side. In this case as well, the ink film 22 is smoothly fed out and wound up.

In order to removably store the film magazine 16 with such five configurations in the machine frame 15, a front stopper 60 is provided in the machine frame 15.
and a rear stopper 31 are provided. The film magazine 16 has its winding side end rotatably engaged with the front stopper 3o, and its unwinding side end removably engaged with the rear stopper 31, so that it can be installed and removed within the machine frame 15. It will be stored.

After storing the film magazine 16 in this manner, the guide roller 11. The paper and platen 13 are set in a printable position, and the setting procedure is as follows.

The guide reeler 11 is set by rotating the support member 12 from the open state shown in FIG. 2 in the closing direction shown by the arrow. Due to this rotation, arm 17g = provided locking piece 52 (W
(See Figure S2) is locked to the machine frame 1 and the guide roller 11 is positioned at a predetermined position.

To set the paper, move the shaft that supports the rolled paper to the machine frame 15.
This is done by supporting the paper roll provided at the support section 53 (see Fig. 2), and passing the rolled paper over the two guide rollers 11 that are set in the upper part as described above, and ejecting the bow 1. .

In addition, the platen 110 set supports the support member 14 in the second position! Closing direction ζ shown by the arrow from the state: Rotate. At the time of this rotation, the inclined surface 55 of the engaging member 54 (see Fig. 32), which is rotatably supported by the machine frame 15, touches the platen 13.
The support member 14 is engaged with the shaft portion of the engagement member 3475E, and rotates in the direction shown by the arrow in FIG. 1 against the biasing force of the engagement member 3475E spring 36. When the shaft portion of the platen 13 passes through the inclined surface 35, the locking portion 57 of the engaging member 34, which is biased by the spring 36, locks the shaft portion of the platen 13 from above, and the shaft portion is attached to the machine frame. It is positioned on the bearing part 38 provided in 15. The platen 15 thus set C2 is placed on the thermal head 39 (see FIG. 2) disposed inside the machine frame 15 with the ink film 22. It is pressed into contact with the paper 51 and also with the two guide rollers 11 set on both sides above the printing section of the thermal head 39 through the paper. At the time of this setting, a gear 40 provided coaxially with the platen 15 meshes with a gear 41 provided on the machine frame 15. The gear 40 is rotated in forward and reverse directions by being driven by a drive system C2 including gears.

When the platen 130 is set, the roller 43 supported by the arm 19 is in pressure contact with the surface 1 of the roll paper set in the machine frame 15.

The structure for supporting this roller 45 and its function are as follows.

That is, as shown in FIG. 2, the roller 43 is rotatably supported by one end of a link 44, and the other end of the link 44 is attached to the shaft of a roller 45 supported by the arms 19, 19. . This roller 45 is connected to the platen 13
Ct
- By providing a one-quake rack in the middle of the power transmission system, power is transmitted to the roller 43 only when the platen 13 rotates in the direction of the arrow (when the paper is fed backwards as described later).
When the platen 16 rotates in the opposite direction, no power is transmitted and the platen 16 can be slid. Note that the circumferential speed of the roller 43 is naturally set to be the same as the circumferential speed of the platen 16. This roller 43 is biased by a spring 50 provided between the U-shaped metal fitting 48 fixed to the link 44 and the metal fitting 49 fixed to the arm 19 when the platen 16 is set twice as described above. The paper roll 510 is pressed against the surface of the rolled paper 510 supported by the support section 33 . Although a detailed explanation will be omitted, the metal fitting 4B serves as a guide to ensure that the roller 43 moves in the direction in which it comes into contact with the rolled paper when the support member 14 is rotated in the closing direction to set the platen 150. It is something that we fulfill.

Printing is possible with all the settings completed in this way.Next, the paper feed and ink film feed during printing will be explained together with the related configurations to be explained later.

When printing with the thermal head, as shown in Fig. 5, the platen 13 is rotated in the forward direction shown by the arrow (opposite direction to the arrow in Fig. 2), and at the same time, the paper is moved forward (as shown by the arrow). , and transport the ink film 22 in the same direction.Since this example is a color thermal printer that prints in multiple colors, the ink film 22 contains Y (yellow), M (magenta), and C (cyan) inks. are continuously applied to a predetermined length in this order, and the first printing is performed in Y color.In this case, the paper 51 is moved to the platen 130 driven by the pulse motor 42 via the drive system as described above. Due to rotation, the paper is transferred in close contact with the platen 13 (by the action of the guide roller 11), and the roller 46 idles in contact with the roll paper 51. Note that detailed illustrations of the supporting portion of the roll paper 51 are omitted. ruru, but
For example, a mechanism is provided that combines a one-way clutch and a frictional force applying means that acts on the outer circumference of the clutch, and when paper is fed out, the one-way clutch is activated and the frictional force applies an appropriate brake to the paper support shaft so that the paper is fed out without slack. (Secondly, when the paper is fed backwards as described later, the one-way clutch is tripped and the paper that is fed backwards is moved by the roller 5.
1 allows for easy winding without sagging. The ink film 22 is transferred by rotating the core 29 shown in FIG. 2), and the rotation of this shaft 52 moves a belt 53 (corresponding to the conventional belt 2) that presses against the outer periphery of the ink film 22 wound around the core 29, as shown in FIG. In FIG. 2, the hatched portion of the belt 56 indicates the portion that comes into pressure contact with the ink film 22 (-).

In this way, Y color printing is performed on the paper while rotating the platen 13 and transporting the paper and ink film. When the Y color printing is completed, the ink film 22 is stopped and the paper 51 is returned to its original position. Reverse feed to . These operations are performed by the following steps.

When Y color printing is completed, the pulse motor 42 is temporarily stopped, and is evacuated by the solenoid 54 (see Fig. 2), which is an idle gear in the ink film drive system, to stop driving the ink film, and then the pulse motor 42 is operated as described above. Reverse direction (rotate two predetermined amounts.

At this time, the stopped shaft 52 is locked by a locking means (not shown).

Next, the idle gear of the ink film drive system is positioned at the operating position, the shaft 52 is unlocked, the pulse motor 42 is rotated forward, and M color printing is started.
The same goes for the rest (=Printing in C color completes printing for one screen.

In order to solve the above-mentioned problems in the thermal printer having the above-mentioned configuration 2, the present invention provides an auxiliary belt 54 in addition to the belt 53, as shown in FIG.

The vent 53 is a pulley 55 fixed to the shaft 52.
and slave boo! + 56 and 57 (the two hooks are passed to wind up the ink film 22 supported by the winding side support shaft as described above).

Further, the auxiliary belt 54 is passed between a pulley 58 fixed to the shaft 52 and driven boobies 959 and 60, and conventionally, between the pulleys 59 and 60, the flange (support shaft) 25
It is in pressure contact with a V-groove 61' (see Fig. 3) formed in the flange 25' and 26', and winds up the ink film 22 wound around the winding core 29 installed between the flanges 25' and 26'. ing. 61 is a V-groove provided in the flange 25.

In this case, pulley 55 and pulley 58. Driven pulley 56 and driven pulley 59. If the driven pulley 57 and the driven pulley 60 have the same diameter (indicated by the diameters of different tools in FIG. 6), the winding speed of the ink film by the auxiliary belt 54 will be higher than that by the belt 56. This means that the radius r1 of the outer periphery of the ink film to be wound is the radius r of the V-groove 61' of the flange 25'! The angle of rotation of the flange 25' by the belt 56 is larger than that of the auxiliary belt 54.
This is because it is smaller than the Therefore, the core around which the ink film is wound rotates faster than the ink film 22, and the ink film 22 is wound tightly without loosening. In addition, the auxiliary belt 5
The tension of 4 is the auxiliary belt 5 for force exceeding a certain torque.
If you allow ink film 4 to slip, ink film 2
2 can be wound up with appropriate tension without loosening.

Effects of the Invention As described above, according to the present invention, in addition to the conventional belt that presses against the outer periphery of the ink film on the winding side to wind the film, an auxiliary belt with an appropriate tension is provided, and the auxiliary belt allows the ink film to be rolled up. Since the support shaft is driven in the film winding direction to wind the film at a faster speed than the belt, it is possible to achieve the following various excellent effects.

(1) The ink film can be wound to a firmness without loosening.

(2) Since the ink film is tightly wound without loosening and does not become thick, the ink film can be unwound and rolled up (2) It is possible to completely wind up one roll without hitting the frame of the film magazine in which it is stored; Moreover, the ink film can be easily removed from the magazine.

(6) When applied to a color transfer printer, each color of the conventional ink film (in this case, the ink film has Y
2M colors and 0 colors of ink are sequentially and continuously applied to a predetermined length), the printing position shift from about 3 mm per color to about I mm, and the screen can print without cueing the color. The number increases.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional ink film winding mechanism.
2 to 6 show an embodiment of the ink film winding mechanism of the printer according to the present invention. The figure is a plan view of the film magazine stored in this printer, Figure 4 is a side view of the same, Figure 5 is an explanatory diagram of the ink film and paper feeding procedure during printing with this printer, and Figure 6 is a side view showing the ink film winding mechanism. It is a diagram. In the figure, 22 is an ink film, 25' and 26' are printers (support shafts), 29 is a winding core, 53 is a belt, and 54 is an auxiliary belt. Patent applicant Fujitsu Limited

Claims (1)

[Claims] In a printer that connects and winds a used ink film to a core attached to a support shaft, and winds the ink film with a belt that runs in pressure contact with the ink film,
An auxiliary belt is provided that is wound around the support shaft and rotates the support shaft in a used ink film winding direction, and the ink film winding speed by the auxiliary belt is set to be higher than the winding speed by the belt. An ink film winding mechanism for a printer, characterized in that the auxiliary belt is set so that the auxiliary belt slips when the tension of the auxiliary belt exceeds a certain level.