KR920004185Y1 - Ribbon feed device - Google Patents

Abstract

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Description

Ribbon feeder

1 is a side view of the winding-up side when the ribbon is in the lowered position, showing a conventional example.

Fig. 2 is a side view of the winding side when the ribbon of Fig. 1 is in the raised position.

Figure 3 is a plan view of the whole showing an embodiment of the present invention.

4 is a side view of the winding side when the ribbon of FIG. 3 is in the lowered position.

Fig. 5 is a side view of the winding side when the ribbon of Fig. 3 is in the raised position.

* Explanation of symbols for main parts of the drawings

21: platen (platen) 23: carrier

24: ribbon (ribbon) 31: ribbon frame

39: latch 41: engaging body

42: press body 45: ribbon winding mechanism

The present invention relates to a ribbon conveying apparatus used for a printer.

One example of this kind of conventional apparatus is shown in FIG. 1 and FIG.

Referring to FIGS. 1 and 2, the pressure plate 2 is freely rotated about an axis. The printing hammer 3 is arranged to be able to impact through the daisy wheel 1 with respect to the pressure plate 2 by rotating about the support shaft 4.

Moreover, the daisy wheel 1, the printing hammer 3, and these driving parts are mounted on a carrier (not shown) which moves along the axial direction of the pressure plate 2.

The ribbon frame 6 for holding the ribbon 5 along the pressing plate 2 is also freely installed around the support shaft 7 on the carrier.

Here, since the support shaft 7 is arrange | positioned in the position far from the pressure plate 2, the ribbon frame 6 performs a lifting operation in the part near the pressure plate 2. As shown in FIG.

The ribbon frame 6 is attached to the ribbon frame 6 so that the ribbon winding shaft 8 and the latch 9 which sequentially wind the ribbon 5 rotate integrally. In addition, a reversal preventing click 10 is also provided on the ribbon frame 6 that is caught by the latch 9 and prevents rotation of the latch 9 in the reverse direction (clockwise in FIGS. 1 and 2). It is.

Moreover, the engaging body 12 which has the elastic part 11 latched | hung elasticly on the latch 9 is provided, and this engaging body 12 is being fixed to the carrier side.

In addition, the roller 13 is rotatably supported on one side of the ribbon frame 6 at a position away from the support shaft 7.

And the home cam 14 and its drive part (not shown) which move up and down the roller 13 by rotating motion are mounted in the carrier side.

In addition, a paper guide 15 is placed on the front surface of the pressure plate 2 and fixed to the carrier to prevent the recording paper (not shown) wound on the pressure plate 2 from overlapping with the ribbon 5.

The pair of guides 15 are provided with openings 16 at positions where the printing hammers 3 face each other.

On the side of the ribbon frame 6 on the side opposite to the side where the ribbon winding shaft 8 and the like are provided, a rotating free ribbon supply side (not shown) for supporting the ribbon 5 wound in a roll shape, and this ribbon Braking means (not shown) are provided to apply a braking force to the supply shaft.

In this structure, the element is performed by rotating the printing hammer 3 by tapping the character of the daisy wheel 1 on the pressing plate 2 when the ribbon 5 is a straight ribbon, and the ribbon 5 of the printing ribbon. In this case, the operation is the same and the argument is performed instead of the element.

That is, the ribbon frame 6 is rotated upward from the position shown in FIG. 1 to the position shown in FIG. 2 prior to the operation of the element or printing. This upward rotation operation is performed by rotating the home cam 14 and raising the roller 13.

When the ribbon frame 6 is rotated upward, the latch 9 is caught by the engaging body 12, so that the latch 9 rotates counterclockwise as the ribbon frame 6 is rotated.

As a result, the ribbon 5 is wound by the ribbon winding shaft 8.

Then, an element or printing is performed by driving the printing hammer 3 in the upward rotation position of the ribbon frame 6.

Here, the reason why the ribbon 5 is wound at the time of upward rotation of the ribbon frame 6 is that the ribbon 5 is preferably wound immediately before the element or printing.

If the structure in which the ribbon 5 is wound when the ribbon frame 6 is rotated downward, a considerable time may elapse until the element or printing is performed after the ribbon 5 is wound.

For this reason, the ribbon 5 will be in the state exposed to the exterior, and the problem that the ribbon 5 will become dirty will arise. On the other hand, if the ribbon 5 is wound up when the ribbon frame 6 is rotated upward, a new portion of the ribbon 5 which has not yet been exposed to the outside immediately before the element or printing is positioned at the impact position.

Thus a clean portion of the ribbon 5 will always be provided for the element or printing.

However, even in this case, when the printing hammer 3 is operated, a part of the ribbon 5 protrudes from the opening 16 of the paper guide 15 in the direction of the pressing plate 2, and the ribbon 5 as much as the protruding portion thereof. ) Is pulled out from the ribbon supply shaft side.

For this reason, in the pulling-out path of the ribbon 5 from the ribbon supply part side to the ribbon winding part side, relaxation occurs in the support state of the ribbon 5 which should be in tension.

Therefore, when the ribbon frame 6 is lowered in such a state, a part of the ribbon 5 is caught by the paper guide 15 or the like in the process.

The present invention has been made in view of such a point, and an object of the present invention is to obtain a ribbon conveying apparatus that can prevent the ribbon from being caught by another structure during the process of lowering the ribbon in a rising position.

The ribbon conveying apparatus according to the present invention is freely installed on the carrier 23 reciprocating in the axial direction of the pressing plate 21 in a vertical direction and a ribbon frame 31 for supporting a long ribbon along the pressing plate 21. And a ribbon winding mechanism provided in the ribbon frame 31, wherein the ribbon winding mechanism winds up the ribbon when the ribbon frame 31 is rotated upward, and the carrier frame is the ribbon frame. And a pressing body 42 which bends the path of the ribbon when the 31 is rotated downward, on the ribbon takeout path.

Therefore, even if a part of the ribbon is relaxed by the printing operation or the element operation at the upper rotational position of the ribbon frame, the pressing member bends the path of the ribbon at the downward rotation of the ribbon frame to give tension to the ribbon to remove the ribbon. .

For this reason, the problem that the loose ribbon catches on another structure at the time of the downward rotation of a ribbon frame is solved.

An embodiment of the present invention will be described with reference to FIGS. 3 to 5.

3 schematically shows the overall structure of the present embodiment.

The pressure plate 21 on which the recording paper 20 is wound is provided freely for rotation.

Two guide shafts 22 are provided along the axial direction of the pressure plate 21, and carriers 23 are provided on the guide shafts 22 in a slippery manner.

Each of the carriers 23 is provided with a ribbon transfer mechanism for printing ribbon (not shown), and a ribbon transfer mechanism 25 for the correct ribbon 24 is provided.

This straight ribbon 24 is a ribbon for an element whose one side is an adhesive face.

Generally, in performing the element by such a straight ribbon 24, the same character is impacted on the already printed letter, and the ink of the already printed letter is adsorbed by the adhesive surface.

The carrier 23 is provided with a daisy wheel 26 and a drive unit (not shown) for driving the daisy wheel 26, and one character of the daisy wheel 26 is placed at a predetermined printing position P. In addition, the printing hammer (27) for selectively impacting the pressure plate (21) is provided. Here, the printing hammer 27 is freely installed on the carrier 23 about the hammer shaft 27a, and the driving force is given by the solenoid 28 provided on the carrier 23.

Further, a paper guide 29 is fixed to the carrier 23 at a position facing the pressing plate 21 with a slight gap therebetween with the recording paper 20 therebetween.

The paper guide 29 is provided with an opening 29a at a printing position P which is an impact position of the daisy wheel 26 with respect to the pressure plate 21.

Next, the ribbon transfer mechanism 25 will be described.

The support shaft 30 is fixed to the carrier 23 by axially matching the pressure plate 21 to an end portion far from the pressure plate 21.

The support shaft 30 is freely rotatably provided with a ribbon frame 31 having a central portion extending to the vicinity of the pressing plate 21 and being bent.

The ribbon frame 31 is provided with a ribbon supply body 43 for winding the retaining ribbon 24 on one side thereof and freely detachable, and a ribbon winding for winding the ribbon 24 on the other side. The shafts 33 are provided freely for rotation, respectively.

And a guide plate for supporting the straight ribbon 24 along the pressing plate 21 adjacent to the ribbon takeout path A between the ribbon supply shaft 32 and the ribbon winding shaft 33. 34 is formed integrally with the ribbon frame 31. Moreover, the ribbon guide 35 which twists the said contact ribbon 24 and optimizes the direction on the ribbon lead-out path A is also integrally formed in the said ribbon frame 31. As shown in FIG. A coil spring 44 is provided between the ribbon arch 43 and the side wall of the ribbon frame 31 to resist free rotation of the ribbon winding shaft 33.

In addition, the roller frame 31 is freely provided with a roller 36 at a position away from the center of rotation around the support shaft 30.

And the groove | channel cam 37 which moves this roller 36 up and down as a driven joint is provided in the said carrier 23 side.

In addition, the carrier 23 is also provided with a drive unit 38 which gives a driving force to the home cam 37.

Here, at the highest rising point of the roller 36 in one cycle of the home cam 37, that is, the uppermost rotational point of the ribbon frame 31, the straight ribbon 24 is connected to the printing position P. Each part is configured to be located at the same height.

4 shows the case where the ribbon frame 31 is in the lowest rotational position, and FIG. 5 shows the case where the ribbon frame 31 is in the uppermost rotational position.

In addition, a latch 39 is fixed to the ribbon winding shaft 33 coaxially.

In addition, one end of the ribbon frame 31 is freely provided with a reverse rotation prevention clock 40, and when the other end of the reverse prevention click 40 is rotated in either direction, the latch 39 is caught. This latch 39 is configured to rotate only in the opposite direction. The direction in which the latch 39 rotates is the winding direction of the straight ribbon 24 by the ribbon winding shaft 33.

Moreover, the engaging body 41 provided with the elastic part 41a which catches elastically on the said latch 39 is provided in the said carrier 23 fixedly.

However, only when the ribbon frame 31 is in a downwardly rotated position that the elastic portion 41a of the engaging body 41 is caught by the latch 39, and the ribbon frame 31 is downward from above. At the time of rotation, the elastic portion 41a is configured to deform by its elasticity to slide the outer circumference of the latch 41.

Thus, the winding mechanism 45 which winds the correct ribbon 24 in accordance with the upward rotation of the ribbon frame 31 as the ribbon winding shaft 33, the latch 39, and the engaging body 41. Is composed.

Further, the engaging body 41 is integrally formed with a pressing body 42 which abuts the straight ribbon 24 in the ribbon lead-out path A to bend the path of the straight ribbon 24. . The specific position of this press body 42 is a position which abuts on the said ribbon ribbon 24 in the part between the said ribbon winding shaft 33 and the said ribbon guide 35, and the said ribbon frame 31 descend | falls. As it is, the bending angle of the path of the correct ribbon 24 is increased.

In such a configuration, the ribbon frame 31 is rotated around the support shaft 30 to move the element from the lowermost rotational position shown in FIG. 4 to the uppermost rotational position shown in FIG.

This upward rotation operation is performed by applying the driving force by the drive unit 38 to rotate the home cam 37 to raise the roller 36 as the driven joint.

Here, the latch 39 is rotated in accordance with the rotation of the ribbon frame 31 because the latch 39 is caught by the elastic portion 41a of the engaging body 41 when the ribbon frame 31 is rotated upward.

As a result, the ribbon winding shaft 33 rotates against the frictional resistance of the coil spring 44, and the straight ribbon 24 is wound.

Then, at the uppermost rotational position of the ribbon frame 31, the printing hammer 27 is driven by the solenoid 28, and a specific character of the daisy wheel 26 impacts the pressure plate 21 through the correct ribbon 24. The element is thereby achieved. After the end of the device, the ribbon frame 31 is quickly returned to the lowest pivot position.

On the other hand, the moment the character of the daisy wheel 26 impacts the pressure plate 21, the right side of the ribbon 24 is outside the normal ribbon take-out path (A), the pressure plate in the opening 29a of the paper guide 29 Protrude in the direction of (21).

Then, the straight ribbon 24 is pulled out from the ribbon supply shaft 32 as much as its protruding portion, and relaxation occurs in the supporting state of the straight ribbon 24, which should be in tension in the ribbon pull-out path A. FIG. However, this loosening of the straight ribbon 24 is removed by the pressing body 42 in accordance with the downward rotation of the ribbon frame 31.

This is because the bending angle of the straight ribbon 24 by the pressing body 42 is set so as to gradually increase in the process of rotating the ribbon frame 31 from the upper side to the lower side.

It is a matter of course that the change is not caused in the straight length from the guide plate 34 to the ribbon winding shaft 33 while the ribbon frame 31 is rotated downward. Therefore, the tension is applied to the correct ribbon 24, and the defects generated when the ribbon frame 31 is rotated downward while the correct ribbon 24 is relaxed are also eliminated.

An example of such a defect is that a part of the straight ribbon 24 is caught by the paper guide 29 or the like.

Also, at the moment of impact caused by the character of the daisy wheel 26 or when the pressing member 42 bends the ribbon take-out path A in accordance with the downward rotation operation of the ribbon frame 31, the straight ribbon ( When 24 is drawn out from the ribbon supply shaft 32, the ribbon supply shaft 32 is subjected to frictional resistance by the coil spring 44 in its rotational direction, so that the ribbon supply shaft 32 is subjected to the inertia force during rotation. It is not rotated by unlimited.

For this reason, especially when the press ribbon 42 bends the ribbon lead-out path A, when the straight ribbon 24 is pulled out from the ribbon supply shaft 32, the straight ribbon 24 does not loosen, and the ribbon does not loosen. Constant tension is maintained in the drawing path (A).

According to this embodiment, since the press body 42 is provided only at the position where the ribbon ribbon 24 in the ribbon take-out path A bends when the ribbon frame 31 is rotated downward, the structure is not complicated. Do not.

In the present embodiment, the ribbon transfer device for the element using the straight ribbon 24 has been described. However, the ribbon transfer device for the printing mechanism using the ribbon for printing as the ribbon is not impeded. When the ribbon frame 31 is rotated at the top, the ribbon 24 does not come into contact with the pressing body 42, or the pressing body 42 does not bend the ribbon 24 even when the ribbon 24 is in contact. Also good.

The present invention provides a ribbon winding mechanism for winding a ribbon in accordance with its upward rotational motion in a ribbon frame which is installed freely in a carrier up and down direction to support a long ribbon along the pressing plate, and a ribbon path according to the downward rotational motion of the ribbon frame. Since the press body for bending the cross section is installed in the carrier, even if the ribbon is loosened in the ribbon take-out path when the element or the printing is performed at the upper rotation position of the ribbon frame, the press body may By bending, tension is applied to the ribbon, so that the loosening of the ribbon can be eliminated to reliably prevent stiffness of the ribbon from surrounding structures.

Claims (5)

A ribbon frame 31 freely installed on the carrier 23 reciprocating in the axial direction of the pressure plate 21 and supporting the long ribbon along the pressure plate 21, and the ribbon frame 31. In the ribbon conveying apparatus comprising a ribbon winding mechanism provided in the ribbon feeding mechanism, the ribbon winding mechanism winds up the ribbon when the ribbon frame 31 is rotated upward, and the carrier 23 has the ribbon frame 31 A pressing body 42 which bends the path of the ribbon in the downward rotation operation is included on the takeout path of the ribbon, and the ribbon winding mechanism of the ribbon frame is moved up and down according to the rotation operation of the ribbon frame 31. A ribbon winding shaft 33 provided with a rotational freedom path on the ribbon winding side, a latch 39 fixedly mounted to the ribbon winding shaft 33 and integrally rotating with the ribbon winding shaft 33, and the carrier (23) Being installed A ribbon conveying apparatus, comprising: an engaging body 41 which rotates the latch in the ribbon winding direction by a ribbon winding shaft by upwardly moving the ribbon frame by elastically engaging the latch 39. . 2. The ribbon conveying apparatus of claim 1, wherein a reversal preventing clock is provided in the ribbon frame to prevent rotation of the latch in a reverse direction. The ribbon conveying apparatus according to claim 1, wherein the pressing member is disposed between the impact position and the take-up shaft in the drawing path of the ribbon. The ribbon conveying apparatus of claim 1, wherein the ribbon is a straight ribbon. The ribbon conveying apparatus according to claim 1, wherein the pressing member and the engaging body are integrally provided.