JPH0986732A - Paper roll holding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper roll holding mechanism, in which even the roll paper is elongated due to various conditions such as temperature, humidity and so on, the paper roll can be arranged surely and stably. SOLUTION: A paper stand 19 for supporting rotary members 26, 27 is adapted to slide in the cross direction of a roll paper 7, and further an elastic member 25 for applying the energizing force to the paper roll 9 from the cross direction of the roll paper 7 is disposed on the paper stand 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper roll holding mechanism, and more particularly to a paper roll holding mechanism capable of reliably and stably holding a paper roll even when the roll paper is stretched.

[0002]

2. Description of the Related Art A conventional paper roll holding mechanism will be described with reference to FIGS.

FIG. 6 shows a conventional paper roll holding mechanism arranged in an ink jet printer. A base portion 1 having a length substantially equal to the width of the printer body is provided at a position behind the inkjet printer, and a bottom plate 2 and a side plate are provided on the upper surface near both widthwise end portions of the base portion 1. The support plate 4 having a substantially L-shaped cross section is composed of screws 5
The bottom plate 2 is fixed to the side plates 3 of the two support plates 4 by a pair of rotating rollers 6 that support a holder 10 of a paper roll 9 described later and rotate according to the rotation of the paper roll 9. It is supported. The support plate 4 and the rotating roller 6 constitute a conventional paper roll holding mechanism.

On the other hand, the roll paper 7 as recording paper is a paper tube 8
The paper tube 8 is fitted around the roll shaft 9a of the paper roll 9, and the holder 1
It is held by 0. The holder 10 is formed in a cylindrical shape projecting in the longitudinal direction of the paper roll 9, and the diameter of the cylindrical portion is larger than the distance between the rotary rollers 6 so that it can be reliably supported by the pair of rotary rollers 6. Has also been made larger.

In such a conventional paper roll holding mechanism, the two support plates 4 are designed so that the space between the side plates 3 is about 1 mm to 3 mm with respect to the length of the holder 10 attached to the paper roll 9. Are arranged so that the distance is equal to. Therefore, the paper roll 9 is not supported by the support plate 4
If it is placed in between, slight backlash will occur,
Since the rotational load when the roll paper 7 is conveyed is reduced, the roll paper 7 is smoothly supplied during recording.

FIG. 7 shows an example in which the paper roll 9 can be set according to the roll papers 7 having different paper widths. The paper roll 9 has a roll shaft 9a having a length equal to the distance between the two support plates 4, and a paper reference holder 11 for fixing the roll paper 7 is provided on the roll shaft 9a. And the fixed holder 12 are fitted together. Of these, the paper reference holder 11 is used as a reference for determining the position of the roll paper 7, and the roll shaft 9a.
It is fixed to. On the other hand, the fixed holder 12 is slidable along the roll shaft 9a according to the width of the roll paper 7, and is fixed to the paper tube 8 of the roll paper 7 from the opposite surface of the paper reference holder 11. The roll paper 7 is fixed so as to bite into it, and the movement of the paper in the width direction is regulated. Then, such a paper roll 9 is supported by the rotary roller 6 between the two support plates 4 which is the paper roll holding mechanism.

[0007]

However, in the conventional paper roll holding mechanism, inconvenience may occur when the roll paper 7 is expanded due to environmental changes. That is, the roll paper 7 used in the recording apparatus is stretched by about 1% in the width direction depending on environmental conditions such as temperature and humidity. For example, in the case of A1 paper, it will be expanded by about 6 mm, and in the larger 36 inch paper it will be about 10 mm.
It also causes the growth.

Therefore, in the conventional paper roll holding mechanism, there is almost no degree of freedom in the paper width direction, so that the roll paper 7 cannot be set in some cases. If the distance between the side plates 3 of the support plate 4 is expanded in the conventional paper roll holding mechanism in consideration of the expansion of the roll paper 7, the holder 1 is rotated by its own weight and rotation.
0 comes out, the roll paper 7 cannot rotate smoothly, or the roll paper 7 moves in the width direction, and the reference position for starting the recording shifts, causing problems such as the recording protruding. I will end up. Further, when the roll paper 7 is fixed to the roll shaft 9a by the interference fit by the fixing holder 12 as shown in FIG. 7, the roll paper 7 cannot be removed due to excessive tightening when the roll paper 7 is stretched. There was also.

The present invention has been made in view of the above problems, and even if the roll paper expands due to various conditions such as temperature and humidity, the paper roll can be reliably and stably arranged. An object of the present invention is to provide a roll holding mechanism.

[0010]

In order to achieve the above object, a paper roll holding mechanism according to a first aspect of the present invention allows a paper stand supporting a rotating member to slide in the width direction of the roll paper. The paper stand is characterized by being provided with an elastic member for applying an urging force to the paper roll in the width direction of the roll paper.
Even if the roll paper extends in the width direction, the paper stand slides in correspondence with the expansion, and the elastic member holds the paper roll stably by the urging force.

Further, the paper roll holding mechanism according to a second aspect of the invention is characterized in that the paper stand is provided with a pair of rotating members which rotate along the paper roll by the urging force of the elastic member. The urging force of the elastic member is weakened to an appropriate magnitude and transmitted to the paper roll.

The paper roll holding mechanism according to a third aspect of the present invention is characterized in that the position of the paper stand can be changed according to the paper size of the roll paper.
As a result, roll papers of various sizes can be held.

A paper roll holding mechanism according to a fourth aspect of the present invention is characterized in that the elastic member is a spring member, which allows the paper roll to be held with a desired biasing force.

Further, in the paper roll holding mechanism according to a fifth aspect of the present invention, one of the holders attached to both ends of the paper roll has a groove formed therein, and the holder is fitted in the groove of the holder. A groove receiving member is provided and the other holder side of the paper roll is held by a paper stand, whereby the groove portion of the holder regulates the movement of the paper roll in the roll axial direction. Then
The recording surface of the roll paper is maintained at a predetermined position.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram showing an ink jet printer equipped with a paper roll holding mechanism of the present invention.

The same components as those of the conventional paper roll holding mechanism are designated by the same reference numerals.

The printer main body of this ink jet printer is provided with a platen 13 for winding and rotating the roll paper 7 at the time of recording to convey the roll paper 7 to a desired recording position. A slide shaft 14 extends in parallel with the platen 13, and a carriage 15 is slidably arranged on the slide shaft 14 along the platen 13. A recording head 16 is mounted on the carriage 15 at a position facing the platen 13, and the recording head 16 is mounted on the platen 13.
Ink is ejected onto the roll paper 7 conveyed by the recording. In addition, the roll paper 7 described above
Is wound around the outer circumference of the paper tube 8. The paper tube 8 is fitted to the roll shaft 9a of the paper roll 9, and both ends of the roll paper 7 are fixed by the holders 10 of the paper roll 9. It is held in a state.

The paper roll holding mechanism is arranged on the rear portion of the printer body, that is, on the back side of the platen 13. On the upper surface of the base portion 1 of the printer main body at this position, a bracket 17 for fixing a paper stand 19 described later is arranged so as to extend in the width direction of the printer main body.
In order to change the arrangement position of the paper stand 19 according to the width of roll paper such as A1 and A2, a plurality of papers are arranged in the width direction of the printer body, that is, in the paper width direction of the roll paper 7 to be arranged. A fitting hole 18 is formed. On the upper surface of the bracket 17, a paper stand 19 for receiving the holder 10 of the paper roll 9 is arranged as shown in FIGS. 2 and 3. The paper stand 19 includes a substantially L-shaped upper stand 20 and a lower stand 21, each of which is composed of horizontal plates 20a and 21a and vertical plates 20b and 21b. The upper stand 20 and the lower stand 21 are They are overlapped and connected by four connecting shafts 22. Then, on the lower surface of the horizontal plate 21a of the lower stand 21, fitting portions 23 for fitting into the fitting holes 18 of the bracket 17 are formed one pair at a time in the width direction of the printer body. . Therefore, by inserting the fitting portion into the fitting hole 18 of the bracket 17, the paper stand 19 is adjusted according to the size of the roll paper 7.
Can be arranged at a desired position. A detection unit (not shown) is provided inside the printer body for detecting a change in the position of the paper stand 19 and transmitting the change to a control unit (not shown).

Further, four slide holes 24 elongated in the width direction of the roll paper 7 are formed in the horizontal plate 20a of the upper stand 20 so as to penetrate the four connecting shafts 22, respectively. 20 can be slid with respect to the lower stand 21 in the paper width direction.

That is, since the upper stand 20 is restricted by the connecting shaft 22 to move in the direction perpendicular to the width direction of the roll paper 7 and in the vertical direction, it can move only in the width direction. When 7 is expanded due to temperature or the like, it can slide in correspondence with the expansion.

Also, the vertical plate 20 of the upper stand 20.
In b, a rotary roller 27 that extends in a direction parallel to the axis of the roll paper 7 and is rotatably disposed so as to be supported by a rotary shaft that projects from the vertical plate 20b is provided. The holder 10 attached to one end of the paper roll is supported and is arranged to rotate in the same direction as the paper roll 9 rotates.

Further, the vertical plate 2 of the upper stand 20.
0b is provided with a pair of horizontally arranged support shafts protruding in the direction of the vertical plate 21b of the lower stand 21 in parallel, and the tip ends of the respective support shafts are perpendicular to the lower stand 21. It penetrates through an opening (not shown) formed in the plate 21b. A coil spring 25 for urging the vertical plate 20b of the upper stand 20 to the left in FIG. 2 is wound around the outer periphery of each spindle.

A pair of biasing rollers 26, which are rotating members, are provided above both ends of the vertical plate 20b of the upper stand 20.
The roll paper 7 is rotatably arranged so as to be supported by a rotary shaft extending in a direction perpendicular to the axis of the roll paper 7 and projecting from a vertical plate 20b of the upper stand 20. These biasing rollers 26 come into contact with the end surface of the holder 10 when the paper roll 9 is held, and the coil spring 25.
The urging force of the paper is transmitted to the paper roll 9. At this time, the biasing roller 26 causes the coil spring 2 to rotate as the paper roll 9 rotates due to the biasing force of the coil spring 25 and the frictional force with the end surface of the holder 10.
5 is rotated in the urging direction. For this reason,
The biasing force of the coil spring 25 is not directly transmitted to the paper roller 9, but is weakened and transmitted. Therefore, the paper roll 9
Therefore, it is possible to apply an appropriate rotation load without hindering the rotation.

Here, as a result of an experiment, it was found that about 500 gf is suitable for the value of the biasing force of the coil spring 25 when the size of the roll paper 7 is up to 36 inches. Further, when the gripping force between the platen 13 and the roll paper 7 is strong, the value of this urging force can be changed within the range up to 3000 gf. The reason why the allowable range of the biasing force of the coil spring 25 can be set in a wide range is that the biasing force of the coil spring 25 is weakened by the biasing roller 26 rotatable in the biasing direction as described above. This is because it is configured to be transmitted to the paper roll 9. Thereby, the upper stand 2 supporting the paper roll 9
The sliding range of 0 can be set in a wide range.

Further, by interposing a member such as a bearing having a small rotational load between the biasing roller 26 and the rotary shaft, the biasing force of the coil spring 25 can be further selected in a wide range.

On the other hand, on the upper surface of the base portion 1 opposite to the position where the paper stand 19 is arranged,
A support plate 4 for supporting the holder 10 at the other end of the paper roll 9 is formed in a substantially L-shaped cross section composed of a bottom plate 2 and a side plate 3 and is fixed by screws 5. On the side plate 3 of the support plate 4, a pair of rotary rollers 27 having a rotary shaft in the width direction of the roll paper 7 are rotatably arranged.

Next, the operation of the embodiment of the above-described paper roll holding mechanism of the present invention will be described.

First, the size of the roll paper 7, for example, A
When recording on roll papers 7 having different paper widths such as 1 and A2, the arrangement position of the paper stand 19 is changed according to the size of the roll paper 7. That is, the bracket 1
Desired fitting hole 18 among the plurality of fitting holes formed in 7
The fitting portion 23 of the lower stand 21 is fitted and fixed. Then, the holders 10 at both ends of the paper roll 9 are supported by the rotary roller 27 of the support plate 4 and the rotary roller 27 of the paper stand 19, respectively. At this time, if the roll paper 7 is stretched under the influence of the temperature and humidity of the storage location, the upper stand 20 is slid against the biasing force of the coil spring 25. Then, when the paper roll 9 is held by the paper roll holding mechanism, the coil spring 25 disposed on the upper stand 20 passes through the pair of urging rollers 26 to fix one end portion of the paper roller. The holder 10 is biased in the width direction of the paper. Since each biasing roller 26 rolls along the holder 10 against the biasing force of the coil spring 25, the biasing force of the coil spring 25 is weakened.
It will be transmitted to 0.

Thereafter, when the platen 13 starts to rotate when recording with the ink jet printer,
The gripping force also rotates the paper roll 9, and the rotating roller 27 and the urging roller 26 also rotate.
Therefore, the roll paper 7 is wound around the platen 13 and conveyed to a predetermined recording surface by frictional force.

According to the embodiment of the paper roll holding mechanism of the present invention as described above, even if the roll paper 7 is left under high temperature and high humidity and is stretched in the width direction, the paper stand 19 is provided. Since the upper stand 20 slides in the paper width direction, that is, in the direction in which the space for holding the paper roll 9 with respect to the lower stand 21 increases, the paper roll 9 can be set easily and stably.

Next, another embodiment of the paper roll holding mechanism of the present invention will be described with reference to FIGS.

It should be noted that the same components as those of the above-described embodiment will not be described again and the same reference numerals will be given.

In the present embodiment, the holder 10 of the paper roll 9 supported by the support plate 4 fixed to the printer main body has a groove 28 as shown in FIG. Is. On the other hand, the side plate of the support plate 4 on which the holder 10 is supported is provided with a substantially semicircular groove receiving portion 29.
Are formed. Then, the groove portion 28 of the holder 10
When the sheet roll 9 is fitted into the substantially semicircular groove receiving portion 29, the movement of the paper roll 9 to the right in FIG. 4 is restricted, so that the lower limit of the biasing force of the coil spring 25 is made smaller. can do. For example, when the paper roll 9 is set at an angle by mistake, a force is generated to move the paper roll 9 in the direction against the coil spring 25. This force is the biasing force of the coil spring 25. Even if it is larger than the above, since the movement of the paper roll 9 is restricted, the recording surface will not be displaced. Also,
By fitting the groove portion 28 of the holder 10 into the groove receiving portion 29, the axial direction of the holder 10 can be accurately matched with the axial direction of the rotating roller 27.

Therefore, as described above, according to another embodiment of the present invention, the groove 28 of the holder 10 is inserted into the support plate 4.
Since the paper roll 9 can be securely held only by being fitted in the groove receiving portion 29 of the side plate, the value of the biasing force of the coil spring 25 can be set in a wider range.

The present invention is not limited to the above-mentioned embodiment, but can be modified as necessary.

For example, the paper stand 19 is detached each time the placement position is changed according to the paper size of the roll paper 7, and the fitting part 23 of the lower stand 21 is fitted into a predetermined fitting hole 18. The bracket 17 may be provided with a rail, and the paper stand 19 may slide along the rail to a position of a desired paper size.

Further, in the description of the above-described embodiment, the paper roll holding mechanism is mounted on the ink jet printer, but the invention is not limited to this case and the paper roll holding mechanism is mounted on the printer of another system. Even if it does, the same effect is exhibited.

[0039]

As described above, the paper roll holding mechanism according to the present invention can easily and easily even if the roll paper is deformed, especially when it is stretched in the width direction when stored under high temperature and high humidity. It is possible to reliably hold the paper roll.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which an ink jet printer is mounted as an embodiment of a paper roll holding mechanism according to the present invention.

FIG. 2 is a side view showing a main part of a paper roll holding mechanism according to the present invention.

FIG. 3 is a plan view of FIG.

FIG. 4 is an explanatory view showing another embodiment of the paper roll holding mechanism according to the present invention.

FIG. 5 is a partial cross-sectional view showing a holder in another embodiment of the paper roll holding mechanism according to the present invention.

FIG. 6 is a view showing a conventional paper roll holding mechanism.

FIG. 7 is a diagram showing a conventional paper roll holding mechanism.

[Explanation of symbols]

 1 Base Part 4 Support Plate 7 Roll Paper 9 Paper Roll 10 Holder 13 Platen 16 Recording Head 17 Bracket 18 Fitting Hole 19 Paper Stand 20 Upper Stand 21 Lower Stand 22 Connecting Shaft 24 Slide Hole 25 Coil Spring 26 Biasing Roller 27 Rotating Roller 28 Groove portion 29 Groove receiving portion

Claims (5)

[Claims] 1. A paper roll holding mechanism for rotatably holding a paper roll wound with roll paper by a rotary member rotatable in the same direction as the paper roll at the time of paper feeding, while supporting the rotary member. It has a paper stand slidable in the width direction of the roll paper, and an elastic member arranged on the paper stand for applying a biasing force to the paper roll in the width direction of the roll paper. Paper roll holding mechanism. 2. A pair of rotatably supported by the paper stand for transmitting the urging force of the elastic member to the paper roll and rotatable along the paper roll by the urging force of the elastic member. The sheet roll holding mechanism according to claim 1, further comprising a rotating member. 3. The paper roll holding mechanism according to claim 1, wherein the arrangement position of the paper stand can be changed according to the paper size of the roll paper. 4. The paper roll holding mechanism according to claim 1, wherein the elastic member is a spring member. 5. A holder having a groove is attached to one end of the paper roll, and a groove receiving member is provided which is fitted into the groove of the holder to regulate movement of the paper roll in the roll axial direction. At the same time, the other end of the paper roll is held by the paper stand, and the paper roll holding mechanism according to any one of claims 1 to 4.