JPH09207404A - Paper feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly, stably transfer a continuous form without requiring a high precision in transfer of the continuous form and prevent a paper jam by incorporating a back tension mechanism into a paper feeder to exert a back tension on the continuous form corresponding to transfer of the continuous form in a printer. SOLUTION: When the front end of a continuous form is supplied to a printer main body from a paper feeder, a paper driving gear is turned via a supply core 33 and a supply core shaft 32 corresponding the supply of the continuous form (outside wound), causing a spring driving shaft 42 to be turned via a torque limiter 39 and a tension gear 40. As a result, a tension spring 44 stretches and a tensile force corresponding to the elongation of the tension spring 44 works on the tension gear 40, and the tensile force inversely acts on the continuous from as a back tension via the paper driving gear, the supply core shaft 32, the supply core 33 and a paper fastening roller 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device that holds continuous paper and feeds it to a printer.

[0002]

2. Description of the Related Art Conventionally, there has been known a color printer in which a plurality of print heads are arranged in series on a paper conveyance path. FIG. 8 is a diagram showing a schematic main configuration of the color printer. The Y head 1, the M head 2, the C head 3, and the Bk head 4 as print heads are end surface thermal line heads in each of which a plurality of heating resistors are arranged in a line on the end surface of a rectangular parallelepiped having a length of 4 inches. Are sequentially arranged in series on the sheet conveyance path 5 formed as.

These Y heads 1 to Bk heads 4 include
The first platen 6 to the fourth platen 9 are arranged facing each other, and the ribbon magazines 10 to 13 are detachably set. This ribbon magazine 1
0 to 13 include feed side rollers 10-1 to 13-1 on which unused ink ribbons are wound and take-up rollers 10-2 to 13-2 on which used ink ribbons are wound. Is provided.

A yellow ink ribbon, a magenta ink ribbon, a cyan ink ribbon, and a black ink ribbon are set in each of these ribbon magazines 10 to 13, and these ribbon magazines 10 to 13 are set.
Each ink ribbon is supplied to each of the thermal heads 1 to 4 from # 13. A paper feed roller 14 for controlling the paper feed speed and an auxiliary roller 15 provided so as to face the paper feed roller 14 are arranged on the paper feed side of the position where the Y head 1 is arranged on the feed path 5. ing.

On the transport path 5 between the paper transport roller 14 and the Y head 1, there is provided a sensor section including a gap sensor for detecting a gap between labels on a sheet and a marker sensor for detecting a mark printed on the sheet. 16 are arranged. Further, a paper end sensor 17, which is an optical transmission type sensor for detecting the end of the paper, is arranged in the vicinity of the paper supply port 5-1 of the conveyance path 5 on the paper supply side of the paper conveyance roller 14. There is.

A paper holder 18 as a paper supply device is fixed to the outside of the paper supply port 5-1 of the conveying path 5, and a continuous paper 19 as a long print medium is wound around the paper holder 18. Set. The continuous paper 19 is a label paper in which a plurality of labels are attached to a mount at predetermined intervals. In addition, the paper supply port 5 of the transport path 5
A sheet discharge port 5-2 for discharging the printed sheet is formed on the side opposite to -1.

Therefore, the ink ribbons from the ribbon magazines 10 to 13 and the continuous paper 19 from the paper holder 18 are conveyed at a substantially constant speed between the thermal heads 1 to 4 and the platens 6 to 9. That is, in this color printer, desired images are formed in the order of yellow, magenta, cyan, and black.

9A and 9B are views showing a main configuration of a paper holder 18 as a paper feeding device, FIG. 9A is a top view of the paper holder 18, and FIG. 9B is a paper holder. It is the side view seen from the attachment side to the printer of 18. The paper holder 18 includes a supply core arm 21 attached to the printer body, a supply core shaft 22 fixed to the supply core arm 21, and a cylindrical shape rotatably fitted to the supply core shaft 22.
A supply core 23 (preferably having a true cylindrical shape), a supply holder 24-1, which is fitted to the supply core 23 and is arranged so as to sandwich the wound continuous paper 19 which is also fitted to the supply core 23, It is composed of 24-2 and the like.

As shown in FIG. 9B, the supply core arm 21 is formed by a sheet metal and a plurality of shafts that are bent into a U-shape, and has a locking portion 25 formed at its end. The printer is positioned and attached by inserting it into a hole (groove) (not shown) in the printer body.
It is securely fixed by 6. A supply core shaft 22 is fixed to one side of the supply core arm 21 so as to project to one side of the supply core arm 21 on the side opposite to the locking portion 25. In the projecting portion of the supply core shaft 22, the internal cavity of the cylindrical supply core 23 (its diameter is
(Inner diameter) is slightly larger than the diameter of the supply shaft 22. ) Is fitted and fixed. Furthermore, the supply holders 24-1 and 24-2 are oblong and have a fitting hole having a diameter slightly larger than the outer diameter of the supply core 23 formed in the center thereof. It can be fixed with. Therefore, first, according to the width of the continuous paper 19, the supply holder 2 on the back side is
4-1 is the corresponding position of the supply core 23 (width of continuous paper is 1
If it is 00 mm, 50 m from the center of the supply core 23
1) Inserted and fixed at position m), and then wound continuous paper 1
9 (the inner diameter of the paper tube as a tubular member serving as the core of the continuous paper 19 is formed slightly larger than the outer diameter of the supply core) is inserted into the supply core 23, and then the supply holder on the front side is inserted. 24-2 is inserted into the supply core 23,
The supply holder 24-1 is fixed so as to sandwich the continuous paper 19 (at this time, the supply holder 24-2 is fixed at a position of 50 mm from the center of the supply core 23 to the front side).

As described above, in a color printer in which a plurality of print heads are provided in series on the transport path, the transport path for paper becomes long. Therefore, a problem is that when continuous paper 19 is used instead of single-cut paper, the continuous paper 19 is stably and accurately conveyed without skew or meandering. For this reason, in the past, the paper conveying roller 14 as a drive source that mainly conveys continuous paper has a high precision of shape (in the case of a cylindrical driving roller or a platen, the continuous paper 19
The parallelism of the contact area between was required. The platens 6 to 9 are also required to have a high degree of shape accuracy, but the accuracy may be inferior to the paper carrying roller 14 that basically controls the carrying of the continuous paper 19.

Further, the continuous paper 19 is provided by the supply core 23.
Since it is only inserted in, continuous paper 1
9 and the supply core 23 do not rotate integrally. However, when the continuous paper 19 has a large diameter, when the continuous paper 19 rotates due to the weight of the continuous paper 19 in response to the paper conveyance of the paper conveyance rollers 14, the rotational force also acts on the supply core 23 and the supply core 23. May rotate in a suspicious manner. However, when the continuous paper 19 has a small diameter, the rotational force of the continuous paper 19 hardly acts on the supply core 23, so the supply core 23 does not rotate.

[0012]

Conventionally, in a color printer, in order to convey continuous paper, a highly accurate shape accuracy is required for the paper carrying roller 14, and a paper suitable for the highly accurate shape accuracy is required. The transport roller has a problem of high cost. On the other hand, if a paper transporting roller that does not conform to a highly precise shape accuracy is used, the continuous paper 19 will meander or skew in a long transport path, causing a paper jam such as wrinkles on the continuous paper. there were.

When the continuous paper 19 is used in the color printer, the leading end (of the unprinted portion) of the continuous paper 19 has already reached the position of the Bk head 4 when the first printing is completed. Therefore, when printing is started again, the leading edge of the continuous paper 19 must be fed back to the position of the Y head 1 in order to avoid waste of the continuous paper 19. At this time, the fed-back amount of the continuous paper 19 becomes slack between the paper transport roller 14 and the paper holder 18.

The occurrence of the slack adversely affects the conveyance of continuous paper by the paper conveyance roller 14, and
There is a problem that the continuous paper 19 directly leads to a paper jam depending on the paper quality and configuration.

Therefore, according to the present invention, stable and reliable transport of continuous paper can be realized and paper jam can be prevented without requiring high precision in transporting continuous paper in the paper transport mechanism of the printer. An object is to provide a paper feeding device.

[0016]

The invention corresponding to claim 1 is:
A paper feeding device that holds continuous paper and supplies it to a printing device is provided with a back tension mechanism that applies a back tension in accordance with conveyance of continuous paper in the printing device.

According to a second aspect of the present invention, in a paper feeding device that holds continuous paper and supplies it to the printing device, the back tensioning mechanism applies a back tension according to the conveyance of the continuous paper in the printing device, and the continuous paper. The back tension limiting means limits the back tension of the continuous paper by the back tension mechanism so that the back tension does not exceed a preset value. The invention corresponding to claim 3 is claim 1
In the invention according to any one of claims 2 and 3, the back tension applied to the continuous paper by the back tension mechanism gradually increases at the start of conveyance of the continuous paper.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the back tension force applied to the continuous paper by the back tension mechanism during the back feed conveyance of the continuous paper in the printing apparatus. It is used to wind continuous paper.

The invention according to claim 5 is, in the invention according to claim 4, for winding continuous paper for a predetermined length or more.

According to a sixth aspect of the invention, in the invention according to any one of the third to fifth aspects, the back tension mechanism applies the bank tension to the continuous paper so as to gradually increase the bank tension. Tensioning means,
Back tension applied to continuous paper so that the back tension does not exceed the preset tension force.
And a tension force applied to the continuous paper by the first back tension means to be the same as or slightly lower than the tension force applied to the continuous paper by the second back tension means.

According to a seventh aspect of the present invention, in a paper feeding device that holds continuous paper wound around a tubular member and supplies it to a printing device, the continuous paper has a shape that can be inserted into an internal cavity of the tubular member. A holding member for holding the continuous paper,
Provided is a sheet fixing unit that protrudes from the outer shape of the holding member and presses the tubular member inserted into the holding member from the inside to the outside, and that rotates or rotates in the insertion / extraction direction of the tubular member of the continuous paper. It is a thing.

In the invention according to claim 8, in the invention according to claim 7, the sheet fixing means presses the substantially central portion of the continuous sheet in the width direction from the inside to the outside.

According to a ninth aspect of the invention, in the invention according to the seventh aspect and the eighth aspect, the back tension mechanism for applying a back tension in accordance with the conveyance of the continuous paper in the printer and the back tension for the continuous paper are previously set. Back tension limiting means for limiting the back tension of the continuous paper by the back tension mechanism is provided so as not to exceed the set size, and when the continuous feeding of the continuous paper in the printing device is carried by the back feed, the back tension mechanism backs the continuous paper. It takes up continuous paper using the tension force.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The sheet feeding apparatus of this embodiment is a printing apparatus, for example, a sheet feeding apparatus attached to a color printer (see FIG. 8) as described in the related art. However, a sheet feeding apparatus to which the present invention is applied is Alternatively, it may be incorporated as a part of the printing device.

FIG. 1 is a top view including a partial cross-sectional view showing the main structure of this paper supply device, and FIG. 2 is a view showing the main structure of this paper supply device as seen from the mounting side to a color printer. It is a side view. The paper supply device has a supply core arm 31 attached to the printer body, a supply core shaft 32 fixed to the supply core arm 31, and a cylindrical shape (preferably a true cylindrical shape) rotatably fitted to the supply core shaft 32. ) Supply core 33,
It is composed of supply holders 34-1 and 34-2, which are fitted to the supply core 33, and which are arranged so as to sandwich the rolled continuous paper which is also fitted to the supply core 33. These supply holders 34-1 and 34-2 are oblong in shape and have a fitting hole having a diameter slightly larger than the outer diameter of the supply core 33 formed in the center, and a claw for positioning / fixing is formed inside thereof. (Not shown) is formed.

The supply core arm 31 has an outer shape formed by a sheet metal and a plurality of shafts which are bent into a U-shape, and has a locking portion 35 formed at its end as shown in FIG. Holes (grooves) not shown in the printer body
It is positioned and attached by being inserted into and is securely fixed by the screw 36. On the opposite side of the supply core arm 31 from the locking portion 35, a supply core shaft 32 projects toward one side of the supply core arm 31 and is rotatably supported by an oil-impregnated bearing 37.

A sheet drive gear 38 is fixed to a portion of the supply core shaft 32 inside the supply core arm 31 by a screw. A torque limiter 39 is connected to the sheet drive gear 38, and the torque limiter 39 is connected to the torque limiter 39. Is connected to a tension gear 40. The torque limiter 39 and the tension gear 40 are rotatably supported by the shaft forming the supply core arm 31. Further, the torque limiter 39
The spring-driven shaft stop plate 41 is attached to the shaft that rotatably supports
Has been fixed. A spring drive shaft 42 is fixed to a peripheral end portion of the tension gear 40, and a spring fulcrum shaft 43 fixed to the spring drive shaft 42 and the supply core arm 31.
A tension spring 44 is hung between and. The spring drive shaft 42 rotates according to the rotation of the tension gear 40, but comes into contact with the spring drive shaft stop plate 41 at a predetermined position, whereupon the rotation of the tension gear 40 is forcibly stopped. It

As shown in FIG. 4, the torque limiter 39 includes a flanged gear 45, a first friction plate 46, a limit gear 47, a second friction plate 48, a limit spring 49, and It is composed of a spring adjusting nut 50. The flanged gear 45 includes a gear portion, a flange portion, and a screw portion. The first friction plate 46, the limit gear 47, the second friction plate 48, and the limit spring 49 are inserted into the threaded portion of the flanged gear 45, and fixed by the spring adjusting nut 50. . Therefore, the distance between the spring adjusting nut 50 and the flange portion of the flanged gear 45 is determined by the degree to which the spring adjusting nut 50 is tightened, and the limit spring 49 is compressed according to the distance. (Reduced), the repulsive force (stretching force) of the second friction plate 48,
The limit gear 47 and the first friction plate 46 press each other. The sheet drive gear 38 is connected to the limit gear 47, and the tension gear 40 is connected to the gear portion of the flanged gear 45.

At the protruding portion of the supply core shaft 32, an internal cavity of a cylindrical supply core 33 is provided.
(The diameter (inner diameter) is slightly larger than the diameter of the supply shaft 32.) Fit and fix. As this fixing method, although not shown, for example, a projecting pin is provided on the surface of the supply core shaft 32, and a groove into which the projecting pin fits is formed inside the supply core 33, and the projecting pin is formed in the groove. By fitting the supply core 33 to the supply core shaft 32 so as to fit,
The supply core shaft 32 and the supply core 33
And will rotate together. Supply core 3
As shown in FIG. 1, a plurality of flat portions 51 are formed on the surface of No. 3, and the flat portions 51 are provided with a scale indicating the distance from the preset center position of the supply core 33. . Further, as shown in FIG. 2, an engaging portion 52 that engages with a claw formed inside the supply holders 34-1 and 34-2 is formed. Furthermore, as shown in FIG. 1, FIG. 2, FIG. 5 and FIG.
A groove portion 53 is formed on the opposite surface of the flat portion 51 of the sheet feeding roller 33, and a sheet fixing roller 54 is rotatably attached by a fixing roller attachment fitting 55 near one wall surface of the groove portion 53 at the central position of the supply core 33. Has been.

The height of the paper fixing roller 54 at the supply core 33 is larger than the diameter of the supply core 33 and is slightly larger than the inner diameter of the paper tube which is the core of the continuous paper to be set. Note that, in FIG. 1, the sheet fixing roller 54 is shown by a solid line for ease of viewing, but it is actually on the back side and should be originally shown by a broken line. The sheet fixing roller 54 is arranged not on the groove 53 of the supply core 33 but on the surface, and is always urged in the surface direction by a leaf spring or the like. It may be rotatably supported by a mechanism that escapes inward of the core 33.

FIG. 7 is a view showing a stand 61 for pseudo-holding the above-mentioned sheet feeding device, which is a cantilever type. FIG. 7 (a) is a side view thereof, and FIG. 7 (b) is a front view thereof. The stand 61 is
It is composed of a base plate 62, a height adjusting plate 63, and a knob screw 64. The base plate 62 stably stands on a base (not shown) on which the color printer is installed, and a through hole through which the threaded portion of the knob screw 64 is formed is formed substantially at the center thereof. A U-shaped groove 65 is formed in the. On the other hand, a slit (not shown) extending in the vertical direction through which the threaded portion of the knob screw 64 passes is formed in the approximate center of the height adjusting plate 63, and an upper portion of the slit is formed.
A V-shaped groove 66 that engages with a stand groove 56 formed at one end of the supply shaft 32 shown in FIGS. 1 and 2.
Are formed.

In this embodiment having such a structure, the continuous paper is set as follows.
First, according to the width of the continuous paper, the supply holder 34-1 on the back side is moved to the corresponding position by the scale of the supply core 33 (if the width of the continuous paper is 100 mm, the position 50 mm behind the supply core 33). The -1 claw is engaged with the engaging portion 52 and fixed. Next, the continuous paper is inserted into the supply core 33. At this time, the paper core of the continuous paper rides on the paper fixing roller 54 to generate some resistance,
Since the paper fixing roller 54 rotates in response to the insertion of the continuous paper, the continuous paper can be easily inserted. Then, when the end face of the continuous paper on the insertion side comes into contact with the supply holder 34-1 which is already fixed, the continuous paper is fed to the supply core 3
It was set in the center of 3. Therefore, the supply holder 34-2 is fixed to the supply holder 34-1 by sandwiching the continuous paper with its claw engaging the engaging portion 52. At this time, the supply holder 34-2 is positioned at a position of 50 mm just on the front side by the scale of the supply core 33. If the continuous paper is heavy (the diameter of the rolled continuous paper is large), supply core 3
3 is tilted and influences the rotation of the supply core 33, the stand 61 is used to make the suspicious two-sided type. That is, the height of the height adjusting plate 63 of the stand 61 is adjusted by the knob screw 64, and the V-shaped groove 66 of the stand 61 is engaged with the stand groove 56 formed at one end of the supply core shaft 32. The support core 33 is horizontally supported by being combined with and axially supported.

Next, the leading edge of the continuous paper is fed from the paper feeding device to the printer body. At this time, the paper drive gear 38 rotates in the direction of arrow H in FIG. 3 via the supply core 33 and the supply core shaft 32 in accordance with the supply of continuous paper (outer winding), and the rotation of the paper drive gear 38 causes the paper drive gear 38 to rotate. ,
The spring drive shaft 42 rotates in the arrow R direction via the torque limiter 39 and the tension gear 40. Then, the tension spring 44 expands, and a tensile force corresponding to the expansion of the tension spring 44 acts on the tension gear 40, and the tensile force reverses to the torque limiter 39 and the sheet drive gear 3
8, acting as back tension on the continuous paper through the supply core shaft 32, the supply core 33 and the paper fixing roller 54.

In the meantime, the leading edge of the continuous paper is inserted into the paper transport roller of the printer body and is transported to each print head at a preset transport speed. Eventually, the spring drive shaft 42 contacts the spring drive shaft stop plate 41, and the rotation of the tension gear 40 is forcibly stopped. At this moment, the torque limiter 39, the paper drive gear 38, the supply core shaft 32, the supply core 33, the back tension (tensile force) applied to the continuous paper increases, and the torque limiter 39
When the back tension tries to exceed the frictional force between each of the first friction plate 46, the limit gear 47, and the second friction plate 48, the limit gear 47 causes the first friction plate 46 and the second friction plate 46 to move. Of the paper drive gear 38, the supply core shaft 32, the supply core 33,
Further increase in back tension on continuous paper is avoided.

This back tension is maintained as it is while the printer body is transporting continuous paper and while the transport is stopped (held). However, when the continuous paper is back-fed, the force in the transport direction that balances the back tension is lost, so the tension force of the tension spring 44 acts and the spring drive shaft 42 moves to the home position P in the opposite direction this time. Start to rotate. The home position P is located on a line connecting the spring fulcrum shaft 43 and the shaft that supports the tension gear 40. Therefore, the tension gear 40 rotates in the direction of the arrow L, the torque limiter 39, the sheet driving gear 38, the supply core shaft 32, and the supply core 33 are reversed, and the supply core 33 causes the slack continuous sheet rewound by feedback. Wind up. At this time as well, the supply core 33 is adapted to rotate integrally with the continuous paper by the paper fixing roller 54, so that the continuous paper can be wound up without loss. The winding of the continuous paper is completed when the spring drive shaft 42 reaches the home position P.

At this time, if the supply core 33 is inclined without using the stand 61, the spring drive shaft 4
Before 2 reaches the home position P, the tension force (back tension) by the tension spring 44 is balanced with the winding resistance of the continuous paper generated due to the inclination of the supply core 33, and the continuous paper is wound. Will stop.

As described above, according to this embodiment, the paper fixing roller 54 for integrally rotating the supply core 33 and the continuous paper (paper core), and the paper fixing roller 54 fixed to the supply core 33 and the supply core shaft. Paper drive gear 38
A torque limiter 39 connected to the sheet drive gear 38 and preventing the back tension from exceeding a preset value; a tension gear 40 connected to the torque limiter 39; and a tension gear 40 fixed to the tension gear 40. Since the tension spring 44 is provided between the spring drive shaft 42 and the spring fulcrum shaft 43 fixed to the supply core arm 31, the continuous paper can be easily attached to and removed from the supply core 33. In addition, the supply core 33 and the continuous paper can be surely rotated integrally with each other, and at the start of the transportation of the continuous paper, the back tension is gently applied to the continuous paper by the tension force of the tension spring 44 extending in accordance with the transportation. The back tension can be applied and the back tension is set to a preset value (upper limit value) or less than this preset value. When it reaches a very low value, the extension of the back tension spring 44 is prohibited, and the torque limiter 3
9, a predetermined value of back tension can be applied to the continuous paper, and during back feed, the supply core 33 is rotated in the reverse direction by the action of the tension spring 44 to set the continuous paper to a preset amount (depending on the diameter of the continuous paper. It is possible to wind only the amount determined by the above).

Therefore, if the back tension of a predetermined value is optimally set, the continuous paper which has started to be fed is gradually increased in back tension, and thereafter, the back tension of a predetermined value is always applied. Even if the conveyance rollers and the platen do not achieve high-precision shape accuracy, the back tension corrects conveyance troubles such as meandering and skewing during conveyance of continuous paper. As a result, continuous paper can be stably and reliably conveyed.

At the time of feedback, the back tension applied by the tension spring 44 is used to
Since the paper returned by the backfeed (slackened paper) can be wound around the supply core 33, it is possible to prevent the paper jam of the continuous paper at the time of the backfeed and the paper jam at the time of the conveyance after the feedback. Can be prevented.

In this embodiment, the outer-wrapped continuous paper has been described. However, according to the above-mentioned configuration, the inner-rolled continuous paper is similarly processed without any operation such as switching of switches. A back tension that gradually increases at the start of conveyance can be applied, and then a back tension of a predetermined value can be applied.At the time of back feeding, continuous paper is preset by a preset amount (determined according to the diameter of continuous paper. You can rewind it by the amount that is done.
Therefore, the effect described above can be obtained even with the continuous paper wound inside.

In this embodiment, the gear,
Although an example using a spring or the like has been described, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

[0042]

As described in detail above, according to the present invention,
By reliably holding continuous paper and applying back tension, it is possible to achieve stable and reliable continuous paper conveyance without requiring high accuracy for continuous paper conveyance in the paper conveyance mechanism of the printer. It is possible to provide a sheet feeding device capable of preventing jamming.

[Brief description of drawings]

FIG. 1 is a top view including a partial cross-sectional view showing a main part configuration of a sheet supply device according to an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a main part of the sheet feeding device according to the embodiment, as viewed from a mounting side to a color printer.

FIG. 3 is a cross-sectional view showing a configuration of a supply core arm of the paper feeding device according to the embodiment.

FIG. 4 is a perspective view showing a configuration of a torque limiter of a supply core arm of the sheet feeding device according to the embodiment.

5A and 5B are a side view and a front view showing a supply core of the sheet supply apparatus according to the embodiment.

FIG. 6 is a perspective view showing a sheet fixing roller and a fixing roller mounting bracket which are attached to a supply core of the sheet feeding apparatus of the embodiment.

7A and 7B are a side view and a front view showing a stand of the sheet feeding apparatus of the embodiment.

FIG. 8 is a diagram showing a schematic main configuration of a color printer.

9A and 9B are a top view and a side view showing a main configuration of a paper holder in a conventional color printer.

[Explanation of symbols]

 38 ... Paper drive gear, 39 ... Torque limiter, 40 ... Tension gear, 41 ... Spring drive shaft stop plate, 42 ... Spring drive shaft, 43 ... Spring fulcrum shaft, 44 ... Tension spring, 54 ... Paper fixing roller, 55 ... Fixed roller mounting bracket.

Claims (9)

[Claims] 1. A paper supply device for holding continuous paper and supplying it to a printing device, comprising a back tension mechanism for applying a back tension in accordance with conveyance of the continuous paper in the printing device. apparatus. 2. A paper feeding device for holding continuous paper and supplying it to a printing device, comprising: a back tension mechanism for applying a back tension in accordance with conveyance of the continuous paper in the printing device; and a back tension for the continuous paper. A paper feeding device, comprising: a back tension limiting means for limiting the back tension of the continuous paper by the back tension mechanism so as not to exceed a preset size. 3. The paper feeding device according to claim 1, wherein the back tension applied to the continuous paper by the back tension mechanism gradually increases at the start of conveyance of the continuous paper. A paper feeding device characterized by. 4. The paper feeding device according to claim 1, wherein a back tension force applied to the continuous paper by the back tension mechanism is applied when the continuous paper is fed back by the printing device. A paper feeding device, characterized in that the continuous paper is wound up by utilizing the continuous paper. 5. The sheet feeding device according to claim 4,
A sheet feeding device, wherein the continuous sheet is wound up for a predetermined length or more. 6. The paper feeding apparatus according to claim 3, wherein the back tension mechanism applies a back tension mechanism to the continuous paper so as to gradually increase the bank tension. And a second tension is applied to the continuous paper so as not to apply a back tension exceeding a preset tension force.
And a tension force applied to the continuous paper by the first back tension means to be equal to or slightly lower than a tension force applied to the continuous paper by the second back tension means. Characteristic paper feeding device. 7. A paper feeding device for holding a continuous paper wound around a tubular member and supplying the continuous paper to a printing device, the continuous paper having a shape insertable into an internal cavity of the tubular member of the continuous paper. The holding member for holding and the tubular member protruding from the outer shape of the holding member and inserted into the holding member are pressed from the inner side to the outer side, and rotated in the insertion / extraction direction of the tubular member of the continuous paper. Alternatively, a sheet fixing device that rotates is provided. 8. The paper feeding apparatus according to claim 7,
The paper feeding device, wherein the paper fixing means presses a substantially central portion in the width direction of the continuous paper from the inside to the outside. 9. The paper feeding device according to claim 7, wherein a back tension mechanism that applies a back tension according to the conveyance of the continuous paper in the printing device, and a back tension that applies to the continuous paper are set in advance. A back tension limiting means for limiting the back tension of the continuous paper by the back tension mechanism so as not to exceed the specified size, and when the back feeding of the continuous paper in the printing device is carried by the back tension mechanism. A sheet feeding device, wherein the continuous sheet is wound by using a back tension force on the continuous sheet.