JPH0676244U - Roll paper support structure - Google Patents

Abstract

(57) [Summary] [Purpose] In order to impart a uniform curl removal effect to the recording paper fed from the roll paper, the tension applied to the fed recording paper automatically increases as the residual diameter of the roll paper becomes smaller. A roll paper support structure is provided. [Structure] A holder 42 is inserted into the inner space of a core C of a roll paper R from both sides to rotatably support the roll paper R around the holder 42, and elastically deforms in the holder 42 in an inserted state. A pressing claw 44 that is pressed against the inner peripheral surface of the roll paper R is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a roll paper support structure applied to an image recording apparatus such as a facsimile machine which uses roll paper for recording paper.

[0002]

[Prior art]

 In an image recording device that uses roll paper as the recording paper, the roll paper is rotatably set in a recording paper storage box provided inside the main body of the device so that the recording paper fed out from the roll paper is conducted to the recording section. Although common, recording paper that is generally fed from roll paper has a problem that it has a curl habit when wound on roll paper.

Therefore, many image recording apparatuses using roll paper are provided with a curl prevention measure for the recording paper fed from the roll paper. To prevent this curl, a paper guide (V-shaped guide, etc.) that bends the recording paper in the direction opposite to the winding direction of the roll paper is provided in the feeding path of the recording paper, and the recording paper is properly guided along the paper guide. It is common to remove the curl habit of the recording paper by conducting it in a tensioned state under application of various tensions.

[0004]

[Problems to be solved by the device]

 However, it is recognized that the conventional curl prevention measures cannot achieve a uniform curl removing effect over the entire length of the recording paper fed from the roll paper. This is because the strength of the curl habit of the recording paper becomes stronger as the residual diameter of the roll paper becomes smaller, while the curl removal strength applied to the recording paper at the reverse curl part of the paper guide. Is approximately proportional to the amount of tension applied to the recording paper, and a uniform curl removing effect cannot be obtained unless the tension of the recording paper is changed according to the roll paper diameter.

Based on the above-mentioned results, the present invention is added to the recording paper fed out as the residual diameter of the roll paper becomes smaller, for the purpose of imparting a uniform curl removing effect to the recording paper fed out from the roll paper. It is intended to provide a roll paper support structure in which the tension to be automatically increased.

[0006]

[Means for Solving the Problems]

 In the roll paper support structure based on the present invention, as a means for achieving the above object, the holder is inserted from both sides into the inner space of the roll paper core, and the roll paper is rotatable around the holder. The holder is provided with an elastic member that is pressed into contact with the inner peripheral surface of the core of the roll paper in the inserted state.

[0007]

[Action]

 With this structure, when the recording paper is fed out from the roll paper, the roll paper is rotated from both sides around the holder inserted in the inner space of the core. Due to the elastic member of the holder that is pressed into contact, a substantially constant rotational restraint (breaking) torque is applied. Then, in the steady feeding state of the recording paper, the rotation restraint torque and the rotating torque obtained by multiplying the feeding tension of the recording paper by the radius of the roll paper are balanced, and the recording paper is continuously fed from the roll paper while rotating the roll paper. Will be sent to. Therefore, according to this support structure, when the residual diameter of the roll paper is large, the feeding tension applied to the recording paper is relatively small, and as the residual diameter of the roll paper becomes smaller, the feeding tension is gradually increased. It is possible to obtain a variable tension characteristic.

[0008]

【Example】

 FIG. 1 shows an outline of a roll-paper-type facsimile machine as an application example of the roll-paper support structure according to the present invention, and FIGS. 2 to 5 show a recording-paper storage box mounted on the facsimile machine. The details of the roll support structure provided in the recording paper storage box are illustrated. Therefore, first, an overview of the entire apparatus will be described with reference to FIG.

In this facsimile apparatus, a roll paper obtained by winding a long recording paper (heat sensitive paper) around a core (paper tube) C in a recording paper storage box 2 provided at the rear end of the apparatus main body 1. R is rotatably set. The recording paper P is fed from the built-in roll paper R by a platen roller 3 provided in front of the built-in roll paper R through a paper path passage 13 above a paper guide 2A which is integrally projected from the upper end of the front part of the recording paper storage box 2. Then, printing is performed by the thermal head 4 pressed against the lower surface of the platen roller 3.

At this time, the recording paper P fed from the lower side of the roll paper R in the recording paper storage box 2 and conducted to the paper path passage 13 above the paper guide 2A is the upper edge 2a of the paper guide 2A. At this portion, the roll paper R is folded in the direction opposite to the winding direction, and the curl removal having a strength commensurate with the feeding tension is given to the recording paper P at the reverse curl portion 2a.

Subsequently, the printed recording paper P printed by the thermal head 4 is conducted through the paper path passage 14 to the cutter unit 5 immediately after it is cut, and then the printed / cut recording paper P is After passing through a curved paper path passage (U-turn discharge path) 15 formed between the front paper guides 12a and 12b to make an upward U-turn, a paper discharge roller 6 and a pinch roller provided at the exit thereof. The recording paper is discharged from the recording paper discharge port 8 on the recording paper discharge portion 10 provided in the recording paper cover 9 that covers the upper surface of the main body.

In the above-mentioned facsimile apparatus, the thermal head 4, the cutter unit 5, and the paper guides 12a arranged under the paper path passages 13, 14, 15 are attached to the apparatus main body 1 side, while the platen The roller 3, the paper discharge roller 6, the pinch roller 7, the paper guide 12b disposed above the paper path passages 13, 14, 15 and the like, except the one formed integrally with the cutter unit 5, cover the recording paper cover. It is attached to the 9 side.

The recording paper cover 9 has a hinge portion 11 for pivotally supporting both sides of a rear end portion of a cover frame (not shown) on the apparatus body 1 to cover the recording paper storage box 2 and a recording paper discharge path in front of the box. Is mounted on the main body 1 of the apparatus so as to be openable and closable, and at the front end thereof is provided a document mount section 16 for setting a transmission document to be fed into a transmission section described later, and on the inner surface of the document mount section 16. A recording paper presser 17 for pressing the recording paper P discharged from the recording paper discharge port 8 to the recording paper discharge unit 10 on the cover from above is swingably attached.

In addition, in FIG. 1, reference numerals 20 and 21 denote paper sensors provided in the feeding and discharging path of the recording paper P, and 22 denotes the paper sensor loaded in the document mount section 16 and fed to the reading section. Reference numeral 23 denotes an optical reading system at the front end of the apparatus to be conveyed, and 23 denotes an optical reading system provided in the main body 1 facing the reading unit of the transmitting unit 22. Reference numeral 24 denotes a power supply unit mounted on the rear end of the apparatus body 1.

Next, with reference to FIG. 2 to FIG. 4, details of the recording paper storage box 2 mounted in the facsimile machine and the support structure of the roll paper R provided in the recording paper storage box 2 will be described in detail. explain.

The recording paper storage box 2 is composed of a rectangular box body having an open top, and is formed of a plastic integrally molded product except for the central portion of the bottom formed by a separate bottom lid 2B. There is. In this recording paper storage box 2, a holder support portion 30 for supporting a holder to be described later is recessed on the inner wall on the right side which is the set reference end of the storage roll paper R, and on the left side on the opposite side. A partition plate 31 for partitioning the inside of the box in the longitudinal direction according to the width of the roll paper R is detachably attached.

The details of the partition plate 31 and the mounting structure of the partition plate 31 to the recording paper storage box 2 are as follows. The partition plate 31 is provided with a protrusion 32 at a lower portion of a front edge thereof and a protrusion 33 at a central portion of a rear edge thereof, and is integrally molded with the partition plate 31 from an upper end of the rear edge portion and can be tilted forward and backward. The tilting lever 34 is projected upward, and the lock claw 35 is projected from the rear edge of the bent portion of the lever 34. On the other hand, on the inner surface of the recording paper storage box 2, the projection 32 of the partition plate 31 is fitted in the lower portion of the front wall portion at a position corresponding to the roll paper RA of A4 width and the roll paper RB of B4 width. The holes 36 are provided with grooves 37 in which the protrusions 33 of the partition plate 31 are fitted, respectively, on the upper portion of the rear wall portion, and the locking claws 35 provided on the lever 34 of the partition plate 31 are provided in the vicinity of the upper ends of the grooves 37. Are provided with holes 38, respectively.

When the partition plate 31 is attached to the recording paper storage box 2, the protrusion 32 at the lower portion of the front edge is inserted into the insertion hole 36, and the protrusion 33 at the central portion of the rear edge is inserted into the groove 37 from above. When the lock claw 35 of the lever 34 is engaged with the hole 38 of the groove 37, the mounting is completed. Also, when removing the partition plate 31 when replacing it, it is easy to first tilt the lever 34 forward to allow the lock claw 35 to escape from the hole 38 of the groove 37, and then pull the partition plate 31 upward. Can be pulled out.

In addition, a right and left side walls of the partition plate 31 are provided with a pair of left and right holder support parts 39, which are provided on the right side inner wall of the recording paper storage box 2 so as to be recessed. There is. The support portion holder 39 and the holder support portion 30 on the inner wall of the box (not shown in FIG. 2) have the same shape. Then, a pair of holders 42 of the same kind for supporting the shaft center of the roll paper R are detachably attached to the holder support portion 30 provided on the recording paper storage box 2 and the holder support portion 39 provided on the partition plate 31. I am trying.

As shown in FIGS. 2 and 5, the holder 42 has a cylindrical holder body 43 that is inserted into the inner space of the core (paper tube) C of the roll paper R and a cantilevered holder body 43. A plate-shaped mounting piece portion 45 that also functions as a supporting portion is integrally provided, and a pressing claw (elastic member) 44 in which a protrusion 44a is bulged from the outside of the tip is provided at the bottom of the holder main body 43. Has been done. The holder main body 43 is elastically deformed inward by the protrusion 44a provided at the tip of the pressing claw 44 in contact with the inner peripheral surface of the core while being inserted into the inner space of the core of the roll paper R. The protrusion 44a is pressed against the inner peripheral surface of the winding core. On the other hand, an elongated bullet piece 46 whose lower end is bent inward is hung from both sides of the attachment piece portion 45, and a small projection 47 is projected outward from the vicinity of the bent portion of each bullet piece 46. .

The holder 42 has the holder main body 43 inserted into the inner space of the core of the roll paper R, and the holder support portion 30 provided with the holder mounting piece portion 45 in the recording paper storage box 2 and the partition plate 31. It is attached by inserting it from above into the holder supporting portion 39 provided on the. At that time, the bullet pieces 46 provided on both sides of the mounting piece portion 45 flexibly enter along the stepped portions 40 formed on both sides of the holder support portions 30 and 39 while expanding, and the small protrusions of the bullet piece 46 are inserted. The holder 42 is locked to the holder supporting portions 30 and 39 at a predetermined mounting position in a state where 47 is elastically engaged with the engaging concave portion 41 provided in the step portion 40.

Therefore, when the roll paper R is stored in the recording paper storage box 2, the holders 42 are inserted into both sides of the roll paper R by inserting the holders 42 into the inner space of the core of the roll paper R from both sides. One of them is attached to and supported by a holder support portion 30 provided on the inner wall on the right side of the recording paper storage box 2, and the other is changed on the left side of the recording paper storage box 2 according to the paper width of the roll paper R. It is attached to and supported by a holder support portion 39 provided on the side wall of the partition plate 31 which is possible.

Thus, the roll paper R set in the recording paper storage box 2 is rotatably supported around the holder 42 inserted from both sides in the inner space of the winding core, and the holder 42 is provided. The presser pawls 44 are elastically deformed, and the portions of the protrusions 44a are pressed against the inner surface of the winding core.

The operation of the roll paper support structure configured as described above is shown in FIG. In this structure, when the recording paper P is fed out from the roll paper R by the rotation of the platen roller 3, the roll paper R is rotated from both sides around the holder 42 inserted in the inner space of the winding core. The roll paper R is subjected to a substantially constant rotation restraint (brake) torque T obtained by multiplying the contact pressure by the friction coefficient by the pressing claw 44 of the holder 42 which is pressed against the inner peripheral surface of the winding core at the projection 44a. Will be. In the steady feeding state of the recording paper P, the rotation restraint torque T and the rotational torque obtained by multiplying the feeding tension F of the recording paper P by the radius r of the roll paper R are balanced (F · r = T), The recording paper P is continuously fed from the roll paper R while rotating the roll paper R.

Therefore, according to this support structure, when the residual diameter r (initial radius r0) of the roll paper R is large, the feeding tension F (initial tension F0) applied to the recording paper P is relatively small. As the residual diameter r of the roll paper R becomes smaller as the recording paper P is consumed, the tension variable characteristic in which the feeding tension F is gradually increased (F> F0) is obtained.

Therefore, if this support structure is adopted, the recording paper P unrolled from the roll paper R and conducted on the upper edge (reverse curl portion) 2a of the paper guide 2A in a tensioned state is rolled onto the recording paper P. As the residual diameter r decreases, a greater curl removing effect can be exerted, and further, it becomes possible to obtain a uniform curl removing effect over the entire length of the recording paper P fed from the roll paper R.

Needless to say, the reverse curl imparting mechanism for recording paper, which is provided in combination with the roll paper supporting structure according to the present invention, is not necessarily limited to that shown in the embodiment. Further, the type of the elastic member provided in the holder inserted in the inner space of the roll paper core does not hinder the change from that shown in the embodiment.

The roll paper support structure according to the present invention is not limited to the facsimile apparatus of the type described in the embodiment, but an image recording apparatus of a type that incorporates roll paper as recording paper can be used as a measure for curling the recording paper. Generally applicable.

[0029]

[Effect of device]

 As described above, according to the roll paper supporting structure of the present invention, when the remaining diameter of the roll paper is large, the feeding tension applied to the recording paper is relatively small and the remaining diameter of the roll paper is small. A variable tension characteristic in which the tension is gradually increased is obtained. Therefore, if this support structure is used together with a reverse curl imparting mechanism that reversely curls the recording paper fed from the roll paper in the feeding path, it is possible to achieve a uniform curl removal effect over the entire length of the recording paper P, which has not been realized until now. Can be accommodated.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a facsimile apparatus showing an application example of a roll paper support structure according to the present invention.

FIG. 2 is an exploded perspective view of the recording paper storage box shown in FIG.

3 is a plan view of the recording paper storage box shown in FIG. 1. FIG.

FIG. 4 is a detailed view of a main part of FIG.

5 is a vertical cross-sectional view of the roll paper holder shown in FIG.

[Explanation of symbols]

 1 Device Main Body 2 Recording Paper Storage Box 2A Paper Guide 2a Upper Edge (Reverse Curl Area) 2B Bottom Lid 3 Platen Roller 4 Thermal Head 5 Cutter Unit 9 Recording Paper Cover 30 Holder Support 31 Partition Plate 39 Holder Support 42 Holder 43 Holder Main body 44 Elastic member (pressing claw) 44a Protrusion 45 Mounting piece R Roll paper C Core (paper tube) P Recording paper

Claims (1)

[Scope of utility model registration request] 1. A roll paper core inner peripheral surface is inserted into the holder by inserting a holder into the inner space of the roll paper core from both sides to rotatably support the roll paper around the holder. A roll paper support structure comprising an elastic member pressed against the roll paper.