JP3512427B2 - Recording paper supply device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper supply device, for example, a recording paper supply device using a roll-shaped recording paper such as a facsimile machine or a heat-sensitive recording device.

[0002]

2. Description of the Related Art As a conventional recording paper feeding device, for example, there is one shown in FIG. The recording paper supply device of the facsimile device shown in FIG. 3A is a heat-sensitive system including a thermal head 2 and a platen roller 3,
Normally, at the time of reception, as shown in FIG. 3B, the platen roller 3 repeatedly stops and rotates. That is, the displacement P of the outer periphery of the platen roller 3 (hereinafter, simply referred to as displacement P) is an intermittent drive with the passage of time.

In most of the heat-sensitive type facsimile machines 1, as shown in FIG. 3A, the recording paper 6 of the recording paper roll 5 accommodated in the box 4 is reversed by the reversing roller 7 and the platen. The roller 3 pulls and conveys. Some of the facsimile machines 1 do not have the reversing roller 7, and the recording paper roll 5 to the recording paper 6 in the box body 4 are transferred to the platen roller 3
There are some that are pulled directly.

On the other hand, since the platen roller 3 needs to bring the heating element of the thermal head 2 and the recording paper 6 into close contact with each other,
As shown in FIG. 4A, the roller has a rubber 3B wound around a core metal 3A.

[0005]

However, in such a conventional recording paper supply apparatus, since the recording paper roll 5 is housed in the box body 4, the platen roller 3 rotates to perform recording. When the paper 6 is pulled, the recording paper roll 5
When the platen roller 3 rotates due to frictional contact between the outer peripheral surface of the recording paper roll 5 and the inner surface of the box body 4, a back tension T is generated on the recording paper 6. When the back tension T is small, the rubber 3B of the platen roller 3 is not so much deformed as shown in FIG. 4B, but when the back tension T is large, the rubber 3B is not deformed as shown in FIG. 4C.
The deformation 3a occurs in B. Since the recording paper roll 5 has inertia in the rotation direction, the platen roller 3 stops and the recording paper 6
Even if the pulling of the recording paper 6 is stopped, the recording paper roll 5 rotates a little and the recording paper 6 sags. Due to these movements and the intermittent driving of the platen roller 3, the back tension T varies in strength.

At this time, the recording paper 6 is fed as shown in FIG. That is, in the section (A), the back tension T of the recording paper 6 is gradually increased from 0, and the deformation 3a of the rubber of the platen roller 3 is gradually increased. Therefore, the recording paper 6 lags behind the rotation amount of the platen roller 3. In the section (B), the back tension T of the recording paper 6 is almost constant and balanced with the deforming force of the rubber. Therefore, the deformation 3a of the rubber becomes constant and the platen roller 3
And the feed amount (displacement Q) of the recording paper match.

The platen roller 3 stops at the beginning of the section (C), but as described above, the recording paper 6 sags and the back tension T becomes close to zero. At this time, the rubber 3B of the platen roller tries to return from the deformed state to the original state, so that the recording paper 6 is pulled and sent. Printing is shown in Figure 5.
Since it is performed in the sections (1) to (5) of (a), in the above case, only L recording sheets are fed after printing is completed.
As shown in FIGS. 5B and 5C, when the rubber is not deformed, the printing becomes normal at equal intervals, and when the rubber is deformed, the output images overlap each other in the section (A) and the section (c )so,
The image is missing by the distance L. This phenomenon occurs every intermittent drive, and there is a problem in that an abnormal image called "white streaks" results.

As a method for solving such a problem,
The following methods are possible. (1) One is the back tension T that does not deform the rubber 3B of the platen roller 3. That is, the method in which the back tension T is close to zero. (2) Another method is to keep the back tension T of the recording paper 6 in a strong state so that the rubber 3B of the platen roller 3 remains deformed and does not return to its original state.

As shown in FIG. 6 (a), the paper tube 8 at the center of the recording paper roll 5 is provided with an outer diameter smaller than the inner diameter of the paper tube 8 as a means for carrying out the above method (1). The back tension T of the recording paper 6 becomes substantially zero by supporting the recording paper roll 5 so that both ends 9a of the shaft 9 do not come into contact with the box body 4 and slide through the shaft 9 which the recording paper 6 has.

As a means for carrying out the method (2) described above, there is one shown in FIG. 6 (b) described in Japanese Utility Model Publication No. 1-91561. This is because the one end 10a engages with the engaging portion 8a of the paper tube 8 of the recording paper roll 5 and the back tension of the recording paper can be constantly applied with the coil spring 10 that stores a predetermined rotation amount, and a certain torque is applied. The recording paper 6 is provided with a coiled clutch 10A that starts to slide when the temperature exceeds the limit.

However, such an arrangement as shown in FIG.
When the recording paper roll 5 is replaced with the one shown in (a) or (b), the shaft 9 must be passed through the paper tube 8 of the recording paper roll, which increases the time and effort for replacement of the recording paper roll 5. There is a problem. In addition, in the structure shown in FIG. 6B, in addition to the shaft 9, a coil spring is further provided.
There is also a problem in that the required back tension is difficult to obtain due to the variation in the dimensions of the parts as well as the increase in cost due to the requirement of 10, 10A and the like.

The present invention has been made against the background of such a conventional technique. By providing a back tension fluctuation suppressing means on the recording paper roll side of the supply roller , fluctuation of the back tension T applied to the recording paper is suppressed. has been reduced, improving the feeding accuracy of the recording paper, it is possible to obtain a proper image, eliminating the user effort, can also lower cost, also, the back tension fluctuation suppressing means supplying roller <br/> of A guide roller made of an elastic member that is softer than the outer periphery,
Can with a simple configuration, further, by the elastic member and the foamed resin, further, an object of the invention to provide a supply device of the record paper that can smoothly suppressed.

[0013]

The invention according to claim 1 is
Holding means for holding the outer peripheral surface of the recording paper roll , which is formed by winding the recording paper in a roll shape, and an outer peripheral portion made of an elastic member , and the recording paper is counteracted against the back tension applied to the recording paper. In a recording paper supply device having a supply roller that supplies so as to pull out, a back tension fluctuation suppressing unit that is disposed on the recording paper roll side of the supply roller and that suppresses fluctuations in back tension applied to the recording paper. provided, comprising a rotatable guide roller for the back tension variation suppressing means for guiding engaged with the recording paper, the outer peripheral portion of the guide roller is made of soft elastic material from the outer peripheral portion of said feed roller, said The outer circumference of the guide roller is the recording paper
The back tension applied to the recording paper is elastically deformed by the increase or decrease of the back tension applied to the recording paper, and the fluctuation of the back tension applied to the recording paper is suppressed. According to a second aspect of the present invention, in the recording paper feeding apparatus according to the first aspect, the elastic member of the guide roller is made of foamable resin.

[0014]

According to the first aspect of the present invention, when the back tension applied to the recording paper is increased or decreased, the soft outer peripheral portion of the guide roller engaging with the recording paper is deformed before the deformation of the supply roller. It reduces the length of the path through which the recording paper passes, and suppresses the back tension from increasing or decreasing. Therefore, the supply roller rotates with a substantially constant outer diameter.

[0015] In the second aspect of the present invention, since the guide roller of claim 1, wherein there is a foamed resin, suppressing the fluctuation of smoothly back tension has a proper flexibility.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a diagram showing a first embodiment of a feed device for a recording paper according to this onset bright. First, the configuration will be described. Figure 1
In FIG. 3A, reference numeral 11 is a receiving portion of the facsimile apparatus, and the receiving portion 11 is a recording paper roll 13 in which a thermosensitive recording paper 12 is wound in a roll shape, and a holding means for holding the recording paper roll 13. The holding case 15, the thermal head 16 as a heating element for printing the received information on the recording paper 12, and the back tension T applied to the recording paper 12 from the holding case 15 against the backing tension T of the recording paper 12 to the lower side of the thermal head 16. A platen roller 17, which is a supply roller that is supplied so as to be pulled out and is in pressure contact with the thermal head 16. Since the platen roller 17 brings the heating element of the thermal head 16 and the recording paper 12 into close contact,
As shown in (a), it is a roller in which rubber 17A is wound around a core metal.

Reference numeral 20 denotes a guide roller which is a means for suppressing back tension fluctuation. The guide roller 20 is located on the recording paper roll 13 side from the platen roller 17 and the platen roller 17 and the recording paper roll.
The recording paper 12 is provided substantially in the center of the recording paper 12 and is pressed in the direction in which the recording paper 12 is engaged with the recording paper roll 13 and is wound around the recording paper roll 13 so as to be inverted. It is a rotatable roller that guides to the roller 17 side.

The guide roller 20 is a cored bar 21, a soft rubber 22 which is an elastic member softer than the rubber 17A of the platen roller 17 on the outer peripheral portion of the recording paper 12, or a sponge-like foaming resin, for example. Recording paper roll 13, holding case 15, guide roller
20 and the platen roller 17 constitute a recording paper supply device 25. Next, the operation will be described.

In FIG . 1, a guide roller 20 is provided on the recording paper roll 13 side of the platen roller 17 so as to invert the recording paper 12 substantially at the center between the platen roller 17 and the recording paper roll 13, so that the facsimile is provided. When the apparatus receives, the platen roller 17 repeatedly stops and rotates, and when intermittently driven, when the back tension T of the recording paper 12 tries to change so as to increase, a guide roller that guides the recording paper 12
Since the soft rubber 22 of 20 is softer than the rubber 17A of the platen roller 17, the soft rubber 22 is shown in FIG.
As shown in (c), the deformation of the recording paper 12 is increased by being pressed against the recording paper 12, and the recording paper roll 13 passes through the platen roller.
The soft rubber 22 is compressed so as to reduce the path length up to 17, and the increase of the back tension T is suppressed.

On the other hand, when the back tension T of the recording paper 12 is changed so as to be small, the deformation of the soft rubber 22 of the guide roller 20 is changed to the original circular shape and is reduced as described above. Paper roll passing through guide roller 20
The path length from 13 to the platen roller 17 has increased
The occurrence of the slack of 12 is prevented and the reduction of the back tension T is suppressed. Therefore, the platen roller 17 rotates with a substantially constant outer diameter even if the back tension T increases or decreases. Therefore, as shown in FIG. 1D, the feeding amount of the recording paper 12 is the same as the displacement amount d of the displacement P of the platen roller and the displacement amount d of the displacement Q of the recording paper except the first displacement amount d ′. Yes,
The rotation speed of the platen roller 17 is substantially matched, the feeding accuracy of the recording paper 12 is improved, and an appropriate image without white lines can be obtained. In addition, the user does not need to take the recording paper roll 13 through the shaft. Further, the soft rubber 22 is provided only on the outer peripheral portion of the guide roller 20, which allows a simple structure and a low cost.

Further, when the soft rubber 22 is made of a sponge-like foamed resin, the increase and decrease of the back tension T can be suppressed more smoothly with appropriate flexibility.
And the cost can be further reduced. FIG. 2 is a diagram showing a second embodiment of the recording paper feeding apparatus according to the present invention , which is the above-mentioned first embodiment.
The same components as those in the embodiment are designated by the same reference numerals.

A recording paper supply device 35 provided substantially at the center between the platen roller 17 and the recording paper roll 13 (not shown) of the receiving section 31 of the facsimile machine shown in FIG.
A guide roller 36 engaged with the guide roller 36, a guide 37 which is a guide member for movably guiding the guide roller 36 in an oblique vertical direction K intersecting the supply direction of the recording paper 12, and a back tension T of the recording paper 12. A spring 38, which is an urging member that urges the guide roller 36 downwardly in the obliquely vertical direction K, is adjustable.

In the recording paper supply device 35, when the back tension T of the recording paper 12 is changed so as to increase, the guide roller 36 for guiding the recording paper 12 is provided with a spring 38.
Against the urging force of the recording sheet 12, it moves obliquely upward along the guide 37, the path length through which the recording paper 12 passes is reduced, and the increase in the back tension T is suppressed. On the other hand, when the back tension T of the recording paper 12 is changed so as to be small, the guide roller 36 is guided by the urging force of the spring 38 as described above.
Along the line 37, the recording paper 12A moves in a direction in which the path length increases. Therefore, the recording paper 12 does not sag, and the reduction of the back tension T is suppressed. Therefore, even if the back tension T varies, the platen roller 17 rotates with a substantially constant outer diameter, and the feeding of the recording paper 12 substantially coincides with the rotation speed of the platen roller 17, so that the feeding accuracy of the recording paper 12 is significantly increased. It is possible to improve and obtain an appropriate image.

[0024]

As described above, according to the first aspect of the present invention.
According to this, by providing the back tension fluctuation suppressing means on the recording paper roll side of the supply roller , fluctuations in the back tension T applied to the recording paper are suppressed and reduced,
It is possible to improve the feeding accuracy of the recording paper, obtain an appropriate image, save the user's trouble, and reduce the cost . Also,
The back tension fluctuation suppressing means is a guide roller made of an elastic member that is softer than the outer peripheral portion of the supply roller .
This simplifies the configuration. Further, according to claim 2 ,
When the elastic member is made of foamable resin, it can be suppressed more smoothly.

[0025]

[Brief description of drawings]

Figure 1 is a view showing a first embodiment applied to a receiving portion of the supply device of the recording paper according to this onset bright facsimile apparatus,
(A) is a front view of an essential part thereof, (b) is a front view of the guide roller, (c) is a front view showing the action of the guide roller,
(D) is a graph showing the displacement of the platen roller and the displacement of the recording paper with respect to time.

2 is a partial front view showing the second embodiment applied to the receiving portion of the supply device of the recording paper according to this onset bright facsimile apparatus.

3A and 3B are views showing a recording sheet feeding device of a receiving portion of a conventional facsimile apparatus, FIG. 3A is a front view of a main portion thereof, and FIG. 3B is a graph showing displacement of the platen roller with respect to time. is there.

4A and 4B are views showing a platen roller of the recording paper feeding device shown in FIG. 3, in which FIG. 4A is a front view thereof, FIG. 4B is a front view thereof when there is no back tension, and FIG. It is the front view in the case.

5A and 5B are diagrams showing an operation of a platen roller of the recording paper feeding device shown in FIG. 3, FIG. 5A is a diagram showing displacement of the platen roller and recording paper with respect to time, and FIG. 5B is a platen roller. 3B is a front view showing the printing on the recording paper when there is no rubber deformation, and FIG. 7C is a front view showing the printing on the recording paper when there is the rubber deformation of the platen roller.

FIG. 6 is a view showing another conventional recording paper feeding device,
(A) is a front view showing the recording roll, and (b) is an exploded view showing still another recording paper feeding device.

[Explanation of symbols]

12 Recording paper 13 Recording paper roll 15 Holding case (holding means) 17 Platen roller (supply roller) 17A Rubber (supply roller) 20, 36 Guide roller (back tension fluctuation suppressing means) 21 Core bar 22 Soft rubber (elastic member) 25 , 35 Recording paper feeding device 37 Guide 38 Spring P Platen roller displacement Q Recording paper displacement T Back tension K Oblique vertical direction

   ─────────────────────────────────────────────────── ─── Continued front page       (56) References Japanese Patent Laid-Open No. 59-153749 (JP, A)                 JP 54-56518 (JP, A)                 JP 63-12562 (JP, A)                 58-96971 (JP, U)                 Actual Development Sho 60-195851 (JP, U)                 Actual Development Sho 60-159754 (JP, U)

Claims (2)

(57) [Claims] 1. A holding means for holding an outer peripheral surface of a recording paper roll, which is a roll of recording paper, and an outer member made of an elastic member.
A supply roller which has a peripheral portion and supplies the recording paper so as to pull it out against the back tension applied to the recording paper;
In a recording paper feeding device having a back tension fluctuation suppressing means arranged on the recording paper roll side of the supply roller and suppressing fluctuations in back tension applied to the recording paper, the back tension fluctuation suppressing means An outer peripheral portion of the guide roller is provided, which has a rotatable guide roller that engages with and guides the recording paper, and the outer peripheral portion of the guide roller is made of an elastic member softer than the outer peripheral portion of the supply roller.
Is caused by increasing or decreasing the back tension applied to the recording paper.
A recording paper feeding device, which suppresses fluctuations in back tension applied to the recording paper due to property deformation . 2. The recording paper feeding apparatus according to claim 1, wherein the elastic member of the guide roller is made of foaming resin.