JP2012121674A - Rolled paper winding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow winding with the optimum frictional force in response to an amount of a rolled paper sheet 5c, by simple control and inexpensive constitution, and to prevent a wrinkle and a crimp from being generated by the winding under a slackened state, and the rolled paper sheet 5c from being damaged with an excessive tension.SOLUTION: This rolled paper winding mechanism 1 includes a rolled paper supply part 5 for feeding a rolled paper sheet 5a, a treating part 2 for applying prescribed treatment to the fed rolled paper sheet 5a, a rolled paper discharge part 3 for discharging a rolled paper sheet 5b after treated, at a prescribed discharge speed, and a rolled paper winding part 4 for winding the discharged rolled paper sheet 5b, by a winding roller 7 journalled onto rotary shafts arranged respectively in parallel, and a friction coefficient switching means is provided to switch a frictional force of the winding roller 7 in response to the amount of the rolled paper sheet 5c wound by the winding roller 7.

Description

  The present invention relates to a roll paper take-up mechanism in a journal recording device or the like that performs a process such as printing on a roll-like medium and winds and stores the medium.

  As shown in FIG. 8, a roll paper take-up mechanism 101 in a conventional journal recording apparatus or the like has a roll paper supply unit 5 that supplies roll paper 5a wound in a roll shape, and performs predetermined processing such as printing on the roll paper. The processing unit 2 applied to 5a, the roll paper discharge unit 3 that discharges the roll paper 5b that has been subjected to predetermined processing, and the roll paper winding unit 104 that winds the discharged roll paper 5b.

  The roll paper 5a fed from the roll paper supply unit 5 is discharged at a discharge speed v1 by the rotation of the discharge roller 6 of the roll paper discharge unit 3 while performing predetermined processing such as printing in the processing unit 2. .

  Then, since the discharged roll paper 5b has a curl ridge caused by being wound in a roll shape, the roll paper 5b is discharged along the curl ridge in the direction of arrow E and the discharge operation is continued. The roll paper take-up unit 104 is reached while the curl is held and the position is lowered by its own weight.

  In the roll paper take-up unit 104, a take-up roller 107 is disposed at a position where the leading end of the roll paper falls as an appropriate position in consideration of characteristics such as hardness and weight of the roll paper to be used. The winding roller 107 is provided on each of two parallel shafts so as to wind the roll paper 5b, and rotates in the arrow C by rotating the shaft by a motor or the like (not shown).

  Then, the roll paper 5c on the take-up roller 107 is taken up in a roll shape as indicated by an arrow D at the take-up speed v2 due to the frictional force and curl wrinkle received from the take-up roller 107.

  Incidentally, when the winding speed v2 of the roll paper 5b to be wound is slower than the discharge speed v1 for discharging the roll paper 5b from the roll paper discharge section 3, as shown in FIG. 9, the roll paper 5b is discharged within an arbitrary time. The length of the roll paper 5b is shorter than the length of the roll paper 5c wound up within the same time, and as a result, only the difference in the length as shown in the outermost roll paper 5z in FIG. Without being wound up, it becomes a surplus length between the roll paper discharge unit 3 and the roll paper take-up unit 104, and the tension becomes low.

  In this case, the longer the winding time is, the longer the slacking length is increased and the roll paper 5b cannot be normally wound, and the roll paper 5z in the outermost periphery in FIG. It winds up as it is, and wrinkles, breakage, etc. occur.

  On the other hand, when the winding speed v2 is faster than the discharging speed v1, the slack as described above does not occur, but the roll paper 5b is pulled between the roll paper discharging unit 3 and the roll paper winding unit 104, If a strong tension is generated and the static frictional force between the winding roller 107 and the roll paper 5b is small with respect to the tension of the roll paper 5b, the excess of the winding speed v2 is caused by the roll paper 5b on the surface of the winding roller 107. It is absorbed by sliding and normal winding is performed.

  When the winding speed v2 is equal to the discharge speed v1, normal winding is possible. However, once slackening occurs due to disturbance or the like, automatic removal cannot be performed.

  Therefore, the roll paper 5b can be normally wound up if the winding speed v2 is made slightly faster than the discharge speed v1.

  As described above, in order to control the winding speed v2 to be slightly faster than the discharge speed v1, the tension detecting means for detecting the tension of the roll paper is provided, and the degree of the winding tension of the roll paper is followed. There has been a roll paper winding mechanism that optimizes the tension of the roll paper by fuzzy control (see, for example, Patent Document 1).

JP-A-3-36145

  However, the roll paper winding mechanism having the above-described configuration requires complicated control, and requires a CPU that performs high-speed processing, a mechanism for accurately detecting tension, and the like, which hinders cost reduction. It was.

  The present invention adopts the following configuration in order to solve the above-described problems. That is, a roll paper supply unit that delivers the roll paper, a processing unit that performs a predetermined process on the fed roll paper, a roll paper discharge unit that discharges the processed roll paper at a predetermined discharge speed, and the discharged paper A roll paper take-up mechanism comprising a roll paper take-up portion for taking up roll paper by a take-up roller supported by a rotating shaft arranged in parallel, wherein the roll paper is taken up by the take-up roller. Friction coefficient switching means for switching the frictional force of the winding roller according to the amount is provided.

  According to the roll paper winding mechanism of the present invention, since it is configured as described above, the roll paper is wound and slackened with an optimum frictional force according to the amount of the rolled paper with a simple control and an inexpensive configuration. The roll paper is not taken up and does not cause wrinkles or breakage, or the roll paper is not damaged due to excessive tension.

3 is a configuration diagram of a roll paper winding unit of the roll paper winding mechanism of Embodiment 1. FIG. 6 is an operation explanatory diagram of a roll paper winding unit of the roll paper winding mechanism of Embodiment 1. FIG. 6 is a configuration diagram of a roll paper winding unit of a roll paper winding mechanism of Embodiment 2. FIG. 6 is a configuration diagram of a roll paper winding unit of a roll paper winding mechanism of Embodiment 3. FIG. 6 is a configuration diagram of a roll paper winding unit of a roll paper winding mechanism of Embodiment 4. FIG. FIG. 10 is a configuration diagram of a roll paper winding unit of a roll paper winding mechanism according to a fifth embodiment. FIG. 10 is a configuration diagram of a roll paper winding unit of a roll paper winding mechanism according to a sixth embodiment. It is a block diagram of the conventional roll paper winding mechanism. It is operation | movement explanatory drawing of the conventional roll paper winding mechanism. It is operation | movement explanatory drawing of the roll paper winding part of the conventional roll paper winding mechanism.

  Embodiments of the present invention will be described below with reference to the drawings. Elements common to the drawings are given the same reference numerals. In the following description, roll paper is described as an example of a roll-shaped medium. However, a roll-shaped medium, a roll-shaped sheet, or the like may be used as long as it is a roll-shaped medium.

(Constitution)
FIG. 1 shows a configuration of a roll paper winding mechanism 1 according to the first embodiment. As shown in the figure, in the roll paper winding mechanism 1 according to the first embodiment, the configuration of the roll paper winding unit 4 is different from the conventional one, and the winding roller 7 is disposed on the inner side with a low coefficient of static friction arranged coaxially. A winding roller 7a and an outer winding roller 7b having a high coefficient of static friction are configured. By driving an actuator 10 as a driving means in the direction of arrow F or G, the winding roller 7a is linked via the link portion 10a. , 7b can be moved in the direction of arrow A or arrow B, and the friction coefficient switching means is provided.

  Further, as shown on the right side of FIGS. 1A and 1B, a roll paper detection sensor 11 capable of detecting the diameter of the roll paper 5b is arranged on the upper side of the wound roll paper 5c as roll paper detection means. ing. The roll paper detection sensor 11 is composed of light emitting / receiving elements facing each other, and may detect the diameter of the roll paper 5b depending on whether light is blocked. The other configuration is the same as the configuration of the conventional roll paper take-up mechanism of FIG. 8, and therefore detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the first embodiment operates as follows. This operation will be described in detail below with reference to the configuration diagram of FIG. 1 and the operation explanatory diagram of FIG.

  By the way, the roll paper 5b wound while being rotated as indicated by the arrow D by the winding roller 7 rotating as indicated by the arrow C is generally a thin paper, and its mass per unit area is extremely light. It is necessary to apply a frictional force to the lightweight roll paper 5b so as not to slip on the surface of the winding roller, and the winding roller 7 requires a high coefficient of friction.

  Then, as the amount of roll paper 5c wound up increases, the state of FIG. 1 (a) and FIG. 2 (a) transitions to the state of FIG. 1 (b) and FIG. The mass of the rolled paper 5c increases from Wr1 to Wr2.

  Then, as shown in FIG. 2C, the static friction coefficient of the contact point between the wound roll paper 5c and the winding roller 7 is μ, and the center of the wound roll paper 5c and the contact point are formed. Assuming that the angle is θ, the vertical drag N at the contact point is N = Wr · cos θ. Therefore, the maximum frictional force f between the outermost roll paper 5z and the winding roller 7 is expressed by f = μ · Wr · cos θ. The maximum frictional force f increases from f1 to f2 as the mass Wr of the wound roll paper 5c increases.

  That is, when the roll paper 5c wound up is small, the maximum frictional force f is small, the outermost roll paper 5z and the winding roller 7 slide, and the winding speed v2 decreases. On the other hand, when there are many roll papers 5c wound up, the maximum frictional force f increases, the winding speed v2 increases too much, and the tension becomes excessively large.

  Therefore, in the roll paper winding mechanism 1 according to the first embodiment, when the roll paper detection sensor 11 determines that the amount of the rolled paper 5c is small, the actuator 10 is moved to the arrow F as shown in FIG. The winding roller 7a, 7b is moved inward as indicated by an arrow A, and the winding operation is performed in a state where the outermost roll paper 5z is placed on both the winding rollers 7a, 7b.

  As a result, the static frictional force f generated between the outermost roll paper 5z and the take-up rollers 7a and 7b is such that the take-up roller 7b having a high friction coefficient μ and the take-up roller 7a having a low friction coefficient μ Since it is in contact with the roll paper 5z, a sufficient static frictional force f can be obtained even when the roll paper 5c wound up is small and the mass is small, and between the outermost roll paper 5z and the take-up rollers 7a and 7b. Therefore, the relationship that the winding speed v2 is slightly faster than the discharge speed v1, that is, the relation of v2≈v1 and v2> v1 can be maintained.

  On the other hand, when the amount of the rolled paper 5c is increased and the roll paper detection sensor 11 determines that the amount of the rolled paper 5c is large, the actuator 10 is moved as shown in FIG. Driving in the direction of arrow G, the winding rollers 7a and 7b are moved outward as indicated by arrow B, and the winding operation is performed with the outermost roll paper 5z on only the winding roller 7a.

  As a result, the static frictional force f generated between the outermost roll paper 5z and the take-up roller 7a is wound because only the take-up roller 7a having a low friction coefficient μ contacts the outermost roll paper 5z. Even if the roll paper 5c increases and the mass increases, the static friction force f between the outermost roll paper 5z and the take-up roller 7a can be reduced to obtain an appropriate static friction force f. The tension of the roll paper 5z can be kept from becoming excessive, and the relationship in which the winding speed v2 is slightly faster than the discharging speed v1, that is, the relation of v2≈v1 and v2> v1 can be maintained.

  In the above description of the embodiment, an example in which the winding rollers 7a and 7b are winding rollers having different static friction coefficients μ has been described. However, the winding rollers 7a and 7b have the same static friction coefficient μ, and winding is performed. The contact area may be changed depending on the amount of roll paper 5c.

(Effect of Example 1)
As described above, according to the roll paper winding mechanism of the first embodiment, the winding roller is constituted by the winding roller having the low static friction coefficient and the winding roller having the static friction coefficient, which are arranged coaxially and symmetrically. A roll paper detection sensor for detecting the amount of roll paper taken, and an actuator for moving the take-up roller in the direction of the rotation axis, wherein the take-up roller is moved in the direction of the rotation axis based on the detection result of the roll paper detection sensor. Because of the simple control and low cost configuration, it can be wound with the optimum frictional force according to the amount of roll paper wound, and wound loosely to cause wrinkles and breakage, The roll paper is not damaged due to excessive tension.

(Constitution)
FIG. 3 shows the configuration of the roll paper winding mechanism 1 of the second embodiment. As shown in the figure, in the roll paper winding mechanism of the second embodiment, the configuration of the roll paper winding section 4 is different from that of the first embodiment, and is arranged as a friction coefficient switching unit on a different axis that rotates as indicated by an arrow C. Two types of winding rollers 13a and 13b having different static friction coefficients are provided.

  The static friction coefficient μ of the inner winding roller 13b is higher than the static friction coefficient μ of the outer winding roller 13a.

  The winding rollers 13a and 13b are arranged at positions where the winding rollers 13a and 13b all come into contact when the roll paper 5b has a predetermined diameter d0 as indicated by a broken line. Since the other configuration is the same as that of the roll paper winding mechanism of the first embodiment, detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the second embodiment operates as follows. This operation will be described in detail below with reference to FIG.

  In the roll paper winding mechanism 1 of the second embodiment, as shown in FIG. 3A, when the diameter d of the rolled paper 5c is smaller than d0, the outermost roll paper 5z is wound with a high friction coefficient μ. It is wound only in contact with the take-up roller 13b.

  When the diameter d of the roll paper 5c is larger than d0, as shown in FIG. 3B, the outermost roll paper 5z is brought into contact with only the winding roller 13a having a lower friction coefficient μ. Taken.

  As described above, when the wound roll paper 5c is small, the mass is light as Wr1, and the maximum frictional force f between the outermost roll paper 5z and the take-up roller 13 is reduced, the roll paper having a high friction coefficient μ is used. Since winding is performed by the take-up roller 13b, a sufficient static friction force f is obtained, no slip occurs between the outermost roll paper 5z and the take-up roller 13b, and the take-up speed v2 is slightly faster than the discharge speed v1. That is, the relationship of v2≈v1 and v2> v1 can be maintained.

  On the other hand, when the wound roll paper 5c is large, the mass is heavier than Wr2, and the maximum frictional force f between the outermost roll paper 5z and the winding roller 13 is high, the winding roller 13a has a low friction coefficient μ. Therefore, the static frictional force f between the outermost roll paper 5z and the take-up roller 13a can be reduced to an appropriate static frictional force f, and the outermost roll paper 5z has an excessive tension. Therefore, it is possible to maintain the relationship that the winding speed v2 is slightly faster than the discharge speed v1, that is, the relationship of v2≈v1 and v2> v1.

  In the above description of the embodiment, two winding rollers 13a and 13b are provided. However, all the rollers come into contact with each other at the diameter φ = d0 of the wound roll paper 5c. For example, a configuration may be adopted in which only one winding roller 13b is provided at the center position, or conversely, a configuration in which more winding rollers are provided on the same axis symmetrically.

(Effect of Example 2)
As described above, according to the roll paper take-up mechanism of the second embodiment, two types of take-up rollers having different static friction coefficients are provided on different axes, and all the roll paper to be taken up has a predetermined diameter. Since the winding roller is disposed at a position where the winding roller comes into contact, the mechanical parts such as a roll paper detection sensor and an actuator for moving the winding roller are not required by simple control, and the structure of the first embodiment is reduced. The same effect can be obtained.

(Constitution)
FIG. 4 shows the configuration of the roll paper winding mechanism 1 of the third embodiment. As shown in the figure, in the roll paper take-up mechanism of the third embodiment, the configuration of the roll paper take-up unit 4 is different from the conventional one, and in the configuration of the first embodiment, the take-up roller 7 is further operated at a higher speed va1 or a lower speed vb1. In this way, the rotational speed can be changed.

  In the roll paper take-up mechanism 1 of the third embodiment, a roll paper detection sensor 11 for detecting the roll paper 5c wound up as indicated by an arrow D is disposed as the roll paper detection means, and as the rotation speed switching means. Further, a control means that can be controlled to change the rotation speed of the winding roller 7 by a stepping motor or the like is provided.

  As described above, the configuration of the roll paper winding unit 4 moves in the axial direction according to the amount of the roll paper 5c wound up by the winding rollers 7a and 7b as in the configuration of the first embodiment of FIG. It is good also as a structure to be made, and it is good also as a structure of the conventional roll paper winding part 4. FIG. Since the other configuration is the same as that of the roll paper winding mechanism of the first embodiment, detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the third embodiment operates as follows. This operation will be described in detail below with reference to FIG.

  By the way, at the start of winding, the higher the winding speed v2, the smaller the diameter of the roll paper 5c at the beginning of winding, and the smaller the diameter of the roll paper 5c wound up thereafter, Space can be saved for the roll paper winding unit 4.

  However, even if the roll paper 5c wound up exceeds a predetermined amount, if the winding speed v2 is kept high, the tension of the roll paper becomes excessive and the roll paper may be damaged. .

  In order to solve the above problem, in the roll paper winding mechanism of the third embodiment, when the roll paper detection sensor 11 determines that the roll paper 5c is less than a predetermined amount, as shown in FIG. The take-up speed v2 is set to a high speed va1 and the roll paper 5c at the beginning of winding is reduced in diameter.

  When the roll paper detection sensor 11 determines that the roll paper 5c has reached a predetermined amount or more, as shown in FIG. 4B, the winding speed v2 is set to the slow speed vb1, and the winding speed v2 is discharged. The relationship is slightly higher than the speed v1, that is, the relationship of v2≈v1 and v2> v1 is maintained, and the tension is set so as not to cause the roll paper 5c to sag.

(Effect of Example 3)
As described above, according to the roll paper take-up mechanism of the third embodiment, the control unit that changes the rotation speed of the take-up roller and the roll paper detection sensor that detects the amount of the roll paper that has been taken up are provided, and winding is started. When the amount of roll paper wound up is small, the rotation speed of the winding roller is increased. When the amount of roll paper wound up is increased, the rotation speed of the winding roller is slightly faster than the discharge speed. Since it did, in addition to the effect of Example 1, the diameter of the roll paper wound up can be made small and the space of a roll paper winding part can be made small.

(Constitution)
FIG. 5 shows a configuration of the roll paper winding mechanism 1 of the fourth embodiment. As shown in the figure, in the roll paper winding mechanism 1 of the fourth embodiment, the configuration of the winding rollers 7a and 7b of the roll paper winding section 4 is different from that of the third embodiment, and the winding roller 14 serves as a rotation speed switching means. Is a stepped shape consisting of a combination of different diameters. Other configurations are the same as the configuration of the roll paper take-up mechanism of the first embodiment, and detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the fourth embodiment operates as follows. This operation will be described in detail below with reference to FIG.

  In the roll paper winding mechanism 1 of the fourth embodiment, as in the third embodiment, at the start of winding, the roll speed is increased to reduce the diameter of the roll paper at the start of winding as follows.

  That is, when it is determined by the roll paper detection sensor 11 that the amount of roll paper 5c taken up is small as at the start of winding, the actuator 10 is moved as shown by an arrow F as shown in FIG. Then, the winding roller 14 is moved inward as indicated by an arrow A so that the winding roller 14 is brought into contact with the outermost roll paper 5z at a portion having a large diameter.

  Then, the winding roller 14 that rotates at a predetermined rotation speed contacts the outermost roll paper 5z at a large diameter portion, so that the winding speed v2 becomes high and the inner diameter of the rolled paper 5c is increased. Get smaller.

  Then, when the amount of the rolled paper 5c is increased and the rolled paper 5c is detected by the roll paper detection sensor 11, the actuator 10 is moved in the direction indicated by the arrow G as shown in FIG. The winding roller 14 is moved outward as indicated by an arrow B so that the winding roller 14 is brought into contact with the outermost roll paper 5z at a small diameter portion.

  Then, the winding roller 14 that rotates at a predetermined rotational speed comes into contact with the outermost roll paper 5z at a small diameter portion, so that the winding speed v2 becomes low, and the winding speed v2 is slightly smaller than the discharge speed v1. An early relationship, that is, a relationship of v2≈v1 and degree v2> v1, is maintained, and the tension is such that no slack occurs in the roll paper 5c.

(Effect of Example 4)
As described above, according to the roll paper take-up mechanism of the fourth embodiment, the take-up roller has a stepped shape composed of a combination of different diameters, is arranged symmetrically on the same axis, and detects the amount of the roll paper taken up. A paper detection sensor and an actuator for moving the take-up roller inward or outward in the direction of the rotation axis based on the detection result, and a portion having a large diameter when there is little roll paper taken up at the start of winding When a large amount of rolled paper is brought into contact with the roll paper, the paper is brought into contact with the roll paper at a small diameter so that the winding speed is slightly faster than the discharge speed. As in the third embodiment, the same effect as in the third embodiment can be obtained without performing complicated control to change the number of rotations of the winding roller in accordance with the amount of roll paper wound up.

(Constitution)
FIG. 6 shows the configuration of the roll paper winding mechanism 1 of the fifth embodiment. As shown in the figure, in the roll paper take-up mechanism of the fifth embodiment, the configuration of the take-up roller 15 of the roll paper take-up unit 4 is different from that of the fourth embodiment. It has a truncated cone shape with a small diameter. Other configurations are the same as the configuration of the roll paper winding mechanism of the fourth embodiment, and detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the fifth embodiment operates as follows. This operation will be described in detail below with reference to FIG.

  In the roll paper winding mechanism 1 of the fifth embodiment, as in the fourth embodiment, at the start of winding, operation is performed as follows in order to increase the winding speed and reduce the diameter of the roll paper at the start of winding.

  That is, when it is determined by the roll paper detection sensor 11 that the amount of roll paper 5c wound up as at the start of winding is small, the actuator 10 is moved as shown by an arrow F as shown in FIG. Then, the winding roller 14 is moved inward as indicated by an arrow A so that the winding roller 14 is brought into contact with the outermost roll paper 5z at a portion having a large diameter.

  Then, since the winding roller 14 that rotates at a predetermined rotation speed is in contact with the outermost roll paper 5z at the large diameter portion, the winding speed v2 becomes high, and the roll paper 5c that has been wound up The inner diameter becomes smaller.

  Then, when the amount of the rolled paper 5c is increased and the rolled paper 5c is detected by the roll paper detection sensor 11, the actuator 10 is moved in the direction indicated by the arrow G as shown in FIG. Thus, the winding roller 14 is gradually moved outward as indicated by an arrow B so that the diameter of the winding roller 14 in contact with the outermost roll paper 5z is gradually reduced.

  Then, the winding roller 14 that rotates at a predetermined rotational speed gradually comes into contact with the outermost roll paper 5z at a small diameter portion, so that the winding speed v2 gradually decreases and the winding is performed. The relationship that the speed v2 is slightly faster than the discharge speed v1, that is, the relationship of v2≈v1 and v2> v1 can be maintained, and the tension can be gradually increased to such an extent that no sag occurs in the roll paper 5c.

  In the above description of the embodiment, the winding roller 15 has been described as a truncated cone shape whose diameter decreases toward the inner side. However, as shown in FIG. It is good also as a shape.

(Effect of Example 5)
As described above, according to the roll paper take-up mechanism of the fifth embodiment, the roll paper detection sensor for detecting the amount of roll paper taken up, and the take-up roller on the inner or outer side in the rotation axis direction based on the detection result. If the winding roller is concentrically arranged on the same axis and symmetrically arranged so that the diameter decreases toward the inner side, and when it is detected that there is little roll paper taken up at the start of winding, the winding roller When the roll paper is in contact with the roll paper at the part where the diameter of the take-up roller is large and it is determined that the roll paper is wound up, the roll paper is brought into contact with the roll paper at the part where the diameter of the take-up roller is small. Is gradually increased to a relationship that is slightly faster than the discharge speed. In addition to the effects of the fourth embodiment, the winding speed can be gradually changed to suppress the occurrence of sagging with high accuracy.

(Constitution)
FIG. 7 shows the configuration of the roll paper winding mechanism 1 of the sixth embodiment. As shown in the figure, in the roll paper winding mechanism of the sixth embodiment, the configuration of the winding roller 15 of the roll paper winding section 4 is different from that of the fifth embodiment, and the roll paper detection sensor 11 is provided as a rotation speed switching means. Instead, an actuator 10 as a driving means for driving the take-up roller 15 in the axial direction and a spring 16 for biasing inward are provided instead of the link portion 10a. Other configurations are the same as the configuration of the roll paper winding mechanism of the fourth embodiment, and detailed description thereof is omitted for the sake of brevity.

(Operation)
With the above configuration, the roll paper winding mechanism 1 according to the sixth embodiment operates as follows. This operation will be described in detail below with reference to FIG.

  Since the surface of the winding roller 15 is inclined, the axial component of the weight of the roll paper 5c acts in the axial direction, and the position of the winding roller 15 is determined so that this force and the elastic force of the spring are balanced. The

  That is, when the amount of the rolled paper 5c is small as at the start of winding, the winding roller 15 is gradually moved inward as shown by an arrow A as shown in FIG. The roll paper 5c is wound around the roller 15 having a large diameter, the winding speed v2 is increased, and the inner diameter of the rolled paper 5c is reduced.

  As the amount of roll paper 5c taken up increases, the gravity that the take-up roller 15 receives from the roll paper 5c increases, and the axial component also increases due to the inclination of the take-up roller 15, and the take-up roller 15 15 gradually moves outward as indicated by arrow B.

  Due to this outward movement, the contact position between the outermost roll paper 5z and the take-up roller 15 moves while gradually sliding in the direction of smaller diameter, and the rotation speed of the take-up roller 15 is constant. v2 gradually decreases, and the winding speed v2 is slightly faster than the discharge speed v1, that is, the relationship of v2≈v1 and v2> v1 is maintained, and the tension is gradually increased to such a degree that no sag occurs in the roll paper 5c. Can do.

(Effect of Example 6)
As described above, according to the roll paper take-up mechanism of the sixth embodiment, the take-up roller has a truncated cone shape whose diameter decreases toward the inner side, is arranged symmetrically on the same axis, and the spring biases the take-up roller inward. Thus, in addition to the effects of the fifth embodiment, there is no need to provide a roll paper detection sensor, an actuator, and a link portion, and a more inexpensive configuration can be achieved.

<< Other modifications >>
In the roll paper winding mechanisms of the first, third, fourth, and fifth embodiments, a roll paper detection sensor 11 is provided as a roll paper detection unit to detect the diameter of the roll paper 5c, and the detection is performed. Although it has been described that the amount of the roll paper 5c is determined based on the result, the roll paper detection unit is not provided, and when the roll paper 5b is discharged from the processing unit 2, the number of times of discharge is counted and the processing is performed once. The accumulated discharge length is calculated by the product of the length of the roll paper 5b discharged and the amount of the roll paper 5c wound up is estimated, and the amount of the roll paper 5c is determined based on the estimated value. May be.

  As described above, the present invention can be widely used in a journal recording apparatus that includes a roll paper winding mechanism, performs a process such as printing on a roll-shaped medium, and winds and stores the medium.

DESCRIPTION OF SYMBOLS 1 Roll paper winding mechanism 2 Processing part 3 Roll paper discharge part 4, 104 Roll paper winding part 5 Roll paper supply part 5a Roll paper 5b Discharged roll paper 5c Rolled roll paper 6 Discharge roller 7, 7a, 7b, 13a, 13b, 14, 15, 15x, 107 Winding roller 10 Actuator 10a Link portion 11 Roll paper detection sensor 16 Spring v1 Discharge speed v2 Winding speed f Maximum friction force μ Static friction coefficient N Vertical drag Wr Mass

Claims (10)

A roll paper supply unit for feeding out the roll paper, a processing unit for performing a predetermined process on the fed roll paper, a roll paper discharge unit for discharging the processed roll paper at a predetermined discharge speed, and the discharged roll paper A roll paper take-up mechanism comprising a roll paper take-up portion that winds up by a take-up roller that is supported by rotating shafts arranged in parallel,
A roll paper winding mechanism comprising a friction coefficient switching means for switching the frictional force of the winding roller according to the amount of roll paper wound by the winding roller. The friction coefficient switching means is configured such that the winding roller is composed of an inner winding roller pair having a low static friction coefficient and an outer winding roller pair having a high static friction coefficient that are arranged symmetrically on the same axis.
Roll paper detection means for detecting the amount of roll paper wound, and drive means for moving the winding roller inward and outward in the direction of the rotation axis,
When it is detected that the amount of rolled paper is small, the outer winding roller pair is brought into contact with the rolled paper, and when it is detected that the amount of rolled paper is large, 2. The roll paper winding mechanism according to claim 1, wherein an inner winding roller pair is brought into contact with the wound roll paper.   The friction coefficient switching means includes a plurality of types of winding rollers having different static friction coefficients supported by different rotating shafts, and a winding roller having a high static friction coefficient when the rolled paper is not more than a predetermined diameter. The wound roll paper is brought into contact with the roll paper, and when the wound roll paper has a predetermined diameter, the rolled paper is brought into contact with all the winding rollers and wound up. 2. The roll paper winding mechanism according to claim 1, wherein when the roll paper becomes larger than a predetermined diameter, the roll paper wound is placed in contact with a winding roller having a low static friction coefficient. . A roll paper supply unit for feeding out the roll paper, a processing unit for performing a predetermined process on the fed roll paper, a roll paper discharge unit for discharging the processed roll paper at a predetermined discharge speed, and the discharged roll paper A roll paper take-up mechanism comprising a roll paper take-up portion that winds up by a take-up roller that is supported by rotating shafts arranged in parallel,
A roll paper take-up mechanism comprising a rotation speed switching means for switching the rotation speed of the take-up roller in accordance with the amount of roll paper taken up by the take-up roller. The rotation speed switching means includes control means for changing the rotation speed of the take-up roller, and roll paper detection means for detecting the amount of roll paper taken up.
When it is detected that the amount of rolled paper is small, the rotational speed of the winding roller is made faster than the discharge speed, and when it is detected that the amount of rolled paper is large, the winding roller 5. The roll paper take-up mechanism according to claim 4, wherein the rotational speed is slowed to a degree faster than the discharge speed in the vicinity of the discharge speed. The rotational speed switching means has a stepped shape composed of a combination of different diameters, and is arranged symmetrically on the same axis.
Roll paper detection means for detecting the amount of roll paper wound, and drive means for moving the winding roller inward or outward in the rotational axis direction based on the detection result,
When it is detected that the amount of rolled paper is small, it is brought into contact with the roll paper at a portion having a large diameter of the winding roller, and when it is detected that the amount of rolled paper is large, the winding is performed. 5. The roll roller is brought into contact with the roll paper at a small diameter portion of the take-up roller, and the rotation speed of the take-up roller is made slower than the discharge speed in the vicinity of the discharge speed. Roll paper winding mechanism.   The roll paper winding mechanism according to claim 6, wherein the rotation speed switching unit has a circular truncated cone shape in which the diameter of the winding roller decreases toward the inner side, and is arranged symmetrically on the same axis.   The rotation speed switching means is characterized in that the winding roller has a truncated cone shape whose diameter decreases toward the inner side, is arranged symmetrically on the same axis, and is provided with a spring that biases the winding roller in the inner direction. The roll paper winding mechanism according to claim 4.   The roll paper winding mechanism according to claim 2, 5, 6, or 7, wherein the roll paper detecting means comprises a light emitting element and a light receiving element facing each other. The roll paper detecting means counts the number of discharges when discharging the roll paper, and calculates the discharge length by the product of the number of discharges and the length of the roll paper discharged in one process,
The roll paper winding mechanism according to claim 2, 5, 6, or 7, wherein the amount of roll paper wound up is calculated from the calculated discharge length.

Images