JP3959329B2 - Roller device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roller device that is incorporated in a medium conveying device that conveys and processes workpieces such as mail, bills, and cards, for example, and drives or brakes the workpiece.
[0002]
[Prior art]
A roller device is used to mitigate the impact of the paper sheet in the direction changing section for detecting the paper sheet (work) conveyed at a high speed in the paper sheet processing machine and changing it to a predetermined direction. It has been. For example, as shown in FIG. 9, the direction changing roller 100 and the pinch roller (roller device) 110 are arranged to face each other, the pinch roller 110 is swingably provided on the support shaft 111, and is directional by a spring biasing force. It is pressed against the outer peripheral surface of the conversion roller 100 (see, for example, Patent Document 1).
[0003]
[Problems to be solved by the invention]
The roller device described above has the following problems. That is, in the paper sheet processing machine, the thickness and weight vary depending on the paper sheet to be handled, and these paper sheets are conveyed at a speed of 3 to 4 [m / s]. When the leaves enter, the pinch roller 110 may be impacted and jump up, and it may not be possible to appropriately apply an action force for changing the direction of the paper sheets. For this reason, it is necessary to reduce the conveyance speed, and there is a problem that the processing efficiency decreases.
[0004]
The configuration using the spring biasing force is not enough to prevent the roller from jumping up, and measures such as providing a separate shock absorber or a buffer structure using a magnetic damper are costly and require space. There was a problem that.
[0005]
As a roller device incorporating a shock absorber, a platen roller (see, for example, Patent Document 2) that reduces printing noise and improves printing quality of a dot impact type printer is disclosed. The platen roller has a configuration in which a vibration absorbing member such as a resin or a fiber material is filled therein, and particles such as metal or ore are distributed inside the vibration absorbing member. However, the main purpose is to obtain a sound absorbing effect, in which particles are distributed in the vibration absorbing member in order to extract the sound absorbing effect at various frequency components, and the platen roller is used to reduce the impact of a paper sheet processing machine, etc. It has been difficult to use as a roller device for use. The vibration absorbing member is simply filled in the platen.
[0006]
Therefore, the present invention can efficiently absorb the impact even when a workpiece such as a paper sheet enters at a high speed to prevent the roller from jumping up or double feeding of the paper sheet, An object of the present invention is to provide a roller device that can apply a constant pressing force corresponding to the thickness of the roller and that does not take up space.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-232847 (page 6)
[0008]
[Patent Document 2]
JP-A-6-1207048 (page 3)
[0009]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the roller device of the present invention is configured as follows.
[0010]
(1) In a roller device that drives or brakes by bringing its outer peripheral surface into contact with a workpiece, a rotating shaft and a cylindrical shape that is disposed around the rotating shaft as a central axis and whose outer peripheral surface is in contact with the workpiece. A friction member, an impact absorbing member that is disposed on the rotating shaft side of the friction member and absorbs an impact received by the friction member from the workpiece by its own deformation, and on the rotating shaft side of the impact absorbing member. Arranged and attached integrally to the rotating shaft, and provided between a rotating member-like shaft holder member that regulates the deformation direction of the shock absorbing member , the friction member, and the shock absorbing member, And a holding member for restricting the deformation direction of the absorbing member .
[0011]
( 2 ) In the roller device described in the above ( 1 ), the deformation direction of the shock absorbing member by the holding member is regulated in the radial direction of the rotating shaft.
[0013]
( 3 ) The roller device according to (1), wherein the rotating shaft is biased toward the workpiece.
[0014]
( 4 ) The roller device according to (1), wherein the impact absorbing member is divided along a circumferential direction.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing a medium transport mechanism 10 in which a roller device 30 according to a first embodiment of the present invention is incorporated, and FIG. 2 is a side view of the medium transport mechanism 10. The medium transport mechanism 10 applies an appropriate driving force to the paper sheet W that enters between the roller device 30 and the driving roller 40 from the transport direction Q in accordance with the thickness variation of the paper sheet W. It is a mechanism for granting. The medium transport mechanism 10 is provided, for example, in a direction changing unit or a letter interval correcting unit of a mail processing machine, and by reducing the force at the time of entering a paper sheet W having a different thickness. When the predetermined driving force is applied or the braking is applied, the acting force is appropriately transmitted.
[0016]
The medium transport mechanism 10 has a U-shaped roller fixing part 11 attached to the apparatus main body 1 and a U-shaped roller moving part attached to the roller fixing part 11 via a swing shaft 12. 13, a roller mechanism 20 attached to the roller moving unit 13 via a rotation shaft 21 to be described later, and a drive side roller 40 disposed to face the roller mechanism 20.
[0017]
The roller fixing portion 11 is provided with a groove portion 11a through which a roller swing stopper 13a described later can reciprocate. Further, the roller moving portion 13 reciprocates along the groove portion 11a, and roller swing stoppers 13a and 13a for restricting the swing range of the roller move portion 13 and a bearing portion for rotatably supporting the rotating shaft 21. 13b, 13b and notches 13c, 13c are provided. A pressing force torsion spring 12 a is attached to the swing shaft 12 and biases the swing shaft 12 in the S direction in FIG. 2.
[0018]
The roller mechanism 20 is provided between the rotating shafts 21 and 21 attached to the bearing portions 13b and 13b, a pair of roller devices 30 and 30 arranged in parallel along the rotating shaft direction, and the roller devices 30 and 30, respectively. The shaft 22 is provided. The rotating shafts 21 and 21 are attached to the notches 13c and 13c by bolts 21a and 21a.
[0019]
The roller device 30 includes shaft holder members 31 and 32 provided between the rotary shaft 21 and the shaft 22, shock absorbing members 33 and 34 provided on the outer peripheral portions of the shaft holder members 31 and 32, and these shock absorbing members. An annular holding member 35 having a T-shaped cross section provided around the members 33 and 34 and a cylindrical conveying friction member 36 attached around the holding member 35 are provided.
[0020]
The shock absorbing members 33 and 34 are made of, for example, rubber, gel, sponge material or the like having excellent shock absorbing performance. As a specific example of the gel, a styrene-based elastomer manufactured by Kitagawa Kogyo Co., Ltd. is applied. Since this styrene elastomer is silicon free, it has the property that no electrical contact failure occurs.
[0021]
As a specific example of sponge, INOAX Corporation's industrial foam NR rubber sponge-natural rubber system is applied. The NR rubber sponge-natural rubber system is structurally polyisoprene, has an appropriate cushioning property, and is used as a cushioning material.
[0022]
On the other hand, the holding member 35 is made of plastic, resin, metal, or the like, and is made of a material having sufficiently high rigidity. The conveying friction member 36 is formed of a rubber material or the like corresponding to the material of the paper sheet W or the like.
[0023]
3A to 3C show examples of arrangement of the impact absorbing members 33 and 34. FIG. The shock absorbing members 33 and 34 can be fixed without using an adhesive if a part thereof is engaged with a groove or the like provided in the holding member 35. The shock absorbing members 33 and 34 may be disposed on the entire circumference of the roller as shown in FIG. 3A, or partially as shown in FIGS. 3B and 3C. A gap may be provided and arranged on a part of the circumference.
[0024]
Further, although the shock absorbing members 33 and 34 are arranged point-symmetrically on the circumference of the roller, they are not necessarily arranged point-symmetrically. Depending on the material of the shock absorbing members 33 and 34, the shock absorbing performance may be improved by arranging them separately. The shock absorbing members 33 and 34 are arranged on both the front and back surfaces of the holding member 35, but the left and right sides may be line symmetric or the phases may be shifted.
[0025]
4A and 4B show only the roller device 30 taken out. The conveying friction member 36 has a ring shape and can be fitted into the outer peripheral surface of the holding member 35. In addition, the holding member 35 supports the shape of the conveying friction member 36 and suppresses excessive deformation of the friction member 36. The holding member 35 is provided with gaps 31a and 32a and a gap 37 so that the holding member 35 can move with the shaft holder members 31 and 32 as guides, and the deformation direction of the shock absorbing members 33 and 34 is defined. ing.
[0026]
In the transport roller mechanism 10 configured as described above, the paper sheet W is transported as follows. That is, as the paper sheet W advances in the direction of the arrow Q in the figure, it contacts the conveying friction member 36. The conveying friction member 36 receives an impact force from the paper sheet W. At this time, since the holding member 35 is inserted, the conveying friction member 36 is not greatly deformed. This impact force is transmitted to the impact absorbing members 33 and 34 via the holding member 35. The impact absorbing members 33 and 34 absorb the impact by their own deformation. At this time, since the shock absorbing members 33 and 34 are sandwiched between the holding member 35 and the shaft holder members 31 and 32, the deformation directions of the shock absorbing members 33 and 34 are restricted so as to be uniquely determined. Excessive partial deformation does not occur, and the life of the shock absorbing members 33 and 34 can be extended.
[0027]
As described above, according to the medium transport mechanism 10 according to the first embodiment, the roller device 30 uses the transport friction member 36 conventionally used as the transport friction member. The conventional effects can be maintained with respect to the frictional relationship with the paper sheet W and the life due to wear. Further, the impact given by the paper sheet W to the roller device 30 can be absorbed by the impact absorbing members 33 and 34 disposed inside the roller.
[0028]
In addition, since the distance between the part that receives the impact force and the part that absorbs the impact force is close, for example, the response speed is faster and the impact can be efficiently performed compared to when a shock absorber or damper is attached to the support member that supports the rotating shaft. Can be relaxed. Here, the effect of reducing the impact force depending on the mounting position of the shock absorbing member will be compared. When there is no shock absorbing member, the impact force is "S", and when there is "S", the impact force mitigating effect is "Shock Absorption Rate" (the higher the value, the greater the mitigating effect) is: 1).
[0029]
Impact absorption rate [%] = (1−S present / S absent) × 100 (1)
At this time, when the shock absorbing member is used at a position away from the roller device, the shock absorbing rate is about 35%, and when the shock absorbing member is used in a system almost equivalent to the built-in roller, the shock absorbing rate is about 35%. Was about 75%. Therefore, it can be seen that by installing the shock absorbing material inside the roller, the shock absorption rate can be effectively increased by bringing the shock absorbing member closer to the shock generating source.
[0030]
On the other hand, for example, when the thicknesses of the paper sheets W are different from each other, it is necessary to appropriately change the gap between the roller device 30 and the driving roller 40. As described above, the roller swing stopper 13a mounted on the roller moving portion 13 travels in the groove 11a around the swing shaft 12 supported by the roller fixing portion 11. For this reason, the roller moving unit 13 swings, and the pair of roller devices 30 and 30 operate so as to move away from the driving roller 40 in conjunction with each other. At this time, a constant pressing force is applied to the paper sheet W by using the pressing force torsion spring 12a, and the roller device 30 is quickly pushed back toward the driving roller 40 after passing through the paper sheet W, It is possible to appropriately cope with the paper sheet W.
[0031]
In this way, by absorbing the impact of the paper sheet W, the roller device 30 can be prevented from jumping up, and the roller-side moving unit 13 can be swung to correspond to the thickness of the paper sheet W. Since the gap between the roller device 30 and the roller device 30 is opened, and a constant pressing force is applied, the driving force and the braking force to the paper sheet W are reliably transmitted, and the speed of the paper sheet W Position control becomes easy.
[0032]
Furthermore, the roller moving part 13 supports the rotating shaft 21 via the bearing parts 13b and 13b, and the roller moving part 13 is provided with a notch 13c so that the rotating shaft 21 can be easily removed. The notch portion 13c is larger than the diameter of the rotating shaft 21, and has a size that prevents the bearing portions 13b and 13b from falling off. Accordingly, when the bolts 21a and 21a shown in FIG. 1 are removed, the bearing portions 13b and 13b are detached, and the roller device 30 can be taken out together with the rotating shaft 21, so that the attachment and detachment is easy and the maintenance is excellent.
[0033]
If the roller moving unit 13 and the roller fixing unit 11 are supported by the shaft 22 instead of the rotating shaft 21, the transfer friction member 36 can be replaced more easily, and the maintainability is excellent.
[0034]
As described above, according to the medium conveyance device 10 in which the roller device 30 according to the first embodiment is incorporated, the durability and friction coefficient of the conventional roller are not changed, and the size of the entire device is increased. Therefore, it is possible to effectively relieve the impact caused by the collision of the paper sheet W and prevent the roller device 30 from jumping up. Further, by applying an appropriate pressing force to the paper sheet W, it becomes possible to cause the driving force and the braking force to act reliably.
[0035]
FIG. 5 is a cross-sectional view showing a medium transport mechanism 10A in which a roller device 30A according to a second embodiment of the present invention is incorporated. In FIG. 5, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0036]
The roller device 30A of the roller mechanism 20A incorporated in the medium transport mechanism 10A is not provided with the holding member 35. When the impact force received from the paper sheet W is weak, the impact absorbing members 33 and 34 are not significantly deformed even if the holding member 35 is omitted, and therefore the roller device 30 according to the first embodiment. The same effect can be obtained.
[0037]
FIG. 6 is a cross-sectional view showing a medium transport mechanism 10B in which a roller device 30B according to a third embodiment of the present invention is incorporated. In FIG. 6, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0038]
The two roller devices 30 and 30 of the medium conveyance mechanism 10 described above operate in conjunction with each other, whereas the roller devices 30B and 30B of the roller mechanism 20B incorporated in the medium conveyance mechanism 10B rotate independently of each other. It is. In FIG. 6, reference numeral 13B denotes a roller moving unit. When the two roller devices 30B are driven independently, the same effect as the roller device 30 can be obtained, and the skew can be suppressed when there is a difference in thickness within the same paper sheet W.
[0039]
FIG. 7 is a cross-sectional view showing a medium transport mechanism 10C in which a roller device 30C according to a fourth embodiment of the present invention is incorporated. In FIG. 7, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0040]
Instead of supporting the rotating shaft 21 by the bearing portions 13b, 13b, the rotating shaft 23 is supported by incorporating the bearing portion 24 into the roller device 30C. In this case, the same effect as the roller device 30 can be obtained, and the overall size can be reduced.
[0041]
FIG. 8 is a cross-sectional view showing a medium transport mechanism 10D in which a roller device 30D according to a fifth embodiment of the present invention is incorporated. In FIG. 8, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0042]
In FIG. 8, 13D indicates a roller moving portion, and 25 indicates a rotating shaft. In this case, it is possible to obtain the same effect as the roller device 30C and to suppress the skew when there is a difference in thickness within the same paper sheet W.
[0043]
The present invention is not limited to the above embodiment. In the above-described example, the object is a paper sheet, but is not limited to the paper sheet, and may be another conveyed object. Further, the roller device can be applied not only to the conveyance processing device but also to a wheel or the like. Of course, various modifications can be made without departing from the scope of the present invention.
[0044]
【The invention's effect】
According to the present invention, even when a workpiece such as a paper sheet is rushed at a high speed, the impact is efficiently absorbed to prevent the roller from jumping up or double feeding of the paper sheet. A certain pressing force can be applied according to the thickness of the kind.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a medium transport mechanism in which a roller device according to a first embodiment of the present invention is incorporated.
FIG. 2 is a side view showing the medium transport mechanism.
FIG. 3 is an explanatory view showing a roller mechanism incorporated in the medium transport mechanism.
FIG. 4 is a view showing a roller mechanism incorporated in the medium transport mechanism.
FIG. 5 is a cross-sectional view showing a medium transport mechanism in which the roller device according to the first embodiment of the present invention is incorporated.
FIG. 6 is a cross-sectional view showing a medium transport mechanism in which a roller device according to a second embodiment of the present invention is incorporated.
FIG. 7 is a cross-sectional view showing a medium transport mechanism in which a roller device according to a third embodiment of the present invention is incorporated.
FIG. 8 is a cross-sectional view showing a medium transport mechanism in which a roller device according to a fourth embodiment of the present invention is incorporated.
FIG. 9 is an explanatory diagram showing an example of a conventional medium transport mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Medium conveyance mechanism 11 ... Roller fixing part 12 ... Oscillating shaft 13 ... Roller moving part 20 ... Roller mechanism 30 ... Roller apparatus 31, 32 ... Shaft holder members 33, 34 ... Shock absorbing member 35 ... Holding member 36 ... Conveyance Friction member 40 for driving side roller

Claims (4)

In the roller device that drives or brakes by contacting the outer peripheral surface of the workpiece,
A rotation axis;
A cylindrical friction member that is arranged with the rotation axis as a central axis and whose outer peripheral surface is in contact with the workpiece;
An impact absorbing member that is arranged on the rotating shaft side of the friction member and absorbs the impact received by the friction member from the workpiece by its own deformation;
A rotating body-shaped shaft holder member that is disposed on the rotating shaft side of the shock absorbing member, is integrally attached to the rotating shaft, and restricts the deformation direction of the shock absorbing member ;
A roller device comprising a holding member that is provided between the friction member and the shock absorbing member and restricts a deformation direction of the shock absorbing member . The roller device according to claim 1 , wherein the restriction of the deformation direction of the shock absorbing member by the holding member is a radial direction of the rotating shaft.   The roller device according to claim 1, wherein the rotation shaft is biased toward the workpiece. The impact absorbing member, b over La apparatus according to claim 1, characterized in that it is divided along the circumferential direction.

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