JP2001220041A - Tension applying device of recording body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a constant tension at all times irrespective of a diameter of a roll. SOLUTION: The roll 16 for a mimeograph stencil paper 1 is rotatably supported. The rotation of the roll 16 is transmitted to a first damper gear 30 through an output gear 26 to rotate a rotary plate on one side in a silicone damper 60. The rotary plate on one side receives resistance of silicon oil to give load to the rotation of the roll 16. On the other hand, the rotation of the roll 16 is transmitted to a second damper gear 31 through the output gear 26, a second interlocking gear 36, a first interlocking gear 34, an annular gear 33, and each planetary gear 32 to rotate a rotary plate on the other side in the silicone damper 60. The rotary plate on the other side opposes to the rotary plate on one side through silicone oil. Moreover, the rotary plate on the other side rotates in the same direction as the rotary plate on one side. Consequently, when a diameter of the roll 16 becomes small and rotation speed of the output gear 26 is increased, an increase of a load due to an increase of rotation speed of the rotary plate on one side is suppressed by the rotation of the rotary plate on the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus capable of applying a constant tension to a drawn recording medium regardless of the diameter of the roll when the recording medium such as a stencil sheet wound in a roll is pulled out. The present invention relates to a body tension applying device.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional plate-making printing apparatus. The roll-shaped stencil sheet 1 is held by a master holder. Stencil 1 drawn from roll stencil 1
Is a continuous band. The stencil sheet 1 is wrapped around a set guide shaft 100 to change the direction, is sandwiched between a thermal head 101 and a platen roller 102, is further wrapped around a wrapping roller 103, and then between the upper and lower load rollers 104 and 105. And transported to the initial stop position.

When the stencil sheet 1 is conveyed, the back tension unit 107 provided on the master holder moves the stencil sheet 1 in the conveying direction so that wrinkles do not occur in a portion sandwiched between the thermal head 101 and the platen roller 102. And tension in the opposite direction.

When the thermal head 101 perforates the stencil sheet 1 by heat, the power for transporting the stencil sheet 1 is given only by the platen roller 102 which holds the stencil sheet 1 with the thermal head 101. Can be The perforated stencil sheet 1 is guided downward by the winding roller 103 and advances into the storage box 108. Thermal head 10
The perforated stencil sheet 1 is stored in the storage box 108 until the perforation by 1 is completed.

After the stencil making is completed, the thermal head 101 moves upward to release the stencil sheet 1 held together with the platen roller 102. The leading end of the stencil sheet 1 having been made is conveyed to the clamp plate 110 of the printing drum 109 by the upper and lower load rollers 104 and 105. The leading end of the stencil sheet 1 is clamped by the clamp plate 110 to the printing drum 1.
09. As the printing drum 109 rotates, the upper and lower load rollers 104 and 105 rotate to convey the stencil sheet 1 and wind the stencil sheet 1 around the peripheral surface of the printing drum 109. When the printing is completed, the stencil sheet 1 is cut by the cutter unit 111.

This stencil printing machine also has the function of a stencil printing machine. A part of the configuration as the stencil printing apparatus is not shown. Part of the peripheral wall of the printing drum 109 is ink-permeable. Inside the printing drum 109, there is an ink supply means for supplying ink to the inner surface of the peripheral wall. Printing drum 10
Below 9 is a pressing means for pressing the printing paper against the printing drum 109. While rotating the printing drum 109, the printing paper is sent between the printing drum 109 and the pressing means at a predetermined timing, and the printing paper is pressed against the image portion of the stencil sheet 1 mounted on the printing drum 109. The printing ink supplied from the inner peripheral wall of the printing drum 109 passes through the peripheral wall of the printing drum 109 and transfers from the perforated portion of the stencil sheet 1 to the printing paper to form an image.

[0007]

In the conventional plate making apparatus shown in FIG. 6, the back tension unit 107 is
A load is applied to the rotation of the core of the roll-shaped stencil paper,
This gives back tension to the stencil paper. However, the conventional mechanism has a problem that the back tension changes depending on the diameter of the stencil sheet. That is, since the feed amount of the stencil sheet is constant, when the roll diameter is large, the rotation speed is low, and the load by the back tension unit 107 is small. However, as the roll diameter decreases, the rotation speed increases, and the load on the back tension unit 107 increases.

[0008] When the back tension is weak, stencil papermaking wrinkles are generated. Also, if the back tension is strong, image shrinkage will occur. This is because if the back tension is high, the speed at which the stencil paper passes through the thermal head becomes slow, and as a result, the interval between perforations formed in the stencil paper is reduced in the feed direction. That is, although the writing timing of the thermal head is the same, the feed speed of the stencil sheet is slow, so that the interval between the perforations to be formed in the stencil sheet feed direction becomes narrow.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a recording-medium tension applying apparatus capable of always applying a constant tension regardless of the roll diameter when a roll-shaped recording medium is fed. The purpose is to provide.

[0010]

According to the present invention, there is provided a recording medium tension applying apparatus according to the present invention, wherein a belt-shaped recording medium drawn from a roll of a rotatably supported recording medium is provided. A load applying means for applying a load, which increases in proportion to the rotation speed of the roll, to the rotation of the roll, and the loading means increasing the rotation speed of the roll. And a load transmitting means for transmitting the rotation of the roll to the load means and the load suppressing means.

According to a second aspect of the present invention, in the tension applying device for a recording medium according to the first aspect, the load means includes an output gear that rotates together with the roll.
It has one rotating plate that rotates by receiving the resistance of the viscous body, the load suppressing means has the other rotating plate facing the one rotating plate and the viscous body, and the rotation transmitting means And a gear group for transmitting rotation in the same direction as the one gear to the other rotary plate via the output gear.

[0012]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a side sectional view of a plate making and printing apparatus employing the tension applying device of the present invention, FIG. 2 is an enlarged view of the tension applying device in FIG. 1, FIG. 3 is a front view of the tension applying device, and FIG. FIG. 2 is an exploded view of the device.

The stencil printing apparatus according to the present embodiment has both a stencil making function for thermally perforating a stencil sheet 1 as a recording medium and a printing function for performing stencil printing on printing paper using the stencil sheet 1 made as a recording medium. ing. The stencil sheet 1 as a recording body is a sheet body bonded to a heat-sensitive film and a porous support.

As shown in FIG. 1, a printing drum 3 is provided inside a main body frame 2 of the plate making and printing apparatus. Printing drum 3
Is a substantially cylindrical peripheral wall 4 that is at least partially permeable to ink, a clamp plate 5 as fixing means provided on the outer peripheral surface of the peripheral wall 4, and an inner peripheral surface of the peripheral wall 4 provided inside the peripheral wall 4. An ink supply unit (not shown) for supplying ink to the surface is provided. The printing drum 3 is driven to rotate about a rotation axis parallel to its own central axis 6 installed at a predetermined position. Below the printing drum 3, printing paper is placed on the printing drum 3.
There is a pressing means (not shown) for pressing the pressing means.

A master holder 7 is provided inside the main body frame 2.
Is provided. The master holder 7 rotatably accommodates the stencil sheet 1 wound in a roll shape. Stencil sheet 1
Is a sheet in which a heat-sensitive film and a porous support are laminated. Further, as described later, the master holder 7 is provided with a tension applying device for applying a predetermined tension to the stencil sheet 1.

A set guide shaft 8, a platen roller 9, a thermal head 10, a winding roller 11, upper and lower load rollers 12, 13 and a cutter unit 14 are arranged between the master holder 7 and the printing drum 3 from the side of the master holder 7. Each is arranged side by side. Stencil sheet 1
Is conveyed through these rolls and the like, and is perforated by the thermal head 10. Inside the main body frame 2, below the platen roller 9 and the thermal head 10, there is provided a storage box 15 for storing one plate of the stencil sheet 1 made.

The thermal head 10 is in the shape of a long and narrow strip, is set in parallel with the width direction of the stencil sheet 1 to be conveyed, and is in contact with the upper surface of the stencil sheet 1. Also thermal head 1
Reference numeral 0 can be moved in a direction approaching or separating from the platen roller 9 by a drive mechanism (not shown). The thermal head 10 presses against the platen roller 9 when the stencil sheet 1 is perforated, and separates from the platen roller 9 after the perforation is completed.
The thermal head 10 includes a plurality of heating elements arranged in parallel with the width direction of the stencil sheet 1, and heat-holes the heat-sensitive film of the stencil sheet 1 by heat.

The platen roller 9 includes a thermal head 10
And is provided in the main body frame 2 and is rotationally driven in the direction of the printing drum 3 (clockwise in FIG. 1) by a driving mechanism described later. During plate making, the platen roller 9 and the thermal head 10 come into contact with each other. As a result, the stencil sheet 1 is sandwiched between the platen roller 9 and the thermal head 10. The stencil sheet 1 is heated by the thermal head 10 while being conveyed to the platen roller 9, and is perforated.

The take-up roller 11 is used for the thermal head 1.
By 0, the course of the stencil sheet 1 during stencil making is bent downward.
The perforated stencil sheet 1 whose path has been bent by the winding roller 11 is stored in a storage box 15 until a series of perforating operations is completed.
Housed within.

The upper and lower load rollers 12 and 13 feed the leading edge of the stencil sheet 1 having been made into the clamp plate 5 of the printing drum 3. The leading end of the stencil sheet 1 is fixed to the printing drum 3 by a clamp plate 5. And the upper and lower road rollers 1
The stencil sheet 1 is conveyed by rotation of the stencil sheets 2 and 13, and the printing drum 3 is rotated and the stencil sheet 1 is wound around the peripheral surface of the printing drum 3 to perform stencil printing. When the printing is completed, the stencil sheet S is cut by the cutter unit 14.

Thereafter, the printing drum 3 rotates, and printing paper is fed between the printing drum 3 and the pressing means at a predetermined timing. The pressing means presses the printing paper against the image portion of the stencil sheet S mounted on the printing drum 3, and the printing drum 3
The printing ink supplied from the inner peripheral wall passes through the peripheral wall 4 of the printing drum 3 and transfers from the perforated portion of the stencil sheet S to the printing paper. Then, a stencil image is formed on the printing paper,
That is, printing is performed.

In such a stencil printing machine, as shown on the left side of FIG. 1, the master holder 7 is provided with a tension applying device. Hereinafter, the tension applying device will be described. As shown in FIGS. 2 and 3 in an enlarged manner, a support flange 21 is attached to an end of the roll 16 of the stencil sheet 1. At the center of the support flange 21, a cylindrical core portion 22 that is inserted into a hole in the end face of the roll 16 is provided and penetrates.

The master holder 7 has a pair of side plates 23 provided at a predetermined interval. A rotation shaft 24 is rotatably provided on the side plate 23. This rotating shaft 24
The roll 16 of the stencil sheet 1 is pivotally supported at the inner end of the stencil.
Specifically, the support flange 21 is attached to the inner end of the rotating shaft 24.
A fitting plate 25 that fits into the hole 22a of the core portion 22 is inserted. The fitting plate 25 is provided with the fitting groove 21 of the support flange 21.
It has a fitting projection 25a that fits into a. Then, by the fitting of the fitting groove 21a and the fitting protrusion 25a,
The support flange 21 to which the roll 16 of the stencil sheet 1 is attached and the fitting plate 25 rotate together with respect to the rotating shaft 24.

An output gear 26 is fixed to the rotating shaft 24. The output gear 26 is provided with a plurality of fixing pins 27 that are inserted into the fitting plate 25. That is, the fitting plate 25
And the output gear 26 are connected to each other via a fixing pin 27. As a result, the output gear 26 fixed to the rotating shaft 24 and the fitting plate 25 inserted through the rotating shaft 24 rotate together, and the roll 16 of the stencil sheet 1 on the support flange 21 rotates via the fitting plate 25. I do.

A compression coil spring 28 is interposed between the fitting plate 25 and the output gear 26. The compression coil spring 28 includes an output gear 26 fixed to the rotating shaft 24.
Acts to separate the fitting plate 25 to obtain a sufficient fitting state between the fitting plate 25 and the support flange 21. The other side plate 23 that is paired with the side plate 23 shown in FIG. 3 is configured to support a support flange 21 to which the roll 16 of the stencil sheet 1 is attached, coaxially with the rotation shaft 24. (Not shown).

As shown in FIGS. 2 to 4, a silicon damper 60 as a load means is meshed with the output gear 26 which rotates together with the roll 16 of the stencil sheet 1 via the rotary shaft 24. As shown in FIG. 5, the silicon damper 60 has a housing 62 containing a silicone oil 61 as a viscous body. Silicone oil 6 is provided in the housing 62.
Two rotating plates 63a that rotate to receive the resistance of
63b are arranged facing each other. The rotating plates 63a and 63b are respectively connected to the respective shafts 64a and 64b on the same axis protruding in opposite directions outside the housing 62. Then, one shaft 6 of the silicon damper 60
4a (on one rotating plate 63a side), the first damper gear 3
The first damper gear 30 is meshed with the output gear 26.

The other shaft 64b of the silicon damper 60
The second damper gear 31 is attached to (the other rotating plate 63b side). A plurality of (three in FIG. 2 and FIG. 4) planet gears 32 of the same shape are meshed with the second damper gear 31. Each planetary gear 32 is meshed with an annular gear 33. The annular gear 33 has internal teeth 33a and external teeth 33b, which are meshing teeth, on the inner and outer circumferences formed in an annular shape. Each planetary gear 32 has an annular gear 33
Are meshed with the internal teeth 33a. That is, the second damper gear 3
Reference numeral 1 denotes each planetary gear 3 on the same axis of the ring gear 33.
A sun gear meshing with 2 is formed.

A first interlocking gear 34 meshes with the external teeth 33b of the ring gear 33. The interlocking gear 34 is attached to one end of the interlocking shaft 35. In addition, interlocking axis 3
A second interlocking gear 36 is attached to the other end of the gear 5, and the second interlocking gear 36 is meshed with the output gear 26.

Each of the planetary gears 32 is supported by a corresponding support shaft 38 provided on a disc-shaped carrier 37.
The carrier 37 has an input shaft 39 which is parallel to each support shaft 38 and is provided at the center position of each support shaft 38. The shaft of the second damper gear 31 forming the sun gear is arranged on the same axis as the input shaft 39, and the shaft tip 40 is inserted into the slot 41 on the carrier 37 side.

As shown in FIG. 3, the input shaft 39 extends outside the main body frame 2 and is rotatably supported on the main body frame 2 side by a bearing or the like. Thereby, each planetary gear 32 is supported by the carrier 37 via the input shaft 39, and the annular gear 33 is meshed and supported by each planetary gear 32. Further, the silicon damper 60 has a structure in which the first damper gear 30 meshes with the output gear 26, the second damper gear 31 meshes with each planetary gear 32, and the shaft tip 40 of the shaft of the second damper gear 31 is the carrier. 37 is supported by being inserted therethrough. Further, an interlocking shaft 35 to which the first interlocking gear 34 and the second interlocking gear 36 are attached
Is rotatably supported on the side plate 23 side by a bearing or the like.

As shown in FIG. 2 and FIG.
A pulley 45 is attached to a portion extending outside the main body frame 2. An annular belt 48 is wound around the pulley 45 together with a pulley 47 that is rotationally driven by a driving mechanism 46 that rotationally drives the platen roller 9.

The drive mechanism 46 has a drive motor 49. A drive gear 51 is attached to an output shaft 50 of the drive motor 49. The driving gear 51 includes a driven gear 52
The pulley 47 is attached to a support shaft 53 to which the driven gear 52 is attached. A pulley 54 for driving the platen roller 9 to rotate is also attached to the support shaft 53. On the other hand, a pulley 56 is also attached to the rotation shaft 55 of the platen roller 9. An annular belt 57 is wound around the pulley 54 and the pulley 56.

Hereinafter, the operation of the tension applying device will be described. First, when the drive motor 49 of the drive mechanism 46 is driven, the pulley 5 is driven by the engagement of the drive gear 51 and the driven gear 52.
4 rotates. The rotation of the pulley 54 causes the belt 5 to rotate.
The pulley 56 is rotated via 7 to rotate the platen roller 9. At this time, the band-shaped stencil sheet 1 pulled out from the roll 16 is hung between the platen roller 9 and the thermal head 10 and transported by the rotation of the platen roller 9 after being hung on the set guide shaft 8 and heat-sensitive. Perforations are made.

When the stencil sheet 1 is pulled out and transported,
The rotation shaft 24 rotates in the direction of arrow A in FIG. Then, the output gear 26 is rotated by the rotation of the rotating shaft 24, and the first damper gear 30 meshing with the output gear 26 is rotated in the direction of arrow B in FIG. The first damper gear 30 rotates one of the rotating plates 63a in the housing 62 of the silicon damper 60 described above. Thereby, one of the rotary plates 63a on the side where the first damper gear 30 is provided.
Is loaded by the resistance of the silicon oil 61.
Since this load is applied in a direction opposite to the rotation of the roll 16 (the direction of arrow A in FIG. 4), tension is applied to the stencil sheet 1 pulled out from the roll 16.

At the same time as the transfer of the stencil sheet 1 by the rotation of the platen roller 9, the drive of the drive motor 49 of the drive mechanism 46 is transmitted from the pulley 47 to the pulley 45 via the belt 48 as shown in FIG. Is done. The rotation transmitted to the pulley 45 rotates the input shaft 39 of the carrier 37. The rotation direction of the input shaft 39 is the same as that of the platen roller 9 and is the direction indicated by the arrow C in FIG. When the input shaft 39 rotates, a support shaft 38 that supports each planetary gear 32
Rotates around the input shaft 39. Each planetary gear 32
4 moves in the direction of arrow C in FIG. 4 along with the rotational movement of the support shaft 38, and moves along the internal teeth 33a of the meshed annular gear 33 around the support shaft 38 in the direction of arrow D in FIG. Rotate.

When each planetary gear 32 rotates, the second damper gear 31 meshing with each planetary gear 32 is moved to the position shown in FIG.
It rotates in the direction of the middle arrow D, that is, in the same direction as the rotation direction of the first damper gear 30 (the direction of the arrow B in FIG. 4).

The output gear 26 has a second interlocking gear 36
Are engaged. Therefore, the second interlocking gear 36 rotates the output gear 26 in the direction of arrow A in FIG.
It rotates in the direction of the middle arrow F. When the second interlocking gear 36 rotates, the first interlocking gear 34 connected to the second interlocking gear 36 via the interlocking shaft 35 rotates in the direction of arrow G in the figure. Further, when the first interlocking gear 34 rotates, the ring gear 33 meshing with the first interlocking gear 34 is moved to an arrow H in FIG.
Rotate in the direction.

Here, the rotation of the drive motor 49 is always constant. Therefore, since the platen roller 9 is driven to rotate at a constant rotation speed, the stencil sheet 1 is constantly rolled at a constant amount.
Send out from 6. As the stencil sheet 1 is sent out from the roll 16, the winding diameter of the roll 16 decreases. The rotation speed of the roll 16 when the winding diameter is small is faster than the rotation speed when the winding diameter is large. Therefore, the output gear 26
, The rotation speed of the first damper gear 30 rotating via the roller 16 increases proportionally, and the tension applied to the stencil sheet 1 drawn from the roll 16 tends to increase relatively proportionally.

However, as the rotation speed of the roll 16 increases, the rotation speed of the output gear 26 increases. Thereby, the rotation speed of the second interlocking gear 36 also increases, and the rotation speed of the first interlocking gear 34 increases. And the first interlocking gear 34
As the rotation speed of the ring gear 33 increases, the rotation speed of the ring gear 33 increases, and the rotation speed of each planetary gear 32 increases. Thereby, the rotation speed of the second damper gear 31 increases. As described above, the rotation of the roll 16 is transmitted to the second damper gear 31 by the rotation transmission means formed by the gear group constituted by the above-described gears. The rotation speed transmitted to the second damper gear 31 is directly proportional to the rotation speed of the roll 16.

Then, the first damper gear 30 (one rotary plate 63a of the silicon damper 60) and the second damper gear 31
(The other rotating plate 63b of the silicon damper 60) has the same rotation direction, and the rotation speed of the second damper gear increases as the winding diameter of the roll 16 decreases. The resistance of the silicon oil 61 applied to the plate 63a is suppressed by the rotation of the other rotating plate 63b. Therefore, the load on the stencil sheet 1 that tends to increase and increase the rotation speed of the first damper gear 30 is suppressed. As a result, regardless of the change (decrease) in the winding diameter of the roll 16, the load applied to the roll 16 is always substantially constant.

As described above, the silicon damper 60 reduces the resistance of the silicon oil 61 in the housing 62 to one of the rotating plates 63.
A load means is provided to apply a load directly proportional to the rotation speed of the roll 16 to the rotation of the roll 16 when the rotation speed of the roll 16 is received. Further, the silicon damper 60 transmits the resistance of the silicon oil 61 received by the one rotating plate 63a to the other rotating plate 63b, which is rotated in the same direction as the one rotating plate 63a by transmitting the rotation of the roll 16, to rotate the roll 16. It also has load suppression means for suppressing against speed.

In the case of the tension applying device having the above structure, the rotation speed at which one of the rotary plates 63a of the silicon damper 60 is rotated by the first damper gear 30 is V1, and the other of the silicon damper 60 by the second damper gear 31 is V1. Rotating plate 6
Assuming that the rotation speed at which 3b is rotated is V2, the relationship of V1> V2 can always be maintained by the gear ratio of each gear. In this way, the load generated by the first damper gear 30 is not canceled by the second damper gear 31, and tension is always applied to the stencil sheet 1 pulled out from the roll 16.

Therefore, according to the tension applying device described above, when the stencil sheet 1 is made, no stencil wrinkles or image shrinkage occur. Therefore, appropriate plate making is performed, and plate making faithful to image information is performed.

The above-described example is an example in which the present invention is applied to a stencil type stencil printing apparatus, and the stencil sheet 1 is used as a recording medium. However, the present invention can also be applied to a facsimile or the like using a roll of thermal paper or the like. That is, the present invention can be effectively applied to a roll-shaped recording medium that needs to be imparted with tension when pulled out and supplied.

[0045]

As described above, the tension applying device for a recording medium according to the present invention comprises a load means for applying a load to the rotation of the roll in conjunction with the rotation of the roll, a load suppressing means for suppressing the load of the load means, There is provided a rotation transmitting means for operating the load means and the load suppressing means in conjunction with the rotation of the roll. For this reason, even if the rotation speed of the roll fluctuates, the load applied to the recording medium is kept substantially constant. For this reason, a moderate back tension is always applied to the recording medium pulled out from the roll, and the processing on the recording medium is properly performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a plate-making printing apparatus employing a tension applying device of the present invention.

FIG. 2 is an enlarged view of the tension applying device in FIG.

FIG. 3 is a front view of the tension applying device.

FIG. 4 is an exploded view of the tension applying device.

FIG. 5 is a schematic configuration diagram showing a load unit and a load suppression unit of the tension applying device.

FIG. 6 is a side sectional view of a conventional plate-making printing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... stencil paper (recording body), 26 ... output gear, 30 ... first damper gear, 31 ... second damper gear, 32 ... planetary gear,
Reference numeral 33 denotes an annular gear, 34 denotes a first interlocking gear, 36 denotes a second interlocking gear, 60 denotes a silicon damper, 61 denotes silicon oil (a viscous body), 63a denotes one rotating plate, and 63b denotes the other rotating plate.

Claims (2)

[Claims] 1. A tensioning device for a recording medium for applying tension to a belt-shaped recording medium drawn from a roll of a recording medium rotatably supported, wherein a load that increases in proportion to a rotation speed of the roll is controlled. Load means for applying to the rotation of the roll, load suppressing means for suppressing the load applied to the roll by the load means with an increase in the rotation speed of the roll, and rotation of the roll to the load means and the load suppressing means. And a rotation transmitting means for transmitting the rotation. 2. The load means has one rotating plate that rotates by receiving the resistance of a viscous body via an output gear that rotates with the roll, and the load suppressing means is configured to be connected to the one rotating plate. A rotating gear that faces the other rotating plate via the viscous body, wherein the rotation transmitting unit forms a gear group that transmits rotation in the same direction as the one gear to the other rotating plate via the output gear; The tension applying device for a recording medium according to claim 1, wherein: