JP2007326278A - Method and device for regulating nip pressure between rolls - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable regulation of the nip pressure of one nip part by a simple means, without giving a change to the nip pressure of the other nip part, in the case when the nip parts are formed by a roll of which the axis is shiftable in relation to two rolls of which the axes are fixed in a state of being apart from each other, and thereby to facilitate the regulation of the nip pressure. <P>SOLUTION: A third roll 3 being movable is given an elastic force E to be applied toward the sides of a first roll 1 and a second roll 2 being fixed and thereby initial nip pressures are formed between the first roll and second roll. By rotating thereafter the third roll around a first point P1 located on a straight line L1 or in the vicinity thereof, the nip pressure of the nip part N2 of the third roll and the second roll is regulated, and by rotating the third roll around a second point P2 located on a straight line L2 or in the vicinity thereof, the nip pressure of the nip part N1 of the third roll and the first roll is regulated. On the occasion, the nip pressure of the other nip part hardly changes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, at least one of the rolls forming the nip portion is formed of an elastic roll, and a roll having a movable shaft center is brought into contact with both of the two rolls whose shaft centers are fixed at positions separated from each other. In particular, when adjusting the nip pressure of one nip portion, the nip pressure is adjusted almost without changing the nip pressure of the other nip portion. This makes it easy to adjust the nip pressure at the two nip portions.

  FIG. 6 shows a schematic configuration of the inking device 08 and the dampening device 09 of the printing device 02 of the sheet-fed offset printing press. As shown in FIG. 6, the inking device 08 has an ink supply amount adjusting device 010 in the upstream portion thereof, and supplies the ink stored in the ink fountain 018 in an amount necessary for printing, and the ink is supplied by a number of rolls. Subdivide and equalize the film thickness and knead the ink. The dampening device 09 is supplied with the dampening water stored in an amount necessary to maintain a state suitable for printing.

In addition, between the inking device 08 and the dampening device 09, between the plurality of form rolls T1 to T5 joined to the plate cylinder 04, the ink fountain 018, and between the form rolls T1 to T5 and the water tank 017. A plurality of interposed rolls S1 to S6 are provided.
In the case of offset printing, the non-image portion (that is, the non-image portion) of the printing plate wound around the surface of the plate cylinder 04 is attached with water so that the ink is less likely to adhere to the image portion (that is, the image portion). ) Ink is attached only to.

However, when this is a new ink (zero moisture content), even if water is supplied to the non-image area, the ink tends to adhere and stains often occur. Several percent).
For this reason, the water supply amount is temporarily increased at the start of printing, or an operation in which water is mixed into the ink in advance is performed.

  In FIG. 6, rolls S1 to S6 that sequentially transfer and transmit water or ink from the ink fountain 018 or the water tank 017 to the plate cylinder 04 are, as shown in FIG. 7, a rigid roll 021 such as an iron roll and a rubber roll, for example. The elastic rolls 022 such as rolls are alternately arranged to form the nip portion N. The adjustment of the nip portion is important for transferring the ink layer or the water layer having a uniform thickness to the plate cylinder 04. In addition, as for the said transfer roll, both the rolls which form a nip part may be an elastic roll.

  As a conventional nip adjusting mechanism, for example, Patent Document 1 (Japanese Patent Laid-Open No. 9-39211) discloses a nip adjusting mechanism as shown in FIG. In FIG. 8, the rubber roll 034 forms nip portions N1 and N2 with respect to the iron rolls 031 and 032 which are fixed and separated from each other, and the shaft core 034a of the rubber roll 034 is provided on the side of the iron roll by the spring 035 provided on the bearing 033. Since the spring force E is applied, a nip pressure n1 is generated between the iron roll 031 and a nip pressure n2 is generated between the iron roll 032.

  In this way, the nip is set with respect to the iron rolls 031 and 032 by one spring 035. When nip adjustment is necessary, the fixing bolt 037 for fixing the bearing 033 of the rubber roll 034 is loosened and the jack bolt 036 is set. The nip adjustment is performed by operating and moving the bearing 033.

Further, the nip adjusting mechanism disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 5-254101) includes a rigid ink or dampening water kneading roll and a rigid plate cylinder, whose shaft centers are fixed apart from each other, and A case in which an axis or an ink or dampening water application roll that can move in a direction approaching or separating from the kneading roll and the plate cylinder is provided, and the nip portion is formed by the kneading roll, the plate cylinder, and the application roll This is a nip adjusting mechanism.
This mechanism is configured to be able to approach or separate from the plate cylinder while moving on a trajectory in contact with the outer periphery of the kneading roll when the wearing roll is supported by a turning lever supported by a machine frame. The nip pressure can be adjusted.

JP-A-9-39211 JP-A-5-254101

  However, in the nip adjusting mechanism disclosed in Patent Document 1, when the nip pressure of one side roll (for example, iron roll 031) is adjusted, the nip pressure of the nip portion of the reverse side roll (for example, iron roll 032) also changes. In addition, there is a problem that the position of the bearing 033 is likely to fluctuate because the fixing bolt 037 for fixing the bearing 033 of the rubber roll 034 is loosened when adjusting the nip pressure.

  Further, the nip adjusting mechanism disclosed in Patent Document 2 can adjust the nip pressure of the dressing roll with respect to the plate cylinder without causing a change in nip pressure with respect to the kneading roll. The adjustment of the nip pressure for the kneading roll requires changing the relative position of the two with the adjusting bolt one by one, and the nip pressures of the two nip portions cannot be adjusted simultaneously, which is troublesome, There is a problem that a mechanism for moving on the locus in contact with the outer periphery of the kneading roll becomes complicated.

  In view of the problems of the prior art, the present invention provides two rolls whose axes are fixed apart from each other, such as a plate cylinder of a printing press and the above-described ink or fountain roll or kneading roll. On the other hand, when the nip part is formed with a roll whose axis can move, by making it possible to adjust the nip of the other nip part by a simple means without changing the nip pressure of the one nip part, An object of the present invention is to realize an adjustment mechanism that can easily adjust the nip pressures of two nip portions in a short time.

In order to achieve the above object, the nip adjusting method of the present invention comprises:
At least one of the rolls forming the nip portion is constituted by an elastic roll, and a third roll whose axis is movable is provided to both the first roll and the second roll whose axes are fixed at positions separated from each other. In the method for adjusting the nip pressure between rolls formed by contacting to form a nip portion,
An elastic force directed toward the first and second rolls is applied to the third roll to form a nip portion having an initial nip pressure set between the first roll and the second roll, and the nip Forming an equilibrium state in which the elastic force, the nip pressure, and the roll self-weight are balanced at the part,
By rotating the third roll forward and backward about a first point located on or near the straight line connecting the rotation center of the third roll and the rotation center of the first roll, The nip adjustment between the third roll and the second roll is performed while minutely suppressing the nip pressure change between the three rolls and the first roll,
By rotating the third roll forward and backward about a second point located on or near the straight line connecting the rotation center of the third roll and the rotation center of the second roll, The purpose is to adjust the nip pressure between the third roll and the first roll while minimizing the change in the nip pressure between the third roll and the second roll.

In the method of the present invention, first, an elastic force directed toward the first and second rolls is applied to the third roll, and the first and second rolls are adjusted while adjusting the position of the third roll and the elastic force. A nip portion having an initial nip pressure set between both the third roll and the third roll is formed.
At this time, the pressing direction of the elastic force can be set in an arbitrary direction corresponding to the position of the nip portion and the vector direction of the roll weight, so that the nip pressure, the roll weight and the roll weight are set in the nip portion. An equilibrium state in which the elastic force is balanced is formed. This equilibrium state is automatically and uniquely determined by the position of the nip portion between the rolls and the nip pressure, the roll weight, and the direction and value of the elastic force applied to the third roll.

  When the initial nip pressure is set as described above and the nip pressure between the first roll and the third roll needs to be finely adjusted, the rotation center of the third roll and the rotation center of the second roll are connected. The relative position between the first roll and the third roll is changed by rotating the third roll forward or backward around the second point located on or near the straight line, thereby changing the both rolls. Adjust the nip pressure between. At this time, the nip pressure change between the second roll and the third roll can be suppressed to a minute range.

  On the other hand, when a fine adjustment is required for the nip pressure between the second roll and the third roll, the first position located on or near the straight line connecting the rotation center of the third roll and the rotation center of the first roll. By rotating the third roll forward and backward around the point 1, the relative position between the second roll and the third roll is changed, and the nip pressure between the two rolls is adjusted. At this time, a change in the nip pressure between the first roll and the third roll can be suppressed to a minute range.

  The configuration and operation of the present invention will be described with reference to FIG. In FIG. 1, a first roll 1 and a second roll 2 which are arranged apart from each other and whose rotation center is fixed are arranged with a third roll 3 whose rotation center is movably supported by a bearing 4. Since the 3rd roll 3 is supported by the bearing 4 via the elastic force provision means (spring) 5 which provides the elastic force E to the 1st roll 1 and the 2nd roll 2 side, the 1st roll 1 and the 2nd roll Nipping portions N1 and N2 are formed in contact with the roll 2, respectively.

  At this time, an equilibrium state is formed in which the nip pressure, the roll weight, and the elastic force E applied to the third roll 3 by the elastic force applying means 5 are balanced between the rolls. The nip pressure at this time is set to the initial nip pressure set by adjusting the position of the third roll 3 and the elastic force E.

  A first point P1 is set on a straight line L1 connecting the rotation center 1a of the first roll 1 and the rotation center 3a of the third roll 3, and the rotation center 2a of the second roll 2 and the rotation center 3a of the third roll 3 are set. The second point P2 is set on a straight line L2 connecting the two and the third roll 3 is configured to be rotatable forward or backward about the first point P1, and centered on the second point P2. It is configured to be rotatable forward or backward.

  When it is necessary to further finely adjust the nip pressure of the nip portion N1 between the first roll 1 and the third roll 3 while the set initial nip pressure is formed, the third roll 3 is moved to the second roll 3. The fine adjustment can be performed by rotating forward or backward about the point P2. That is, the third roll 3 moves toward the second roll 2 in the tangential direction of the second roll. For example, when the third roll 3 is rotated forward about the second point P2 by an angle t, the point B on the outer periphery of the roll moves to the point B ′, but “the length of the point P2 and the point B ′” ≈ “the point P2 Therefore, the distance between the rotation center 1a of the second roll 2 and the rotation center 3a of the third roll 3 is hardly changed, and therefore the nip pressure hardly changes in the nip portion N2. .

On the other hand, since the third roll 3 moves toward the center of the first roll 1 with respect to the first roll 1, the distance between the rotation centers 1a and 3a changes, and the nip pressure changes in the nip portion N1.
That is, when the third roll 3 is rotated forward about the second point P2 by an angle t, the point A on the outer peripheral surface of the third roll before the rotation is a point A ′ that enters inside the outer peripheral surface of the first roll 1. Come to the position.
Since the rotation center 3a of the third roll 3 approaches the rotation center 1a side of the first roll 1 by this amount, the nip pressure of the nip portion N1 increases.

  When the third roll 3 rotates in the reverse direction, the third roll 3 is separated from the first roll 1 and the nip pressure becomes small. On the other hand, in the second roll 2, even when the third roll 3 rotates in the reverse direction, the distance between the rotation centers of both rolls hardly changes, and the nip pressure hardly changes in the nip portion N2.

  In order to finely adjust the nip pressure of the nip portion N2 between the second roll 2 and the third roll 3, the third roll 3 may be rotated forward or backward about the first point P1. At this time, since the distance between the rotation center 1a of the first roll 1 and the rotation center 3a of the third roll 3 hardly changes, the nip pressure hardly changes in the nip portion N1. On the other hand, since the distance between the rotation center 2a of the second roll 2 and the rotation center 3a of the third roll 3 changes, the nip pressure of the nip portion N2 changes.

In FIG. 1, the first point P1 and the second point P2 are positions on the straight line L1 or L2 that are separated from the first roll 1 and the second roll 2 from the rotation center 3a of the third roll 3. However, even if it is arranged on one of the straight lines L1 or L2 closer to the first and second rolls than the rotation center 3a of the third roll 3, the effects of the present invention can be obtained. .
Further, in FIG. 1, the first point P1 and the second point P2 are both on the straight line L1 or the straight line L2, and are in a position where an ideal operation is performed as the nip adjusting mechanism of the present invention. However, even if the first point P1 or the second point P2 deviates slightly from the ideal position and slightly deviates from the straight line L1 or the straight line L2, the nip pressure adjustment of the present invention is possible.

FIG. 2 shows the state at this time. FIG. 2 shows that the first point P1 is located on an inclined line L1 ′ inclined -6 degrees in the reverse direction from the straight line L1, and the second point P2 is an inclined line inclined +6 degrees in the positive direction from the straight line L2. The case where it is located on L2 'is shown. According to the verification by the present inventors, if the first point P1 is in a region surrounded by the straight line L1 and a straight line inclined ± 6 ° in the forward and reverse directions from the straight line L1, the nip pressure of the nip portion N2 is adjusted. It has been found that the nip pressure change of the nip portion N1 can be held within an allowable minute range.
Further, if the second point P2 is in a region surrounded by a straight line L2 and a straight line inclined ± 6 ° forward and backward from the straight line L2, the nip change of the nip portion N2 can be allowed when adjusting the nip pressure of the nip portion N1. It turned out that it can be held within the range.

  Normally, the nip width of the nip portion N between the iron roll 021 and the rubber roll 022 shown in FIG. 7 is preferably 6 to 8 mm, and if within this range, the water layer or ink layer on the kneading roll is uniformly formed in the printing machine. Thus, the transfer of the water layer or ink layer to the plate cylinder can be in a good state for printing. According to the verification by the present inventors, it was found that the nip width of the nip portion N on the non-adjustment side varies by 1 mm when the inclination angle from the straight line L1 or the straight line L2 in FIG.

  Therefore, if the first point P1 and the second point P2 are within the region, the nip width variation of the nip portion N on the non-adjustment side can be suppressed to within 1 mm, so that it is on the straight line P1 or the straight line P2. Compared to the ideal state, the nip pressure change in the other nip portion can be held within a minute range that can be allowed when adjusting the nip pressure in the other nip portion.

Therefore, according to the method of the present invention, even if the nip pressure adjustment on one side of the two nip portions between the first roll and the third roll is performed, the change in the nip pressure on the other side can be suppressed minutely. The nip pressure can be finely adjusted accurately without reworking, and the adjustment time can be shortened.
If the first to third rolls are transfer roll groups or plate cylinders of a printing press that transfers ink or fountain solution from the ink or water storage tank to the plate cylinder, the nip pressure adjustment between these rolls is adjusted. Accurate and in a short time, the amount of ink and fountain solution set on the plate cylinder can be transferred accurately, and the work time required for adjusting the nip pressure can be greatly reduced. .

In the nip pressure adjusting device according to the present invention, at least one of the rolls forming the nip portion is constituted by an elastic roll, and the first roll and the second roll and the shaft center each having a shaft center fixed at a position apart from each other. In a nip pressure adjusting device between rolls formed by forming a nip portion with a movable third roll,
An elastic force applying means for applying an elastic force toward the first and second rolls to the third roll to form a nip pressure between the third roll and the first and second rolls;
The pressing direction of the elastic force applied to the third roll by the elastic force applying means can form an equilibrium state in which the elastic force, the nip pressure and the roll weight are balanced in the nip portion. It is possible to change the orientation according to the vector direction of the position and roll weight,
Making the third roll rotatable forward and backward about a first axis arranged on or near the straight line connecting the axis of the third roll and the axis of the first roll;
A configuration in which the third transition roll can be rotated forward and backward about a second axis arranged on or near the straight line connecting the axis of the third roll and the axis of the second roll. It is.

In the device of the present invention, first, the position of the third roll whose axis can move and the elastic force applied to the third roll by the elastic force applying means are adjusted to be between the third roll and the first roll and the second roll. A nip portion is formed on the nip portion, and an initial nip pressure set in the nip portion is applied. Here, since the pressing direction of the elastic force applied to the third roll is configured to change the direction according to the position of the nip portion and the vector direction of the roll's own weight, the elastic force at the nip portion, An equilibrium state in which the nip pressure and the roll weight are balanced can be formed.
This equilibrium state is automatically and uniquely determined by the position of the nip portion between the rolls and the nip pressure, the roll weight, and the direction and value of the elastic force applied to the third roll.
As a configuration capable of forming such an equilibrium state, for example, the support bearing that supports the axis of the third roll is not fixed, and the configuration is such that the shaft center position can be adjusted, and after the equilibrium state is formed, The support bearing may be fixed.

  When the initial nip pressure is set in this way and the nip pressure between the first roll and the third roll or between the second roll and the third roll needs to be finely adjusted, it is the same as the method of the present invention described above. It is sufficient to perform the operation. That is, when fine adjustment is required for the nip pressure between the first roll and the third roll, the straight line connecting the axis of the second roll and the axis of the third roll or the vicinity of the straight line, that is, the straight line By rotating the third roll forward or backward about the second axis arranged in the region between the tilt line tilted ± 6 degrees around the axis of the third roll, the first roll and the second roll The relative position between the three rolls is changed, thereby adjusting the nip pressure between the two rolls. At this time, the nip pressure change between the second roll and the third roll can be suppressed to a minute range.

  On the other hand, when it is desired to finely adjust the nip pressure between the second roll and the third roll, the straight line connecting the axis of the first roll and the axis of the third roll or the vicinity of the straight line, that is, the straight line is the third line. The second roll and the third roll are rotated by rotating the third roll forward or backward about the first axis arranged in the region between the tilt line tilted ± 6 degrees around the roll axis. The relative position between them is changed, thereby adjusting the nip pressure between both rolls. At this time, a change in the nip pressure between the first roll and the third roll can be suppressed to a minute range.

Further, the apparatus according to the present invention is relatively moved along a bearing structure for supporting a rotary shaft provided at both ends of the third roll, and a support surface facing the rotary shaft end face of the third roll. And a support frame that supports it,
The bearing structure is fixed to a base portion of the bearing structure, and supports a rotation shaft of the third roll via the elastic force applying means, a rotation shaft of the third roll, and the third roll. The first projecting from the support surface of the support frame in a region between a straight line connecting the rotation axis of one roll and an inclined line inclined by ± 6 degrees about the rotation axis of the third roll. In a region between the pin, a straight line connecting the rotation axis of the third roll and the rotation axis of the second roll, and an inclined line inclined by ± 6 degrees about the rotation axis of the third roll. A second pin projecting from the support surface of the support frame, and a first pin fixed to the first pin and slidably fitted in a first space provided at the base of the bearing structure. 1 spacer and a second space fixed to the second pin and provided in the base of the bearing structure. The bearing structure can be rotated forward and backward about the first pin by sliding the second spacer movably fitted in the first space and sliding the first spacer inside the first space. And a second moving means for sliding the second spacer in the second space so that the bearing structure can be rotated forward and backward about the second pin. And moving means,
The rotating shaft of the third roll is supported by the bearing structure or the support frame so that the pressing direction of the elastic force applied to the third roll can be changed so that the equilibrium state can be formed. Can do.

  With this configuration, first, by applying an elastic force toward the first roll and the second roll by the elastic force applying means to the third roll, the nip portion is formed between the first roll, the second roll, and the third roll. Form. At this time, an initial nip pressure set between the first roll and the second roll is formed. Further, since the elastic force is configured so that the pressing direction can be changed, an equilibrium state is formed in which the elastic force, the nip pressure, and the roll weight are balanced in the nip portion.

  In the state where the initial nip pressure is set as described above, when the nip pressure between the first roll and the third roll needs to be finely adjusted, the second moving means moves the second spacer to the second roll. By sliding within the space, the bearing structure rotates the third roll forward or backward about the second pin. Thereby, the relative position between the first roll and the third roll can be changed, and the nip pressure between the two rolls can be adjusted. At this time, the nip pressure change between the second roll and the third roll can be suppressed to a minute range.

  On the other hand, when it is desired to finely adjust the nip pressure between the second roll and the third roll, the bearing structure is formed by sliding the first spacer inside the first space by the first moving means. The body rotates the third roll forward or backward about the first pin. This changes the relative position between the second roll and the third roll, and adjusts the nip pressure between the two rolls. At this time, a change in the nip pressure between the first roll and the third roll can be suppressed to a minute range.

According to such a configuration, since the first pin and the second pin are protruded and fixed to the support surface of the support frame, the relative position hardly changes between the third roll and the support frame, The same relative position can be maintained.
Further, the differential bolt for screwing the first or second moving means with the first or second spacer through the wall of the bearing structure base portion surrounding the first or second space. It can be. In such a configuration, the third roll can be easily rotated in the forward and reverse directions around the first or second pin only by rotating the differential bolt, and the first or second The amount of movement of the spacer can be finely adjusted by rotating the differential bolt.

  According to the method and the device of the present invention, the pressing direction of the elastic force applied to the third roll by the elastic force applying means is determined based on the position of the nip portion between the first roll, the second roll, and the third roll, and the roll weight. Since the elastic force, the nip pressure, and the roll weight are balanced in the nip portion, the initial nip pressure set in the nip portion can be easily achieved. Can be formed.

Even if the nip pressure between one of the first roll or the second roll and the third roll is adjusted after such initial setting, the change in the nip pressure between the other roll and the third roll can be suppressed to a small extent. Therefore, both nip pressures can be accurately adjusted by one nip adjustment, and re-adjustment is unnecessary, so that nip pressure adjustment can be simplified.
Further, the nip pressure adjustment device at two nip portions can be adjusted only by setting two rotation centers in a single bearing device that supports the third roll, and the nip pressure adjustment device can be made compact.
Therefore, if it is applied to a large number of transfer roll groups and a printing press roll that requires adjustment of the nip pressure between the plate cylinders, labor and time required for adjusting the nip pressure can be greatly reduced.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the present invention to that only, unless otherwise specified.
FIG. 3 is a perspective view showing a first embodiment in which the present invention is applied to a nip pressure adjusting mechanism of a printing press roll that performs transfer transfer of ink or water, in which a bearing portion is cut horizontally and an upper part is removed. 4 is a perspective view showing the bearing portion of FIG. 3 with the roll shaft support portion 20 removed, and FIG. 5 is an explanatory view schematically showing the configuration of the first embodiment.

  3 and 4 showing the first embodiment, the hatched surface indicates a cut surface. As shown in FIG. 5, the nip adjusting mechanism of this embodiment is configured such that the rubber roll 13 is a coil spring 25 (elasticity) with respect to the first iron roll 11 and the second iron roll 12 that are separated from each other and whose rotation shaft is fixed. It is supported by the bearing device 14 via a force applying means). The rubber roll 13 is provided with an elastic force on the iron rolls 11 and 12 side by a coil spring 25, contacts the iron rolls 11 and 12 to form nip portions N1 and N2, respectively, and performs transfer transfer of ink or water. The nip pressure adjusting mechanism is configured. In FIG. 3, only the first iron roll 11 is shown, and the second iron roll 12 is omitted.

  In FIG. 5, the bearing device 14 that supports the rubber roll 13 in FIG. 3 supports the roll shaft that forms the nip pressure by applying the elastic force E to the first iron roll 11 side while supporting the rotating shaft 13a of the rubber roll 13. A support frame 40 having a support surface 41 that is supported by a machine frame (not shown) and is provided so as to face the end surface of the rotary shaft 13a, and a support frame 40 for adjusting the nip pressure of the nip portion N1 or N2. The bearing structure 30 is relatively movable along the support surface 41.

  The roll shaft support portion 20 is a casing 21 formed with a concave portion 21a that accommodates the rotary shaft 13a and a concave portion 21b that accommodates a coil spring 25 or the like that applies elastic force to the iron rolls 11 and 12 with respect to the rotary shaft 13a. It is configured. In the recess 21b, a pin 22 planted and fixed on the support surface 41, a cylinder 23 fitted in the pin 22 and a hole 23a, a hexagonal flange 24 fitted and fixed to a wall portion of the casing 21, and a cylinder 23 A coil spring 25 is accommodated which is inserted between the hexagonal hook 24 and applies an elastic force to the rotary shaft 13a via the casing 21 by applying an elastic force to the hexagonal hook 24.

  Further, as shown in FIG. 4, the bearing structure 30 includes a casing 31 in which a first space 32a and a second space 32b are formed in the upper and lower sides, and a support surface 41 that is positioned inside the first space 32a. The first pin 33a implanted and fixed in the second space 32b, the second pin 33b positioned and fixed in the support surface 41 inside the second space 32b, and slidable in the first space 32a While being loosely fitted, the first spacer 34a is fitted and fixed to the first pin 33a and loosely fitted to the second space 32b, and is fitted and fixed to the second pin 33b. The second spacer 34b and the female screw portion formed in the through hole 36a provided in the first spacer 34a, inserted into the first space 32a from the through hole formed in the wall portion of the casing 31. Similarly to the first differential bolt 35a screwed with 37a A second hole 32b is inserted into the second space 32b through a through hole formed in the wall of the housing 31 and screwed into a female screw portion 37b formed in the through hole 36b provided in the second spacer 34b. It consists of a differential bolt 35b.

As shown in FIG. 5, the first pin 33a is disposed on a straight line L1 connecting the rotation shaft 11a of the first iron roll 11 and the rotation shaft 13a of the rubber roll 13, and the second pin 33b is a second pin 33b. Are disposed on a straight line L2 connecting the rotation shaft 12a of the iron roll 12 and the rotation shaft 13a of the rubber roll 13.
Note that the casing 21 of the roll shaft support portion 20 is fixed and supported by the casing 31 of the bearing structure 30.

  Next, an operation method of the apparatus of this embodiment will be described. When the nip pressure between the rolls is not adjusted, the bearing device 14 screwes the fixing bolt 38 into the screw hole 42 provided in the support frame 40 as shown in FIG. 40 is fixed.

  Next, the first and second differential bolts 35 a and 35 b of the bearing structure 30 are held in a substantially neutral position, and the rubber roll 13 is supported by supporting the rotating shaft 13 a of the rubber roll 13 on the roll shaft support portion 20. Assembled on the first and second iron rolls 11 and 12 side. At this time, the rubber roll 13 is pressed against the first and second iron rolls 11 and 12 by the elastic force E of the coil spring 25 to form the nip portions N1 and N2 that become the set initial nip pressures n1 and n2.

  At this time, since the casing 21 is not fixed to the casing 31 and is supported so that the position can be adjusted, the pressing direction of the elastic force E depends on the positions of the nip portions N1 and N2 and the weight of the roll. The direction can be changed in accordance with the vector direction, whereby an equilibrium state in which the elastic force E, the nip pressures n1 and n2, and the roll weight are balanced can be formed.

  In the initial state, when it is necessary to finely adjust the nip pressure n1 between the first iron roll 11 and the rubber roll 13, first, the fixing bolt 38 is loosened, and the bearing structure 30 is moved along the support surface 41. It is possible to move relative to the support frame 40. Next, the first differential bolt 35a is rotated forward or backward to slide the first spacer 34a in the first space 32a. As a result, the bearing structure 30 rotates in the forward or reverse direction around the second pin 33b.

  This operation will be described with reference to FIG. 5. If the rubber roll 13 is rotated by the angle t in the positive direction around the second pin 33b, the point A on the outer diameter of the rubber roll 13 will move to A ', Since the distance between the rotating shaft 11a of the iron roll 11 and the rotating shaft 13a of the rubber roll 13 is shortened, the nip pressure of the nip portion N1 is increased. Further, if the rubber roll 13 is rotated in the reverse direction around the second pin 33b, the distance between the rotation shaft 11a of the first iron roll 11 and the rotation shaft 13a of the rubber roll 13 becomes longer, so that the nip pressure of the nip portion N1 is increased. Lower.

  On the other hand, in the nip portion N2 with the second iron roll 12, the point B on the outer diameter of the rubber roll 13 is moved to B ′ by the positive rotation of the angle t, and the length from the second pin 33b to B ′ Since the length from the second pin 33b to B hardly changes, the distance between the rotating shaft 12a of the second iron roll 12 and the rotating shaft 13a of the rubber roll 13 hardly changes, and therefore, the nip pressure of the nip portion N2 There is little change. The same applies to the case where the rubber roll 13 is rotated in the reverse direction.

  Further, when it becomes necessary to finely adjust the nip portion N2 between the second iron roll 12 and the rubber roll 13, the second differential bolt 35b is rotated forward or backward to move the second spacer 34b to the second position. Slide in the second space 32b. As a result, the bearing structure 30 can rotate in the forward or reverse direction around the first pin 33a to adjust the nip pressure of the nip portion N2, but the nip pressure of the nip portion N1 hardly changes. After fine adjustment of the nip portions N1 and N2, the fixing bolt 38 is tightened to fix the bearing structure 30 to the support frame 40.

  As described above, according to this embodiment, when the initial nip pressure is applied, the rotating shaft 13a of the rubber roll 13 is supported by the casing 21 in a state in which the position can be changed to some extent, so that the elastic force E applied to the rubber roll 13 is reduced. The pressing direction can be changed according to the positions of the nip portions N1 and N2 and the vector direction of the roll weight, thereby forming an equilibrium state in which the elastic force E, the nip pressures n1 and n2, and the roll weight are balanced. Can do.

Accordingly, the roll shaft support portion 20 is simply set by balancing the elastic force of the coil spring 25 and the roll's own weight at the nip portion between the first iron roll 11 and the second iron roll 12 and the rubber roll 13, and the initial nip. Pressure can be applied.
When it is necessary to finely adjust the nip portion between the first iron roll 11 or the second iron roll 12 and the rubber roll 13 with the nip pressure applied, the first differential bolt 35a or The nip pressure can be easily adjusted simply by turning the second differential bolt 35b forward or backward.

Moreover, even if the nip pressure adjustment between one iron roll and the rubber roll 13 is performed, the nip pressure change between the other iron roll and the rubber roll 13 hardly occurs. It becomes possible. Accordingly, the labor required for adjusting the nip pressure is reduced, the preparation time for printing is shortened, and the operation rate of the machine is improved. Further, it is possible to finely adjust two nip portions in one set of bearing devices 13, and the nip pressure adjusting device can be made compact.
Further, since the first and second pins 33a and 33b and the support frame 40 are connected, the support position of the rotary shaft 13a does not change even if the fixing bolt 38 is loosened, and the nip pressure n1 of the nip portions N1 and N2 And n2 can be held in a set state.

  According to the present invention, when two nip portions are formed between three rollers, the nip pressure of the other nip portion can be accurately adjusted without substantially changing the nip pressure of one nip portion. It is suitable when a nip adjustment between a large number of rolls is required as in a roll group or a plate cylinder for transferring and transferring ink or water in a printing press.

It is a principle explanatory view (in the case of an ideal state) of the present invention. It is a principle explanatory view (when deviating from an ideal state) of the present invention. It is a perspective view which cuts and shows a 1st Example of this invention partially. It is a perspective view of the bearing structure 30 of the first embodiment. It is a schematic diagram of the first embodiment. It is a block diagram which shows the roll group which carries out transfer transmission of the conventional ink and water. It is explanatory drawing which shows the nip part of an iron roll and a rubber roll. It is a schematic diagram which shows the conventional nip adjustment mechanism of a rigid roll and an elastic roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st roll 1a Rotation center of 1st roll 2 2nd roll 2a Rotation center of 2nd roll 3 3rd roll 3a Rotation center of 3rd roll 4 Bearing 5 Spring (elastic force provision means)
11 Iron roll (first roll)
12 Iron roll (second roll)
13 Rubber roll (third roll)
14 Bearing device E Elastic force L1, L2 Straight line L1 ′, L2 ′ Inclined line N1, N2 Nip part n1, n2 Nip pressure P1 First point P2 Second point 20 Roll shaft support part 25 Coil spring (elastic force applying means)
30 Bearing structure 32a First space 32b Second space 33a First pin (first shaft)
33b Second pin (second shaft)
34a First spacer 34b Second spacer 35a First differential bolt (first moving means)
35b Second differential bolt (second moving means)
40 Support frame 41 Support surface

Claims (8)

At least one of the rolls forming the nip portion is constituted by an elastic roll, and a third roll whose axis is movable is provided to both the first roll and the second roll whose axes are fixed at positions separated from each other. In the method for adjusting the nip pressure between rolls formed by contacting to form a nip portion,
An elastic force directed toward the first and second rolls is applied to the third roll to form a nip portion having an initial nip pressure set between the first roll and the second roll, and the nip Forming an equilibrium state in which the elastic force, the nip pressure, and the roll self-weight are balanced at the part,
By rotating the third roll forward and backward about a first point located on or near the straight line connecting the rotation center of the third roll and the rotation center of the first roll, Adjusting the nip pressure between the third roll and the second roll while minimizing the nip pressure change between the three rolls and the first roll,
By rotating the third roll forward and backward about a second point located on or near the straight line connecting the rotation center of the third roll and the rotation center of the second roll, A method for adjusting the nip pressure between rolls, wherein the nip pressure between the third roll and the first roll is adjusted while minimizing a change in the nip pressure between the three rolls and the second roll.   The first point or the second point is defined as a straight line connecting the axis of the third roll and the axis of the first roll or the second roll, and the straight line is centered on the axis of the third roll. The method for adjusting the nip pressure between rolls according to claim 1, wherein the nip pressure is arranged in a region between the inclined line inclined by 6 degrees.   The first to third rolls are a transfer roll group or a plate cylinder of a printing machine that transfers ink or fountain solution from an ink or water storage tank to a plate cylinder. Any one of the methods for adjusting the nip pressure between rolls. At least one of the rolls forming the nip portion is composed of an elastic roll, and the nip is composed of a first roll and a second roll whose shaft centers are fixed at positions separated from each other, and a third roll whose shaft center is movable. In a nip pressure adjusting device between rolls formed by forming a part,
An elastic force applying means for applying an elastic force toward the first and second rolls to the third roll to form a nip pressure between the third roll and the first and second rolls;
The pressing direction of the elastic force applied to the third roll by the elastic force applying means is adjusted so that the elastic force, the nip pressure, and the roll own weight are balanced in the nip portion. The configuration can be changed according to the vector direction of the position and roll weight,
Making the third roll rotatable forward and backward about a first axis arranged on or near the straight line connecting the axis of the third roll and the axis of the first roll;
The third transition roll is configured to be rotatable forward and backward about a second axis arranged on or near the straight line connecting the axis of the third roll and the axis of the second roll. A nip pressure adjusting device between rolls characterized by the above.   The first axis or the second axis, a straight line connecting the axis of the third roll and the axis of the first roll or the second roll, and the straight line centered on the axis of the third roll The apparatus for adjusting a nip pressure between rolls according to claim 4, wherein the nip pressure adjusting apparatus is disposed in a region between the inclined lines inclined by ± 6 degrees. A bearing structure for supporting a rotating shaft provided at both ends of the third roll;
A support frame that supports the bearing structure so as to be relatively movable along a support surface facing the rotation shaft end surface of the third roll;
The bearing structure is
A roll shaft support portion fixed to the base portion of the bearing structure and supporting the rotation shaft of the third roll via the elastic force applying means;
The support frame in a region between a straight line connecting the rotation axis of the third roll and the rotation axis of the first roll and an inclined line inclined by ± 6 degrees about the rotation axis of the third roll. A first pin protruding from the support surface of
The support frame in a region between a straight line connecting the rotation axis of the third roll and the rotation axis of the second roll, and an inclined line inclined by ± 6 degrees about the rotation axis of the third roll. A second pin protruding from the support surface of
A first spacer fixed to the first pin and loosely slidably fitted in a first space provided at the base of the bearing structure;
A second spacer fixed to the second pin and loosely slidably fitted in a second space provided at the base of the bearing structure;
First moving means for allowing the bearing structure to rotate forward and backward about the first pin by sliding the first spacer inside the first space;
A second moving means for allowing the bearing structure to rotate forward and backward about the second pin by sliding the second spacer inside the second space;
The rotating shaft of the third roll is supported by the bearing structure or the support frame so that the pressing direction of the elastic force applied to the third roll can be changed so that the equilibrium state can be formed. The apparatus for adjusting the nip pressure between rolls according to claim 5. The first or second moving means is
The differential bolt which penetrates the wall part of this bearing structure base part surrounding the said 1st or 2nd hollow part, and is screwed together with the said 1st or 2nd spacer. Nip pressure adjustment device between rolls. The first to third rolls are a transfer roll group or a plate cylinder of a printing press that transfers and transfers ink or fountain solution from an ink or water storage tank to a plate cylinder. The nip pressure adjusting device between rolls according to any one of the above.

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