JP3921473B2 - Blanket mounting device of printing press and blanket mounting method - Google Patents

Description

  The present invention relates to a printing machine that performs printing using a blanket cylinder such as a rotary printing machine, and in particular, a leading end and a trailing end are inserted into a groove formed in the blanket cylinder, and the leading end of the blanket and The present invention relates to a blanket mounting apparatus and a blanket mounting method for mounting on a blanket cylinder while applying a predetermined tension to the blanket by tightening a tension bar that engages with a trailing end.

In a printing press such as a rotary press for printing newspapers, a rubber blanket mounted on a printing cylinder (blanket cylinder) transfers the ink transferred from the plate cylinder to the running paper while rotating. It is carried out.
Such a blanket is attached to the blanket cylinder in a state in which tension is applied in advance in the circumferential direction so as not to cause displacement or slack due to the centrifugal force accompanying the rotation of the blanket cylinder. As a method of attaching the blanket to the blanket cylinder, there are a winding method and a T-bar method (see Non-Patent Document 1).
The former pulls the blanket by rotating the winding shaft, and the latter pulls the blanket by aligning the bars at both ends of the blanket, pressing them with a T-shaped bar, tightening them with a plurality of bolts.
Edited by the Japan Newspaper Association, “Newsprint Handbook 1st Edition 2nd Edition” (see Chapter 3 Newspaper Offset Press, Blanket Cylinder (page 63))

  By the way, with the increase in the speed of a rotary printing press, it has become important to suppress the mechanical vibration and the loss of printing pressure that affect the printing accuracy and mechanical characteristics. Mechanical vibration and missing printing pressure in the blanket cylinder are mainly caused by a gap between the leading end side and the trailing end side of the blanket mounted on the blanket cylinder. Therefore, various proposals for reducing the gap have been made.

  In the above-described winding method, after the tip member attached to the leading end of the blanket is inserted into the groove, the tip member attached to the trailing end is inserted into the groove, the winding shaft is rotated, and a predetermined amount is applied to the blanket. Since the tension is applied, the opening width of the groove opened on the outer peripheral surface of the blanket cylinder needs to have a dimension that allows the leading end member at the trailing end to be inserted after the leading end is inserted. Therefore, there is an advantage that when the blanket is mounted on the blanket cylinder, a gap formed between the leading end and the trailing end of the blanket can be reduced.

  However, this winding method has a problem that a large hollow portion must be formed inside the groove in order to accommodate the winding shaft around which the blanket is wound. Further, since this hollow portion must be formed near the outer peripheral surface of the blanket cylinder, the rigidity of the opening periphery of the groove is reduced, and the opening periphery is caused by the printing pressure from the plate cylinder, the printing pressure between the blanket cylinders, etc. Is prone to deformation and shortens the life of the blanket cylinder. Furthermore, there is also a drawback that when the running paper is rolled up, the peripheral edge of the opening is easily bent toward the inside of the groove.

  Furthermore, it is difficult to process the support hole for supporting the tip of the winding shaft with high accuracy, and there is a problem that the positional accuracy of the winding shaft is difficult to be obtained. In order to repair and replace the winding shaft, it is necessary to pull out the winding shaft in the axial direction of the blanket cylinder. There is also a problem that the blanket cylinder must be removed from the printing frame and repaired or replaced. Furthermore, since the axial length of the winding shaft is large, there is a problem that the winding shaft is easily bent and a uniform tension cannot be applied to the blanket.

The latter method can solve the above problems of the entrainment method,
Since it is necessary to insert the T-bar into the groove and engage the tip of the blanket and tighten the T-bar with a bolt, there is a problem that the groove opening width is required to insert at least the T-bar.
Moreover, there exists a thing described in patent document 1, for example as a blanket mounting apparatus other than the said system.
Japanese Utility Model Publication No. 58-58545

In this apparatus, a structure is formed in the axial direction of the blanket cylinder, and two pressers are disposed in the groove, and both ends of the blanket are individually pulled by the pressers. In this conventional apparatus, each presser foot is fastened with a plurality of bolts arranged at an appropriate interval in the axial direction of the blanket, so that the blanket can be pulled uniformly in the width direction.
However, in this conventional apparatus, since the two pressers must be stored in one groove, in order to prevent the two pressers from interfering with each other, each presser must be shaped like a comb. The both ends of the blanket must be formed in a predetermined shape in accordance with the shape of the presser foot, and there is a problem that the apparatus becomes expensive. Furthermore, since two pressers must be inserted into one groove, there is a problem that the width of the groove needs to be widened.

Therefore, in order to solve such a problem, a mounting device as described in Patent Document 2 has been proposed by the applicant of the present application.
FIG. 7 is a diagram illustrating the configuration of the blanket mounting device described in Patent Document 2.
A blanket 33 made of rubber or the like is wound around the outer peripheral surface of the blanket cylinder 39. A single groove 30 is formed in the blanket cylinder 39 by the width of the blanket 33 in the axial direction of the blanket cylinder 39 (direction perpendicular to the paper surface). The groove 30 has two branch grooves 32 and 32 that branch in two directions from the opening on the outer peripheral surface side of the blanket cylinder 39 toward the inside of the blanket cylinder 39. The angle β formed by both the branch grooves 32, 32 is not limited to a specific value, but is set to about 30 °, for example.

End members 34 and 34 are attached to both ends of the blanket 33 attached to the blanket cylinder 39, respectively. These tip members 34, 34 are inserted into the two branch grooves 32, one by one. The pressing members 31, 31 are disposed on the tip members 34, 34 inserted into the branch grooves 32, 32, respectively.
These pressing members 31, 31 have a substantially L-shaped cross section, and their shoulders come into contact with the corners of the tip members 34, 34. The pressing member 31 extends in the axial direction of the blanket cylinder 39, that is, in the direction perpendicular to the paper surface of FIG. 8, and a plurality of screw holes are formed at appropriate intervals. Bolts 37, 37 inserted through these screw holes mesh with screw locking members 35, 35 fixed to the bottoms of the respective branch grooves 32, 32.
With the above configuration, when the blanket 33 is slack, the slack can be removed by tightening one or both bolts 37.
Japanese Utility Model Laid-Open No. 3-19038 (see FIG. 2 and description on pages 10 and 11 of the specification)

  In the blanket mounting device having the above configuration, the groove opening width can be reduced as compared with the mounting device of Patent Document 1, and the gap between the leading end side and the trailing end side of the blanket 33 can be reduced. There is an advantage that you can. However, since the pressing members 31 and 31 are attached to the bolts 37 and 37 and the tip members 34 and 34 and the pressing members 31 and 31 are engaged on the sides of the shaft portions of the bolts 37 and 37, the pressing member 31 is There is a problem that it is necessary to increase the opening width of the groove 30 by an amount protruding from the bolt 37. Further, in the blanket mounting device having the above configuration, there is a problem in that it is difficult to make the gap between the leading end side and the trailing end side smaller than the bolt head when the blanket is mounted. There is.

  The present invention has been made to solve the above problems, and in a blanket mounting apparatus using a mounting method similar to those described in Patent Document 1 and Patent Document 2, the leading edge and the trailing edge of the blanket are provided. It is an object of the present invention to provide a blanket mounting device capable of minimizing the opening width of a groove into which an end is inserted and a mounting method thereof.

  In order to solve the above-mentioned problems, the inventors of the present invention have conducted intensive research, and as a result, engagement portions between the tip members at both ends of the blanket and members such as a tension bar and a pressing member that engage with the tip members. Is as close as possible to the axis of the fastening means such as a bolt, so that the opening width of the groove can be minimized, and the gap between the leading end side and the trailing end side of the blanket is more than ever. I thought I could make it smaller.

A blanket mounting device in a printing press according to the present invention is a blanket mounting device for attaching a blanket to a blanket cylinder with a tension bar , the blanket cylinder having a groove into which the tension bar is inserted, and the tension The bar has a base portion formed with a screw hole, and an engaging portion that is formed above the base portion and engages with a tip member attached to both ends of the blanket. The engaging portion of the tension bar is the screw A notch for inserting a bolt into the hole , and being inserted into a screw hole formed in the base of the tension bar , the head being more than the engaging portion of the engaging portion and the tip member. A bolt located on the center side of the blanket cylinder, a screw hole provided at the bottom of the groove, into which the bolt is screwed to fasten the tension bar; Formed on a part facing the outer circumferential surface of the bracket body on the inner wall surface of the groove, when the tip member of the blanket is inserted into the groove, a said tip member engageable with the engaging portion of the tension bar Formed at the boundary between the recessed relief groove leading to the position and the inner wall surface on the center side of the blanket cylinder from the recessed relief groove, and when the distal end member is further pushed in, the distal end member is guided between the center side of the inner wall surface of the blanket cylinder from the groove and the engagement portion, the distal end member and an inclined shaped guide surface for engaging the engaging portion, the tension bar inside the groove when fastened, the relief in contact one of the blanket of the tip member on the inner wall surface of the center of the blanket cylinder from abut groove, does not come off the engagement between the tip member of the blanket the tension bar Unishi was there as a constituent.
According to this structure, since the tension bar and the tip member of the blanket are engaged with each other on the outer peripheral surface side of the blanket with respect to the bolt, both engagement portions can be brought close to the axis of the bolt. Therefore, the opening width of the groove opened on the outer peripheral surface of the blanket cylinder can be minimized, and the gap between the leading end side and the trailing end side of the blanket can be made smaller than before.
Further, the tip member is inserted into the relief groove formed in a part of the inner wall surface of the groove, and the engagement portion of the tension bar that engages with the tip member is inserted into the relief groove. In a state where the tension bar and the tip member are engaged with each other, the tip member and the tension bar can be engaged with each other by the engagement portion by further pushing them into the groove.

  In the present invention, a single tension bar that engages both the leading end member and the trailing end member of the blanket is inserted into a single groove, and the tension bar is tightened in the groove. However, separate tension bars that engage the leading end member on the leading end side and the leading end member on the trailing end side may be inserted into the groove and individually tightened in the groove. . Then, by engaging the leading end side and the trailing end side with separate tension bars, the slack is removed by tightening either the leading end side or the trailing end side when the blanket is slack. be able to.

In the present invention, the engagement portion of the tension bar may be formed within a range not exceeding the maximum width of the bolt. By doing so, the groove opening width can be reduced to the maximum width of the bolt.
In the present invention, a plurality of bolts for fastening the tension bar can be provided, and a part of the plurality of bolts can be formed longer than the other bolts.
According to this configuration, when the longer bolt is screwed into the screw hole in the groove bottom portion, the screw portion of the shorter bolt eventually comes into contact with the tension bar and the groove bottom portion so that the longer bolt is removed. The screw cannot be screwed in any more and the tension bar is locked. This configuration is particularly effective when the blanket is mounted using two tension bars that engage with the respective tip members at both ends of the blanket. One of the tension bars is locked to engage the tip member with the tension bar. As a result, the engagement work between the other tension bar and the other tip member is facilitated, and the tension is easily adjusted.

Method of mounting the blanket in a printing machine of the present invention, insert the blanket ends of the distal end member in a groove formed in the blanket cylinder, pulling the blanket at a predetermined tension by fastening the tension bar, the blanket A blanket mounting method in a printing press for mounting a blanket cylinder to the blanket cylinder , wherein an engagement portion that engages the tension bar with a leading end member of the blanket is a bolt that fastens the tension bar to the bottom of the groove The engaging portion is inserted into the groove of the groove by inserting the bolt into the groove so as to be positioned radially outside the blanket cylinder with respect to the head of the groove, and screwing the bolt into the screw hole at the bottom of the groove. the tension bar so as to oppose the relief grooves of the concave formed in a part of the inner wall stop temporarily, by inserting the tip member to the groove By pushing the distal end member along said relief grooves, leads to the tip member to the engaged portion engageable with the position of the tension bar, then the tip member, the more the escape groove and the relief groove Pushed into the groove along the inclined guide surface on the center side of the blanket cylinder to engage with the engagement portion of the tension bar, and further engage the engagement portion of the tip member and the tension bar By tightening the bolt in a state in which it is held, the tip member is clamped between the inner wall surface on the center side of the blanket cylinder and the engaging portion from the escape groove, and a predetermined tension is applied to the blanket. Is given.

Further, the blanket mounting method in the printing press according to the present invention is such that, when the tip member is engaged with the engagement portion of the tension bar, as the bolt, a shaft portion and a head formed at one end of the shaft portion And a bolt having a screw part formed at an intermediate portion of the shaft part, and a screw hole penetratingly formed in the tension bar as the tension bar has a distance between the head of the bolt and the screw part. The bolt is screwed into the screw hole of the tension bar, the shaft part between the screw part and the head is inserted into the screw hole, and the bolt is inserted into the screw hole . Temporarily fixing the tension bar is performed by partially screwing the bolt into a screw hole formed at the bottom of the groove, and then engaging the tip member with the engagement portion of the tension bar. It is as.
Since the length of the screw hole of the tension bar is formed to be smaller than the distance between the head of the bolt and the screw part, even after the screw part of the bolt is screwed into the screw hole of the groove, this dimensional difference Only the tension bar will be movable relative to the bolt.
In other words, the tension bar can be temporarily fixed to the inside of the groove with a bolt in a state in which a movement amount necessary for engaging the tip member of the blanket and the tension bar is left, and the blanket can be easily attached. .

Further, the blanket mounting method in the printing machine of the present invention, when the front end member of the blanket end side and the front end member of the trailing end side are engaged with a separate tension bar and mounted on the blanket cylinder, Prepare a plurality of bolts with different shaft lengths, attach the shaft portions of the longer and shorter bolts into the screw holes of the tension bar, and place both tension bars in the groove. Inserting the longer bolt into the screw hole at the bottom of the groove to be in a first temporarily fixed state, engaging one of the tip members with one of the tension bars,
The longer bolt is tightened to the position where the one tension bar is locked with the shorter bolt to the second temporarily fixed state, and then the other tip member is engaged with the other tension bar. The long bolt and the short bolt are tightened to apply a predetermined tension to the blanket.

  According to the present invention, the rigidity of the opening edge is kept high, and when the printing pressure from the plate cylinder, the printing pressure between the blanket cylinders, or the sheet breakage occurs, the running paper is wound around the blanket cylinder and the groove opening periphery is deformed. Prevents damage and keeps the life of the blanket cylinder longer, makes it easier to repair and replace, and makes the gap between the leading and trailing ends of the blanket smaller than ever. Therefore, it is possible to effectively suppress the mechanical vibration and the loss of printing pressure and perform high-quality printing at high speed. In addition, since the configuration is simple, the apparatus price can be reduced.

[Embodiment of the Invention]
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view illustrating a configuration of a blanket mounting device according to an embodiment of the present invention, FIG. 2 is a front view of a tension bar, and FIG. 3 is a side view of the tension bar taken along the line II in FIG. FIG. 3A is a diagram for explaining details of the bolt attached to the tension bar, FIG. 3A shows a state before the bolt is inserted, and FIG. 3B shows a state after the bolt is inserted.

  As shown in FIG. 1, the blanket mounting device of this embodiment is formed in a blanket cylinder 9, a groove 10 into which a leading end and a trailing end of a blanket 13 are inserted, and a groove together with the leading end and the trailing end. 10 and a pair of tension bars 11, 11 that engage with the front end fittings 131, 131 respectively attached to the leading end and the trailing end of the blanket 13, and the tension bars 11, 11 are inserted into the groove 10. And a plurality of bolts 17 to be attached.

[Description of tension bar]
The tension bar 11 is formed to have substantially the same length as the width of the blanket 13. As shown in FIGS. 1 and 2, the tension bar 11 includes a base portion 111 inserted into the branch groove 12, and an engaging portion 112 that is formed above the base portion 111 and engages with a tip fitting 131 of the blanket 13. And a notch 113 for inserting a bolt 17 formed by cutting out a part of the engaging part 112 and a through screw hole 114 formed in the base 111 where the notch 113 is formed. is doing.

  As shown in FIG. 2, a plurality of notches 113 are formed at equal intervals at two locations near both ends of the tension bar 111 and at a plurality of locations in the middle of the tension bar 111. The engaging portion 112 is formed with two handle attachment holes 115 at equal distances from both ends of the tension bar 111, and a handle H that is gripped when the tension bar 111 is inserted into the groove 10. It can be attached.

  As shown in FIG. 3, the engaging portion 112 has a hook-like hooking portion 112 a that engages with a front end fitting 131 (indicated by a virtual line in FIG. 3) of the blanket 13. The closer to the axis C of the screw hole 114 (bolt 17), the better the engagement position between the tip fitting 131 and the hooking portion 112a is. However, a wrench is inserted into the wrench hole 171 formed in the head 172 of the bolt 17 described later. At this time, it is preferable that the position is slightly decentered from the axis C so that the wrench and the end fitting 131 of the blanket 13 do not interfere with each other.

The maximum thickness h of the tension bar 11 (the maximum dimension in the direction intersecting with the axis of the blanket cylinder 9, see FIG. 3A) is equivalent to the maximum width of the bolt 17. It is preferable to be within the range of the maximum width. In order to facilitate the engagement between the tip fitting 131 and the hooking portion 112a in the groove 10, it is preferable to form an inclined surface 112b at the upper end of the hooking portion 112a.
In FIG. 2, reference numeral 116 denotes through holes formed at a plurality of locations along the longitudinal direction of the tension bar 11 in order to reduce the weight of the tension bar 11.

[Description of bolts]
In this embodiment, the bolt 17 for applying a predetermined tension to the blanket 13 via the tension bar 11 and fixing the tension bar 11 and the blanket 13 in the groove 10 has two types of long and short as shown in FIG. Have been prepared. In the following description, when it is necessary to distinguish the length of the bolt 17, it is assumed that the longer bolt is denoted by reference numeral 17L and the shorter bolt is denoted by reference numeral 17S.

The bolt 17 includes a shaft portion 173, a head portion 172 provided at one end of the shaft portion 173, a hexagonal or square wrench hole 171, and a screw portion 174 partially formed at an intermediate portion of the shaft portion 173. And have. In this embodiment, the longer bolt 17L has both the shaft portion 173 and the screw portion 174 formed longer than the shorter bolt 17S. Further, the tip 173a of the shaft portion 173 may be formed in a hemispherical shape or a conical shape as illustrated in order to facilitate the engagement between the screw hole 121 and the tip of the shaft portion 173.
The bolt 17 is inserted into a screw hole 114 formed in the notch 113 of the tension bar 11 as shown in FIG.

The distance s from the head portion 172 of the bolt 17 to the upper end of the screw portion 174 is formed longer than the length s ′ of the screw hole 114, and the screw portion 174 is fully screwed into the screw hole 114. As shown in FIG. 3B, the screw portion 174 is detached from the screw hole 114 downward. As a result, the bolt 17 is movable with respect to the tension bar 11 while being inserted through the screw hole 114.
In order to prevent the upper end of the screw portion 174 of the bolt 17 through which the screw hole 114 is inserted from biting into the screw hole 114 of the tension bar 11, the bolt 17 is inserted into the screw hole 114 and then the shaft of the bolt 17 is inserted. A washer w or the like may be fitted between the portion 173 and the screw portion 174.

[Description of groove]
The groove 10 is formed in the same direction as the axis of the blanket cylinder 9 and has the same length as the width of the blanket 13. Further, two branch grooves 12, 12 that branch in two directions at a predetermined angle α toward the inside of the blanket cylinder 9 are formed from the middle portion of the groove 10. The base 111 of the tension bar 11 is fitted into the branch groove 12. A screw hole 121 is formed at the bottom of the branch grooves 12 and 12 in accordance with the position of the screw hole 114 of the base 111, and a bolt 17 inserted through the screw hole 114 is screwed into the screw hole 121.
Instead of forming the screw hole 121 at the bottom of the branch grooves 12, 12, a locking member as shown by reference numeral 35 in FIG. 7 is fixed to the bottom with a bolt or the like, and a screw hole is formed in the locking member. You may make it do.

A concave relief groove 102 is formed in a part of the inner wall surface 101 facing the groove 10 in the vicinity of the outer peripheral surface of the blanket cylinder 9 over the entire length of the groove 10. The escape groove 102 is for facilitating engagement between the leading end and the trailing end metal fitting 131 when the leading end 131 is inserted into the groove 10 and engaged with the hooking portion 112a of the tension bar 11. . As shown in FIG. 5 and the like, the escape groove 102 guides the tip fitting 131 from the relief groove 102 toward the engaging portion 112 when the tip fitting 131 is further pushed into the groove 10 at the upper and lower side edges thereof. An inclined guide surface 101a is formed.

  According to the blanket mounting device having the above configuration, as shown in FIG. 1, a pair of tension bars 11, 11 are inserted into the branch grooves 12, 12 of the groove 10, and are formed at a plurality of locations at the bottom of the branch grooves 12, 12. By tightening a plurality of bolts 17 into the screw holes 121 (or locking members), the pair of tension bars 11 and 11 are fixed in the groove 10.

  Further, the leading end fittings 131 and 131 at the leading end and the trailing end of the blanket 13 are engaged with the engaging portions 112 and 112 of the tension bars 11 and 11 in a state of being in contact with the inner wall surface 101 of the groove 10, respectively. The engagement between the end fittings 131 and 131 and the engaging portions 112 and 112 is performed at a position almost directly above the bolts 17 and 17 and close to the axis C of the bolts 17 and 17. The leading end and the trailing end can be brought close to each other, and when the blanket 13 is attached to the blanket cylinder 9, the gap between the leading end side and the trailing end side of the blanket 13 can be reduced. The gap need only have a dimension that allows a wrench to be inserted into the wrench holes 171 and 171 of the bolts 17 and 17 in a state where the tension bars 11 and 11 are inserted into the branch grooves 12 and 12.

[Explanation of installation procedure]
Next, a procedure for mounting the blanket 13 to the blanket cylinder 9 using the mounting apparatus having the above-described configuration will be described with reference to FIGS. 4 and 5.
As shown in FIG. 4A, the longer bolt 17L is screwed into the screw holes 114 formed at both ends of the tension bar 11, and the shorter bolt 17S is screwed into the other screw holes 114. Further, the handle H is inserted into the handle mounting hole 115 and attached. The bolts 17L and 17S are screwed into the screw holes 114 to the full, so that the bolts 17L and 17S can move in the screw holes 114 with respect to the tension bar 11.

  Next, as shown in FIG. 4B, the handle H is gripped and the tension bar 11 is inserted into the groove 10. Then, each tension bar 11 is inserted into the branch grooves 12 and 12 at the back of the groove 10, and the longer bolt 17 </ b> L is lightly screwed into the screw hole 121 at the bottom of the branch grooves 12 and 12. The degree of screwing is such that the hooking portion 112a of the tension bar 11 can move between the relief groove 102 of the groove 10 and the inner wall surface 101 below it.

In this state, the blanket 13 is wound around the outer peripheral surface of the blanket cylinder 9, the leading end metal fitting 131 is inserted into the groove 10, and is engaged with the engaging portion 112 of the tension bar 11. At this time, the clearance groove 102 formed in a part of the inner wall surface 101 of the groove 10 is used to engage the both.
FIG. 5 is an enlarged view of a main part for explaining a procedure until the front end fitting 131 of the blanket 13 is engaged with the engaging portion 112 of the tension bar 11 in the groove 10.
The tension bar 11 is lifted lightly in the groove 10 so that the hooking portion 112a of the engaging portion 112 faces the escape groove 102. In this state, the leading end fitting 131 on the leading end side is inserted toward the escape groove 102 from between the engaging portion 112 and the opening peripheral edge of the groove 10. At this time, since the inclined surface 112b is formed in the hooking portion 112a, the end fitting 131 can be smoothly inserted into the escape groove 102.

  Thereafter, the front end fitting 131 is pushed into the groove 10 until the rear end edge 131 a of the front end fitting 131 passes over the hooking portion 112 a positioned opposite to the escape groove 102. When the rear edge 131a exceeds the hooking portion 112a, the tension bar 11 is pushed into the groove 10 together with the tip fitting 131, and the hooking portion 112a and the tip fitting 131 are engaged. At this time, the inclined guide surface 101a formed at the boundary between the inner wall surface 101 and the clearance groove 102 guides the tip fitting 131 between the engaging portion 112 and the inner wall surface 101, and the hooking portion 112a and the tip fitting. Engagement with 131 is facilitated. Since the tip fitting 131 is positioned between the engaging portion 112 and the inner wall surface 101, the tip fitting 131 and the engaging portion 112 are not easily disengaged.

After the end fitting 13 and the engaging portion 112 are engaged by the above procedure, a wrench is inserted from the opening of the groove 10 and engaged with the wrench hole 171 of the head 172 of the bolt 17L, and both ends of the tension bar 11 are engaged. The longer bolt 17L on the side is tightened evenly.
When the longer bolt 17L is tightened to a certain depth, the top and bottom of the screw portion 174 of the bolt 17S are engaged with the tip of the shaft portion 173 of the shorter bolt 17S engaged with the screw hole 121 at the bottom of the branch groove 12. Both ends abut against the bottom of the branch groove 12 and the base 111 of the tension bar 11, respectively. Thereby, the movement of the tension bar 11 is restricted, and the tension bar 11 is temporarily fixed in the groove 10.

  After the temporary fastening of the tension bar 11 on the leading end side, the handle H is removed from the tension bar 11. Then, the blanket cylinder 9 is rotated once so that the blanket 13 is wound around the blanket cylinder 9, and the end fitting 131 on the trailing end side of the blanket 13 is inserted into the groove 10. Thereafter, the trailing end side end fitting 131 and the engaging portion 112 of the tension bar 11 are engaged with each other by the same procedure as described above, and the longer bolt 17L is tightened to tighten the rear end side tension bar 11. Is temporarily fixed in the groove 10. Thereafter, a predetermined tension is applied to the blanket 13 while the bolts 17L and 17S of the tension bar 11 on the leading end side and the trailing end side are uniformly tightened into the screw holes 121 using a torque wrench or the like. And attach it to the blanket cylinder 9.

[Other Embodiments]
Another embodiment of the present invention will be described with reference to FIG. In the following description, the same parts and members as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the above-described embodiment, two tension bars 11 are inserted into the groove 10, and separate tension bars 11 are engaged with the leading end fitting and the trailing end fitting of the blanket 13, respectively. In this embodiment, a single tension bar is inserted into the groove, and the leading end fitting and the trailing end fitting are engaged with the single tension bar.

  The groove 20 is formed with the same length as the width of the blanket 13 in the same direction as the axis of the blanket cylinder 9. Further, the groove 20 extends straight from the outer peripheral surface of the blanket 9 toward the center of the blanket 9, and relief grooves 202, 202 are formed in the vicinity of the outer peripheral surface of the blanket 9 on the opposed inner wall surfaces 201, 201. . Further, a screw hole 221 into which the screw part 174 of the bolt 17 is screwed is formed at the bottom of the groove 20.

The tension bar 21 includes a base 211 formed to have a length substantially the same as the width of the blanket 13, an engagement portion 212 formed above the base 211, and a part of the engagement portion 212. A notch part 213 for inserting the bolt 17 and a bolt hole 214 into which the bolt 17 is screwed are formed.
About the arrangement position of the notch part 213, it is the same as that of previous embodiment demonstrated referring FIG. Although not specifically shown, also in this embodiment, the handle 212 has two handle attachment holes for attaching the handle H.

The engaging portion 212 has hook-like hook portions 212a formed on both sides of the blanket 9 in the rotational direction, and one hook portion 212a engages with the tip fitting 131 on the leading end side of the blanket 13 and the other hook portion. The portion 212a is adapted to engage with the end fitting 131 on the trailing end side. As in the previous embodiment, when the wrench is inserted into the wrench hole 171 in the head of the bolt 17, the engagement position between the end fittings 131, 131 and the hooking portions 212 a, 212 a is the same as that of the previous embodiment. This is a position slightly decentered from the axis C so as not to interfere with the tip fitting 131.
Further, the upper end of the engaging portion 212 is formed as a tapered surface 212b to facilitate the engagement between the tip fitting 131 and the hooking portion 212a in the groove 20.

  The front end fittings 131 and 131 at the leading end and the trailing end of the blanket 13 are engaged with the two hooking portions 212a and 212a of the tension bar 21, respectively. Is located between. Since the engagement between the end fittings 131 and 131 and the hooking portions 212a and 212a is performed almost directly above the bolts 17 and 17 and close to the axis C of the bolts 17 and 17, the leading edge of the blanket 13 is reached. The end and the trailing end can be brought close to each other, and therefore the gap between the leading end side and the trailing end side of the blanket 13 can be reduced. Also in this embodiment, the gap between the leading end side and the trailing end side of the blanket 13 only needs to have a dimension that allows a wrench to be inserted into the wrench holes 171 and 171 of the bolts 17 and 17.

In the mounting device of this embodiment, as described with reference to FIG. 4B in the previous embodiment, after the handle is gripped and the tension bar 21 is inserted into the groove 20, the engaging portion of the tension bar 21 is engaged. The longer bolt 17L is lightly screwed into the screw hole 221 at the bottom of the groove 20 so that the hooking portion 212a of 212 can move between the escape groove 202 of the groove 20 and the inner wall surface 201 below the groove.
Then, the end fittings 131, 131 at both ends of the blanket 13 are inserted into the escape grooves 202, 202, respectively, and the engagement fitting 212 is pushed into the groove 20 together with the tension bar 21, while the tip fittings 131, 131 and the hooking portions 212 a, 212a is engaged.
Thereafter, the longer bolt 17 and the shorter bolt 17 are evenly tightened, and the blanket 13 is mounted on the blanket cylinder 9 while adjusting the tension of the blanket 13.

Although a preferred embodiment of the present invention has been described, the present invention is not limited to the above description.
For example, in the above description, the longer bolt is attached to both ends of the tension bar and the shorter bolt is arranged between them, but the arrangement of both bolts is not limited to the above.
In the above description, a bolt is taken as an example of the fastening means, and the bolt is fastened into a screw hole at the bottom of the groove, which is the fastening means. However, the fastening means is attached to the bottom of the groove. May be erected, and a nut as a fastening means may be fastened to the bolt.
Further, in the above description, the tension bars 11 and 21 are inserted into the grooves 10 and 20 using the handle H. However, if the insertion work into the grooves 10 and 20 is facilitated, the handle H may be Not limited to this, other tools may be used.

  The present invention can be applied to all types of rotary printing presses that perform printing by mounting a blanket on a blanket cylinder.

It is a side view explaining composition of a blanket mounting device concerning one embodiment of the present invention. It is a front view of a tension bar. FIG. 3A is a side view of the tension bar taken along the line II in FIG. 2 and a diagram illustrating details of the bolts attached to the tension bar. FIG. 3A shows a state before the bolts are inserted. ) Shows the state after the bolt is inserted. It is a figure explaining the mounting procedure of the blanket to the blanket cylinder using the blanket mounting apparatus of this embodiment. It is an enlarged view of the principal part explaining a procedure until it engages the front-end metal fitting of a blanket with the engaging part of the tension bar in the groove. It is a figure explaining other embodiment of this invention, and is a side view which shows the state which mounted | wore the blanket cylinder. It is a figure explaining the structure of the blanket mounting apparatus described in patent document 2 concerning the prior art example of this invention.

Explanation of symbols

9 Blanket 10 Groove 101 Inner wall surface 101a Guide surface 102 Relief groove 11 Tension bar 111 Base portion 112 Engagement portion 112a Hook portion 112b Inclined surface 113 Notch portion 114 Bolt hole 12 Branch groove 121 Screw hole 13 Blanket 131 Tip fitting (tip member)
17 Bolt 171 Wrench hole 172 Head 173 Shaft 174 Screw

Claims (6)

A blanket mounting device for attaching a blanket to a blanket cylinder with a tension bar ,
The blanket cylinder has a groove into which the tension bar is inserted ,
The tension bar has a base portion in which a screw hole is formed, and an engaging portion that is formed above the base portion and engages with tip members attached to both ends of the blanket ,
The engagement portion of the tension bar has a notch for inserting a bolt into the screw hole ,
And a bolt that is inserted into a screw hole formed in a base portion of the tension bar, and whose head is positioned closer to the center side of the blanket cylinder than the engaging portion between the engaging portion and the tip member,
A screw hole provided at the bottom of the groove and screwed into the bolt to fasten the tension bar;
It is formed in a part of the inner wall surface of the groove facing the outer peripheral surface of the bracket body, and when the leading end member of the blanket is inserted into the groove, the leading end member can be engaged with the engaging portion of the tension bar. A concave relief groove leading to a different position ,
It is formed at the boundary portion between the concave relief groove and the inner wall surface on the center side of the blanket cylinder from the relief groove, and when the tip member is further pushed in, the tip member is located on the center side of the blanket cylinder from the relief groove. An inclined guide surface that guides between the wall surface and the engaging portion and engages the tip member and the engaging portion ,
When the tension bar is fastened inside the groove, one end of the blanket comes into contact with the inner wall surface on the center side of the blanket cylinder from the escape groove, and the blanket tip member and the tension bar To prevent disengagement,
A blanket mounting device for a printing press.   2. The blanket mounting device for a printing press according to claim 1, wherein the engagement portion of the tension bar is formed within a range not exceeding the maximum width of the bolt.   The blanket for a printing press according to claim 1 or 2, wherein a plurality of bolts for fastening the tension bar are provided, and a part of the plurality of bolts is formed longer than the other bolts. Mounting device. Insert the tip of the blanket ends in a groove formed in the blanket cylinder, pulling the blanket by fastening the tension bar at a predetermined tension, of the blanket in a printing machine for mounting the blanket on the blanket cylinder A mounting method,
The groove so that the engaging portion that engages the tension bar with the tip member of the blanket is positioned on the radially outer side of the blanket cylinder with respect to the head of the bolt that fastens the tension bar to the bottom of the groove. Insert inside
And , by screwing the bolt into the screw hole at the bottom of the groove, the tension bar is temporarily fixed so that the engaging portion faces a concave relief groove formed in a part of the inner wall surface of the groove. And
By inserting the tip member into the groove and pushing the tip member along the escape groove, the tip member is guided to a position where it can be engaged with the engagement portion of the tension bar,
Next, the tip member is pushed into the groove along the guide groove on the center side of the blanket cylinder from the escape groove and the escape groove, and is engaged with the engagement portion of the tension bar,
Further, by tightening the bolt in a state where the tip member and the engagement portion of the tension bar are engaged, the tip member is connected to the inner wall surface on the center side of the blanket cylinder from the escape groove and the bolt. Sandwiching between the engaging portion and applying a predetermined tension to the blanket;
A blanket mounting method in a printing machine characterized by the above. When engaging the tip member with the engagement portion of the tension bar,
As the bolt, a bolt having a shaft portion, a head portion formed at one end of the shaft portion, and a screw portion formed at a midway portion of the shaft portion is used.
As the tension bar, a screw hole penetratingly formed in the tension bar is shorter than the distance between the head of the bolt and the screw part.
The bolt is screwed into the screw hole of the tension bar, and the shaft part between the screw part and the head is inserted into the screw hole,
The temporary fixing of the tension bar in the groove, performs the bolt partly screwed to the screw holes formed in the bottom of the groove,
Thereafter, engaging the tip member with the engagement portion of the tension bar ;
A blanket mounting method for a printing press according to claim 4. When attaching the leading end member on the leading end side and the leading end member on the trailing end side of the blanket to the separate tension bar and attaching to the blanket cylinder,
Preparing a plurality of the bolts with different lengths of the shaft,
The longer and shorter bolt shafts are screwed into the screw holes of the tension bar and attached,
Both tension bars are inserted into the groove, and the longer bolt is partially screwed into the screw hole at the bottom of the groove to obtain a first temporarily fixed state,
One of the tip members is engaged with one of the tension bars,
Tighten the longer bolt to the position where the one tension bar is locked with the shorter bolt to the second temporarily fixed state,
After that, the other tip member is engaged with the other tension bar,
Tightening the longer bolt and the shorter bolt to apply a predetermined tension to the blanket;
A method for mounting a blanket in a printing press according to claim 5.

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