JP2021074904A - Blanket cylinder, printing unit and web offset press - Google Patents

Abstract

To support attachment of a metal-back blanket to a blanket cylinder.SOLUTION: A blanket cylinder comprises: a blanket cylinder main body having a groove for attaching a blanket extending along an axial direction formed therein; a metal-back blanket that is attached to an outer peripheral surface of the blanket cylinder main body, with a gripping-side end part formed at an edge part at one end side in a longitudinal direction and a gripping rear-side end part formed at an edge part at the other end side in the longitudinal direction inserted into the groove for attaching the blanket; and slip-out preventing means that prevents the gripping-side end part inserted into the groove for attaching the blanket from coming out from the groove for attaching the blanket.SELECTED DRAWING: Figure 6

Description

The present invention relates to a blanket cylinder, a printing unit and an offset rotary printing press.

The printing unit used in the offset rotary printing press for newspaper printing is equipped with an ink supply device that supplies ink, a dampening water supply device that supplies dampening water, a plate cylinder on which a printing plate is mounted, and a blanket. It is equipped with a blanket body to be printed. In this printing unit, the ink supplied from the ink supply device is supplied to the blanket cylinder via the plate cylinder, and the blanket cylinder comes into contact with the running continuous paper at a predetermined pressure to print on the continuous paper. It is configured so that the contents (characters, images, etc.) are transferred.

Types of blankets attached to the blanket body of such a printing unit include a normal blanket and a metal back blanket. The normal blanket is formed by laminating an elastic layer on a base fabric layer. The metal back blanket is formed by laminating a blanket layer (rubber layer or cloth layer) on a base metal (for example, a stainless steel plate having a thickness of 0.2 mm) (see, for example, Patent Document 1).

The metal back blanket is attached to the blanket body with the base metal on the inner peripheral side and the blanket layer on the outer peripheral side. The length of the base metal is longer than the length of the blanket layer, and the blanket layer is not formed (laminated) at both end edges of the base metal in the longitudinal direction. In order to attach the metal back blanket to the blanket body, as a preliminary preparation, a metal back blanket bender, which is a dedicated bending machine, is used to prepare both ends of the base metal in the longitudinal direction, that is, the portion where the blanket layer is not laminated. It is necessary to bend it to form a mouth-to-mouth end and a mouth-to-mouth end. As described above, the grip side end portion and the grip end side end portion of the metal back blanket are thin because they are composed only of the bent base metal.

The metal back blanket on which the gripping side end and the gripping buttock side end are formed in this way is attached to the blanket body according to the following procedure.
(1) The blanket body is formed with a blanket mounting groove in which both end edges of the blanket (the gripping side end and the gripping buttock side end) can be inserted, and the inside of the blanket mounting groove. Is formed with a storage space capable of accommodating the blanket mounting device.
(2) The grip side end of the metal back blanket is inserted into the blanket mounting groove and engaged with the grip edge formed on the rear side in the rotational direction with respect to the blanket mounting groove.
(3) While holding the grip side end of the metal back blanket in a state of being engaged with the grip edge, rotate the blanket body and wind the metal back blanket around the outer peripheral surface of the blanket body. .. During this winding work, the operator presses the metal back blanket against the blanket cylinder while applying appropriate tension by hand so that the metal back blanket does not rise from the outer peripheral surface of the blanket cylinder, and the metal back blanket is pressed against the blanket cylinder. Wrap it around the outer peripheral surface of the.
(4) After the end of the buttock side reaches a position where it can be inserted into the blanket mounting groove, the rotation of the blanket body is stopped.
(5) The mouth end is inserted into the blanket mounting groove, and the mouth end is towed and tightened by the blanket mounting device. As a result, the metal back blanket can be mounted on the outer peripheral surface of the blanket body in a state of being evenly stretched.

The blanket body is made of, for example, forged steel having excellent rigidity, and the outer peripheral surface thereof is plated with hard chrome or welded with stainless steel in order to improve corrosion resistance.

As described above, the metal back blanket is a non-stretchable blanket because it has a base metal. The use of such a non-stretchable metal back blanket has an advantage that the reproducibility of halftone dots is good and a sharp and beautiful paper surface can be provided.

In addition, the grip side end and the grip side end of the metal back blanket are thin. Therefore, as the blanket mounting groove (gap) formed in the blanket body, a narrow gap having a narrowed gap width can be adopted. Since the blanket mounting groove (gap) is the main source of vibration during printing, the generation of vibration can be suppressed by making the gap a narrow gap. Since the occurrence of vibration can be suppressed in this way, fluctuations in printing pressure can be suppressed, the occurrence of printing problems such as shock stitches and doubling can be suppressed, and the paper quality is improved. The shock stitch means that white spots extending in the horizontal direction (width direction) of the paper surface are intermittently generated in the vertical direction of the paper surface, and a striped pattern of light and shade is generated.

Furthermore, the metal back blanket has a longer life than the normal blanket, and the blanket has significantly less settling. When the blanket is exhausted, it must be replaced with a new blanket, but the metal back blanket has a long life and less settling, so the replacement cycle is long. As a result, the adoption of the metal back blanket has an advantage that the replacement work time can be reduced, the printing stop time associated with the replacement work can be reduced, and the cost associated with the replacement work can be reduced accordingly.

JP-A-2009-196269

By the way, since both the base metal of the metal back blanket (for example, stainless steel) and the outer peripheral surface of the blanket body (for example, forged steel) are made of metal, the contact resistance between the two is small and slippery. Therefore, when the metal back blanket is attached to the blanket cylinder, or when printing is performed after the metal back blanket is attached to the blanket cylinder, the metal back blanket may be displaced from the blanket cylinder.

Therefore, conventionally, when mounting the metal back blanket on the blanket body, that is, the gripping side end of the metal back blanket is engaged with the gripping edge of the blanket mounting groove, and the blanket body is rotated. When winding the metal back blanket, it was necessary for a plurality of workers to press the gripping side end portion and the vicinity portion thereof against the outer peripheral surface of the blanket body to hold the metal back blanket so as not to be displaced. For this reason, conventionally, a large number of workers have been required to attach the metal back blanket to the blanket body.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a blanket cylinder, a printing unit, and an offset rotary printing press capable of supporting the attachment of a metal back blanket to the blanket cylinder. To provide.

The blanket body according to the present invention includes a blanket body body having a blanket mounting groove extending along the axial direction, a gripping side end portion formed on one end side in the longitudinal direction, and a gripping side end portion in the longitudinal direction. A metal back blanket to be mounted on the outer peripheral surface of the blanket body body and a groove for mounting the blanket in a state where the end portion on the side of the buttock formed on the edge portion on the end side is inserted into the groove for mounting the blanket. It is characterized by having a pull-out preventing means for preventing the gripping side end portion inserted into the blanket from slipping out from the blanket mounting groove.

The pull-out prevention means for the blanket body according to the present invention is provided in the engaging hole formed at the gripping side end of the metal back blanket and inside the blanket mounting groove, and is provided in the engaging hole. It may have an engageable protrusion.

By inserting the blanket body according to the present invention into the blanket mounting groove, the gripping side end portion can be sandwiched between the gripping side wall surface forming the blanket mounting groove. It may be an insertion member.

The printing unit according to the present invention supplies the above-mentioned blanket cylinder, a plate cylinder provided with a printing plate, an ink supply device for supplying ink to the blanket cylinder via the plate cylinder, and dampening water to the plate cylinder. It is characterized by being provided with a dampening water supply device.

In the offset rotary printing press according to the present invention, the above-mentioned printing unit, a paper feeding unit for mounting a roll of continuous paper, and the continuous paper printed by the printing unit are cut and folded for signature. It is characterized by having a fold portion forming the above.

According to the present invention, it is possible to support the attachment of the metal back blanket to the blanket body.

It is a block diagram which shows the printing part which includes the printing unit which concerns on this embodiment. It is a block diagram which shows the blanket body which concerns on this embodiment. It is a block diagram which shows the part A of FIG. 2 enlarged. It is a block diagram which shows the metal back blanket. It is a B arrow view of FIG. It is a block diagram which shows the state which the insertion fixing member is inserted into the groove for mounting a blanket. It is a block diagram which shows the state which the holding side end part was engaged with the holding edge. It is a perspective view which shows the state which the metal back blanket is attached to the blanket body body. It is a block diagram which shows the state which the wedge member is inserted into the groove for mounting a blanket. It is a block diagram which shows the state which attaches a metal back blanket to a blanket body body while rotating a blanket body body in a forward rotation direction. It is a block diagram which shows the state which attaches the metal back blanket to the blanket body body while rotating the blanket body body in the reverse rotation direction.

Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the means for solving the invention. ..

[Overall configuration of offset rotary printing press]
The offset rotary printing press according to the present embodiment includes a paper feed unit (not shown), a plurality of printing units (the configuration thereof will be described later), a rail frame portion (not shown), and a folded portion (not shown). ), A post-processing mechanism (not shown), a control unit (not shown), and a setting input unit (not shown).

The paper feed unit is equipped with a roll of continuous paper. The printing unit performs offset printing on both sides of the continuous paper supplied from the paper feed unit. The rail frame portion forms a traveling path of continuous paper from the printing portion to the folded portion. The folded portion is formed by cutting a continuous paper after offset printing and folding a single sheet or a group of sheet sheets composed of a plurality of sheet sheets to form a signature. The post-treatment mechanism performs a predetermined process on the signature formed by the folded portion and accumulates the signature. The control unit executes various controls of each configuration. The setting input unit inputs various setting information. In the offset rotary printing press according to the present embodiment, various known ones can be arbitrarily used as the paper feed unit, the rail frame unit, the folding unit, the post-processing mechanism, the control unit, and the setting input unit. Is omitted.

[Structure of printing section]
As shown in FIG. 1, the printing unit 1 is a color (cyan in the present embodiment) including four printing units (first printing unit 1a to fourth printing unit 1d) arranged along the supply direction of continuous paper. , Magenta, yellow and black) This is a tower-type printing unit that supports printing. The printing unit 1 does not have to be a tower-type printing unit for color printing in which all the printing units 1 installed in the offset rotary printing press are composed of four printing units 1a to 1d, and some or all of them need to be It may be a printing unit for single-color or two-color printing consisting of only one or two printing units.

The first printing unit 1a to the fourth printing unit 1d are an ink supply device 11 having a large number of ink supply rollers, a dampening water supply device 12 for supplying dampening water, and a plate cylinder 13 having a printing plate, respectively. A blanket cylinder 100 including a metal back blanket, which is a blanket for printing, is provided with a printing couple arranged in pairs on the left and right sides of continuous paper. In the first printing unit 1a to the fourth printing unit 1d, similarly to the conventional printing unit, the ink supplied from each ink supply device 11 is used for printing the blanket cylinder 100 via the printing plate of each plate cylinder 13. It is configured so that the contents of the printing plate (characters, images, etc.) are transferred to the continuous paper when the printing blanket, which is supplied to the blanket, comes into contact with the running continuous paper (printed object) at a predetermined pressure. There is.

The plate cylinder 13 has a linear printing plate mounting groove extending along the axial direction, and is configured to include a plurality of printing plates along the axial direction. For example, the plate cylinder 13 according to the present embodiment has an axial length (W) substantially equal to four times the horizontal length of one newspaper page and a circumferential length substantially equal to the vertical length of one newspaper page. It is a so-called 4 (W) × 1 (L) type plate cylinder having a length (L) of. The plate cylinder 13 is not limited to the 4 (W) × 1 (L) type plate cylinder, and various plate cylinders such as a so-called 4 (W) × 2 (L) type plate cylinder can be used. It is possible. In the offset rotary printing press according to the present embodiment, various known ink supply devices 11, the dampening water supply device 12, and the plate cylinder 13 can be arbitrarily used, and thus the description thereof will be omitted.

[Outline structure of blanket body]
The detailed configuration of each part of the blanket cylinder 100 will be described later, but the schematic configuration of the blanket cylinder 100 is as follows. That is, the blanket body 100 includes a blanket body body 110 in which a blanket mounting groove 111 extending along the axial direction is formed, a grip side end portion 121a formed in an end edge portion on one end side in the longitudinal direction, and a gripping side end portion 121a in the longitudinal direction. A metal back blanket 120 mounted on the outer peripheral surface of the blanket body 110 and a blanket in a state where the gripping tail side end portion 121b formed on the other end side of the blanket is inserted into the blanket mounting groove 111. It has a pull-out preventing means for preventing the gripping side end portion 121a inserted into the mounting groove 111 from coming out of the blanket mounting groove 111. The extraction preventing means includes a first extraction preventing means including an engaging pin 140 shown in FIG. 3 and an engaging hole 130 formed in the gripping side end portion 121a shown in FIG. 5, and a second extraction preventing means shown in FIG. It is provided with an insertion fixing member 150 which is an extraction preventing means.
The detailed configuration of each part of the blanket body 100 will be described below.

[Structure of blanket body and metal back blanket]
As shown in FIG. 2, the blanket body 100 includes a columnar blanket body 110 and a metal back blanket 120 mounted on the outer peripheral surface of the blanket body 110. The blanket body 110 has an axial length (W) that is approximately equal to four times the horizontal length of one newspaper page and a circumferential length that is approximately equal to twice the vertical length of one newspaper page. It is a so-called 4 (W) × 2 (L) type rotating body (double body) having a (L). Two metal back blankets 120 are arranged side by side in the axial direction of the blanket body 110 and are mounted on the outer peripheral surface of the blanket body 110.

As shown in FIG. 3 in which the A portion of FIG. 2 is enlarged, the blanket body body 110 is formed with a blanket mounting groove 111 that extends linearly along the axial direction and opens on the outer peripheral surface of the blanket body body 110. ing. Two of the blanket mounting grooves 111 are formed in one blanket body body 110. That is, the first blanket mounting groove 111 has a length of 1/2 of the axial length of the blanket body 110, and extends from one end of the blanket body 110 to the center (intermediate position). ing. The second blanket mounting groove 111 has a length of 1/2 of the axial length of the blanket body body 110, and extends from the other end of the blanket body body 110 to the central portion (intermediate position). There is. Moreover, the first and second blanket mounting grooves 111 are formed so as to be displaced by 180 ° in the circumferential direction, and are so-called 180 ° staggers. The groove width (circumferential length) of the blanket mounting groove 111 is several mm (for example, 2 mm).

The blanket body 110 is formed with a storage space 112 that communicates with the blanket mounting groove 111. The accommodation space 112 is provided with a blanket mounting device 113. Note that FIG. 3 shows only the winding shaft 113a of the blanket mounting device 113. A slit groove 114 is formed in the winding shaft 113a.

Assuming that the rotation direction of the blanket body body 110 at the time of printing is the forward rotation direction α, the portion of the blanket body body 110 located behind the blanket mounting groove 111 in the forward rotation direction α is the gripping edge portion. It is 115. The gripping edge portion 115 has an acute angle between the gripping side wall surface 111a on the gripping edge portion 115 side and the outer peripheral surface of the blanket body 110 among the gripping side wall surfaces forming the blanket mounting groove 111. It is configured to be.

FIG. 4 shows the metal back blanket 120 before being attached to the blanket body 110. In FIG. 4, the thickness of the metal back blanket 120 is drawn thicker than the actual thickness for easy understanding. As shown in the figure, the metal back blanket 120 is a sheet-like member formed by laminating a blanket layer 122 on a base metal 121. The length of the base metal 121 is longer than the length of the blanket layer 122, and the blanket layer 122 is not laminated on both end edges of the base metal 121 in the longitudinal direction. Then, the end edge portion on one end side in the longitudinal direction of the base metal 121 is bent to form the grip side end portion 121a, and the end edge portion on the other end side of the base metal 121 is bent to hold the grip. The buttock side end 121b is formed. The "length" and "longitudinal direction" of the base metal 121 and the blanket layer 122, that is, the "length" and "longitudinal direction" of the metal back blanket 120 refer to the metal back blanket 120 as the outer circumference of the blanket body 110. It means a "length" or a "direction" corresponding to a "length along the circumferential direction" or a "direction along the circumferential direction" when mounted on a surface.

[Structure of engagement hole and engagement pin as first extraction prevention means]
As shown in FIG. 5 which is a view taken along the arrow B of FIG. 4, three engaging holes 130 are formed in the gripping side end portion 121a of the base metal 121 so as to be separated from each other in the width direction of the base metal 121. There is. That is, the engaging holes 130 are formed at both end positions in the width direction and the center position in the width direction of the base metal 121 (holding side end portion 121a). In the present embodiment, one of the engaging holes 130 is a round hole and two are long holes. However, even if the number of round holes is two and one long hole is used, or if all the holes are round holes, all of them are all round holes. It may be a long hole.

Returning to FIG. 3, the blanket body 100 further includes an engaging pin 140 attached to the blanket body body 110. The engaging pin 140 is attached in a state of being embedded in the blanket body body 110, and the pin tip of the engaging pin 140 is several mm (for example, 0. 5 mm) It is protruding. In the present embodiment, three engaging pins 140 are provided apart from each other in the axial direction. Further, when the gripping side end portion 121a of the metal back blanket 120 is engaged with the gripping edge portion 115, the pin tips (projections) of the three engaging pins 140 are formed on the gripping side end portion 121a. The arrangement positions of the engagement pin 140 and the engagement hole 130 are set so as to be inserted into and engaged with the three engagement holes 130.

The first extraction is performed by the three engaging holes 130 formed in the gripping side end portion 121a of the base metal 121 and the pin tips (projections) of the three engaging pins 140 provided in the blanket body body 110. An output prevention means is configured. The number of engaging holes 130 and engaging pins 140 is not limited to three, and may be one, or any number of two or more. Further, on the outer peripheral surface of the blanket body body 110, a mark indicating the arrangement position (arrangement position along the axial direction) of the engagement pin 140 may be marked on the portion close to the blanket mounting groove 111. If a mark indicating the arrangement position of the engaging pin 140 is attached, the work of inserting the tip of the engaging pin 140 into the engaging hole 130 and engaging with the engaging pin 140 can be easily performed as described later. The mark may be, for example, a marking line drawn with a marking needle.

[Structure of insertion fixing member as second extraction prevention means]
The blanket body 100 of the present embodiment further includes an insertion fixing member (insertion member) 150 as shown in FIG. The insertion fixing member 150 is a plate member having an arbitrary shape and size. For example, the width (length in the axial direction) is 50 mm, the length (length in the circumferential direction) is 100 to 150 mm, and the thickness is 1. It is a 5 mm plate member. The insertion fixing member 150 has a bent plate shape or a flexible plate shape that can be bent, and is formed in a fixing portion 150a magnetically attached to the outer peripheral surface of the blanket body 110 and in the blanket mounting groove 111. It has an insertion portion 150b to be inserted. The fixing portion 150a of the insertion fixing member 150 is formed by a magnet. The insertion portion 150b of the insertion fixing member 150 has a thickness that fills (eliminates) the gap between the insertion portion 150b and the blanket mounting groove 111 when inserted into the blanket mounting groove 111. Therefore, as shown in FIG. 6, when the fixing portion 150a is magnetically attached to the outer peripheral surface of the blanket body body 110 and the insertion portion 150b is inserted into the blanket mounting groove 111, the insertion portion 150b inserts the gripping side end portion 121a. It is configured to be pressed against the top side of the gripping edge portion 115 and to sandwich the gripping side end portion 121a with the gripping side wall surface 111a.

The insertion / fixing member 150 is not limited to the one formed entirely of magnets. For example, a lower surface layer formed of a magnet and an upper surface layer formed of a member having a higher coefficient of friction than the lower surface layer (for example, nitrile rubber, urethane rubber, silicone rubber, fluororubber, etc., which are resin-based materials). The insert-fixing member may be formed by a plate-shaped member to which the rubber is joined. In the insertion fixing member having such a configuration, when the member on the upper surface side is magnetically attached to the blanket body body 110 by the magnet on the lower surface layer, the member on the upper surface side holds the gripping side end portion 121a and the top portion of the edge portion 115. It is configured to be pressed to the side and to sandwich the grip side end portion 121a with the grip side wall surface 111a.

[Procedure for installing metal back blanket, etc.]
Here, a procedure for attaching the metal back blanket 120 to the blanket body 110 and the like will be described.

(1) As shown in FIG. 7, the grip side end portion 121a of the metal back blanket 120 is inserted into the blanket mounting groove 111 and engaged with the grip edge portion 115. Further, the pin tips of the three engaging pins 140 are inserted into and engaged with the three engaging holes 130. In this way, the grip side end portion 121a is engaged with the grip edge portion 115, and the pin tip of the engagement pin 140 is inserted into the engagement hole 130 to engage the grip, so that the grip of the metal back blanket 120 is engaged. The side end portion 121a is tightly engaged and fixed to the gripping edge portion 115.

In this case, if the engaging hole 130 is a long hole, the pin tip of the engaging pin 140 can be easily inserted into the engaging hole 130. Further, since the engagement pin 140 and the engagement hole 130 are arranged not only at both end positions in the width direction of the metal back blanket 120 but also at the center position, the engagement pin 140 and the engagement hole 130 are arranged not only at both end positions in the width direction of the metal back blanket 120 but also at the center. Even at the position, the gripping side end portion 121a can be fixed in close contact with the gripping edge portion 115 without creating a gap between the metal back blanket 120 and the outer peripheral surface of the blanket body body 110.

(2) Next, as shown in FIGS. 6 and 8, the fixing portion 150a of the insertion fixing member 150 is magnetically attached to the outer peripheral surface of the blanket body body 110, and the insertion portion 150b is inserted into the blanket mounting groove 111. To do. In this case, as shown in FIG. 8, for example, the three insertion / fixing members 150 are arranged apart in the axial direction. By arranging the insertion fixing member 150 in this way, the insertion portion 150b can press the grip side end portion 121a toward the top of the grip edge portion 115. Therefore, the grip side end portion 121a of the metal back blanket 120 is firmly sandwiched between the grip portion 150b and the grip edge portion 115 (the grip side wall surface 111a), and is tightly sandwiched by the grip edge portion 115. Engage and fixedly supported.

If a mark indicating the arrangement position (arrangement position along the axial direction) of the insertion fixing member 150 is attached to the portion of the outer peripheral surface of the blanket body 110 near the blanket mounting groove 111, the insertion fixing member 150 Can be easily arranged. As the arrangement position of the insertion fixing member 150, for example, the position where the engagement pin 140 is arranged can be set. The mark may be, for example, a marking line drawn with a marking needle.

As described above, the gripping side end portion of the metal back blanket 120 is provided by the engaging hole 130 and the engaging pin 140, which are the first extraction preventing means, and the insertion fixing member 150, which is the second extraction preventing means. The 121a can be fixedly supported by being tightly engaged with the gripping edge portion 115. Therefore, it is not necessary for the operator to press the grip side end portion 121a and the portion in the vicinity thereof against the blanket body body 110 side. Therefore, when the metal back blanket 120 is attached to the blanket body 110, the number of workers can be reduced.

(3) The blanket body 110 is rotated in the forward rotation direction α, and the metal back blanket 120 is wound around the outer peripheral surface of the blanket body 110. At this time, the gripping side end portion 121a of the metal back blanket 120 is tightly engaged with the gripping edge portion 115 by the first and second extraction preventing means, and is fixedly supported and does not shift. The back blanket 120 can be wound around the outer peripheral surface of the blanket body 110 in a state of being evenly stretched. It is also possible to insert the body (turn on the body) before rotating in the forward rotation direction α, and further bring the metal back blanket 120 into close contact with the blanket body 110. In that case, a printing plate (not shown) may be attached to the plate cylinder 13 to further adhere the printing plate (not shown).

(4) After the gripping end side end 121b of the metal back blanket 120 comes to a position where it can be inserted into the blanket mounting groove 111, the rotation of the blanket body 110 is stopped. When the rotation of the blanket body body 110 is stopped in this way, the insertion fixing member 150 is removed from the blanket body body 110. Then, when the torso is inserted (the torso is turned on), the routine is ended by removing the torso (turning the torso off). The timing of removing the body may be either before or after removing the insertion fixing member 150.

(5) As shown in FIG. 3, the gripping tail side end portion 121b is inserted into the blanket mounting groove 111 and inserted into the slit groove 114 of the winding shaft 113a. With the grip end side end 121b inserted into the slit groove 114, the winding shaft 113a of the blanket mounting device 113 is rotated, and the grip end side end 121b is pulled and tightened. As a result, the metal back blanket 120 can be mounted on the outer peripheral surface of the blanket body 110 in a state of being evenly tense.

In this way, when the metal back blanket 120 is attached to the outer peripheral surface of the blanket body 110,
(A) The grip side end portion 121a is engaged with the grip edge portion 115 and is fixedly supported by being engaged by the first extraction preventing means (engagement hole 130 and engagement pin 140). Therefore, there is no deviation,
(B) The gripping butt side end portion 121b is towed and tightened by the blanket mounting device 113.
Therefore, during printing, the deviation of the metal back blanket 120 with respect to the blanket body 110 is suppressed. As a result, the occurrence of printing misalignment (misregistration) and the like is suppressed, and good printing can be performed.

As described above, the blanket body 100 according to the present embodiment has a blanket body body 110 in which a blanket mounting groove 111 extending along the axial direction is formed, and a buttock formed at an end edge portion on one end side in the longitudinal direction. The grip-side end 121a and the grip-side end 121b formed on the other end in the longitudinal direction are mounted on the outer peripheral surface of the blanket body 110 in a state of being inserted into the blanket mounting groove 111. The metal back blanket 120 and the pull-out preventing means 130, 140, 150 for preventing the gripping side end portion 121a inserted into the blanket mounting groove 111 from coming out of the blanket mounting groove 111 are provided. ..

Due to such a configuration, the metal back blanket 120 is placed on the blanket body body in a state where the gripping side end portions 121a are prevented from coming out of the blanket mounting groove 111 by the extraction preventing means 130, 140, 150. It can be attached to 110 well. Therefore, it is possible to prevent the metal back blanket 120 from being displaced from the blanket body 110. As a result, the number of workers required when mounting the metal back blanket 120 on the blanket body 110 can be reduced, and good print quality can be ensured.

[Modification example, etc.]
Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above-described embodiments. Various changes or improvements can be made to each of the above embodiments.

[Modification 1]
In the above-described embodiment, the insertion fixing member 150 is used as the second extraction prevention means, but the wedge member 160 as shown in FIG. 9 can also be adopted as the second extraction prevention means. The wedge member 160 can be formed of, for example, elastic nitrile rubber or the like.

The wedge member 160 can be used in place of the insertion fixing member 150. That is, in order to fix the grip side end portion 121a of the metal back blanket 120 to the grip edge portion 115, first, the grip side end portion 121a of the metal back blanket 120 is inserted into the blanket mounting groove 111. And engages with the gripping edge portion 115. Next, the pin tips of the engaging pins 140 are inserted into and engaged with the three engaging holes 130. After that, the elastic wedge member 160 is inserted into the blanket mounting groove 111. In this way, due to the elasticity of the wedge member 160, the gripping side end portion 121a of the metal back blanket 120 is firmly sandwiched between the wedge member 160 and the gripping edge portion 115 (holding side wall surface 111a). It is tightly engaged and fixed to the grip edge portion 115. Then, the body insertion and the body removal are as described above.

[Modification 2]
In the above-described embodiment, both the first extraction prevention means and the second extraction prevention means are provided, but the present invention is not limited to this, and the first extraction prevention means and the second extraction prevention means are provided. A configuration may be configured in which only one of the output prevention means is provided. Further, the extraction prevention means is not limited to the first extraction prevention means and the second extraction prevention means described above, and prevents the gripping side end portion 121a inserted in the blanket mounting groove 111 from coming out. As long as it is possible, various configurations can be adopted. The thickness of the various extraction preventing means is preferably thinner than that of the metal back blanket 120 from the viewpoint that pressure is not easily applied to the member when the body is inserted, but the thickness is not limited to this and is more than that of the metal back blanket 120. A thick one may be used.

[Modification 3]
Modification 3 will be described with reference to FIGS. 10 and 11.
FIG. 10 shows a state in which the metal back blanket 120 is attached to the blanket body 110 while rotating the blanket body 110 in the forward rotation direction α. In the embodiment described with reference to FIGS. 1 to 9, the metal back blanket 120 is attached to the blanket body 110 in the state shown in FIG.
FIG. 11 shows the method of modification 4, in which the metal back blanket 120 is attached to the blanket body 110 while rotating the blanket body 110 in the reverse rotation direction β, which is the direction opposite to the rotation direction at the time of printing. It shows the state of going.

The left and right positions of the paired blanket body 110 shown in FIG. 10 are interchanged, which corresponds to the left and right paired blanket body 110 shown in FIG. In each of the blanket body bodies 110 shown in FIGS. 10 and 11, the blanket mounting groove 111, the accommodating space 112, the blanket mounting device 113, the grip edge portion 115, and the first one are similar to those shown in FIG. It has extraction preventing means (engagement hole 130 and engagement pin 140), second extraction prevention means (insertion fixing member 150 or wedge member 160), and the like. In addition, in FIGS. 10 and 11, 13 indicates a plate cylinder.

As shown in FIG. 10, when the metal back blanket 120 is attached to the blanket body 110 while rotating the blanket body 110 in the forward rotation direction α, the operator cannot see his / her hand and works. There is a problem that it is difficult. On the other hand, as shown in FIG. 11, when the metal back blanket 120 is attached to the blanket body 110 while rotating the blanket body 110 in the reverse rotation direction β, the operator can easily see his / her hand. It has the advantage of being easy to remove. Moreover, since the metal back blanket 120 can be attached to the blanket body 110 while pulling the grip side, the grip side end of the metal back blanket 120 fits the grip edge of the blanket body. Can be engaged well. Further, when the metal back blanket 120 is attached to the blanket body 110, the gravity acting on the metal back blanket 120 acts toward the blanket body 110 side, so that the metal back blanket 120 and the blanket body 110 Adhesion is also improved.

[Modification example 4]
In the above-described embodiment, as the first extraction preventing means, an engaging hole 130 formed in the grip side end portion 121a and a pin tip (projection) of the engaging pin 140 embedded in the blanket body body 110 are adopted. However, instead of the engaging pin 140, a protrusion may be formed on the holding side wall surface 111a. The protrusion formed on the gripping side wall surface 111a can be integrated with the blanket body body 110.

It is clear from the description of the claims that the above-mentioned modifications are included in the scope of the present invention.

1 Printing unit 1a to 1d Printing unit 11 Ink supply device 12 Damping water supply device 13 Plate body 100 Blanket body 110 Blanket body body 111 Blanket mounting groove 111a Holding side wall surface 112 Storage space 113 Blanket mounting device 113a Winding shaft 114 Slit groove 115 Grip edge 120 Metal back blanket 121 Base metal 121a Grip side end 121b Grip side end 122 Blanket layer 130 Engagement hole 140 Engagement pin 150 Insertion fixing member 150a Fixation 150b Insertion 160 wedge Member α Forward rotation direction β Reverse rotation direction

Claims (5)

A blanket body with a blanket mounting groove extending along the axial direction,
A state in which the gripping side end formed on the one end side in the longitudinal direction and the gripping tail side end formed on the other end side in the longitudinal direction are inserted into the blanket mounting groove. Then, the metal back blanket attached to the outer peripheral surface of the blanket body and
A blanket body characterized by having a pull-out preventing means for preventing the gripping side end portion inserted into the blanket mounting groove from slipping out of the blanket mounting groove. The extraction prevention means is
With the engagement hole formed at the grip side end of the metal back blanket,
The blanket body according to claim 1, further comprising a protrusion provided inside the blanket mounting groove and engaging with the engaging hole. The extraction prevention means is
Claim 1 is an insertion member capable of sandwiching the grip side end portion with the grip side wall surface forming the blanket mounting groove by being inserted into the blanket mounting groove. Blanket body described in. The blanket body according to any one of claims 1 to 3 and the blanket body.
A plate cylinder with a printing plate and
An ink supply device that supplies ink to the blanket cylinder via the plate cylinder, and
A printing unit including a dampening water supply device for supplying dampening water to the plate cylinder. The printing unit according to claim 4 and
A paper feed unit that mounts a roll of continuous paper and a paper feed unit
An offset rotary printing press including a folding portion that cuts and folds the continuous paper printed by the printing unit to form a signature.

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