JPS6085954A - Cover for damping roll of offset printer - Google Patents

Abstract

PURPOSE:To obtain a fabric cover completely free from irregularity caused by shrink dapple thus accelerating the printing speed of a printer, by preventing continuation in the axial direction of a portion of a high water-contractive yarn running over a stitched loop of yarn and a portion running under a stitched loop of yarn. CONSTITUTION:A cloth cover 80 is a napped fabric woven into a cylindrical form with a stitched loop of yarn 2 with a high water-contractive yarn 1 inserted straight in a circumferential direction running between stitched loops of yarn at an interval of a single loop or a plural number of loops. A doubling yarn 1 does not continue at a spot 6 jumping over a stitched loop of yarn and at a spot 5 diving under the loop either in an axial direction W or in a circumferential direction C. Besides, a fine dappled pattern is uniformly distributed in a ground texture. Consequently, it is possible to obtain a fabric cover having a uniform surface completely free from an irregularity caused by a shrink dapple in the circumferential direction and the axial direction of a roll. A damping roll equipped with a fabric cover does not cause a wetting dapple even at high rotary speed, thus enabling printing at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides water to the plate cylinder of a printing press 2)
The present invention relates to a cloth cover that is attached to the outer peripheral surface of a humidifying roll.

More specifically, the present invention relates to a cloth cover for a humidifying 11-rule of a rare printing machine using hydrophilic yarns as pile yarns and ground yarns and water-shrinkable elastic yarns as plating yarns. It is.

In an offset printing machine, water must be supplied to the cylinder of the press to make it float, and this humidification is an important factor in determining the quality of the finished product.

However, conventional cloth covers tend to loosen or wrinkle during use. Therefore, it often happens that printing has to be stopped midway and the cover replaced with a new one, and as a result of this replacement, printing defects inevitably occur when the same printing is done. decreases,
1 This replacement work was troublesome and required 7 pH bonds, and the processing fee was also expensive.

To overcome these disadvantages, a water-shrinkable fabric cover was developed and published in US Pat. No. 3,926,701. Cloth cover 71 made by this American patent method
Attach it to the Qt+-le, then soak it in water to shrink it.
Although it tightly adheres to the roll's outer circumferential surface, it also shrinks not only in the circumferential direction of the roll but also in the axial direction of the roll, so before immersing it in water, attach both ends to the roll shaft 7.
2 had to be bound with a string or wire 73, and was unsuitable for a humidifying roll in which the side collar shafts 72 at both ends of the 11-luer 4 did not protrude. Further, even if both ends are tied together, shrinkage spots occur in the axial direction of the roll, and the circumferential surface of the roll cannot be accurately smoothed, resulting in the inconvenience that moisture spots occur due to the spots. In other words, as shown in FIG. The end portion with the ridge 75 is different from the center portion without the ridge, and as a result, the amount of water supplied to the cylinder is also different; In the area of medium heat, there was a problem of printing defects caused by uneven printing.The problem of sagging occurs more frequently as the printing press rotates at higher speeds.
Traditional cloth covers hinder the speed of printing presses.

In this regard, this invention was invented and patented in the patent application filed in 1983.
The cloth cover according to No. 31051 uses yarn with high water shrinkage when knitting into a tubular shape with a circular knitting machine by using a yarn that does not have a large water +1Y shrinkage as the ground yarn and using a hydrophilic yarn as a pile yarn. It is made by inserting the yarn in a straight line in the course direction of the knit fabric without creating a Kawaguchi loop.It contracts greatly in the circumferential direction, but not as much in the axial direction, so it is difficult to trigger. Problems such as bundling and shrinkage spots in the axial direction of the rolls can be improved. However, in the cloth cover according to Japanese Patent Application No. 57-131051, there are two locations where the highly water-shrinkable plating thread goes over the ground stitch loops and where it goes under the ground stitch loops, respectively. When this was attached to the roll 78, streaks (stripe) continued in the axial direction as shown schematically in Fig. 2.
77 appears! J1 Naka I! jp, caused spots.

Therefore, it is an object of the present invention to provide a novel and improved cloth cover.

That is, the first object and effect of the present invention is that when attached to a humidifying roll and immersed in water, the roll thickens (shrinks) in the circumferential direction of the roll, but hardly shrinks in the axial direction of the roll; To provide a cloth cover that is free from even the slightest unevenness due to shrinkage spots.

A second object and effect of the present invention is to provide a cloth cover that does not cause uneven shrinkage in the circumferential direction of the roll even when it contracts in the circumferential direction of the roll.

This object of the invention is achieved by knitting a cylindrical fabric with a surface pile while knitting other threads and plating threads using a circular vA machine such as a Lipny Soter.

That is, the cloth cover according to the present invention is composed of a pile yarn, and ground yarn and plating yarn that form a ground weave structure for planting the pile. 6. To achieve the object of the present invention in Section 2, the plating thread is placed between each of the ground thread stitch loops that the ground yarn makes in the direction of each knitting course without making any stitch loops. -1- A thread that is knitted so as to extend linearly in the thread direction and has higher water shrinkage than the hydrophilic thread used as the ground thread is used as the plating thread.

That is, the cloth cover according to the present invention is a covered fabric knitted into a cylindrical shape by the eyelet loops of the base yarn 2, and every one or every few cross-grain loops of the base yarn go over and under the other yarn stitch loops. It is constructed by knitting water high shrinkage yarn 1 so that it stretches linearly in the course direction through between the ground yarn stitch loops by repeating diving, without creating a q-th loop, It is characterized in that the portion of the yarn that goes over the ground yarn stitch loop or the portion that goes under the ground yarn stitch loop is not continuous in the wale direction. In other words, the ground knitting structure is composed of ground stitch loops that are chained in each wale direction and course direction of the ground yarn 2, and the pile yarn 3 is entangled with this ground stitch loop. It is knitted in a gripped manner to form a pile 4, and on the other hand, the plating yarn does not form stitch loops in each course, so that there is no chain between each course.
Therefore, plating is not used in plating (where the pile is implanted in other tissues).

In this way, the plating is carried out in each course by the river "1 Rui 1
It extends continuously in a straight line in the 1-st direction while penetrating the space up and down, and therefore passes over a certain ground yarn Kawaguchi loop, passes under the next adjacent other yarn stitch loop, and continues again. The ground yarn is knitted into the ground texture by repeating over the neighboring ground yarn stitch loop, but at the same time, according to the second feature of the present invention, this repetition is performed so that it does not continue in the wale direction. . In other words, in the wale direction, when going over the ground stitch loop of a certain course, it goes under the ground stitch loop of the adjacent course, and then crosses over the ground stitch loop of the subsequent adjacent course. In addition, in any wale direction, the plating yarn is knitted so that it does not continuously go over or under the base yarn stitch loop of each adjacent course.

In the present invention, the fabric cover is knitted into a cylindrical bag shape using a circular knitting machine, and is attached to the roll by inserting a roll into the cylinder, and the course direction of the fabric cover is in the circumferential direction of the roll. The wale direction of the fabric cover coincides with the axial direction of the roll. Therefore, in this application, the terms "course direction" and "circumferential direction" and "wale direction" and "axial direction" are interpreted and used as interonyms. It will be done.

For the pile yarn and other yarns, ordinary hydrophilic yarns such as rayon, cupro, acetate, cotton, etc. are used.

On the other hand, for the plating thread, a highly water-shrinkable thread having a water shrinkage rate of 20% or more, such as non-acetalized rayon, is used.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 3 and 4.

FIG. 4 schematically shows a very small part of the fabric cover according to the present invention, in which 1 has a water-high shrinkable thread, 2
is ground yarn, and 3 is pile yarn.

The ground yarn 2 has other yarn stitch loops 11, 12, 13, 14, 15..., 21, 22 in each wale WL W2, W3, W4, W5... of each course C1, C2, Ca...・
23, 24, 25..., 31, 32, 33, 34, 3
5... are made continuously, and each wale W1, W
2, W3, W4, W5... It's your turn (l!
! Yarn stitch loops 11, 21, 31..., 12, 22,
32..., I3.23.33...14.24.34
... are linked together to form a ground line organization.

The pile yarn 3 is intertwined with other yarn stitch loops and knitted to form a pile 4. Incidentally, the bail 4 shown in FIG. 4 is a loop bail, but the tip is cut open by jarring to finish it as a 7-top pile.

The plating yarn 1 goes under the base thread stitch loop 11 in each course C1, C2, Ca, . Go over the top, pass between the ground thread stitch loop I2 and the ground thread stitch loop 13, go under the ground thread loop 13, pass between the other thread stitch loop] 3 and the other thread stitch loop 14, and pass the "ζ ground thread" By repeating passing over the 1- of the thread stitch loops 14, passing again between the ground thread stitch loops I4 and 15, and diving under the ground thread width "1 loop 15, each of the coasts C1, C2, Ca
The stitch loops 11, 12, 13, 14 of ground yarn 2 are continuous in a straight line without creating stitch loops in the ... direction.
・15..., 21, 22, 23, 24, 25...,
It is woven into a ground line structure of 31, 32, 33, 34, 35... Then, F of the ground thread eyelet loop of plating thread 1
In the wale W1 direction, the point where the thread goes under the ground thread loop 11 of the course CI, the part where it goes over the ground thread loop 21 of the next course C2, and the point where it goes over the ground thread loop 21 of the next course C2. Alternately for each adjacent course, such as crossing the tenth of the ground stitch loop 31 of course C3 again, the place where the plating yarn crosses the second of the ground stitch loop or the place where the ground stitch loop falls into the king. Continuous in the wale direction.

do not have. In addition, the plating yarn 1 does not form a stitch loop and does not play the role of locking the bail 4 to the ground wire structure as described above.
The cloth cover 80 according to the present invention is a cloth that is knitted into a cylindrical shape by stitch loops of the ground yarn, and the ground yarn width is set so that every loop or every few loops go over and under the other yarn stitch loops. By repeatedly diving into the loop, the high water shrinkage yarn is inserted linearly without creating stitches in the ゛ζ′:lI-ska direction between other yarn stitch loops, and the ground yarn of the high water shrinkage yarn is The plating thread is similar to the fabric cover 76 of Japanese Patent Application No. 131051/1983, which is characterized in that the part 6 that goes over the stitch loop or the part 5 that goes under the ground stitch loop is not continuous in the wale direction. When the ground yarn continuously goes over or under the loop in a certain wale direction, streaks (stripes) 77 are formed in the wale direction as shown in Fig. 2.
In the present invention, the part where the plating thread 1 exceeds the "2" of the base thread stitch loop [j and the part 5 where it goes under] is not continuous in the wale direction W or the course direction C, but is evenly distributed in the other weave. 11
1. As shown schematically in Fig. 3, the point 6 that goes over ``2'' and the point 5 that goes under ``2'' of the ground thread loop form a round pique pattern, that is, a circle like a deer's mottled pattern. They are evenly distributed both in the circumferential direction and in the axial direction, and therefore, the streaks due to the difference in shrinkage that occur between the part of the plating yarn that goes under the ground yarn stitch loop and the part that emerges from the top of the plating yarn are in the wale direction, that is, in the circle of the roll. A humidifying roll that has a uniform surface with no unevenness due to shrinkage spots in the circumferential direction and the axial direction of the roll, and that has a uniform surface with a cloth cover attached. .

In this way, the humidifying roll equipped with the fabric cover of the present invention does not cause humidification even when rotated at high speed, making it possible to speed up printing.

Therefore, as is clear, the contribution of the present invention to the development of the printing industry is extremely significant.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a humidifying roll equipped with a conventional cloth cover, Fig. 2 is a perspective view schematically showing the surface of a conventional humidifying iJ-roll, and Fig. 3 is a humidifying roll according to the present invention. FIG. 4 is a perspective view schematically showing the surface of the roll, and FIG. 4 is a partially enlarged view of the fabric cover material according to the present invention. , is a first view. 1. Core thread 2. Ground thread 3. - Vile thread 4. Pile 3 (0. - Cloth cover patent applicant Insertion - Authorized representative Patent attorney (1118!l) Shigeru Shigeru 1.. 11A ? Procedural amendment November 1980 9 C.D. Commissioner of the Patent Office■, Indication of the case 1982 Patent Application No. 136200 2, Title of invention Offsey I/Cover for Humidifying Rail of Printing Machine 3, Person Making Amendment Case Relationship with Applicant address: 952 Nango, Koryo-cho, Kitakatsuragi-gun, Nara Prefecture Name: Insertion-4, Agent address: 3-21-6, Suehiro-cho, Kita-ku, Osaka City, Subject of amendment (1) Name of the invention in the description Opening (21 Specification IIY'1 of the claims of Tsuru. Contents of the amendment +11 Name of the invention in the specification as per the attached sheet of 1 Offset printing machine, ・, t,), 85
954 (5) ■ Corrected 2, Claims It becomes a cloth with a cylindrical shape 1 formed by the stitch loops of the ground yarn, and -(((also 1 or several) By repeatedly going over the top of the stitch loop at every turn, and then diving down to G, the ground yarn moves between the stitch loops jff3° (:1 - water i!% 'I!1! without creating a stitch loop in the direction).
A shrinkable yarn is inserted, and the part of the water-high shrinkable yarn that goes over the ground thread stitch loop and the part that goes under the ground thread stitch loop is not continuous in the wale direction. A cover for the humidifying rail of an offset printing machine.

Claims (1)

[Claims] By repeatedly going over the "-" of the stitch loop and then diving downward, the part that goes under the Asahi-style stitch loop moves in the wale direction without creating a stitch loop in the course direction by passing between the ground stitch loops. A cover for the humidifying roll of an offset printing machine that is not continuous.