JPS6026711B2 - belt type printing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for supporting an endless printing belt.

In the production of books by a belt-type printing press, such as that invented by Stroud et al. and disclosed in U.S. Pat. , tension any one of the various belts, varying in length from, for example, about 1.5 skins (5 feet) to about 25 skins (75 feet), so that the length corresponds to the number of pages of the book to be printed. This means that it can be maintained in the same condition.

The above patent discloses a support structure that defines a generally egg-shaped belt circuit, which has served the purpose of commercial implementation of single-belt machines successfully. However, the machine represented by this patent should be adapted for applications such as multicolor printing, where a single printable web must be engaged by two or more printing belts. In order to apply the belt support mechanism of the above patent to a multi-belt machine, it would be necessary to have multiple belt support systems, each perhaps about 10 feet long (307 feet), which could be stacked horizontally or vertically. Therefore, it occupies a large amount of factory floor space and space, and probably requires a special building structure. In addition, it is necessary for operators to properly arrange the machines and service the equipment to be adjacent to the plate rolls and impression rolls of each belt installed in the ink train or other equipment. There is a problem of providing space.
Also, due to machine design requirements, printing sites in the machine are probably approximately 2 skins (6 feet) apart from each other along the web path.
It is desirable that they be lined up in the direction of travel with precise and consistent proximity without being separated.

The minimum distance between each print site is desired to avoid distortions in the length of the web that affect the accuracy of color registration. Another important consideration in the storage of rapidly moving belts during printing operations is the possibility of lateral vibration or whiplash, especially when the main portion of the belt must be oriented vertically.

FIG. 1 shows a prior art belt-type printing press in which a printing belt 5 is connected to a driven flat roll 6 and an idler roller.
It progresses around rolls 7, 8 and 9. Printing on the web (printing material) 10 is performed at the pressure bonding portion between the flat roll 6 and the printing roll 11. Rolls 12 constitute an ink train, two of which are in rolling contact with flat roll 6. The circuit of the belt 5 can be lengthened and shortened by the operation of a screw device 14, which connects the bearing blocks of rolls 9 and 8 to adjust the length of the belt circuit of the machine suitable for belts of different lengths. It can be operated from above. The arrangement represented in FIG. 1 is generally the current state of the art and is disclosed in detail in U.S. Pat. No. 3,518,940 to Stroud et al. According to the invention, there is provided a device for supporting an endless printing belt having printed and non-printed surfaces, some of which are separated by non-printed zones that are continuous in the longitudinal direction of the belt. The device is further divided into a plurality of distinct impression areas, and the device further includes a flat roll (plate roll or plate sill), between which the belt passes, and a printing roll (impression roll or impression cylinder); a belt guiding assembly including rotatable cylindrical means with parallel and staggered axes, the cylindrical means defining a tortuous path of successive inversions and turns, the path of which extends over at least one of the belt circuits; It forms part of the This cylindrical means is also divided into two groups, one group engaging the non-printing side of the belt and the other group engaging the printing side of the belt, and each member of the latter being engaged with the non-printing side of the belt, and each member of the latter being engaged with the non-printing side of the belt. The belt includes a cylindrical disc which is spaced apart in the direction of the ball and is positioned to engage with the upper part of the belt in use. According to one particular embodiment of the invention, a belt printing press comprises a device for supporting an inorganic printing belt in a tortuous path tightly packed in a box-shaped area adjacent to the path of the web to be printed. It is merging.

The rotatable cylindrical means are arranged with parallel and staggered axes to form a tortuous path. The belt has a non-printing side and an opposing printed side divided into a plurality of laterally spaced rows of impression areas (image areas) and separated by a longitudinally continuous non-printing band. As such, at least the rotatable cylindrical means in contact with the printing surface has a cylindrical disk member in engagement that tracks the non-printing band. A hitherto entirely unexpected consequence of this tortuous arrangement is that the ease with which the belt tracks each cylindrical device is improved. In a preferred embodiment of the invention, some of the cylindrical means defining the belt circuit, with respect to said box-shaped area, have a peninsular shape terminating in a flat cylinder adjoining the web path and adjoining said box-shaped area. It has been rearranged to form an area of

This arrangement of the cylindrical means covers the main part of the circumference of the flat cylinder,
For example, 18 pins or more can be engaged with the belt, thereby bringing the area of the belt into rotational contact with an inking device, a printing roll, or a portion of the belt supported on a flat cylinder. Provides valuable additional space for other equipment needed. The invention will be better understood by the following exemplary description of an embodiment with reference to the drawings, in which: FIG.

Figures 2 to 5 illustrate an example of the present invention, which achieves better utilization of space, especially as required for more complex installations, such as multi-color printing presses, and which also achieves better utilization of space, as required by the 3518-0, which also utilizes the simpler mechanical operating principles. For example, in FIG. 2, the web 20 (printing material) fed out from the supply V supply roll 21 is connected to printing rolls (impression rolls) 11a and 11b, and flat rolls (
A mechanism is disclosed for passing through two printing sites determined by the contact with each belt 5a and 5b supported against the transport roll by a plate roll) 6a and 6b. Figure 2 shows two belt track units 2.
4 and 25, which include, in addition to each flat roll 6a and 6b, various cylindrical means or non-driven idler rolls 26-34. As is obvious from the drawings, among these rolls 6a, 28, 30, 32,
33 and 34 engage the non-printed or inner surface of belt 5a.

The situation is similar regarding belt 5b. The printing surface of belt 5a or 5b is printed on rolls 26, 27, 29 and 31.
and grandson. The printed surface of the belt, which is clearly depicted in FIG. printing area 36 (image area) covered by the printing plate of
are arranged in vertical columns. The bands and print areas constitute the print surface 38 of the belt. Also shown in FIG. 5 is the normally smooth backside non-printing surface 39 of the belt. It should be noted that roll 29, one representative type of roll that contacts the printing side of the belt, includes contact means 41 and a plurality of cylindrical discs 42. The discs are spaced apart in the longitudinal direction of the contact means so as to come into rotational abutment along the longitudinal non-printing band 37 of the belt. The inside of the disc 42 is narrower than the inside of the band;
It is designed not to interfere with the sealing medium on the belt. Since the belt 5b is usually constructed of an unstretched but flexible synthetic polymeric material, such as polyester known under the trademark "Mylar", the outer circumferential surface of the disc 42 is also made of a similar plastic. or any material that is stiff enough to reliably support the belt, but flexible enough to minimize wear on the belt.

Roll 28 is shown having a continuous cylindrical surface for engaging the non-printing side of the belt. flat roll 6
a and 6b must in any case have an uninterrupted cylindrical profile. This is to provide firm support to the belt during printing as it passes through contact with flat rolls 6a, 6b and printing rolls 11a, 11b. However, experience has shown that other than the flat rolls 6a and 6b, it is possible to employ other rolls that come into contact with the non-printing surface 39 and rolls having the same structure as the multi-disc roll 29. As described herein and also in U.S. Pat.
In operating a printing press such as that disclosed in No. 518,940, for example,
It is important that the belt track guide system be able to accommodate belts that vary widely in length (such as 75 feet).
The dotted line in FIG. 3 and the belt in FIG. 4 are shown engaging the bypass aid roll 30'. When the track system assembly is on the order of about 2 inches (6 feet) in length, adding such a bypass means would likely make the system about 3 skins (10 feet or 12 feet) shorter in length. It has the effect of adapting to the belt. However, this system
Adjustment capability must also be provided for smaller increments than the large increments caused by bypassing by rolls. In FIG. 3, the roll 28, which is placed in the inverted fold, is shown to be connected with a screw device 46, so that the roll can be moved horizontally in the inverted fold. The belts can be adjusted in the direction of the loops 27, 29 and vice versa, allowing considerable incremental adjustment due to the different belt lengths, lengthening or shortening the circuit.
The roll 34 is also shown connected to a screw device 47, and it can be seen that by moving it vertically, slight up and down adjustments of the belt are possible. Since the belt track system requires tension, a device of one of the idler rolls is pushed against the web 5a as shown in FIG. It may also be supported elastically. One of the most frequent chores in operating and maintaining a printing press is servicing the ink train 51 or 52.

The configuration of the printing press shown in FIG. 2 is extremely convenient for printing two or more tones on the web. Although the machine of FIG. 2 has the capability of two-tone printing, additional track units similar to track units 24 and 25 can easily be added to print more than four colors. Roll 27~
It should be noted that 33 forms the tortuous path portion of the entire circuit of belt 5a or 5b within an approximately box-shaped area.

Rolls 33, 34, 6a or 6b, 26 and 27 form the other part of the belt circuit, which part is peninsular with respect to the box-shaped area just mentioned. Orbit system 24
and 25 are formed in the same relationship as the box-shaped area for each peninsular area. Two sided regions 55 and 56, namely formed as extensions of the same corresponding sides of the box-shaped regions, are formed on the underside of each box-shaped region as shown on the outside of the belt circuit; Ink trains 51 and 52 are positioned with sufficient space for personnel to service them and the idler rolls in the system. The belt track system is constructed such that the maximum height is within approximately 2 (7 feet) and all parts can be placed within easy reach of the operator or maintenance personnel. The configuration of the belt track described here has other advantageous results in that in the peninsular arrangement of the parts of the belt circuit extending around the flat rolls 6a, 6b, the belt can, depending on the position of the rolls 34, Contact is made over 180 degrees.

This feature of the track system provides for a relatively large area of the belt to be in contact with the track rolls, which are in contact with other rolls, such as the printing roll 11a and the inking rolls 58, 59 of the ink train 51 or 52.
, can be engaged with. In designing the ink train, it is desirable to arrange as many ink-carrying rolls as practical to contact the portion of the belt supported on the flat rolls. In most cases, at most 4.
However, two inking rolls are preferred, and in some cases more are provided. As shown in FIG. 2, a common system is used to drive the web advancement roll 61 and the belt advancement system of both track units 24, 25, as well as to drive the printing rolls 11a, 11b for precise synchronization of belt and web. A drive means 62 is used.

Printing rolls 11a, 11 as schematically shown in FIG.
b to the adjacent flat roll 6a and belt 5a
As shown in FIG.
, 1 1b. These rolls 6a, 11
a Shaft 63 suitably supported on frame member 65
, 64 and the gears 66, 67 mounted on the shafts 63, 64, respectively, are connected to the rolls 6a, 11a.
It has a pitch circle diameter corresponding to the diameter of , and exhibits the same circumferential speed. The idler rolls of each belt track system are supported on high-grade anti-friction bearings so that the belt is
It is designed to be driven only by the sprocket gear 68 that is meshed with the gear. This sprocket gear 6
8 is rotatable relative to the flat roll via a clutch 71 as disclosed in US Pat. No. 3,518,94. Similar sprocket and clutch mechanisms are provided at the other ends of the rolls 6a, 6b. In the development of the above-identified U.S. patent machine, the relative motion allowed under the friction limits of the two clutches maintains the belt in proper misregistration with the sprocket even at high printing speeds. Therefore, it was discovered that a sprocket drive mechanism for the belt and a portion between the sprocket drive mechanisms for the rolls were required. The invention specifically disclosed and illustrated herein provides an improved apparatus for storing a movable printing belt in a belt-type printing press having multiple printing stations processing a single web. Machines that reduce lateral vibrations of belts moving at high printing speeds and provide belt support structures for improved belt track capacity; Provide adequate space for personnel performing maintenance functions around the printing area. providing an apparatus capable of handling a large range of printing belt lengths; and further enabling the belt passing around it to encircle a large portion of the circumference of each flat roll. It will turn out that.

[Brief explanation of the drawing]

1 is a line drawing illustration of a part of a belt-type printing press according to the prior art, FIG. 2 is a line drawing side view of the main parts of a two-belt printing press according to the invention, and FIG. 3 is a short length belt Figure 4 is a line drawing side view of a single printed belt unit showing the bias portion of the belt support structure in practice in a belting system; FIG. 5 is a partial side view of the elements of FIG. FIG. 2 is a partially cutaway partial side view showing the driving relationship between the web and the printed web. 5, 5a, 5b...Printing belt; 6, 6a, 6
b... Flat roll: 7, 8, 9, 26-34... Idler roll; 10, 20... Web; 11, 11a, 1
1b...Printing roll; 12...Ink train:
14, 46, 47... Screw device; 21... Supply roll; 24, 25... Track unit: 36.
...Print area: 37...Non-print zone; 38.
...Printed side: 39...Non-printed side: 41...
... Touching means; 42 ... Disc; 48 ... Spring: 51, 52 ... Ink train, 55, 5
6... Dual area: 58, 59... Inking roll: 62... Common drive system: 63, 64.
・・・．・Shaft; 65...Frame member;
66, 67. ．．・...Gear: 68...Sprocket gear: 69...Small hole: 71...Clutch. rJG. Z r'G. 2 r'C. 6 FIG. 3 r'G. 4 rIG. 5

Claims (1)

[Claims] 1. The belt has a printing surface and a non-printing surface on the back side, and the printing surface is divided into a plurality of printing areas 36, which are further divided into non-printing zones 37 extending continuously in the longitudinal direction of the belt. In a belt-type printing machine comprising endless printing belts 5a, 5b separated by the
a belt guiding assembly including rotatable cylindrical means 28-32 whose axes are parallel to each other but staggered, the cylindrical means defining a tortuous path of successive reversals and turns;
The path forms at least part of a belt circuit and the cylindrical means includes a first group 28, 30, 32 which engages the non-printed side of the belt and a second group which engages the printed side of the belt. It is divided into groups 29, 31, each cylindrical means in the latter group being used in the non-printing zone 37 of the belts 5a, 5b.
A belt-type printing machine with an endless printing belt support device, characterized in that it includes a cylindrical disk 42 arranged at intervals along the shaft 41 in a position in engagement with the belt. 2. Another group of rotatable cylindrical means 27, 26, 34, the cylindrical means occupying a first generally box-shaped area and supported on a plurality of axes of the device and defining other parts of the belt path.
2. The apparatus according to claim 1, wherein the other portion surrounds a peninsula-shaped area projecting from the box-shaped area and defines the end of the passage around the flat roll 11. . 3. The apparatus further includes an inking device 51 having at least one roll in counter-rolling relationship with the circumferential portion of the flat roll 11, the rotatable cylindrical means having a peninsula-shaped area in a box-shaped area. forming an in-line type extension on one side;
2. The inking device is arranged to define an area external to the circuit and substantially below a box-shaped area in which the inking device is received. equipment. 4. At least one of the rotatable cylindrical means
an idler roll 28, one in a group of Claims 1 and 2 are characterized by being supported so as to be movable.
or the device described in Section 3. 5. Apparatus as claimed in claim 4, characterized in that the idler roll is located in one of the inverted folds of the passageway. 6. Claims 1 and 2, characterized in that the idler roll 32 is elastically mounted, so that it is elastically pressed against the belt 5.
, 3, 4 or 5. 7 has a printing surface and a non-printing surface on the back side, and the printing surface is divided into a plurality of printing areas 36, which are further separated by a non-printing zone 37 extending continuously in the longitudinal direction of the belt. In a belt-type printing machine including endless printing belts 5a, 5b, flat rolls 6a, 6b provided so that the belt runs between them, and printing rolls 11a, 11b,
a belt guiding assembly including rotatable cylindrical means 28-32 whose axes are parallel to each other but staggered, the cylindrical means defining a tortuous path of successive reversals and turns;
The path forms at least part of a belt circuit and the cylindrical means includes a first group 28, 30, 32 which engages the non-printed side of the belt and a second group which engages the printed side of the belt. It is divided into groups 29, 31, each cylindrical means in the latter group being used in the non-printing zone 37 of the belts 5a, 5b.
a cylindrical disc 42 spaced along the shaft 41 in engagement with the web, further advancing the web and bringing the flat rolls 6a, 6b into synchronous surface engagement. A belt with an endless printing belt support device, characterized in that it comprises means 62 for driving at a combined speed, said flat roll also comprising associated belt drive means 68 for advancing each belt engaged therewith. pattern printing machine. 8. Said another group of rotatable cylindrical means 26, 27, 34
8. Device according to claim 7, characterized in that the idler roll (34) comprises an idler roll (34) which is adjustable for the tensioning of the belt (5). 9 each of said belts having an extra end with longitudinally spaced perforations, said flat rolls 6 each having a sprocket-like shape in meshing relationship with each belt in coaxial driving relationship therewith; 8. The device according to claim 7, characterized in that it has a toothed member.