JPS6124990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-sided corrugated board manufacturing apparatus, and more particularly, to a core holding system in which a stepped core formed by a first corrugating roll and a second corrugating roll is suction-held around the second corrugating roll. Regarding equipment.

A manufacturing device for single-sided corrugated board generally consists of a pair of first and second corrugating rolls that are engaged with each other, and a corrugated core is passed between these corrugating rolls to form a corrugated shape. A device for gluing the corrugated corrugated peaks formed on the core while it is transported by a press roll, a press roll for pasting the liner onto the glued core on a second roll, In order to prevent the core from tending to separate from the second roll under the action of centrifugal force during conveyance, the core is
It consists of a finger plate held on a corrugated roll. In this configuration, since the core constantly moves in contact with the finger plates, the finger plates often wear out, and it is necessary to adjust the position of the finger plates with respect to the corrugated rolls each time. If this adjustment is incorrect, the adhesive may be applied unevenly or the formed tiers may be crushed or distorted, resulting in poor quality of the corrugated board product. Furthermore, a drawback of this single-sided corrugated board manufacturing equipment is that a large number of finger plates are arranged at narrow intervals, for example, about 100 mm, in the longitudinal direction of the corrugated roll, and it is natural that the part of the corrugated board facing that part is glued. As a result, a large number of desizing lines are formed along the length of the core.

In order to eliminate these drawbacks, a number of so-called non-punger type single-sided corrugated board manufacturing apparatuses that do not use finger plates have been proposed. A typical example is that a large number of annular suction grooves are provided on the outer peripheral surface of the second stage roll at intervals along its length, and negative pressure is applied to these suction grooves to form a corrugated medium. This is a type in which the core is held under suction around the second stage roll. In this case, the most important point that must be practically considered is how to apply negative pressure to the suction groove. Conventionally, a method is well known in which suction nozzles are inserted into annular suction grooves at upper and lower positions on the side of the second stage roll that is not covered by the core. As is well known, corrugated rolls are heated by circulating heated steam through their hollow parts, causing thermal expansion, and
The annular suction groove of about 2.5 mm is getting narrower and narrower, and the suction nozzle inserted here wears out due to friction with the suction groove due to the high-speed rotation of the corrugated rolls, which has the disadvantage of having to be replaced constantly. . A further drawback that is to be avoided is that the opening of the nozzle is very small, so that the suction force must be very high in order to create an effective negative pressure in the annular suction groove. Moreover, in the nozzle system, paper dust from the core produced during suction of the core adheres to the nozzle within a relatively short period of time, clogging it and causing a decrease in negative pressure. To restore effective negative pressure, the nozzle can be removed and cleaned, but this process is time consuming and very troublesome.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a core holding device that is extremely innovative as a non-finger type corrugated board manufacturing machine.

According to the present invention, the above object is to configure one common suction chamber that communicates with a large number of annular suction grooves of the second corrugated roll between the arcuate surface of the main body of the suction device and the circumferential surface of the corrugated roll, Each body communicates with a common duct,
This is achieved by providing suction holes that are each in line with the annular suction groove. The suction chamber has a very small volume, so the exhaust efficiency is very good. Negative pressure is applied almost directly from the suction hole to the annular suction groove, and a relatively small exhaust fan can provide effective suction power. can be caused. During operation, the suction hole acts like a suction nozzle, but since it is formed as a sufficiently large hole relative to the annular suction groove, it will not become clogged with paper powder.

Support blocks are provided at intervals along both sides of the main body to form a guide groove that is in line with the annular suction groove, and within the guide groove, an insert plate having an arcuate surface at the lower end is located at the upper limit position. and a lower limit position, and at the upper limit position, the insert plate is in a position such that its lower end arc surface is somewhat inserted into the annular suction groove, and the core passes around the corrugated roll. The entire circumference of the annular suction groove is communicated with the suction chamber, and atmospheric suction from the side of the corrugated roll is prevented, thereby preventing suction loss. When using a core that is wider than the width of the corrugated roll, the parts not covered by the core, usually several insert plates at both ends, are lowered to the lower limit position to create a gap between the suction chamber and the annular suction groove in that part. Cut off contact to prevent suction loss.

Furthermore, according to the invention, the suction device of the core holding device is heated by circulating heated steam inside it, so that it can be adapted to thermal expansion due to heating of the corrugated rolls, and thus: Disadvantages due to differential thermal expansion between the corrugated rolls and the suction device can be completely avoided.

An embodiment of the present invention will be described in more detail with reference to the drawings.

A single-sided corrugated board manufacturing machine to which the apparatus according to the present invention is applied has a pair of first and second corrugating rolls 1 and 2 that engage with each other, and a press roll 3 that cooperates with the second roll. , the core is passed between first and second corrugating rolls rotating in opposite directions to form a corrugation, and the core with the corrugation formed runs around the second corrugating roll 2; During this time, glue is applied to the tops of the corrugated corrugations by a gluing device, and the liner running around the press roll 3 is combined between the second corrugation roll 2 and the press roll 3 and pasted together. The single-sided corrugated board thus formed is fed to the next process. As is well known, the interior of the first and second stage rolls is heated by introducing steam. Although the single-sided corrugated board manufacturing machine is actually arranged obliquely at a certain angle, it is shown in FIG. 1 in a horizontal arrangement for convenience of explanation.

The core holding device according to the present invention includes a first corrugated roll 1
between the nip of the second corrugating roll 2 and the nip of the second corrugating roll 2 and the press roll 3, on the side opposite to the side through which the core passes (upper side in the figure), and with a suitable support device. suspended. The second stage roll 2 has a large number of annular suction grooves 4 spaced apart in the length direction on its circumferential surface. The suction device of the core holding device has a body 5 which extends over the length of the second corrugated roll and has a substantially rectangular plane, which body has an arcuate surface 7 which together with the surface of the corrugated roll constitutes a suction chamber 6. It is equipped with This arcuate surface 7 is preferably formed to be slightly larger than the outer periphery of the corrugated roll 2 for the purpose described later. The main body 5 has a middle part 8 inside, which hollow part constitutes a steam chamber for heating the suction device of the core holding device. The purpose of heating the suction device with steam is to accommodate the device to the thermal expansion of the corrugated rolls. Adjacent to both side edges of the main body, a large number of suction holes 9 are provided in two rows in line with the annular suction groove 4 of the second stage roll 2 and communicated with the suction chamber 6. A suction duct 10 associated with each row of suction holes 9 is installed on the top surface. The suction duct 10 is connected via a suitable conduit to a suction source, for example an exhaust fan. The main body 5 has a number of supports 11 arranged at narrow intervals on both sides thereof, and the supports 11 include an upper support block 12 fixed to the side of the main body 5 and a screw thread on the side of the main body 5. There are vertically extending guide grooves 14 in line with the annular suction grooves 4 of the corrugated roll 2 between the adjacent upper support blocks 12 and between the adjacent lower support blocks 13, respectively. ,1
5 are respectively configured. The lower support block 13 has a circular arc surface 16 close to the circumferential surface of the second corrugated roll 2 at its lower end.
It is equipped with Elongated and relatively thin insert plates 17, 18 are vertically slidably disposed within the guide grooves 14, 15, each insert plate having a guide pin 19 supported horizontally between adjacent lower support blocks 13. A vertically extending elongated hole 20 is formed to receive the . The insert plates 17 and 18 have arcuate surfaces 21 at their lower ends, with an upper limit position where the arcuate surface 21 is somewhat inserted into the annular suction groove 4 and a lower limit position where the arcuate surface 21 is deeply inserted into the annular suction groove 4. It can be moved vertically between positions. In the upper limit position of the insert plate, the annular suction groove 4 communicates with the suction chamber on its entire circumference while the core is passed around the corrugated roll, and the insert plate is able to absorb atmospheric air from the side of the corrugated roll and thus prevent loss. In order to hold the insert plates at the upper and lower limit positions, the insert plates 17 and 18 have a main body 5.
A pair of upper and lower notches 22 are formed at the side edge of the portion that protrudes further upward. side cover 2
3 and 24 are fixed to the upper and lower support blocks 12 and 13 of the support body 11 by suitable means such as screws, and the side covers 23 and 24 that hold the insert plates 17 and 18 from the sides are each made of a single elongated piece. Although it may be a plate, it is preferably divided into a plurality of sections, for example three sections, as shown. A latch 25 is pivotally attached 26 to the upper edge of the side covers 23, 24 adjacent to each insert plate 17, 18, and the latch 25 is oriented toward the insert plate by a leaf spring 27 whose lower end is fixed to the side surface of the side cover. The insert plate is biased and engaged with one of the notches 22 to hold the insert plate at either the upper limit position or the lower limit position. The side cover 23 on the side adjacent to the first corrugating roll 1, that is, on the sheet feeding side, extends toward the nip between the first corrugating roll 1 and the second corrugating roll 2, and has arcuate surfaces 28, 29 along the circumferential surface of each corrugating roll. It has a wedge-shaped lower end. The arcuate surface 28 serves as a guide for guiding the core into the nip of the corrugating rolls 1 and 2. Cover 2 on the side adjacent to the press roll 3, that is, on the paper discharge side
4 has a flat lower edge and insert plate 18
A protrusion 30 protruding outward at the lower end of the
is adapted to engage the flat lower edge of the side cover 24 when the insert plate 18 is in the upper limit position. Projection 30 of insert plate 18
is a single-sided corrugated board whose side edges are pasted between the second corrugated roll 2 and the press roll 3.
It serves as a guide for separating from the corrugated roll 2. The end plates 31, 31 are fixed to both end surfaces of the main body 5 and engage with the end surfaces of the second corrugated roll 2, thereby sealing the ends of the suction chamber.

During operation of the single-sided corrugated board manufacturing machine, the suction chamber 6 is evacuated by an exhaust fan through the suction duct 10 and the suction hole 9, thereby creating a negative pressure in the annular suction groove 4. The volume of the suction chamber 6 created between the arcuate surface 7 of the main body and the second stage roll 2 is very small;
The air exhaust efficiency is very good, and since a pair of suction holes 9 are provided in relation to each of the annular suction grooves 4, even a relatively low-capacity exhaust fan can provide sufficient negative pressure to the suction grooves 4. can be caused. Normally, the insert plates 17, 18 are raised to their upper limit position and held in that position by engaging the latch 25 in the lower notch 22. Thus, a suction action is exerted on the annular suction groove 4 over its entire circumference. By passing the core between rotating corrugating rolls 1 and 2, a corrugation is formed on the core, and the corrugated core is carried around the corrugating roll 2. While the core passes around the corrugated roll,
The core is attracted to the corrugated roll by the negative pressure generated in the annular suction groove 4. As mentioned above, and in a conventional manner, glue is applied to the corrugated tops of the adsorbed core and the liner guided around the press rolls 3 is placed inside the glued core. It is laminated to a core, thereby forming a single-sided corrugated board. The formed single-sided corrugated cardboard is separated from the second corrugating roll 2 by being guided by the side edge of the protrusion 30 of the insert plate 18 against the suction action.

When the width of the corrugated board to be manufactured is narrower than the width of the corrugator, the core is passed only through the center of the corrugating rolls 1 and 2, so the annular suction grooves 4 at both ends thereof are
communicates with the atmosphere, and the overall suction effect is greatly reduced. In order to prevent this, it is necessary to prevent the annular suction groove 4 of the corrugated roll 2 exposed to the atmosphere from communicating with the suction chamber 6. Therefore, the insert plate 1 related to the annular suction groove 4
7, 18 are lowered to the lower limit position after removing the latch 25 from the lower notch 22, and are held in that position by engaging the latch 25 again with the upper notch 22. Insert plate 17, 18
is at the lower limit position, insert plate 1
7 and 18 deeply penetrate into the annular suction groove 4 to completely block communication between the suction chamber and the annular suction groove 4 on the side through which the core passes. Therefore, even though the width of the core is narrower than the width of the corrugating roll, no loss of negative pressure occurs.

As described above, the present invention has a very small volume of the suction chamber formed between the arcuate surface of the lower surface of the main body and the second stage roll, and the main body has a suction chamber that communicates with a common suction duct, and is connected to the second stage roll. Since the suction holes are provided in line with the annular suction grooves, the exhaust efficiency by the exhaust fan is very high, and negative pressure exerted on the annular suction grooves can be generated extremely easily with a relatively small exhaust fan. Further, according to the present invention, the suction hole provided in the main body has a sufficiently large dimension (for example, 25φ) compared to the annular suction groove, so that clogging due to paper dust generated from the core during suction action can occur. There is no. Generally, in a method in which the core is held on the corrugated roll by suction, paper dust adheres to the annular suction groove, gradually causing a decrease in the suction ability. According to the present invention, in such a case, all the insert plates are pulled down to the lower limit position and idle operation is performed, so that the paper powder adhering to the annular suction groove is scraped off by the insert plate, and the paper powder facing the suction chamber is removed. The part is removed by suction, and the part on the opposite side falls to the outside. Therefore, paper dust on the annular suction groove can be removed very easily.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of the core holding device according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4 is an insert plate and a latch. FIG. 5 is a partial plan view showing the relationship between the two parts, and FIG. 5 is an elevational view thereof. 1...First stage roll, 2...Second stage roll, 3
... Press roll, 4 ... Annular suction groove, 5 ... Main body, 6 ... Suction chamber, 7 ... Arc surface, 9 ... Suction hole, 10 ... Suction duct, 11 ... Support body, 1
7,18...Insert plate.

Claims (1)

[Claims] 1 Consisting of first and second corrugated rolls that mesh with each other and a press roll that cooperates with the second corrugated roll, a plurality of annular shapes spaced apart in the length direction on the outer peripheral surface of the second corrugated roll A suction groove is provided, and a suction device that generates a negative pressure in the annular suction groove is provided between the first stage roll and the press roll, facing a portion of the second stage roll that is not covered by the core. In the core holding device, the suction device
The main body consists of a narrow suction chamber between an arcuate surface formed on the lower surface of the main body and the circumferential surface of the second stage roll;
Adjacent to both sides thereof, there are suction holes that communicate with the suction duct common to all fabrics, and that are in line with the annular suction grooves of the corrugated rolls and communicated with the suction chambers, and the main body has suction holes along both sides thereof. , the support is provided at intervals so as to constitute a guide groove in line with the annular suction groove, and an insert plate is provided in the guide groove so as to be movable up and down between an upper limit position and a lower limit position. A core holding device in a single-sided corrugated board manufacturing device.