JPH10329991A - Web feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web feeder in which replacement work of roll paper can be facilitated while a back tension can be uniformly applied to a web fed out from the roll paper without any fluctuation. SOLUTION: A feeding device, which is provided with at least two freely rotational supporting rollers 21a, 21b arranged in parallel and a pair of stoppers 26a, 26b arranged in the roll paper width positions in at least one of the supporting rollers 21a, 21b, is arranged. In addition, a feeding roller 24 pressing roll paper 1 placed on the supporting rollers 21a, 21b, an attaching/detaching means (an oscillating arm 23a, a spring 33 and the like) attaching/detaching the feeding roller 24 to/from the outer circumferential face of the roll paper 1, and a braking means applying braking force to the feeding roller 24 are provided respectively in the feeding device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder installed in a printing machine or the like, and more particularly to a web feeder which feeds a web from a roll of paper wound up and supplies it to a downstream process. .

[0002]

2. Description of the Related Art FIG. 12 shows a web supply apparatus conventionally used in a rotary printing press or the like. In a rotary printing press or the like, a web 1 wound in a roll is usually used, and a necessary amount of paper consumed in printing is supplied as a web 2 to a downstream process (a printing process or the like).
In a conventional general web supply device, the web 1 is rotatably supported in the following manner. That is, as shown in FIG. 12, the support shaft 4 is inserted into the core tube portion (cone portion) 3 of the web 1, and a pair of donut-shaped stoppers 5 a and 5 b fitted on the support shaft 4 are attached to both sides of the web 1. With these stoppers 5 in contact with the width end,
The web 1 is sandwiched between a and 5b, whereby the web 1 is integrally fixed to the support shaft 4. The bearings 7 mounted on the pair of frames 6a and 6b, respectively.
Both ends of the support shaft 4 are rotatably supported at a and 7b.

[0003] The support shaft 4 rotatably supported as described above.
A first gear 8 is coaxially and integrally fixed to one end of the shaft 10 and a second gear 11 is attached to one end of a shaft 10 rotatably disposed via a bearing 9 on one frame 6a. Are fixed coaxially, and these first and second gears 8,
11 are engaged with each other. A powder brake 12 is connected to the other end of the shaft 10 as means for braking rotation.

In setting the loading of the web 1,
One of the bearings 7a and 7b, for example, the bearing 7b is removed from the bearing hole 13 of the frame 6b as shown by a dashed line in FIG. 12, and one end of the support shaft 4 with the web 1 attached thereto is used as a bearing. 7a, and the other end is carried into the bearing hole 13. Under this condition, the bearing 7b is mounted in the bearing hole 13, and the other end of the support shaft 4 is rotatable by the bearing 7b. To support. In this manner, the web 1 is rotatably supported between the frames 6a and 6b.

Thus, the web 2 is fed out from the web 1 rotatably supported as described above and supplied to a downstream printing process or the like as the driving device (not shown) is operated. Have been. At this time, a tension (back tension) is applied to the web 2 to prevent the web 2 from becoming loose or the like in a direction opposite to the feeding direction. That is, when the web 2 is fed from the web 1, the braking force of the powder brake 12 is transmitted to the support shaft 4 (hence, the web 1) via the shaft 10, the second gear 11, and the first gear 8 sequentially. The back tension is applied to the web 2 in response to this.

[0006]

As described above, in the conventional web supply device, the core tube (cone) 3 of the web 1 is provided.
The support shaft 4 is inserted through the support shaft 4, and both ends of the support shaft 4 are
The first gear 8 fixed to the support shaft 4 and the second gear 11 connected to the powder brake 12 mesh with each other while being supported by the frames 6a and 6b via the a and 7b. Because it is configured to add power (back tension), there are structural problems as follows.

[0007] (1) Since the web 1 is fixed to the support shaft 4 and is attached to and detached from the frames 6a and 6b in a state where the web 1 is integrated, the weight becomes heavy, and the web is replaced. Labor is required for the attaching and detaching work at the time. (2) Stopper 5 for regulating both width end positions of web 1
Since it is necessary to fix the stoppers 5a and 5b and the setting work of the web 1 with the screws a and 5b (fixing fittings formed of a donut-shaped disk) to the support shaft 4 with screws, it takes time (time). (3) The back tension at the time of feeding the web fluctuates due to the eccentricity of the web 1 or the like. There are malfunctions.

The present invention has been made to address such various problems, and an object of the present invention is to simplify the operation for replacing and replacing a web, and furthermore, to take out the web from the web. It is an object of the present invention to provide a web supply device having a configuration capable of uniformly applying a back tension to a web without fluctuation.

[0009]

In order to achieve the above-mentioned object, the present invention provides a web feeder which feeds a web from a roll wound web and feeds the web to a downstream process. The support rollers are arranged side by side, and at least one of these support rollers is provided.
A pair of stoppers are provided at the width position of the paper roll of the book, and further, a feeding roller that presses the paper roll placed on these support rollers, and a detachable unit that attaches and detaches the feeding roller to and from the outer peripheral surface of the paper roll, A feeding device provided with a braking means for applying a braking force to the feeding roller is provided. That is, the conventional problem is solved by adopting the above-mentioned configuration instead of the conventional system in which the web is supported via a support shaft inserted into the core tube portion of the web. Further, in the present invention, means for controlling the pressing force of the feeding roller against the web is provided. In the present invention, a powder brake or a disc brake is provided as the braking means at the shaft end of the feeding roller.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 11, the same parts as those in FIG. 12 are denoted by the same reference numerals.

FIGS. 1 and 2 show a web supply device according to the present invention. The web supply device includes a pair of support rollers 21a and 21b disposed below the device and frames 6a and 6b. U-shaped swing arms 23a and 23b, which are swingably arranged around the projecting fulcrum shafts 22a and 22b, respectively, and these swing arms 23a and 23b.
Feeding roller 24 disposed between the tips of 23b
And

Both ends of the support rollers 21a and 21b are connected to bearings 25 mounted on the frames 6a and 6b, respectively.
A pair of stoppers 26a and 26b, which are rotatably supported on the shafts a and 25b about the axis, respectively, and regulate the position of the web 1 in the width direction of the web 1 in the axial direction of the support rollers 21a and 21b, are formed by the support rollers 21a. , 21b and at a position corresponding to the web width position. These stoppers 26a, 26b
It is attached to both of the support rollers 21a and 21b with a space slightly wider than the width of the web 1 (see FIG. 2). The stoppers 26a and 26b may be attached to only one of the support rollers 21a and 21b. On the other hand, both ends of the feeding roller 24 are rotatably supported about their axes by bearings 27a and 27b disposed at the tip portions of the swing arms 23a and 23b. Thus, the support rollers 21a and 21b and the feeding roller 24 are juxtaposed so that their axes are parallel to each other.

A shaft end on one side of the feeding roller 24 (the end on the side of the swing arm 23b in this example) is connected to a braking means 29 via a shaft joint 28. As the braking means 29, a powder brake 30 as shown in FIG. 3 or a disc brake 31 as shown in FIG. 4 is employed. Although not shown, various devices for appropriately controlling the rotation force and the rotation speed of the feeding roller 24 are provided.

Further, as shown in FIG.
a, 23b (the swing arm 23a,
Between the center of rotation of 23b and the center of rotation of the feeding roller 24) and the fixed frame 32, the pressing force of the feeding roller 24 that is in rolling contact with the outer peripheral surface of the web 1 is adjusted. A spring 33 is stretched.

Further, a moving mechanism for moving the position of the feeding roller 24 in accordance with a change in the outer diameter of the web 1 is provided. Various types of this moving mechanism can be adopted. However, the pressing force of the feeding roller 24 engaging with the outer peripheral surface of the web 1 does not fluctuate greatly depending on the outer diameter of the web 1 and the web 1 When the paper is loaded, a function that can move to the retreat standby position and secure a space that does not hinder the work of loading the web 1 is required. FIG. 5 shows an example of the moving mechanism. In this example, a projecting piece 34 is integrally formed on the rear end side of the swing arms 23a and 23b (on the opposite side of the fulcrum shafts 22a and 22b from the location where the feeding roller 24 is disposed), and the projecting piece 34 is formed. A pressing force of the feeding roller 24 that contacts the outer peripheral surface of the web 1 can be controlled by stretching a spring 35 between the fixed frame 32 and appropriately increasing or decreasing the acting force of the spring 35. It has become. FIG. 6 shows another example of the moving mechanism. In this case, an air cylinder 36 is used instead of the spring 35 described above.
By appropriately adjusting the air pressure of the compressed air supplied to the feeding roller 24 as in the case of the above-described example.
Can be controlled.

FIGS. 7 and 8 show another example for controlling the pressing force of the feeding roller 24. FIG. In the case of this example, the air cylinders 37a and 37b configured to extend and contract in conjunction with each other are attached to the fixed frame 32, and these air cylinders 37a and 37b are attached.
Both ends of the feeding roller 24 are directly rotatably supported by head portions (operating portions) a and 37b in a rotatable state. The air cylinders 37a,
The operating direction of the feeding roller 24 by 37b is a vertical direction indicated by an arrow α in FIG.
Is set in a direction corresponding to the diametric direction. Also in the case of this example, the pressing force of the feeding roller 24 can be controlled by appropriately adjusting the air pressure of the compressed air supplied to the air cylinders 37a and 37b.

Although not shown in FIGS. 5, 6, and 7 (shown in FIG. 8), a braking means for braking the rotation is provided on one end shaft of the feeding roller 24. 29 (powder brake, disc brake, etc.)
Are connected.

Next, an example of the structure of the stoppers 26a and 26b provided on the support rollers 21a and 21b will be described. In the example shown in FIG. 9, a pair of donut-shaped disks 38a and 38b are supported by supporting rollers 21a and 21b corresponding to the width of the web 1.
1b, and is fastened and fixed with set screws 39a, 39b. The donut-shaped disks 38a, 38b
The inclined surfaces 50a, 50 chamfered to facilitate the introduction of the web 1 when the web 1 is placed on the outer peripheral corners inside
b is formed.

The example shown in FIG.
a pair of sliding disks 40a, 40b are slidably mounted on the shafts of the webs 1a, 21b in correspondence with the width of the web 1, and the supporting rollers 21 are provided outside the sliding disks 40a, 40b.
The receiving seats 41a and 41b are fixed on the shafts of a and 21b, and compression springs 42a and 42b are mounted between the sliding disks 40a and 40b and the receiving seats 41a and 41b, respectively. The sliding disk 40 by force
a, 40 are configured to be constantly urged toward the inside (the side closer to the center) in the axial direction. In this example,
As clearly shown in FIG. 11, sliding disks 40a, 40b are provided in guide grooves 43 formed in support rollers 21a, 21b.
Guide pins 44 fixed to the support rollers 21a and 21b allow the sliding movement of the sliding disks 40a and 40b in the axial direction of the support rollers 21a and 21b and allow the support rollers 21a and 21b to slide in the inward direction. Disk 40a,
The stop position of 40b is regulated. The sliding disks 40a and 40b are set such that the interval between the inner surfaces facing each other at a position where the guide pin 44 abuts on the inner end surface of the guide groove 43 on the shaft is slightly smaller than the width of the web 1. Compression spring 4 is provided via sliding disks 40a and 40b.
It is configured such that the acting force of 2a and 42b is applied to the web 1.

Thus, the swinging arms 23a and 23b, the springs 33 and 35, and the like constitute a means for attaching and detaching the feeding roller 24. The feeding roller 24, the attaching / detaching means, and the braking means 29 constitute a feeding device for supplying the web 2.

Next, the operation of the web supply device having the above-described configuration will be described as follows. First, the swing arm 23a, about the fulcrum shafts 22a, 22b,
23b, the feeding roller 24 is retracted to a predetermined ascending position (standby position).
The roll-shaped web 1 is carried in between the stoppers 26a and 26b on the first and second rollers 1a and 21b, and is placed on the supporting rollers 21a and 21b. Accordingly, the web 1 is sandwiched between the stoppers 26a and 26b, the position of the web 1 in the width direction is regulated, and the web 1 is arranged at a predetermined position. Subsequently, the web 2 is fed out from the front end of the web 1 and the feeding roller 24 is lowered to wind the web 2 around the feeding roller 24, and the web 2 is sent to the downstream next step. The feeding roller 24
The winding area of the web 2 around the web 2 is in the rotation direction β of the web 1.
This is an area of a half portion (left half portion in FIG. 1) of the feeding roller 24 on the downstream side.

The back tension applied to the web 2 under this condition causes the feeding roller 24 to rotate the web 1
Pressing force to contact the outer peripheral surface of the
By controlling the rotational braking force applied to the feeding roller 24 by the braking means 29 such as the disk brake 31 or the like, the control can be appropriately performed.

According to such a web supply device, the support shaft 4 (see FIG. 12) conventionally used for inserting the web 1 into the core tube portion 3 and supporting the web 1 becomes unnecessary. Accordingly, it is not necessary to perform an operation for integrally fixing the web 1 to the support shaft 4. Further, since the back tension is applied to the web 2 via the feeding roller 24 around which the web 2 is wound, even if the web 1 is eccentric, the back tension can be maintained constant. it can.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
Various modifications and changes are possible based on the technical concept of the present invention. For example, the air cylinder 36 (see FIG. 6) exemplified as the arm swing means and the feeding roller 2
The air cylinders 37a and 37b (see FIGS. 7 and 8) that apply a pressing force to the pressure sensor 4 can be replaced with a hydraulic cylinder or other various power applying means. As a braking means for applying a braking force to the feeding roller 24, various types of braking force applying mechanisms can be employed instead of the powder brake 30 and the disc brake 31 (see FIGS. 3 and 4). In the above-described embodiment, two support rollers 21a and 21b are provided.
More than two support rollers may be provided side by side.

[0025]

As described above, according to the first aspect of the present invention, at least two rotatable support rollers are provided side by side, and a pair of at least one of these support rollers is located at the width position of the take-up paper. A stopper is provided, and further, a feeding roller that presses the web placed on these support rollers, attaching / detaching means for attaching / detaching the feeding roller to / from the outer peripheral surface of the web, and a braking force applied to the feeding roller. Since the feeding device provided with the braking means to be applied is provided, the following operation and effect can be obtained. (1) The loading operation of the web is only required to place the web on at least two lower support rollers while the feeding roller disposed at the predetermined position is retracted to the standby position. Become. In addition, the work of attaching the stopper as in the related art becomes unnecessary. For this reason, the setting operation (load-in / setting operation) of the web is greatly facilitated. (2) Since there is no support shaft to be fitted into the core tube of the paper roll,
Labor saving can be achieved, and the weight can be reduced, so that the workability can be improved accordingly. (3) The back tension is applied to the web by pressing the web with the feeding roller wound around the web, so that the tension of the web fed to the downstream process can be kept constant. (4) These functions make it easy to replace and replace the web, shorten the work time, and feed the web in a state where a stable tension (back tension) is always applied. Becomes

According to the second aspect of the present invention, since means for controlling the pressing force of the feeding roller against the web is provided, the back pressure applied to the web is adjusted by adjusting the pressing force. The tension can be arbitrarily set, and a back tension having an optimal size can be applied to the web as needed.

According to the third aspect of the present invention, since a powder brake or a disc brake is provided as a braking means at a shaft end of the feeding roller, the powder brake or the disc is simple and inexpensive. A braking force can be applied to the feeding roller by the brake, and therefore, it is possible to provide an inexpensive web supply device which can exert various practical effects as described above.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a web supply device according to the present invention.

FIG. 2 is a side view illustrating a configuration of a web supply device according to the present invention.

FIG. 3 is a sectional view showing a powder brake for applying a braking force to a feeding roller.

FIG. 4 is a cross-sectional view showing a disc brake for applying a braking force to a feeding roller.

FIG. 5 is a front view showing an example of a web supply device according to the present invention having a back tension adjusting mechanism.

FIG. 6 is a front view showing another example of the web supply device according to the present invention having a back tension adjusting mechanism.

FIG. 7 is a front view similar to FIG. 5, showing an example in which an air cylinder is used to apply a pressing force to a feeding roller.

FIG. 8 is a side view of a main part of the web supply device of FIG. 7;

FIG. 9 is a side view showing an example of a support structure for a paper roll.

FIG. 10 is a side view showing another example of a web support structure.

11 is an enlarged view of a part indicated by an arrow X in FIG.

FIG. 12 is a side view showing a configuration of a conventional web supply device.

[Explanation of symbols]

 1 web 2 web 21a, 21b support roller 22a, 22b fulcrum shaft 23a, 23b swing arm 24 feeding roller 26a, 26b stopper 29 braking means 30 powder brake 31 disk brake 33, 35 spring 34 projecting piece 36, 37a, 37b air Cylinder 38 Donut disk 40a, 40b Sliding disk 42a, 42b Compression spring 43 Guide groove 44 Guide pin

Claims (3)

[Claims] 1. A web supply device for feeding a web from a web wound in a roll form and supplying the web to a downstream process, wherein at least two rotatable support rollers are provided side by side, and at least two of these support rollers are provided. A pair of stoppers provided at one web width position, a feeding roller for holding the web placed on these support rollers, and attaching / detaching means for attaching / detaching the feeding roller to / from an outer peripheral surface of the web; A web feeding device provided with a feeding device each including a braking means for applying a braking force to the feeding roller. 2. The web supply device according to claim 1, further comprising means for controlling a pressing force of the feeding roller against the web. 3. The web supply device according to claim 1, wherein a powder brake or a disc brake is provided as the braking means at the shaft end of the feeding roller.