JPS6251542A - Web transport apparatus - Google Patents

Abstract

PURPOSE:To perform switching at an arbitrary point of time easily, safely and reliably by providing transport switching means for retreating a web which is stopped to be supplied, from a common transport path at the time of switching. CONSTITUTION:A device which has received a switch command is adapted to stop the leading end of a web at positions of cutters 21, 22, and after that, immediately a transport mechanism starts reversing. A driving system disposed after a pair of rollers 17, 18 is not reversed, and a one-way clutch is installed on the rollers 17, 18. When reversing is started, a web 3A of a photosensitive material roll which has been transported up to now is clamped by transport belts 10b, 11b and returned. The sent back web of the roll 3A is returned to an accumulator chamber 6A and stored there, and the leading end of the web positioned at the cutter positions stays at the forward end portion S1 point of a supply port 8A. On the other hand, the leading end of a web of a photosensitive material roll 3B, which is on standby at S2 point, is passed through a transport path B and once stopped at the cutter 21, 22 position. Thus, switching is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a web conveyance device for selectively pulling out and conveying a web in a copying machine or printer having a plurality of web rolls.

(Prior Art) Various types of apparatuses have been known in which a plurality of web rolls are mounted and webs are selectively drawn out and conveyed from the rolls. A copying machine equipped with a photosensitive material web will be described below as an example.

Conventionally, there have been printers and copying machines that pull out a length of one screen of photosensitive material from a roll of long-wound photosensitive material and perform exposure, printing, development, and fixing processes on the photosensitive material. The long roll of photosensitive material is placed in a light-shielding cassette and loaded directly into the printer or copier in a bright place, or the roll is wrapped in light-shielding paper and placed in the dark box of the printer or copier. There are those in which the operator enters the roll through an operation window with a retractable light-shielding film, removes the light-shielding paper by hand, and then loads the roll into a designated location, and there are also printers and copiers placed in a dark room. There was a system in which the light-shielding paper was removed and the roll was loaded in a predetermined location.

In such an apparatus, it is necessary to change to another photosensitive material roll with a different web width in order to convert the web width to a different size, or to use another photosensitive material roll for copying or printing with different sensitivity performance. It was very time-consuming and troublesome to change the cables. In other words, if the part of the photosensitive material that goes outside the cassette or the part that goes out of the dark box will cause light fogging, the roll of photosensitive material once loaded will be If you want to continue consuming the material until the end, and if you want to convert it in the middle, the part of the photosensitive material that is outside the cassette or dark box should be rewound onto the -H photosensitive material roll, and then placed in a new photosensitive material roll. If the tape had to be repaired and rewinding was troublesome, the part protruding from the outside of the cassette or dark box would be cut out and replaced with a new P-R, even if the damage was severe.

Additionally, there are printers and copiers that are loaded with two or more photosensitive materials, but the switching operations are complicated, and when interrupting one photosensitive material roll and switching to another photosensitive material roll, the former The exposed portion of the photosensitive material p-le is removed and the tip of the latter photosensitive material p-le is loaded at a predetermined position on the conveyance route, which requires a rather troublesome operation. In addition, this method is rarely used when changing web widths or types during the process, and when one roll of photosensitive material is used, the last end is discarded and the next roll of photosensitive material is used. It was commonly used to mean "start."

[The problem that the invention is trying to solve]

As mentioned above, photosensitive material conveyance devices in copiers and printers that use conventional long rolls of photosensitive material waste photosensitive material when converting to a size with a different web width or changing types. It may cause damage or fog, and it requires a long conversion time, making it inefficient and requiring skill to operate. Therefore, we avoided switching midway and only switched to the next roll after one roll was completely used.

It is an object of the present invention to solve these problems and provide a photosensitive material conveying device that allows the above-mentioned conversion to be performed easily and safely at any time.

(Means for solving problems) This problem can be solved by the following technical means.

In the web conveying device comprising: a supply section capable of storing a plurality of web rolls; a conveying means for pulling out and conveying m webs from the unibro rolls from the supply section to a common conveyance path; and a cutter provided on the common conveyance path; The conveyance means is provided with a conveyance switching means for retracting the web whose supply is to be stopped from the common conveyance path when switching to stop the supply from one supply section and switch to the supply from the other supply section. Characteristic web conveyance device.

(Example and operation) FIG. 1 shows an example in which a photosensitive material web is mounted as an example of the present invention. Two long rolls of photosensitive material 3A, 3
B is a case 7 in which the photosensitive material outlet ports 9A and 9B are covered with vinyl to completely block light, and the photosensitive material can be moved in and out without any resistance that would cause damage, and the entire structure is shielded from light. Loaded into 2A and 2B, doors 4A and 4
B is attached to the supply chambers IA and IB by opening and closing them using knobs 5A and 5B.

The leading edge of each photosensitive material is pulled out from the drawer openings 9A and 9B, passes through the 7 accumulator chambers 6A and 6B, and then reaches the supply opening 8A.

SI+8 which corresponds to the entrance of the next stage transport mechanism at the tip of 8B
It is set so that it comes to 2 points. The supply ports 8A, 8B are also covered with velvet 7A, 7B to completely block light and reduce resistance during transportation.

The next stage conveyance mechanism is roller 10. Conveyor belt 10b and p-ra 11 stretched over IOa. A conveyance path A is formed for the web of three long-wound photosensitive material rolls following the supply port 8A by the conveyance bell stretched between the conveyor belt Ilb and the guide plates 14 and 15.
A is sent to a common conveyance path. Also p-ra 11.
Conveyor bell l-11b and roller 12 stretched over Ila
, 12a) to form a conveyance path B for the web of the long photosensitive material roll 3B that continues to the supply port 8B, and a common conveyance path B for the web of the long photosensitive material roll 3B formed by the guide plates 15 and 16. is sent to the conveyance route. p-ra 10, 11, and 12 have the same dimensions,
They are directly connected to gears that are concentric and have the same size, and the gears mesh with each other so that they rotate at the same speed in opposite directions. Therefore, while the web of photosensitive material P-Rule 3A is being transported through the transport path A, the transport path B is being fed in the opposite direction, so the leading edge of the photosensitive material P-Rule 3B remains at the 82 point and is on standby. is in a state. On the contrary, roll 3B
While the web is being conveyed through the conveyance path B, the leading edge of the web on the roll 3A remains at point 81 and is in a standby state.

In this way, the web of either of the photosensitive material rolls 3A, 3B passes through its own dedicated transport path, and the roller pairs 17, 18 and 25, 2 are driven at the same transport speed.
6 by guide plate 19, 20.23, 24.2
7. It is conveyed through a guide chute formed at 28.

At this time, when the photosensitive material web is fed a predetermined length, for example, L+ (approximately 420 jIm) as shown in FIG. Then, the sheets are made into sheets of a predetermined size (if a photosensitive material roll with a web width of KW+ (approx. is approximately equal to the web speed, but at an independent speed that is slower than the web speed, the sheet is conveyed at a speed synchronized with the scanning exposure of the original, and is printed and exposed. or,
The web cut by the cutter is further cut by a certain amount (L+ in the above example)
), the next sheet of the same size (A3 size in the above example) is cut, and the same process is repeated. Of course, if you want to switch from A3 size to A4 size in the middle of printing, you only need to switch the feed amount to L2.

This process can be continued until the same poll is consumed. However, at any point during the process, if it becomes necessary to convert to another roll, for example a roll with a web width W2 as shown in Figure 2, and switch to printing an 84-plate size sheet, a command to that effect is given to the device. and the device enters switching operation. That is, upon receiving this command, the apparatus stops the leading end of the web at the cutter 21.degree. 22 positions, and then the conveyance mechanism immediately begins to rotate in the reverse direction. However, the drive system after roller pair 17.degree. 18 is not reversed, but only has a one-way clutch attached to roller 17.degree. 181C.

When the reversal starts, the photosensitive material roll web 3A, which has been conveyed up to now, is returned while being held between the conveyor belts 10b and llb. At this time, roller 1 is
7 and 18 are rotated in the opposite direction with undue resistance. The web of the roll 3A that has been reversed is returned to the accumulator chamber 6A and stored, and the web tip that was at the cutter position is moved to the tip 81 of the supply port 8A. Stay at the point.

Meanwhile, the leading edge of the web of the photosensitive material roll 3B, which was waiting at point 82 during this time, is held by the belt by the reversal of the conveyor belts 12b and 12b, and passes through the conveyance path B to the cutter 2).
, 22.

This means that the changeover is complete, and the next feed amount (for example, L2 or L4 in Fig. 2) is changed to 84 plates or 85 plates.
It will be set to the plate size and start continuous feeding operation. The stopping at the cutter position and the fixed-dimension feeding mechanism can be performed by detecting the leading edge of the web, or by setting and programming the amount of movement of the conveyor belt or the amount of rotation of the conveyor p-ra in advance using a mechanical sequence. It is also possible to achieve this by letting the machine wait and then feed it by a fixed length.

Further, there are cases where it is necessary to change the photosensitive material roll because the product type is different even though the size is the same, but it is of course possible to do so by issuing an appropriate command when the need arises.

Furthermore, as shown in Figure 2, from a size standpoint, A3
The A4 version was processed with la-ru, and the 84th version and R5 version were 1p.
- If processed using
- The above embodiment can achieve most of the objectives because it can be done in time with the above example, but other sizes shown in Figure 2 include processing for A5 size, 6 size, 86 size, and postcard size. In order to satisfy the above requirements and also to change the product type, it is desirable to be able to switch to three or more photosensitive material rolls.

The second embodiment is designed to meet this purpose, as shown in FIGS. 3 and 4.

In this example, there are five photosensitive material rolls 3A and 3B.

3C, 3D, and 3B are the respective supply chambers (IA to IB
), each with 7 cumulator chambers (6
A to 6B), through the supply port (8A to 8g), to the point corresponding to the entrance of the next stage conveyance mechanism, that is, the web leading edge standby point (S+ -S
s), p-ra 10, 11, 12, 33, 34.3
5 and roller 10a.

A belt 10b is stretched across 11a, 12a, 33a, 34a, and 35a.

Six conveyor conveyor conveyors, each consisting of 11b, 12b, 33b, 34b, and 35b, are provided in a superimposed manner, and each has a dedicated guide chute A, B, C, D, and E.
1, and further joins the same common conveying path as shown in FIG. 1 starting from roller pair 17,18.

In addition, web tip standby holders H+x, HB, H(B, In+Hg) are provided in a part of the supply ports (8A to 8E), respectively, and each holder consists of two holders, and when the holder is closed, This prevents the photosensitive material web from being pulled out and conveyed from the photosensitive material rolls (3A to 3E) by the conveyor, and the holder is open. At this time, the web is ready to be conveyed by the conveyor belt.

In such a conveying device, when there are preceding photosensitive material rolls 38 to 3E, the combination of opening and closing states of the photosensitive material roll to be changed and the web leading edge standby point holder HA-1 (B) is as shown in FIG. , to ensure that photosensitive material rolls can be changed over a wide range.For example, 3A p
If you want to switch from the 3D P-L to the 3D P-L, follow the second line of Case 1 as shown in the system diagram of FIG. 4, and set H input + HD to Or'EN, and set the others to 5HUT. By creating a program according to each case shown in FIG. 4 in this manner, it becomes possible to smoothly and safely switch the P-L.

The present invention has been described above using a copying machine that can be equipped with a web roll as an example, but the present invention is not limited to this. It can also be used for conveying equipment.

〔Effect of the invention〕

The present invention makes it easy to change and use photosensitive material rolls at any time in copying machines and printers that use photosensitive materials. It is now possible to handle materials smoothly, safely, reliably, and efficiently without material loss.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of one embodiment of the present invention, FIG. 2 is a cutaway diagram of sheets of various sizes with respect to the web width of the photosensitive material roll, and FIG. 3 is a schematic sectional diagram of another embodiment of the present invention. Fourth
The figure is a system diagram of a switching program when five rolls of photosensitive material are loaded. IA-IB・ Supply chambers 2A to 2E Cassettes 38 to 3B Photosensitive material rolls 68 to 6E 7 Cumulator chambers 78 to 7B Velvet 8A to 8E Combined supply ports 9A to 9E Photosensitive material outlet ports 10.11, 12, 33, 34.35-Roller 10a,
lla, 1.2a, 33a, 34a, 35a Roller 10b, llb, 12b, 33b, 34b, 35b
゛Transport belt A, B, C, D, Iii, F' ・Transport path, guide chute

Claims (1)

[Claims] In the web conveying device, the web conveying device includes a supply section capable of storing a plurality of web rolls, a conveyance means for pulling out and conveying the web from the web rolls from the supply section to a common conveyance path, and a cutter provided on the common conveyance path. The conveyance means is provided with a conveyance switching means for retracting the web whose supply is to be stopped from the common conveyance path when switching between stopping the supply from one supply section and switching to the supply from the other supply section. web conveyance device.