JPS5940598B2 - Measure cutting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring a continuously running web.

Generally, when winding a long web, such as a photographic film, into a roll, in order to improve the efficiency of the winding work, the original roll of long film is unwound, measured to a predetermined length, and cut off. There was a need to speed up the work.

Conventionally, for example, a meter roller is used to feed the film a certain distance and then the film is stopped, and a cutter is used to cut the film, or the film is continuously run at a constant speed and the film is moved at a linear velocity in the running direction that is synchronized with the film. Measurement cutting of the film has been carried out by techniques such as cutting the film with a cutting machine.

However, in the former cutting method, the limit for increasing the speed is automatically determined by the acceleration limit that must be applied to the film because the conveyance of the web, such as film, is repeatedly stopped, and in the latter method, the limit for increasing the speed is automatically determined by the limit of the acceleration that must be applied to the film. If the speeds are out of synchronization, the cut shape and sharpness of the cutting section will be affected. For this reason, there have been problems such as it being extremely difficult to strictly maintain the measured amount. Especially when cutting photographic film,
Since photographic frame dots and printing frames are formed as latent images on the film surface in advance, the cutting positions are strictly defined, and it requires a high degree of skill to separate them with a running cutter. The film web strips cut by the above-mentioned method have the drawback of tending to result in equipment with poor cost performance.
Since the web strip is accurately fed one by one to each chute using a conveyor having a large number of chutes as disclosed in the above publication, and the winding operation is started again, it is difficult to handle the web strip after cutting. Even complex methods are required.

SUMMARY OF THE INVENTION It is therefore an object of the invention to overcome the drawbacks of the above-mentioned meter cutting methods and to provide a method for meter cutting continuous webs with improved cost performance and handling.

As a result of various studies regarding the above, the inventors have discovered that the speed difference between the web that is continuously conveyed and the measuring scale cutting unit that is continuously conveyed at a lower speed can be absorbed by a loop forming device installed in the unit. It has been found that the above object can be achieved by a meter cutting method in which the conveyance speed of the web is reduced and the web is metered cut when the relative speed difference between the web and the unit is reduced to zero.

Hereinafter, the invention will be explained in more detail with reference to the embodiments of the drawings.

FIG. 1 is a conceptual diagram showing the main mechanism of a measuring and cutting device used in the method of the invention.

In the figure, 1 is an oval cutting conveyor, and 2 is a measuring and cutting unit that can rotate along the conveyor 1.

Reference numeral 3 denotes a pallet plate of the above unit, and fixed to this pallet plate 3 are a guide roller 4, an elevating guide roller 5, a cutter 6, film clamps A, 7, film clamps B, 8, and a winding spindle 9. It is closed.

Reference numeral 10 denotes a groove made in the pallet plate 3, and the elevating guide roller 5 can move up and down along this groove.

This vertical movement is enabled by a fixed cam (not shown) provided on the back surface of the pallet plate 3 as the pallet plate 3 rotates. In addition, the cutter 6, film clamps A and 7, clamps B and 8, and the winding spindle 9 are similarly constructed so that they can be operated in response to control instructions at the arrival position every moment as the pallet plate 3 rotates. has been done. On the other hand, the film web 11 is fed from the left side of the apparatus in the direction of arrow WO in the figure.

A method for measuring measurement cutting of a film web using the above-described apparatus used in the method of the present invention will now be described.

Now unit 2 is POs. When passing near position 1, the lifting guide roller 5 is in the uppermost position, and the cutter 6, film clamps A and 7, and film clamps B and 8 are also in an open state, so that the film web 11 is stretched straight. Next, unit 2 rotates and POs. When passing near the position indicated by 2, the elevating guide roller 5 has started to descend and is gradually forming a film loop. At this position, the cutter 16, film clamps A and 7, and film clamps B and 8 are still open. As the rotation of unit 2 further progresses, POs. When reaching the position 3, the lifting guide roller 5 has just reached the lowering point, the formation of the film loop 12 has been completed, the lowering movement of the lifting guide roller 5 is also stopped, and the film clamps A, 7 and the film clamp B , 8 are closed, and the cutting operation of the cutter 1 6 is performed.

Then, the unit 2 is POB. 4, the film clamps A and 7 grasp the cut film end, direct it to the take-up spindle 9, and lock the film end to the take-up spindle 9.

When the locking is completed, the film clamps A and 7 fulfill their role and return to the open state. Furthermore, unit 2 is P
Os. When the film reaches the position indicated by 5, the winding of the film by the winding spindle 9 has progressed more than halfway;
Along with this, the lifting guide roller 5 has also reached a position that is more than half way up from the lowering point.

Finally, unit 2 receives POs. Upon arriving at the position indicated by 6, the film clamp A, 7 returns to its original position, i.e. POs.
．． 1, and the film winding operation of the take-up spindle 9 is also completed.

Clamp B moves from its original position to near the spindle while maintaining tension as the spindle winds up.
The lifting guide roller 5 is the POs. 5 to POs. At a certain point in the movement process due to the rotation to 6, it is no longer possible to expect the film web to rise again due to the tension, and furthermore, it will interfere with the movement trajectory of the film clamps B and 8 that will come after that, so the film should be moved from behind the pallet board 3 midway. The fixed cam (not shown) installed on the blade raises the blade itself and returns to the original position. In the method of the present invention, the film web is continuously conveyed as described above, and a unit that is continuously conveyed at a lower speed forms film loops one meter at a time to take in the film web, and the film web speed and winding unit are adjusted. By specifically reducing the relative speed difference to zero, stable and accurate cutting is possible.

Next, as a method of aligning the cutting position strictly defined on the film web soil with the cutter position, for example, as shown in FIG. When inserting, a notch 25 or a round hole 2 is inserted at a predetermined position near the planned cutting position 23 or 24.
This can be done by providing an electrically or mechanically detectable index such as No. 6.

FIG. 3 is an external view of a scale cutting unit as an embodiment suitable for use in the method of the present invention when round holes are provided as detection indicators in the film web.

In the figure, 30 is a pin for searching the web round hole 26, and 31
is a spring that acts to push up this pin 30. Further, 32 is a member that pushes up the spring 31, and 33 is a cam follower rotatably provided at the tip of this member. Reference numeral 34 denotes a fixed cam groove, which is normally fixed to a fixed portion of the conveyor 1 shown in FIG.

Since the unit according to this embodiment is configured as described above, for example, the POs. When the unit reaches position 3, the position of the cam groove 34 becomes higher, and the pin 30 rises due to the upward force exerted by the push-up member 32 and the spring 31, and engages with the round hole 26 of the film web 11.

As mentioned above, POs. At position 3, the difference in the relative speed of the film web 11 with respect to the transport speed of the unit 1 is extremely small, so the distance that the round hole 26 of the film web 11 moves while contacting the pin 30 is so small as to be practically acceptable. Become. Therefore, in this state, the distance of the cutting position can be detected and regulated by the relative position with the round hole 26. Naturally, in this device, the pin 30 is
The spring 31 is also compressed by the resistance caused by the tension of the pin 30, and the pin 30 does not rise. As explained in detail above, according to the method of the present invention, it is possible to stably and accurately cut a continuously running web to a length, and it has succeeded in improving the working efficiency of measuring a film.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a measuring device according to the present invention, Fig. 2 A is a plan view of a film web used in the present invention, and Fig. 3 is a measuring cutting device according to an embodiment of the present invention. FIG. 3 is an external view of the unit. 1゛゜゜...Conveyor, 2...Meter cutting unit, 3...Pallet board, A...Fixed guide roller, 6...Cut one, 7, 8...
... Film clamp, 9 ... Winding spindle, 10 ... Groove, 11 ... Film web.

Claims (1)

[Claims] 1. The speed difference between the continuously conveyed web and the measuring cutting unit equipped with a plurality of rollers that conveys the web that moves at a slower speed is absorbed by a loop forming device provided in the unit, and the web is conveyed. A meter cutting method characterized in that the web is cut to a meter when the relative speed difference between the web and the unit is reduced to zero by reducing the speed.