JPH0123136Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a negative sheet cutting device that does not cut the negative film loaded on the negative sheet.

Conventional negative sheet cutting devices draw out a rolled negative sheet, detect a detection mark on one edge of the sheet using an optical element, stop it at a predetermined position, and cut the negative sheet to a predetermined length. The cutting operation is started after inserting the cut negative film or when the film is stopped, but the detection mark may be printed incorrectly, the color of the detection mark may be unclear, or the sensitivity of the optical element may be insufficient. In such cases, the stopping position of the negative sheet may shift, and the negative film loaded in the negative sheet may be cut along with the negative sheet.
There was a serious flaw that made complete reproduction of valuable images impossible.

In view of the current situation, the present invention provides a fan for a movable table that is reciprocated on the opposite side of the conveying surface of the negative sheet conveying table in a direction perpendicular to the conveying direction of the negative sheet conveyed along the negative sheet conveying table. Near the cutting blade attached to one end of an arm that is rotatable and pivoted in the direction of contact with the negative sheet and biased by a spring that has a biasing force stronger than the rigidity of the negative sheet but weaker than the rigidity of the negative film. is equipped with a film cut prevention roller whose outer edge protrudes further toward the negative sheet than the cutting blade, and above the opening of the negative sheet conveying table from which the cutting blade and film cut prevention roller can protrude, there is a recess for the cutting blade and a film cut prevention roller. By arranging a guide rail parallel to the lower surface of the recess for the cut prevention roller, when the tip of the film cut prevention roller comes into contact with a negative sheet (the part to be cut) that has no film loaded, the spring By bending the negative sheet against the rigidity of the negative sheet by the urging force of When the tip of the film cutting prevention roller comes into contact with the negative sheet loaded with film, the film cutting prevention roller succumbs to the rigidity of the negative film and is pushed down, and at the same time the cutting blade separates from the negative sheet. Even if there is a printing error in the detection mark on the negative sheet, the color of the detection mark is unclear, or the sensitivity of the optical element is insufficient, this will prevent the film in the negative sheet from being cut. It is possible to provide a negative sheet cutting device that obtains
The present invention will be explained in detail below based on the illustrated embodiments.

First, as shown in FIG. 1, the constituent parts of a film enveloper equipped with a negative sheet cutting device with a film cut prevention device according to the present invention will be summarized. 1 is a main switch, 2 is a negative film reel, and 3 is a negative film reel. is the hub, 4 is the tension roller, 5 is the
is a reel support, 6 is a knob for adjusting the position of the negative film, 7 is a negative film guide, 8 is a roller for driving the negative film, 9 is a start switch, 10
11 is a negative film selection dial, 12 is a selection switch, 13 is a manual switch for cutting negative sheets, 14 is a shaft for mounting a rolled negative sheet, 15 is a negative sheet Winding core, 1
6 is a negative sheet wound into a roll, 17 is a roller for driving the negative sheet, 18 is a mark sensor for the negative sheet, 19 is a guide for feeding the negative cover, 20 is a front plate, 21 is a table for conveying the negative sheet, 4
Reference numeral 2 denotes a guide rail in the negative sheet cutting device with film cutting prevention device according to the present invention.

The configuration of the negative sheet cutting device with film cut prevention according to the present invention will be explained with reference to FIG. 2 and subsequent figures.
It can reciprocate in a direction (width direction of the negative sheet 16) perpendicular to the conveyance direction (direction of arrow A in FIG. 2).
As shown in FIG. 6, the moving mechanism of the moving table 22 includes a slide shaft 2 that determines the moving direction of the moving table 22.
4, 24', a motor 25 that provides driving force, and a timing belt 2 that transmits the driving force to the moving table 22.
6, a belt fixing tool 27, a belt fixing plate 28, etc. The movable base 22 is located at the right end in FIG. 6 when stopped, and is moved from the right end to the left end by the forward rotation of the motor 25, and the sensor 30 at the left end optically or mechanically detects the position detection plate 29 disposed on the movable base 22. When detected, the motor 25 reversely rotates in accordance with the signal, moving from the left end to the right end, and the right end sensor 31 optically or mechanically detects the position detection plate 29, and the motor 25 rotates in accordance with the signal. 25
stops at the right end.

As shown in FIGS. 2 to 5, an arm 34 is pivotally attached to a notch 32 at the upper end of the moving table 22 so as to be rotatable about a support shaft 33, and is urged upward by a spring 35. It is being A circular cutting blade 36 is fixed to one end of the arm 34 with a fixture 37, and if the upper end of the cutting blade 36 becomes dull, the fixture 3
7 and turn the cutting blade 36 a little to fix it again. Reference numeral 38 denotes a film cut prevention roller rotatably mounted near the cutting blade 36, and the diameter of the film cut prevention roller 38 is larger than the diameter of the cutting blade 36.

The negative sheet conveying table 21 has a long hole 39 through which the cutting blade 36 and the tip of the film cutting prevention roller 38 can protrude. Moreover, above the elongated hole 39 of the negative sheet conveying table 21, a guide rail 42 is arranged, which has a cutting blade recess 40 and a film cut prevention roller recess 41 on its lower surface.
The cutting blade recess 40 has such a depth that even when the upper end of the film cutting prevention roller 38 contacts the film cutting prevention roller recess 41 through the negative sheet 16, the upper end of the cutting blade 36 does not come into contact with it. It has to be something. In addition, 43 is a negative film inserted into the negative sheet 16, 18
is a detection unit that detects a detection mark printed on the edge of the negative sheet and issues a signal to stop the negative sheet 16 at a predetermined position.

In the state shown in FIG. 2, the upper end of the film cut prevention roller 38 is in contact with the flexible negative sheet (portion to be cut) 16 on which the film 43 is not loaded, so the film cut prevention roller 38
8 is pushed upward by the bending of the negative sheet 16 and the action of the spring force, and is pressed into contact with the film cut prevention roller recess 41 via the negative sheet 16. At this time, since the cutting blade 36 is also pushed upward together with the film cutting prevention roller 38, the cutting blade 36 can easily reach the negative sheet 16 and cut the negative sheet 16.

In the state shown in FIG. 3, the upper end of the film cut prevention roller 38 is in contact with the negative sheet 16 loaded with the negative film 43, so that the film cut prevention roller 38
The cutting blade 36 succumbs to the rigidity of 3 and is pushed down, and at the same time the cutting blade 36
The negative film 43 is not pushed down and separated from the negative sheet 16, and the important negative film 43 is not cut.

The film cutting prevention roller 38 is connected to the cutting blade 36
The cutting blade 36' may be placed near the two film cutting prevention rollers 38 as shown in FIGS. 7 and 8. It is also possible to arrange it in a state where it is sandwiched between ' and 38'. In the latter case, two film cut prevention roller recesses 41' are naturally required to be provided in the guide rail 42'.

As is clear from the above description, the negative sheet cutting device according to the present invention is equipped with a film cutting prevention roller protruding in the direction of the negative sheet from the cutting blade near the cutting blade. Since the negative sheet is bent when it comes into contact with a place where no film is loaded, the film cut prevention roller moves upward until it comes into pressure contact with the surface of the film cut prevention roller concave part of the guide rail through the negative sheet, and at the same time The cutting blade also moves upward, making it possible to easily cut the negative sheet. However, when the tip of the film cutting prevention roller comes into contact with the part of the negative sheet where the negative film is loaded, the film cutting prevention roller When the cutting blade is pushed down by the rigidity of the negative film, the cutting blade simultaneously separates from the negative sheet and becomes unable to cut, which has excellent practical utility in that it can prevent important negative film from being cut.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an enveloper equipped with a negative sheet cutting device with film cut prevention according to the present invention, and Figs. 2 to 5 show an embodiment of the negative sheet cutting device with film cut prevention according to the present invention. FIG. 2 is a partially cutaway side view showing the state in which the negative sheet is cut, FIG. 3 is a partially cutaway side view showing the state in which the negative sheet cannot be cut, and FIG.
FIG. 5 is a perspective view, FIG. 6 is a schematic diagram showing the moving mechanism of the moving table, and FIGS. 7 and 8 are film cutting prevention according to the present invention. Another embodiment of the attached negative sheet cutting device is shown, and FIG. 7 is a partially cutaway side view showing a negative sheet cutting state, and FIG. 8 is a partially cutaway side view showing a state in which the negative sheet cannot be cut. 16: Negative sheet, 21: Negative sheet conveyance table, 22: Moving table, 24, 24': Slide shaft, 25: Motor, 26: Timing belt, 27: Belt fixing tool, 28: Belt fixing plate,
29: Position detection plate, 30, 31: Sensor, 3
2: Notch, 33: Support shaft, 34: Arm, 35: Spring, 36, 36': Cutting blade, 37: Fixture, 38,
38': Film cut prevention roller, 39: Long hole,
40: recess for cutting blade, 41, 41': recess for film cutting prevention roller, 42, 42': guide rail, 43: negative film.

Claims (1)

[Scope of utility model registration request] A movable table that is reciprocated on the opposite side of the conveying surface of the negative sheet conveying table in a direction perpendicular to the conveying direction of the negative sheet conveyed along the negative sheet conveying table, is capable of fan rotation, and is in contact with the negative sheet. In the vicinity of the cutting blade attached to one end of the pivoted arm, the outer edge is biased by a spring having a biasing force stronger than the rigidity of the negative sheet and weaker than the rigidity of the negative film. A film cutting prevention roller protruding in the direction of the negative sheet is arranged, and above the opening of the negative sheet conveying table from which the cutting blade and the film cutting prevention roller can protrude,
A negative sheet cutting device with a film cut prevention device, characterized in that a guide rail is provided with a recess for a cutting blade and a recess for a film cut prevention roller parallel to each other on its lower surface.