JPH0761824B2 - Width detection device for sheet-shaped member - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a width detecting device for a sheet-like member, and more particularly to a sheet for detecting the width of a photosensitive material such as a film or printing paper processed by an automatic processor. The present invention relates to a width detection device for a strip-shaped member.

[Conventional technology]

In an automatic developing machine that automatically processes development, fixing, washing and drying of a light-sensitive material as a sheet-shaped member, a replenisher solution for exhausting the developer stored in a developing tank according to the processing amount of the light-sensitive material. Need replenishment. The replenishing amount of the replenishing solution is determined by the number and size of the processed photosensitive materials, that is, the area of the photosensitive material immersed in the developing solution,
The area is calculated by detecting the width of the light-sensitive material and the length of the light-sensitive material with the detection device and calculating the product of the width and the length.The replenisher replenishment amount is determined based on the integrated value of this area. We are replenishing.

A conventional detector for detecting the width of a film is shown in FIGS.
As shown in the figure, a transmissive detection device including a plurality of light emitting elements 10A arranged at equal intervals in the width direction of the film, and light receiving elements 10B arranged so as to face each of the light emitting elements 10A. Is used.

According to this detector, since the film passes between the light emitting element 10A and the light receiving element 10B, the light beam emitted from the light emitting element 10A is blocked and the light receiving element 10B is turned off.
The width of the film can be detected from the number of the light receiving elements turned off, and the length of the film can be detected from the time when the light receiving elements are turned off. Further, in order to detect the width of the printing paper, a reflection type detector having a light emitting element and a light receiving element can be used for the same purpose.

[Problems to be solved by the invention]

However, since the width is different depending on the film, a plurality of side-to-side portions of the film are located between the light emitting elements arranged at equal intervals in the film width direction, that is, from the guide reference positions 18A to 18B. In some cases (Fig. 2A)
point). For this reason, there is a problem that the film width detection error becomes equal to the maximum distance between the light emitting elements, and the film width cannot be accurately detected. In order to solve this problem, it is conceivable to shorten the distance between the light emitting elements, but the number of light emitting elements or light receiving elements increases, which causes a problem of high cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a width detection device for a sheet-shaped member that can detect the width of the sheet-shaped member more accurately.

[Means for solving problems]

In order to solve the above problems, the present invention provides a sheet-shaped member based on a signal from a detector that arranges a plurality of detectors in the width direction of a conveyed sheet-shaped member and detects passage of the sheet-shaped member. In a width detection device for a sheet-shaped member that detects a width, the detector is arranged so as to become gradually denser from one end to the other end in the width direction of the sheet-shaped member, and the one end is set as a reference position B, When the width of the sheet-shaped member is larger than 1/2 between the reference position A and the reference position B, one side end portion in the width direction of the sheet-shaped member is set to the reference position B. To the reference position A
And one side end portion in the width direction of the sheet-shaped member is aligned with the reference position A when it is smaller than 1/2 between the reference position B and the reference position B.

[Action]

According to the above configuration, the detector detects the passage of the sheet-shaped member, and the width of the sheet-shaped member is detected based on the signal from the detector.

Here, when the width of the sheet-shaped member is smaller than 1/2 between the reference position A and the reference position B, one side end portion in the width direction of the sheet-shaped member is aligned with the reference position A to form the sheet. The sheet-shaped member is conveyed to detect the width of the sheet-shaped member. When the width of the sheet-shaped member is larger than 1/2 between the reference position A and the reference position B, one side end of the sheet-shaped member in the width direction is aligned with the reference position B to convey the sheet-shaped member. Then, the width of the sheet-shaped member is detected. Since the detectors are arranged in the widthwise direction of the sheet-shaped member so as to gradually become denser from the reference position B toward the reference position A, in either case where the width of the sheet-shaped member is large or when it is large. Also, the other side end of the sheet-shaped member passes through the portion where the detectors are densely arranged.

The width detection error of the sheet-shaped member caused by the passage of the other side end of the sheet-shaped member between the detectors is due to the fact that the intervals between the detectors are close to each other. Equivalent to.

Since the other side end portion of the sheet-shaped member passes through the portion where the detectors are densely arranged, the width of the sheet-shaped member can be detected more accurately without increasing the number of detectors.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the following embodiments, a case where a film is used as the sheet-shaped member and its width is detected will be described.

〔Example〕

First Embodiment A film width detector as shown in FIGS. 3 and 5
A plurality of 10 are attached to a housing 12 that constitutes a part of the device. The detector 10 is composed of a light emitting element 10A and a light receiving element 10B, the light receiving element 10B is attached to a housing 12A forming a film insertion path 14, and the light emitting element 10A is a housing 12B.
Is mounted so as to face the light receiving element 10B. A film insertion table 16 is provided so as to be continuous with the film insertion path 14 formed between the light emitting element 10A and the light receiving element 10B, and the film insertion table 16 is an induction reference for inducing the insertion position of the film 20. The parts 18A and 18B are provided in parallel.
A pair of the guide reference portions 18A and 18B are provided at both end portions of the insertion table 16 so that either one of the side end portions of the film 20 is aligned.

The detector 10 turns off the light-receiving element 10B by interrupting the light beam which is constantly or intermittently emitted from the light-emitting element by the film 20 passing through the film insertion path 14 between the light-emitting element 10A and the light-receiving element 10B. The width of the film 20 is detected after being put into a state.

Next, the arrangement of the detector 10 will be described. FIG. 4 is a schematic view showing the positions of the detector 10 and the attraction reference portions 18A and 18B as seen from the film inserting direction.

As shown in FIG. 4, the detector 10 includes induction reference parts 18A-18B.
They are densely arranged from the half position between them toward the induction reference portion 18A. The arrangement is arranged according to the width of the film 20. That is, the film 20 is located between the induction reference parts 18A and 18B.
A detector for detecting a narrow film 20A having a width of / 2 or less is arranged at a position L ₁ dimension from the guide reference portion 18A. When the width of the medium width film 20B is 1/2 between the guide reference portions 18A and 18B (see L ₂
Dimensions) Trigger the detector to detect the film 20B Reference part 18A, 1
It is arranged at the center position between 8B, that is, at the position of dimension L ₂ from the guide reference portion 18A. The width of the film 20C is significantly larger than the trigger reference part 1
When the distance between 8A and 18B is 1/2 or more (dimension L _{3 in the} figure), the position from the induction reference portion 18B to the dimension L ₃ , that is, the induction reference portions 18A and 18B
A detector is arranged between the center position between them and the attraction reference portion 18A.

The operation of the width detecting device in which the detector 10 is arranged as described above will be described.

To insert the film 20 into the film insertion path 14,
The trigger reference part is changed depending on the width of 20. That is, in the case of a narrow film 20A having a width of 1/2 or less between the attraction reference portions 18A and 18B, one side end of the film 20A is inserted along the attraction reference portion 18A. Since the detector is arranged in advance according to the width of the film, the width can be detected by the other side end portion of the film 20A corresponding to the detector. When the width of the large film 20C is 1/2 or more between the guide reference portions 18A and 18B, one side end of the film 20C is inserted along the guide reference portion 18B. Since the detector is arranged in advance according to the width of the film 20C, the width can be detected by the other side end portion of the film 20C corresponding to the detector. Further, in the above case, since the side end portion of the film passes through the portion where the detectors are densely arranged, even if there is an error in the film, the maximum value of the detection error is suppressed within the arrangement interval of the detectors. .

Second Embodiment A second embodiment shown in FIG. 6 will be described. The mounting of the detector 10 of the second embodiment on the device is the same as that of the first embodiment, so the illustration is omitted and only the arrangement of the detector 10 will be described.

As shown in FIG. 6, the device is one between the induction reference parts 18B and 18A.
They are densely arranged from the position of / 2 toward the invitation reference portion 18A. The arrangement is such that the width of film 20
A plurality of them are arranged around the side edge position of the. That is, a plurality of detectors, each of which the film 20 detects a narrow film 20A having a width of 1/2 or less between the attraction reference portions 18A and 18B, are arranged at a position L ₁ from the attraction reference portion 18B. When the width of the medium width film 20B is 1/2 between the guide reference portions 18A and 18B (L ₂ dimension in the drawing)
A detector for detecting the medium width film 20B is used as the reference unit 18
Plural pieces are arranged at a position 1/2 of A, 18B, that is, at a position of L ₂ dimension from the guide reference portion 18A. Significantly film 20C is the reference part 1
When the distance between 8A and 18B is 1/2 or more (dimension L _{3 in the} figure), the position from the induction reference portion 18B to the dimension L ₃ , that is, the induction reference portions 18A and 18B
A detector is arranged between the position of 1/2 and the attraction reference portion 18A.

The operation of the width detecting device in which the detector 10 is arranged as described above is the same as that of the first embodiment, but in the case of the second embodiment, the side end portion of the film 20 is adjusted to the width of the film 20. Since a plurality of detectors are arranged in the periphery, it is possible to detect more accurately even if the width of the film 20 is slightly changed.

Third Embodiment A third embodiment shown in FIG. 7 will be described. The mounting of the detector 10 of the third embodiment on the device is the same as that of the first embodiment, so that the illustration is omitted and only the arrangement of the detector 10 will be described.

As shown in FIG. 7, the detector of the present embodiment is an induction reference unit.
They are closely arranged from 18B to 18A, and the arrangement is the dimensional positions of L ₁ , L ₂ , L ₃ and L ₄ from the induction reference portion 18A, and L _{1 to} L ₄
The ratio L ₁ : L ₂ : L ₃ : L ₄ is 1: 2: 4: 8.

If the width of the film 20 in such arrayed width detection device detects the width of less than 1/2 of the narrow film 20A between誘動reference portion 18A, 18B is of L ₁ dimension from誘動reference portion 18A The width of the narrow film 20A is detected by the detector arranged at the position. In the case of a large film 20C, that is, between the induction reference parts 18A and 18B 1 /
In case of 2 or more, the film is 20C based on the invitation reference part 18B.
When is inserted, it can be detected by the detector placed at the dimension of L ₂ . According to the above arrangement method, the edge of the film may not correspond to the position of the detector.
In this case, since the detectors 10 are densely arranged from the attraction reference portion 18B toward the attraction reference portion 18A, the side ends of the film 20 are located at the locations where the detectors 10 are densely arranged. . As a result, a more accurate width of the film 20 with less error can be detected. According to the first to third embodiments, the detector 10 is densely arranged from the attraction reference portion of the film 20 toward the other end, and the detector 10 is changed by changing the attraction reference portion according to the width of the film 20. Can reduce the number of

The detector 10 applied to the first to third embodiments has a light emitting element 10A which is reflected by the film 20 when the film 20 is inserted into the film insertion path 14 as shown in FIG.
The width of the film 20 may be detected by the light receiving element 10B receiving the above light. In this case, the light emitting element
Both 10A and the light receiving element 10B are attached to the same housing 12A.

〔The invention's effect〕

According to the present invention, regardless of whether the width of the sheet-shaped member is small or large, the other side end of the sheet-shaped member must pass through the portion where the detectors are densely arranged. Thus, there is an excellent effect that the width of the sheet-shaped member can be detected more accurately without increasing the number of detectors.

[Brief description of drawings]

FIG. 1 is a schematic view showing an outline of a width detecting device for a sheet-like member according to a conventional example, FIG. 2 is an array view showing an array state of detectors in FIG. 1, and FIG. 3 is related to a first embodiment. FIG. 4 is a schematic view in which a width detecting device is attached, FIG. 4 is an array diagram of detectors according to the first embodiment, FIG. 5 is a sectional view showing attachment of detectors, and FIG.
The figure is an array diagram showing an array state of detectors according to the second embodiment,
FIG. 7 is an array diagram showing an array state of detectors according to the third embodiment, and FIG. 8 is a sectional view showing attachment of the detectors. 10 …… Detector 20 …… Sheet member

Claims (1)

[Claims] 1. A sheet-shaped member for detecting a width of the sheet-shaped member based on a signal from a detector for detecting passage of the sheet-shaped member by disposing a plurality of detectors in a width direction of the conveyed sheet-shaped member. In the width detecting device, the detectors are arranged so as to become denser gradually from one end to the other end in the width direction of the sheet-shaped member, the one end is set as a reference position B, and the other end is set as a reference position A. When the width of the sheet-shaped member is larger than 1/2 between the reference position A and the reference position B, one side end of the sheet-shaped member in the width direction is aligned with the reference position B, and Width is reference position A
A width detecting device for a sheet-shaped member, wherein one side end portion in the width direction of the sheet-shaped member is aligned with the reference position A when it is smaller than 1/2 between the reference position B and the reference position B.