JPH05319655A - End detecting device of rolled sheet - Google Patents

Abstract

PURPOSE:To prevent the erroneous detection of the end state of sheet wound in a roll before it is laid in the end state, in an end detecting device of rolled sheet for detecting the end state of the sheet by use of a light emitting part and a light receiving part. CONSTITUTION:In an end detecting device for roll sheet which has a light emitting part 4 and a light receiving part 5 in the position for nipping a sheet 1 wound in roll in the cross direction of the sheet 1, and detects that the sheet 1 is laid in the end state by receiving the light from the light emitting par 4 by the light receiving part 5, a light shielding body 9 for regulating the light received by the light receiving part 5 is provided on the front surface side of the light receiving part 5 in such a manner as to be positionally adjustable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll-shaped sheet end detection device for detecting that a roll-wound sheet has reached an end state.

[0002]

2. Description of the Related Art Conventionally, in various devices for pulling out and using a rolled sheet, a roll-shaped sheet end detection device for detecting the end state of the rolled sheet has been used. FIG. 4 and FIG. 5 show the roll sheet end detection device in the related art.
It will be explained based on. Note that this conventional example is a roll-shaped sheet end detection device used in an automatic bagging device for automatically packing products into bags, and the bag-shaped sheet 1 with perforations at regular intervals is rolled. It is wound into a shape.

The bag-shaped sheet 1 wound in a roll is held between a pair of side plates 2 and 3 located in the width direction of the bag-shaped sheet 1. (Not shown). Further, a light emitting portion 4 is attached to one of the side plates 2, and a light receiving portion 5 that receives light emitted from the light emitting portion 4 is attached to the other side plate 3.

In such a structure, when the bag-shaped sheet 1 has a large remaining amount, the light emitted from the light emitting section 4 is shielded by the bag-shaped sheet 1, and the light from the light emitting section 4 is received in the light receiving section 5. Is not received. On the other hand, when the remaining amount of the bag-shaped sheet 1 is low and the end state is reached, the light emitting unit 4
The light from is received by the light receiving unit 5, and a light receiving signal is output from the light receiving unit 5. Then, the bagging operation is forcibly interrupted or the seat end lamp is turned on based on the received light signal, and the worker removes the bag-shaped sheet 1 in the end state and sets a new bag-shaped sheet 1. I am trying to do it.

[0005]

The light from the light emitting section 4 propagates while spreading toward the light receiving section 5 side. Therefore, when the light emitting unit 4 is displaced due to vibration of the device to which the bag-shaped sheet 1 is attached or the like, the light-emitting unit 4 is not affected by the light-emitting unit 4 despite the large amount of the bag-shaped sheet 1. There is a case in which light is received by the light receiving unit 5 and an erroneous detection that the sheet is in the end state is performed. Even in such a case, the bag-shaped sheet 1 is wasted because the bag-shaped sheet 1 having a large remaining amount is replaced with a new bag-shaped sheet 1.

Therefore, in order to prevent the light receiving section 5 from receiving light before the bag-shaped sheet 1 is in the end state, conventionally, the mounting positions of the light emitting section 4 and the light receiving section 5 are adjusted and the light receiving section is adjusted. Although the sensitivity of the light receiving section 5 is lowered by replacing 5 with a low-sensitivity one or changing the resistance value of the variable resistor, such an adjustment takes time and cannot always be surely adjusted. ..

[0007]

[Means for Solving the Problems] A sheet wound in a roll shape is provided with a light emitting portion and a light receiving portion at a position sandwiched in the width direction of the sheet, and light from the light emitting portion is received by the light receiving portion. Thus, in the roll-shaped sheet end detection device that detects that the sheet is in the end state, a light shield that adjusts the light received by the light receiving unit is provided on the front side of the light receiving unit so that the position of the light shielding unit can be adjusted.

[0008]

The light received by the light receiving section is adjusted by adjusting the position of the light shield, and in particular, the light traveling obliquely with respect to the outer peripheral surface of the sheet wound in a roll is shielded and the remaining sheet remains. It is prevented that the light receiving unit receives the light from the light emitting unit while the amount is large and erroneous detection that the sheet is in the end state is performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The same parts as those described in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted. A bag-shaped sheet 1 which is a sheet is wound in a roll shape, and the bag-shaped sheet 1 is held between a pair of side plates 2 and 3 in an automatic bagging device. These side plates 2 and 3 are provided at positions where the bag-shaped sheet 1 is sandwiched in the width direction. A light emitting section 4 is attached to one of the side plates 2 and a light emitting section is provided to the other side plate 3. A light receiving portion 5 for receiving the light emitted from the light source 4 is attached.

Next, a long hole 6 is formed in the side plate 3 at a position close to the light receiving portion 5 in the direction of approaching and separating from the light receiving portion 5, and the long hole 6 is slidable along the long hole 6. The movable member 7 is attached. The movable member 7
Is formed by a mounting portion 8 located on the outer peripheral surface side of the side plate 3 and a light shield 9 located on the inner peripheral surface side of the side plate 3 and adjusting the light received by the light receiving portion 5.
In addition, an elongated hole 11 into which a fastening screw 10 for fastening the movable member 7 to the side plate 3 is inserted into the mounting portion 8.
Are formed.

In such a structure, the operation of the light emitting portion 4 and the light receiving portion 5 is similar to that of the conventional example, and when the bag-shaped sheet 1 has a large remaining amount, the light from the light emitting portion 4 is used as the bag-shaped sheet. The light is blocked by 1 and the light from the light emitting section 4 is not received by the light receiving section 5. On the other hand, when the remaining amount of the bag-shaped sheet 1 is low and the bag is in the end state, the light from the light emitting unit 4 is received by the light receiving unit 5, and the light receiving signal is output from the light receiving unit 5. Then, the bagging operation is forcibly interrupted or the seat end lamp is turned on based on the received light signal, and the worker removes the bag-shaped sheet 1 in the end state and sets a new bag-shaped sheet 1. I am trying to do it.

Next, by loosening the tightening screw 10, the movable member 7 becomes slidable along the elongated hole 6, and after the slidable screw 7 is slid to an arbitrary position, the movable member 7 is tightened by tightening the tightening screw 10. Fixed.

Here, the movable member 7 is slid from the outer peripheral direction of the bag-shaped sheet 1 wound in a roll shape toward the center, and the light-shielding body 9 covers the edge portion side of the light-receiving section 5 to emit light. Light from part 4 and bag-like sheet 1
The light shield 9 prevents light that obliquely travels with respect to the outer peripheral surface of the light from entering the light receiving portion 5. Therefore, even if the automatic bagging device to which the bag-shaped sheet 1 is attached vibrates and the relative position between the light-emitting unit 4 and the light-receiving unit 5 varies, the amount of the bag-shaped sheet 1 remaining is large. The erroneous detection that the bag-shaped sheet 1 is in the end state due to the light from the light emitting section 4 being received by the light receiving section 5 is prevented. Therefore, the bag-shaped sheet 1 can be reliably used even in the end state, and the bag-shaped sheet 1 is not wasted.

To adjust the position of the light shield 9, the tightening screw 10 is loosened on the outer peripheral side of the side plate 3 to move the movable body 7 into the elongated hole 1.
The adjustment can be performed very easily and with high precision because the adjustment can be performed by sliding by using 1 and 6.

In the present embodiment, the bag-shaped sheet used in the automatic bagging apparatus is described as an example of the rolled-up sheet, but the present invention is not limited to the rolled-up sheet. It can also be applied to the end detection of other sheets such as receipt paper and facsimile paper.

[0016]

According to the present invention, the light-emitting portion and the light-receiving portion are provided at positions where the sheet wound in a roll shape as described above is sandwiched in the width direction of the sheet, and the light from the light-emitting portion is received by the light-receiving portion. In a roll-shaped sheet end detection device that detects that the sheet is in an end state by receiving light at a section, a light shield that adjusts the light received by the light receiving section is positionally adjustable on the front side of the light receiving section. The light received by the light receiving section can be adjusted by adjusting the position of the light shield, and in particular, the light that obliquely travels with respect to the outer peripheral surface of the sheet wound in a roll shape is shielded. It is possible to prevent this light from entering the light receiving part by blocking with
Therefore, when the light emitting part is displaced due to vibration or the like, the light from the light emitting part is received by the light receiving part, and the sheet is in the end state despite the large amount of remaining sheet. It is possible to prevent the detection from being performed, so that the seat can be reliably used until the end state is reached, the waste of the seat can be prevented, and the position of the light shield is simply adjusted. Therefore, there is an effect that the light received by the light receiving portion by the light shield can be adjusted easily and accurately.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view.

FIG. 3 is a side view showing the overall configuration.

FIG. 4 is a plan view showing a conventional example.

FIG. 5 is a side view showing an overall configuration of a conventional example.

[Explanation of symbols]

 1 sheet 4 light emitting part 5 light receiving part 9 light shield

Claims (1)

[Claims] 1. A sheet wound in a roll shape is provided with a light emitting portion and a light receiving portion at a position sandwiched in the width direction of the sheet, and the light from the light emitting portion is received by the light receiving portion, whereby the sheet is obtained. In the end detecting device for the roll-shaped sheet for detecting that the light-receiving portion is in the end state, a light-shielding body for adjusting the light received by the light-receiving portion is provided on the front surface side of the light-receiving portion so as to be positionally adjustable Roll sheet end detection device.