JPH05155495A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To vary the detecting timing of the near end of a sheet formed in the shape of a roll through a simple operation. CONSTITUTION:A sheet 11 delivered from a roll containing part 12 is run around the under side of a tension roller 16 between a fulcrum roller 14 and drive rollers 15a and 15b. The tension roller 16 is supported to the one end of an arm 18 and the other end of the arm is rotatably fixed on a shaft 17. A switch 19 is provided in a position where it is turned ON through rotation of the arm to a given position situated below. The arm has length being regulatable through a simple operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for automatically feeding roll-shaped long sheets from the leading end thereof to the outside, and is used as, for example, an automatic bag filling device for goods.

[0002]

2. Description of the Related Art FIG. 6 shows a main part of a conventional sheet feeding apparatus of this type, in which a long sheet 1 in a roll shape is accommodated in a U-shaped roll accommodating portion 2. Then, the leading end of the sheet 1 accommodated in the accommodating portion 2 is delivered from the delivery port 3, wound around the fulcrum roller 4, and then sandwiched between the pair of drive rollers 5a and 5b. 5b
It was designed to be supplied to the outside by rotation in the direction of the arrow in the figure.

Further, the fulcrum roller 4 and the driving roller 5
a tension roller 6 for winding the sheet 1 downward between a and 5b, and supporting the tension roller 6 at one end,
A sheet detecting mechanism including an arm 8 whose other end is rotatably fixed in the direction of arrow A in the figure by a shaft 7 and a switch 9 which is turned on by rotating the arm 8 to a predetermined downward position is provided. It was being done.

This sheet detecting mechanism operates as follows.
That is, the self-weight of the roll portion of the sheet 1 accommodated in the roll accommodating portion 2 is the rotational moment of the sheet detection mechanism (the self-weight of the tension roller 6 and the self-weight of the tension roller 6) which acts on the opposite side of the fulcrum roller 4 when the sheet 1 is in the initial stage. It is sufficiently larger than the product of the length of the arm 8).
Stops at a position higher than the mounting position of the switch 9 as shown. After that, when the sheet 1 is supplied and the self weight of the roll portion becomes lighter, the tension roller 6 gradually starts to descend along the rotation range of the arm 8. When the tension roller 6 moves down to a predetermined position, the switch 9 is turned on and the end or near end of the sheet 1 is detected.

[0005]

In the conventional sheet feeding apparatus of this type, however, the rotational moment of the sheet detecting mechanism, which is determined by the length of the arm 8 and its own weight, is fixed. The near-end detection timing was uniquely determined. For this reason, in order to allow the user to detect the near end of the sheet at a desired timing, it is difficult to replace the arm 8 and the tension roller 6 with another size.

Therefore, the present invention is intended to provide a sheet feeding apparatus capable of changing the near-end detection timing of a rolled sheet by a simple operation and easily realizing the near-end detection according to a user's purpose. is there.

[0007]

According to the present invention, there is provided a roll accommodating portion for accommodating a roll-shaped long sheet, and the leading end of the sheet fed from this roll accommodating portion is provided between a pair of drive rollers. In a sheet feeding device that nips and feeds a sheet to the outside by the rotation of the drive roller, a tension roller that winds a sheet fed from a roll accommodating section downward between a pair of drive rollers, and the tension roller An arm that is supported at one end and rotatably fixed at the other end, a switch that is turned on by rotating the arm to a predetermined position in the downward direction, and an adjusting means that adjusts at least one of the length and the center of gravity of the arm, It is provided with an informing means for detecting and informing the near end of the rolled sheet by turning on the switch.

[0008]

According to the present invention having such a structure, the rotational moment of the sheet detecting mechanism determined by the tension roller and the arm is changed by adjusting at least one of the length and the center of gravity of the arm by the adjusting means. As a result, the amount of sheets remaining in the roll accommodating portion can be adjusted when the switch is turned on, and the near-end detection timing can be easily changed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an essential part of one embodiment, in which a long sheet 11 in a roll shape is accommodated in a U-shaped roll accommodating portion 12. Then, the front end of the sheet 11 accommodated in the accommodating portion 12 is delivered from the delivery port 13 and wound on the upper side of the fulcrum roller 14, and then the pair of drive rollers 15a,
It is sandwiched between 15b and is supplied to the outside by the rotation of the drive rollers 15a and 15b in the direction of the arrow in the figure.

Further, the fulcrum roller 14 and the driving roller 1
A tension roller 16 that winds the sheet 11 downward between the sheets 5a and 15b, and an arm 18 that supports the tension roller 16 at one end and rotatably fixes the other end by a shaft 17 in the direction of arrow A in the drawing. And a switch 19 that is turned on when the arm 18 is rotated downward to a predetermined position.

The arm 18 comprises a tension roller 16
Is divided into a first arm 21 that supports one end of the shaft and a second arm 22 that is rotatably fixed to the shaft 17 at the other end.

The first arm 21 has an end portion 2 for supporting the tension roller 16 as shown in FIGS.
The end 21b on the opposite side to 1a has a bifurcated structure in which a pair of flat plates are opposed to each other at a predetermined interval in the thickness direction. A through hole 24 into which the connecting screw 23 can be inserted is formed.

At the end 21a of the first arm 21,
A U-shaped concave portion 21c having a bottom portion having a width larger than the width of the sheet 11 is formed, and the tension roller 16 is rotatably supported in parallel to the bottom surface of the concave portion 21c with a predetermined distance d. It is like this. The sheet 11 is inserted through the gap between the concave portion 21c and the tension roller 16 from the front surface to the back surface in FIG.

The second arm 22 has an end 22b opposite to the end 22a fixed to the shaft 17 inserted between the flat plates of the bifurcated end 21b of the first arm 21. It has a detachable flat plate structure, and an elongated hole 25 having a width that allows the connecting screw 23 to penetrate therethrough is formed on the flat plate in the axial direction.

The end portion 22b of the second arm 22 is
Is inserted between the flat plates of the end portion 21b of the first arm 21 in an axially aligned manner, and in that state, the connecting screw 23 is inserted from one through hole 24, and the other through hole 24 is passed through the elongated hole 25.
The first arm 21 and the second arm 22 are further penetrated, and a nut is attached to the tip of the screw to fix the first arm 21 and the second arm 22.
It is designed to connect with. Therefore, the length of the arm 18 can be variably adjusted within the range of the longitudinal direction of the long hole 25 by the insertion amount of the second arm 22.
(Adjusting means)

In FIG. 1, the microprocessor 26
Is a control unit main body of this sheet feeding apparatus, and inputs a signal of the switch 19 through an input port 27 and outputs a drive signal to the drive rollers 15a and 15b through an output port 28. It is like this. Further, a keyboard 30 provided with a supply start key, a supply stop key, and the like via an I / O (input / output device) controller 29, and a display as a notification means for displaying information such as the end or near end of the seat 11 31 is connected.

In this embodiment having such a structure, when the sheet 11 accommodated in the roll accommodating portion 12 is in the early stage,
Since the own weight of the roll portion is sufficiently larger than the rotational moment of the sheet detection mechanism (product of the own weight of the tension roller 16 and the length of the arm 18) acting on the opposite side to the fulcrum roller 14, the tension roller 16 is As shown in FIG. 1, the switch 19 is stopped at a position higher than the mounting position.

When the sheet supply start key of the keyboard 30 is operated in this state, the pair of drive rollers 15a and 15b are rotated by the control of the microprocessor 26, and the roll-shaped sheet is lifted to drive the drive roller 15.
It is supplied to the outside from between a and 15b. As a result, the self-weight of the roll portion of the sheet 11 gradually becomes lighter, and the tension roller 16 begins to gradually descend along the rotation range of the arm 18. Then, as shown in FIG. 3, when the tension roller 16 moves down to a predetermined position and the arm 18 comes into contact with the switch 9 and is turned on, the signal from the switch 9 is input to the microprocessor 26, and the microprocessor 2
By the control of 6, the near-end detection information of the sheet 11 is displayed on the display 31 and the drive rollers 15a, 15
The rotation operation of b is stopped.

Then, when the user confirms that the near end of the sheet 11 is detected, a cylindrical weight prepared in advance at the core portion (hollow) of the roll as shown in FIG. 4 is used. While the member 32 is being packed, the sheet 11 that has already been fed out is slightly unwound to raise the tension roller 16 slightly along the rotation range of the arm 18. Then, the weight of the roll becomes heavier by the weight member 32, so the tension roller 16 stops above the switch 9.

When the sheet supply start key is operated again in this state, since the switch 9 is released, the rotation of the drive rollers 15a and 15b is controlled, and the remaining sheets 11 are controlled.
Supply is resumed. After that, when the end of the sheet 11 comes off the core of the roll, the tension roller 16 falls and the switch 9 is turned on again, the sheet end is displayed on the display 31, and the sheet feeding operation is stopped.

When the switch 9 is turned on for the first time, the turning-on timing is determined by the balance between the own weight of the sheet roll accommodated in the sheet accommodating portion 12 and the rotational moment of the sheet detecting mechanism. Further, in this embodiment, as described above, the length of the arm 18 can be variably adjusted within the range of the longitudinal direction of the long hole 25 formed in the second arm 22. Therefore, the opening timing of the first switch 9 can be arbitrarily determined by variably adjusting the length of the arm 18 and adjusting the rotation moment of the seat rotation mechanism to a desired value.

As described above, according to the present embodiment, the tip of the second arm 22 is accommodated in the roll accommodating portion 12 by a simple operation by changing the amount of insertion into the rear end bifurcation of the first arm 21. Since the near end detection timing of the formed sheet 11 can be changed, the near end detection suitable for the user's purpose can be easily realized.

In the above embodiment, the rotation moment of the seat detecting mechanism is changed by adjusting the length of the arm 18 to change the near end detection timing of the seat 11, but the center of gravity of the arm 18 is shifted. By doing so, it is possible to change the rotation moment of the sheet detection mechanism. For example, as shown in FIG. 5, an elongated hole 41 is formed in the axial direction of an arm 18 in which one end supports the tension roller 16 and the other end is rotatably fixed to a shaft 17. Then, a weight member 42 that slidably contacts the inside of the long hole 41 is provided so that the weight member 42 can be fixed at a desired position of the long hole 41. By doing so, the balance of the arm 18 can be shifted within the movement range of the weight member 42, so that the rotational moment of the seat detection mechanism can be changed to a desired value by a simple operation, and in comparison with the above embodiment. The structure of the arm 18 is simple and can be realized at low cost.

It is also possible to provide both a mechanism for adjusting the length of the arm 18 and a mechanism for adjusting the center of gravity, and adjust both the length and the center of gravity of the arm 18 to obtain a desired near-end detection timing. Is.

[0026]

As described above in detail, according to the present invention, the near-end detection timing of a rolled sheet can be changed by a simple operation, and the near-end detection suitable for the user's purpose can be easily realized. A supply device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 2 is a plan view of the arm in FIG.

FIG. 3 is an explanatory view of the operation of the embodiment.

FIG. 4 is an explanatory view of the operation of the embodiment.

FIG. 5 is a plan view showing a modified example of the arm.

FIG. 6 is a configuration diagram of a main part of a conventional example.

[Explanation of symbols]

11 ... Sheet, 12 ... Sheet accommodating portion, 14 ... Support roller, 15a, 15b ... Drive roller, 16 ... Tension roller, 18 ... Arm, 19 ... Switch, 21 ... First arm, 22 ... Second arm, 23 ... connecting screw, 24 ... through hole, 25, 41 ... elongated hole, 32, 42 ... weight member.

Claims (1)

[Claims] 1. A roll accommodating portion for accommodating a long roll-shaped sheet, wherein the leading end of the sheet fed out from the roll accommodating portion is nipped between a pair of drive rollers, and the drive roller is rotated. In the sheet feeding device that feeds the sheet to the outside by means of the: An arm whose end is rotatably fixed, a switch which is turned on by turning the arm to a predetermined position in the downward direction, an adjusting means which adjusts at least one of a length and a center of gravity of the arm, and a switch which is turned on. And a notification unit for detecting and reporting the near end of the rolled sheet.