JPH05201410A - Packaging apparatus - Google Patents

Abstract

PURPOSE:To make any of articles of different sizes packable easily by a method wherein packaging sheets in different breadths can be supplied optionally to specified positions for an apparatus in which the article to be packaged is dropped into an opening provided on a packaging table and is wrapped up in the packaging sheet with its four sides gathered up. CONSTITUTION:The end of a packaging sheet 1 wound up in a roll is caught with a drawing mechanism 58, and the packaging sheet 1 is drawn out by making the drawing mechanism move in reciprocation over a packaging table 2 equipped with an opening 2a to which a spherical article to be packaged is thrown in. The drawn-out packaging sheet 1 is cut at a specified position with a cutter 70. In cutting the packaging sheet, the movement of the drawing mechanism 58 is controlled in view of its position detected by a position sensor 88 and by a signal for setting the breadth for the packaging sheet 1 from a breadth setting means so that the packaging sheet 1 comes to a specified position over the opening 2a on the packaging table 2 when the drawing mechanism 58 stops. Furthermore, an abnormality can be judged by output from the position sensor 88 while existence of the drawing mechanism 58 is detected by an optical sensor 87.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing device for agricultural products in which a spherical object to be packed (for example, vegetables such as lettuce and cabbage, or fruits such as melon and apple) is wrapped in a packing sheet.

[0002]

2. Description of the Related Art There are the following packaging devices as described above. That is, a packaging table having an opening through which the article to be packaged falls is provided, the packaging sheet cut to a predetermined length is placed on the packaging table, and the article to be packaged is dropped into the opening from above. As a result, the packaging sheet is squeezed at the outer edge of the opening and the object to be packaged is wrapped in the packaging sheet and supported by the lower support table, after which the excess portion of the squeezed packaging sheet is cut and the packaging sheet This is a configuration in which fastening is performed.

In the packaging apparatus as described above, as a pre-stage of the packaging operation, there is provided a pulling-out mechanism for pulling out a wide packaging sheet wound in a roll shape and supported by a predetermined length on the packaging table. is there. In this case, for example, in FIG.
Further, as shown in FIG. 22, a pulling mechanism 104 capable of holding the end portion of the packaging sheet 101 and reciprocally movable on the packaging table 105, and a cutter 102 for cutting the roll-shaped portion side of the packaging sheet 101 are provided. With the structure described above, the drawer mechanism 104 moves to the left side of the paper sheet from the state shown in FIG. 21 to clamp the end of the packaging sheet 101, and then the drawer mechanism 104 moves to the right side of the paper sheet to move the packaging sheet 101. It is pulled out on the packaging table 105. As shown in FIG. 22, the packaging sheet 101 is provided with marks 101a at predetermined intervals along the longitudinal direction thereof.
When the optical sensor 106 provided in the vicinity of 02 detects the mark 101a of the packaging sheet 101, the pull-out mechanism 1
04 is stopped and the cutter 102 cuts the packaging sheet 101. In this way, the distance between the marks provided on the packaging sheet corresponds to the predetermined length of the packaging sheet to be cut, and the pulling-out mechanism 104 is arranged after the cutting as shown in FIG.
2, the packaging sheet 101 further moved to the right side of the drawing and cut at a predetermined position on the opening 105a of the packaging table 105.
To position.

[0004]

The above-mentioned structure is designed for the case where one type of packaging sheet having a constant width is used. However, due to the diversification of the crops to be harvested, the type and size of the packaged item. Therefore, there is a demand for packaging using packaging sheets with different widths. According to the present invention, a plurality of types of packaging sheets having different widths can be pulled out and cut to a predetermined length so that they can be moved to a predetermined position on an opening of a packaging base, and a pulling-out mechanism has a packaging sheet. The purpose is to make it possible to detect and determine abnormalities when pulling out the robot at the same time.

[0005]

The feature of the present invention resides in that the packaging apparatus as described above is provided with the following configuration. That is, [1] a pull-out mechanism that reciprocates on the packaging table so as to sandwich the end portion of the rolled-up packaging sheet and draw it on the packaging table, and a roll-shaped portion side of the drawn packaging sheet. Detects the presence of a cutter that cuts at a predetermined position, the presence or absence of marks that are provided at predetermined intervals along the longitudinal direction of the packaging sheet, and the presence or absence of a drawer mechanism at the clamping position where the drawer mechanism clamps the end of the packaging sheet. The optical sensor provided in the vicinity of the holding position, the position sensor that continuously detects the position of the pull-out mechanism, and the pull-out mechanism when the optical sensor detects the mark after the packaging sheet starts to be pulled out by the pull-out mechanism. And a setting signal from the setting means for setting the type of the width of the packaging sheet. By the position signal from the position sensor, the first
Second control means for moving and operating the drawer mechanism so that the packaging sheet comes to a predetermined position on the opening of the packaging table from the position where the drawer mechanism is stopped by the control means, and the drawer for the next packaging sheet drawer When the mechanism has moved to the sandwiching position, which is the position of the optical sensor, and the optical sensor detects the presence of the drawer mechanism, and the position sensor's position signal does not correspond to the sandwiching position, it indicates an abnormal condition. The packaging device is configured to include abnormality detecting means for making a determination.

[2] A pulling mechanism that reciprocates on the packaging table so as to sandwich the end portion of the packaging sheet wound in a roll shape and to draw it on the packaging table, and a roll-shaped portion of the drawn packaging sheet. A cutter that cuts a predetermined position on the side,
The presence or absence of marks provided at predetermined intervals along the longitudinal direction of the packaging sheet and the presence or absence of the drawer mechanism at the sandwiching position where the drawer mechanism sandwiches the end of the packaging sheet are detected. The optical sensor provided in, and the position sensor that continuously detects the position of the pull-out mechanism, when the optical sensor detects the mark after the pull-out mechanism starts to pull out the packaging sheet, the pull-out mechanism is stopped and the cutter is cut. The first control means, the setting means for setting the width of the packaging sheet, and the setting signal from the setting means and the position signal from the position sensor, from the position where the pull-out mechanism is stopped by the first control means, to the packaging sheet. The second control means for moving and operating the drawer mechanism so that the packaging sheet comes to a predetermined position on the opening of the packaging table, and the packaging sheet is pulled out. When the pulling mechanism starts to pull out, even if the pulling mechanism passes a position separated by a predetermined distance from the planned stop position where the pulling mechanism is stopped by the first control means to the sandwiching position side for a predetermined time, the optical sensor If the mark is not detected, the packaging device is configured to include an abnormality detection unit that determines an abnormal state.

[3] A pulling-out mechanism that reciprocates on the packaging table so as to sandwich the end portion of the packaging sheet wound in a roll and can be pulled out on the packaging table, and a roll-shaped portion of the pulled-out packaging sheet. A cutter that cuts a predetermined position on the side,
The presence or absence of marks provided at predetermined intervals along the longitudinal direction of the packaging sheet and the presence or absence of the drawer mechanism at the sandwiching position where the drawer mechanism sandwiches the end of the packaging sheet are detected. The optical sensor provided in, and the position sensor that continuously detects the position of the pull-out mechanism, when the optical sensor detects the mark after the pull-out mechanism starts to pull out the packaging sheet, the pull-out mechanism is stopped and the cutter is cut. The first control means, the setting means for setting the width of the packaging sheet, and the setting signal from the setting means and the position signal from the position sensor, from the position where the pull-out mechanism is stopped by the first control means, to the packaging sheet. By the second control means and the first control means for moving and operating the drawer mechanism so that the package comes to a predetermined position on the opening of the packaging table. When the feeding mechanism is stopped, the optical sensor detects the mark, and if the position signal of the position sensor does not correspond to the setting signal from the setting unit, an abnormality detecting unit for determining an abnormal state is provided. Configure packaging equipment.

[0008]

[Action]

[I] With the configuration described in [1] above, the withdrawal of the packaging sheet in the packaging device of the present invention is performed as follows. The state shown in FIGS. 2 and 9 is a state in which one packaging is completed, and the pulling-out mechanism 58 moves to the holding position on the cutter 59 side in order to pull out the packaging sheet 1 for the next packaging on the packaging table. It is in a state of being. Then, as shown in FIG. 10, the drawer mechanism 58 stops at the sandwiching position to sandwich the end portion 1b of the packaging sheet 1, and the drawer mechanism 58 moves to the right side of the paper as shown in FIG. Is pulled out on the packaging table. Packaging sheet 1 as shown in FIG.
Marks 1d are provided at predetermined intervals along the longitudinal direction of. As a result, the packaging sheet 1 is pulled out, and the mark 1d of the packaging sheet 1 reaches the position of the optical sensor 87 and the optical sensor 8 as shown in FIGS.
When 7 detects the mark 1d on the packaging sheet 1, the pull-out mechanism 58 stops and the cutter 59 (see FIG. 2).
Thus, the roll-shaped portion side of the packaging sheet 1 is cut. When the cutting by the cutter 59 is completed, as shown in FIG.
A distance N1 (corresponding to the distance between another mark 1c of the packaging sheet 1 and the opening 2a of the packaging table 2 in the structure shown in FIG. 7),
The pull-out mechanism 58 moves to the right on the paper surface and stops so that the cut packaging sheet 1 comes to a predetermined position on the opening 2a of the packaging table 2 (in the structure shown in FIG. The mark 1c is placed on the opening 2a of the packaging table 2).

In the packaging apparatus of the above item [1], a plurality of types of packaging sheets having different widths can be used according to the size and type of the article to be packaged, and then the plurality of types of packaging sheets are used. The case of using will be described.
As shown in FIG. 8, it is assumed that packaging sheets 1, 89, and 90 having three types of horizontal widths of large, medium, and small are used. In this case, the marks 1d and 89 are provided according to the respective packaging sheets 1, 89 and 90.
b and 90b are provided at different intervals along the longitudinal direction. Each mark 1 on this packaging device
Since the distance between d, 89a, and 90a is the cut length of the packaging sheet, the mark 1 is selected according to the type of the packaging sheet so that an appropriate cutting length can be obtained with respect to the width of the packaging sheet.
The predetermined intervals of d, 89a and 90a are set to be different. As a result, when the wrapping sheets 1, 89, 90 are pulled out by the pulling-out mechanism 58 as shown in FIG. 8, the position at which the pulling-out mechanism 58 stops based on the detection of the optical sensor 87, that is, the wrapping sheets 1, 8
The positions of the ends 1b, 89c, 90c of 9, 90 are different from each other. On the other hand, since the position of the opening 2a of the packaging table 2 does not change, each packaging sheet 1, 89,
When the pull-out mechanism 58 is slid so that 90 is at a predetermined position on the opening 2a, the distances N1, N2, N3
Will be different. In this case, since the setting means for setting the width of the packaging sheet and the position sensor for continuously detecting the position of the drawer mechanism are provided, one of three types of packaging sheets having different widths was used. In this case, the above-mentioned distances N1 and N corresponding to the setting signal from the setting means
2 and N3 are set, and the position sensor detects that the pull-out mechanism has moved by the distances N1, N2, and N3, and the stop operation is performed. As a result, the packaging sheets having different widths and cut lengths come to predetermined positions on the opening of the packaging table.

The above-mentioned packaging apparatus [1] has an abnormality detecting function when the above-mentioned packaging sheet is pulled out. Next, this abnormality detecting function will be described.
As shown in FIG. 9, it is assumed that the one-time wrapping is completed and the pull-out mechanism 58 returns to the holding position. In this case, since the sandwiching position of the drawer mechanism 58 and the position of the optical sensor 87 correspond to each other, when the drawer mechanism 58 returns to the sandwiching position side and the optical sensor 87 enters the detection state, the drawer mechanism 58 moves to the sandwiching position. It can be inferred that the optical sensor 87 has detected the pull-out mechanism 58 that has returned and is in the clamping position.
In this case, if each part is normal, the position signal of the position sensor that detects the position of the pull-out mechanism should also correspond to the holding position. Therefore, in this case, if the position signal of the position sensor does not correspond to the sandwiched position, it is determined that some abnormality has occurred. Examples of this abnormality include a state in which the position signal and the position of the pull-out mechanism do not accurately correspond to each other due to an abnormality in the position sensor, and the pull-out mechanism has not yet returned to the clamping position due to an abnormality in the optical sensor. There is a state where the optical sensor is in the detection state.

[II] When configured as in the above item [2],
Similar to the case [1] and the above-mentioned [I], the drawing and cutting of the packaging sheet and the setting and changing of the drawing amount after cutting are performed corresponding to the packaging sheets having different widths. The packaging apparatus of the above item [2] is provided with the following as abnormality detection when the packaging sheet is pulled out. As shown in FIG. 11, it is assumed that the pull-out mechanism 58 normally holds the ends of the packaging sheets 1, 89, 90 and pulls them out to the right side of the drawing. In this case, when the pull-out mechanism 58 reaches the positions of 1b, 89c, 90c in FIG. 8, the optical sensor 87 causes the marks 1d, 8 of the packaging sheets 1, 89, 90.
Upon detecting 9b and 90b, the pull-out mechanism 58 stops at the above-mentioned position. In this case, the drawer mechanism 58
The position (a position slightly left from the position of 90c on the paper surface) which is apart from the scheduled stop position by a predetermined distance on the side of the holding position is set. As a result, if the position sensor detects that the drawer mechanism 58 has passed the above-mentioned front position if the respective parts are normal, the optical sensor 87 should detect the marks 1d, 89b, 90b by a predetermined time from this point. is there. Therefore, it is determined that some abnormality has occurred if the optical sensor does not become the detection state for a predetermined time after the position sensor detects that the drawer mechanism has passed a position slightly before the planned stop position. Of. Examples of this abnormality include, for example, a state in which the position sensor detects that the pull-out mechanism has passed this position even though the pull-out mechanism has not passed the above-mentioned position due to the abnormality in the position sensor, and the abnormality in the optical sensor. There are some cases where the optical sensor cannot detect the mark on the packaging sheet.

[III] According to the constitution of the preceding paragraph [3], as in the case of the preceding paragraph [1] and the above-mentioned [I], the packaging sheet is pulled out and cut, and after the packaging sheet having different widths is cut. The withdrawal amount is set / changed. The packaging apparatus of the above item [3] is provided with the following as abnormality detection when the packaging sheet is pulled out. As shown in FIG. 8, the pull-out mechanism 58 has 1b, 89
The optical sensor 87 reaches the mark 1
d, 89c, 90c are detected, and the pull-out mechanism 58 is set to 1
It is assumed that the vehicle stops at positions b, 89c, and 90c. After this,
The wrapping sheets 1, 89, 90 are cut by the cutter, and the distances N1, N2, N3 (in the structure shown in FIG. 8, the other marks 1c, 89a, 90a of the wrapping sheets 1, 89, 90).
And a distance corresponding to the opening 2a of the packaging table 2), the pulling mechanism 58 moves to the right side of the drawing and stops, and the cut packaging sheets 1, 89, 90 are placed on the opening 2a of the packaging table 2. (The other marks 1c, 89a, 90a of the packaging sheets 1, 89, 90 in the structure shown in FIG.
It is arranged so as to come on the opening 2a of the packaging table 2). In this case, once the packaging sheet to be used is determined, the distance N1, N2, N3 at which the pulling mechanism should be moved after cutting by the cutter, that is, depending on the packaging sheet to be used,
The position where the drawer mechanism should stop (1b, 89c,
The position 90c) should be uniquely determined. Therefore,
When the drawer mechanism is stopped, if the position signal of the position sensor of the drawer mechanism does not correspond to the position where the drawer mechanism should be stopped, it is determined that some abnormality has occurred. Examples of this abnormality include a state in which the drawer mechanism is stopped at the position where it should be stopped due to an abnormality in the position sensor, but a position signal corresponding to this is not output, and the drawer mechanism is stopped as described above. Although the position signal of the position sensor corresponds to this position after stopping at the desired position, the setting itself of the type of the packaging sheet by the setting means is incorrect (the type of the packaging sheet is artificially set. In that case, the setting operation is wrong, and when the type of the packaging sheet is automatically detected, the detection is an erroneous detection).

[0013]

According to the first, second and third aspects of the present invention,
The optical sensor that detects the mark on the packaging sheet and the position sensor that detects the position of the drawer mechanism cut the packaging sheet to the length corresponding to each packaging sheet even if the packaging sheet with different width is used, and package the cut packaging sheet. It is now possible to bring it to a predetermined position on the opening of the table. As a result, the range of objects to be wrapped can be widened, and the performance and workability of the packaging device can be improved. And
Check for abnormalities in the state where the drawer mechanism comes to hold the end of the packaging sheet for the next wrapping, the state where the packaging sheet is pulled out to some extent, and the state where the drawer mechanism pulls out the packaging sheet for a predetermined length and stops. Can be detected,
The performance and workability of the packaging device could be further improved. In this case, since the above-mentioned optical sensor and position sensor are used both for the original pull-out / stop function and for the abnormality detection, it is advantageous in that the parts can be shared and the structure can be simplified.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire packaging device of the present invention.
The packaging work in this packaging device is performed in the following steps. That is, the step of dropping the article A to be packed from above into the opening 2a of the packaging table 2 on which the packaging sheet 1 is placed (this is done by the operator), by dropping into the opening 2a. The step of wrapping the article A to be packaged with the packaging sheet 1 and supporting the article A to be packaged with the support table 3 below the packaging table 2, the upper side of the packaging sheet 1 enclosing the article A to be packaged on the support table 3 The step of narrowing down the part from the lateral direction, the step of cutting out the upper part of the narrowed down packaging sheet 1, the cut-out packaging sheet 1
Step of attaching the adhesive tape 4 to the portion, a step of pressing the attached adhesive tape 4 from above, a step of laterally ejecting the packaged object A from the support base 3, and a roll shape in preparation for the next packaging. The packaging sheet 1 wrapped around the
This is a step of pulling out a predetermined length above, cutting the roll side portion, and placing one packaging sheet 1 on the packaging table 2.

(1) First, the structure of each mechanism in the step of drawing the packaging sheet 1 for the next packaging operation onto the packaging table 2 as the final step of one packaging operation will be described.
As shown in FIGS. 1 and 2, the transparent packaging sheet 1 is wound in a roll shape and supported by a pair of supporting rollers 56a and 56b, and the tip of the packaging sheet 1 is paired with upper and lower feeding rollers 57a and 57b. It is pinched. Support frame 61 extended from the support roller 56a on the right side of the drawing
The upper feeding roller 57a is supported by
The gear 62 fixed to the support roller 56a is the support frame 6
1 is engaged with the gear 63, and the gear 63 and the feeding roller 5
A transmission chain 64 is laid across 7a. A drive gear 65 for driving the gear 62 and a motor 66 are provided, and the support roller 56 a and the feeding roller 57 are provided.
a is rotationally driven, and another supporting roller 56b and another feeding roller 57b are freely rotated.

Next, the first pedestal 67 and the second pedestal 68 that support the packaging sheet 1 from below when the packaging sheet 1 is cut will be described. As shown in FIGS. 2 and 5, on the lower right side of the feeding rollers 57a and 57b in the plane of the drawing, a flat plate-shaped first pedestal 67 and second pedestal 68 having a width wider than the lateral width of the packaging sheet 1 are provided. The first pedestal 6 is provided at a predetermined interval (for a cutter 59 described later to enter).
The second pedestal 68 is set at a position slightly lower than the second pedestal 68.

Next, a cutter 5 for cutting the packaging sheet 1
9 and the like will be described. As shown in FIGS. 3 and 4, guide poles 69 are provided on the left and right sides of the first and second pedestals 67 and 68, and the support frame 70 is slidable vertically on the guide poles 69 via the boss portion 70a. It is supported. One drive shaft 82 is rotatably installed under the second pedestal 68, and the operation plate 8 is fixed to the left and right of the drive shaft 82.
2a and the left and right boss portions 70a of the support frame 70, and a link 83 is laid between them.
A transmission chain 85 is provided so as to span the drive shaft 82.

A flat plate-shaped cutter 59 having a width wider than the width of the packaging sheet 1 is fixed to the support frame 70, and a plate-shaped pressing member 60 having a width of about 1/2 of the packaging sheet 1 is used as the cutter. There are four in total, two on the front left and right of 59 and two on the rear left and right. Each holding member 6
A rubber material 60a is attached to the lower surface of 0, and each pressing member 60 is vertically movable on the support frame 70, and
It is provided in a state of being urged downward by the spring 60b. Then, as shown in FIG. 2, the rubber material 60 a of the pressing member 60 is set to project below the lower end of the cutter 59 when the support frame 70 is in the raised state.
With the above structure, when the drive shaft 82 is driven to rotate once in the state shown in FIG. 3, the cutter 59 descends to cut the packaging sheet 1 and returns to the position shown in FIG. 3 again as described later.

Next, the pull-out mechanism 58 for pulling out the packaging sheet 1 onto the packaging table 2 will be described. As shown in FIG. 2, the guide rails 2b are provided on both the left and right sides of the packaging table 2.
A pair of support plates 71 are slidably supported along the sprocket 72, and the sprocket 72 is supported on the left and right of the end on the second cradle 68 side of the packaging table 2 and on the left and right of the opposite end. A pair of left and right chains 73 is wound around the sprocket 72, and the left and right chains 73 are connected to the left and right support plates 71. As a result, the left and right sprockets 72 on the second pedestal 68 side are driven in the forward and reverse directions by the motor 91 (see FIG. 18), so that the drawer mechanism 58 (left and right support plates 71) is slid along the packaging table 2. To do.

As shown in FIGS. 1, 2, and 6, a single support shaft 74 is provided over the left and right support plates 71, and five operation arms 58a are independently rocked on the support shaft 74. The rubber plate 5 is freely fitted on the back surface of the tip of the operation arm 58a.
8b is fixed. A flat plate-shaped pedestal 76 is erected and fixed on the lower side of the operation arm 58a across the left and right support plates 71. In this case, as shown in FIG. 2, the support plate 71 is located slightly below the second pedestal 68 on the cutter 59 side.
The pedestal 76 is set to be positioned. Then, one frame 75 laid across the left and right support plates 71
A spring 77 for urging each operation arm 58a toward the swinging side of the pedestal 76 is provided between the operation arm 58a and each operation arm 58a.

The support shaft 74 is rotatably supported with respect to the support plate 71, and as shown in FIGS.
Arms 74a are fixed to the left and right of
One rod 74b is erected and fixed across a. A link 79 is provided so as to span a fan-shaped gear 78 that is swingably supported by one support plate 71 and one arm 74a, and a motor 80 and a pinion gear 81 that drive the fan-shaped gear 78 are provided. There is. In the state shown in FIG. 2, the motor 80 is driven to pull down the rod 74b and each operation arm 5
8a is being lifted from the pedestal 76, and when the motor 80 is driven in the reverse direction to pull up the rod 74b as described later, the urging force of each spring 77 causes each operation arm 58a to descend to the pedestal 76 side. The packaging sheet 1 is sandwiched between them.

(2) Next, the initial state of the packaging work for installing the roll-shaped packaging sheet 1 on the support rollers 56a and 56b will be described. As will be described later, when the packaging sheets 1 having different widths are installed on the support rollers 56a and 56b, the center of the width of the roll-shaped portion of the packaging sheet 1 is located at the center of the widths of the support rollers 56a and 56b regardless of the width. That is, in other words, when the wrapping sheet 1 is pulled out by the pull-out mechanism 58 as described later, the second mark 1d of the wrapping sheet 1 shown in FIG. ..

As shown in FIG. 18, a cutting switch 93 that can drive only the motor 84 for the cutter 59 and a feeding switch 94 that can drive only the motor 66 for the support roller 56a and the feeding roller 57a are provided. There is. When the cut switch 93 is pressed once,
The motor 84 operates from the state shown in FIG.
Descends, then rises to the original position again, and the motor 84 stops. The feeding switch 94 is biased to the return side,
Only while the push-out switch 94 is being pressed,
The motor 66 for the support roller 56a and the feeding roller 57a operates, and when the feeding switch 94 is released, the motor 66 stops.

The vicinity of the first end of the packaging sheet 1 is shown in FIG.
In many cases, the unprinted extra portion such as the first mark 1c as shown in FIG. Therefore, the wrapping sheet 1 is installed, and the first end of the wrapping sheet 1 is provided with the upper and lower feeding rollers 57a,
When it is inserted between 57b, the feeding switch 94 is pushed and the extra portion of the packaging sheet 1 is fed. Then, the first first mark 1c is placed at a predetermined position (see FIG.
And, as shown in FIG. 12, when the end 1b of the packaging sheet 1 to be cut comes to a position reaching directly below the cutter 59), the feeding of the packaging sheet 1 is stopped, and the cutting switch 93 is pressed and operated. Cut off the excess and remove it.

(3) Packaging sheet 1 for the next packaging operation
The flow of operation of each mechanism in the process of pulling out the paper onto the packaging table 2 will be described. When the packaging sheet 1 is installed as in the above (2) and the activation switch 95 of the packaging device shown in FIG. 18 is pressed, a single packaging operation as described later in (6) is performed. However, in this case, since the article A to be packaged has not been put into the opening 2a of the packaging table 2, the packaging apparatus will be idle.

The state shown in FIGS. 1 and 2 is a state in which one wrapping is completed, and the pulling-out mechanism 58 causes the cutter 59 to pull out the wrapping sheet 1 for the next wrapping onto the wrapping table 2.
Before and after moving to the side. Then, as shown in FIG. 9, when the drawer mechanism 58 reaches the holding position which is the position of the second pedestal 68 and stops (the operation arms 58 a of the drawer mechanism 58 are lifted from the pedestal 76), the drive is performed. The gear 65 is driven to rotate the support roller 56a in the clockwise direction and the feeding roller 57a is driven to rotate in the counterclockwise direction, and the end portion 1b of the packaging sheet 1 is fed from the second cradle 68 to the pull-out mechanism 58 side. Going away.

The drive gear 65 makes one rotation, and the notch portion 65a (see FIG. 2) of the drive gear 65 having no gear teeth moves to the gear 62.
Motor 66 is stopped, the support roller 56a is stopped.
The feeding roller 57a also stops. In this state, as shown in FIG. 9, the end portion 1b of the packaging sheet 1 sufficiently enters between the operation arm 58a of the drawer mechanism 58 and the pedestal 76, so that the motor 80 of the drawer mechanism 58 operates next. The rod 74b is pulled up, and the operating arms 58a are lowered toward the pedestal 76 by the urging force of the springs 77.
As shown in 0, the end portion 1b of the packaging sheet 1 is held between the operation arms 58a and the pedestal 76.

Next, as shown in FIG. 11, the pull-out mechanism 58 moves to the right side of the drawing with the end portion 1b of the packaging sheet 1 held therebetween, and the packaging sheet 1 is pulled out onto the packaging table 2. In this case, the cutout portion 65a of the drive gear 65 has the gear 6
Since the gear 62 is in a state of being able to freely rotate in opposition to 2, the gears 62, 63, the support roller 56a,
56b and the feeding rollers 57a, 57b freely rotate as the packaging sheet 1 is pulled out, as shown in FIG.

As shown in FIG. 7, the packaging sheet 1 is transparent, but the first mark 1c indicating the type and manufacturer of the article A to be packaged is placed at the center position in the width direction of the packaging sheet 1 in the longitudinal direction. Are printed at predetermined intervals along the line. The second mark 1d is printed at a position away from the center of the first mark 1c along the lateral width direction by a first predetermined distance L1 and at a position away from the center of the first mark 1c by a second predetermined distance M1 in the longitudinal direction. .. As shown in FIGS. 1 and 7, a frame 86 fixed to the packaging table 2 is provided with a reflective optical sensor 87 including a light emitter and a light receiver.

With the structure described above, the packaging sheet 1 is pulled out by the pulling-out mechanism 58, and the packing sheet 1 shown in FIGS.
2, the second mark 1d of the packaging sheet 1 reaches the position of the optical sensor 87, and the detection light from the light emitter of the optical sensor 87 is reflected by the second mark 1d and detected by the light receiver of the optical sensor 87. Then, the drawer mechanism 58 is temporarily stopped at that position. In this case, as shown in FIGS. 12 and 2, when the drive gear 65 is rotationally driven in the counterclockwise direction of the drawing by a predetermined angle and the gear teeth of the drive gear 65 mesh with the gear 62,
The motor 66 stops at this angle. As a result, the gears 62 and 6 which were freely rotated when the packaging sheet 1 was pulled out.
3, the support rollers 56a and 56b, and the feeding rollers 57a and 57b are also stopped, and the pull-out mechanism 58
The rotation of the roll-shaped portion of the packaging sheet 1 is stopped at the same time as the above, and there is no wrinkling or wrinkling between the roll-shaped portion of the packaging sheet 1 and the pull-out mechanism 58.

Next, as shown in FIG. 13, the support frame 70 provided with the cutter 59 and the pressing member 60 is operated to descend (the above is equivalent to the first control means). In this case,
As shown in FIG. 5, the rubber member 60a of the pressing member 60 projects below the lower end of the cutter 59, so when the support frame 70 is moved down, the four pressing members 60 in front of and behind the cutter 59 are The packaging sheet 1 is pressed against the first and second pedestals 67 and 68 to hold the packaging sheet 1. Next, the cutter 59 attaches the first and second pedestals 67, 68.
The packaging sheet 1 is cut at a stretch by entering the space. When the wrapping sheet 1 is pulled out and cut in this manner, the first mark 1c is located at the center in the longitudinal direction of the cut wrapping sheet 1 as shown in FIG.

When the cutting of the packaging sheet 1 is completed in the state shown in FIG. 13, the supporting frame 70 having the cutter 59 and the pressing member 60 is operated to move up to the original position,
As shown in FIGS. 14 and 7, the pull-out mechanism 58 moves to the right side of the drawing by a distance N1 (the distance between the first mark 1c of the packaging sheet 1 and the opening 2a of the packaging table 2), and stops and cuts. The first mark 1c of the formed packaging sheet 1 is placed at the position of the opening 2a of the packaging table 2 (see FIG. 7B) (corresponding to second control means). After that, each operation arm 58a of the pullout mechanism 58 is lifted from the pedestal 76 to separate the end portion 1b of the packaging sheet 1, and one packaging sheet 1 cut to a predetermined length is placed on the packaging table 2. Is done.

As shown in FIGS. 1 and 18, the second cradle 6
The sprocket 72 on the eighth side is provided with a potentiometer 88 (corresponding to a position sensor) to detect the position of the pullout mechanism 58. In this case, the operation of stopping when the pulling-out mechanism 58 reaches the holding position (see FIG. 9) which is the position of the second receiving base 68, and the first mark 1c of the cut packaging sheet 1 of the packaging base 2 The two operations of stopping when the pull-out mechanism 58 reaches the position (see FIG. 7B) where it reaches the position of the opening 2a are the potentiometer 88.
It is based on the detection signal from. And FIG.
As shown in (a), when the packaging sheet 1 is pulled out to the length to be cut (corresponding to the pulling position), the pulling mechanism 5
The operation of stopping 8 is performed based on the detection of the optical sensor 87.

(4) In this packaging apparatus, three types of packaging sheets 1 having different widths depending on the size of the article A to be packaged 1,
89 and 90 are configured so that they can be used. Next, a description will be given of a configuration in which the pull-out length is changed corresponding to these three types of packaging sheets 1, 89 and 90. As shown in FIG. 8, packaging sheets 1 and 8 having three types of width, large, medium and small
9, 90, the first marks 1c, 89a, 90a are located at the center positions of the packaging sheets 1, 89, 90 in the lateral width direction.
It is printed at predetermined intervals along the longitudinal direction. In this case, the narrower the width of the packaging sheet 1, 89, 90, the first
The predetermined interval between the marks 1c, 89a, 90a is narrow. From the center of the first marks 1c, 89a, 90a to the first predetermined distance L1 (common to each wrapping sheet 1, 89, 90) along the lateral direction, from the center of the first marks 1c, 89a, 90a,
The second marks 1d, 89b, 90b are printed at positions rearward in the longitudinal direction by the second predetermined intervals M1, M2, M3. In this case, the packaging sheet 1 having a large width has a second predetermined distance M1, and the packaging sheet 89 having a medium width has a second predetermined distance M2.
The packaging sheet 90 having a small width has the second predetermined interval M3.

The position of the optical sensor 87 on the packaging device side does not change with respect to the packaging sheets 1, 89 and 90 described above.
Therefore, as shown in FIG. 8, when the wrapping sheets 1, 89, 90 are pulled out by the pulling-out mechanism 58, the position at which the pulling-out mechanism 58 is stopped based on the detection of the optical sensor 87, that is, the wrapping sheets 1, 89, 90. End 1b of the
Since the positions of 89c and 90c are different from each other, the first marks 1c, 89a and 90a are located at the centers in the longitudinal direction of the respective wrapping sheets 1, 89 and 90 cut.

In each of the packaging sheets 1, 89 and 90, FIG.
In the state shown in, each packaging sheet 1, after cutting
When the drawer mechanism 58 is slid so that the first marks 1c, 89a, 90a of 89, 90 are located in the opening 2a of the packaging table 2, the distances N1, N2, N3 are different from each other. In this case, the packaging sheet 1 having a large width has a distance N1, the packaging sheet 89 having a medium width has a distance N2, and the packaging sheet 90 having a small width has a distance N3.

Therefore, when one of the three types of packaging sheets 1, 89, 90 having different widths is selected, the operator operates the selection switch 92 (corresponding to the setting means) shown in FIG. 18 in advance. A distance suitable for the selected packaging sheets 1, 89, 90 is selected from the distances N1, N2, N3 and set. As a result, after cutting, the pulling-out mechanism 58 moves by the distance N1, N2, N3 suitable for each wrapping sheet 1, 89, 90, and each wrapping sheet 1, 89, 9
The first marks 1c, 89a, 90a of 0 are located in the opening 2a of the packaging table 2 (corresponding to the second control means).

(5) In this packaging device, the drawing mechanism 5
8 is provided with an abnormality detection function for movement and stop as described above. Next, regarding this abnormality detection function, FIG.
A description will be given based on 0. As shown in FIG. 9, it is assumed that the one-time wrapping is completed and the pull-out mechanism 58 returns to the holding position. In this case, since the operation arm 58a of the pull-out mechanism 58 enters directly below the optical sensor 87, the detection light from the light emitter is reflected and the optical sensor 87 enters the detection state (ON state). Therefore, when the optical sensor 87 is in the ON state (step S1), if the potentiometer 88 for the drawer mechanism 58 shown in FIG. 1 does not output a signal corresponding to the holding position (step S2), the optical sensor 87 or When it is determined that the potentiometer 88 has an abnormality, the packaging is temporarily stopped and the buzzer sounds (step S3) (corresponding to abnormality detecting means).

On the contrary, when the optical sensor 87 is in the non-detection OFF state (step S1), if the potentiometer 88 for the drawer mechanism 58 shown in FIG. 1 outputs a signal corresponding to the holding position ( In step S4), it is determined that the optical sensor 87 or the potentiometer 88 is abnormal, the packaging is temporarily stopped, and the buzzer sounds (step S4).
3).

Next, as shown in FIG. 11, the pull-out mechanism 5
It is assumed that 8 normally holds the end portion 1b of the packaging sheet 1 and pulls out the packaging sheet 1 to the right side of the drawing. in this case,
The potentiometer 88 detects that the pull-out mechanism 58 has passed a predetermined position on the side of the cutter 59 slightly on the left side of the drawing with respect to the position where the end 90c of the small-width packaging sheet 90 is pulled out (the position of the end 90c in FIG. 8). Then, if each part is normal, within a predetermined time thereafter, the drawer mechanism 5
8 is an end portion 1b of the packaging sheets 1, 89 and 90 shown in FIG.
89c, 90c position is reached, packaging sheets 1, 89, 9
The second marks 1d, 89b, 90b of 0 are the optical sensors 87.
Will be reached directly below.

When the pull-out mechanism 58 has passed the above-mentioned predetermined position (step S5) and the predetermined time has passed (step S6), if the optical sensor 87 is not turned on (step S7), the pull-out failure or the optical sensor is detected. It is determined that the detection error is 87 (corresponding to the abnormality detecting means). In this case, the drawer mechanism 58 is temporarily stopped and the cutter 59 is operated to cut the packaging sheet 1, and at the same time, the drawer mechanism 58 is pulled out.
Is returned to the clamping position shown in FIG. 9, and the packaging sheet 1 is again clamped and pulled out (steps 11 and 12). Then, if such a drawing failure or a detection failure of the optical sensor 87 occurs several times in succession (steps S8, S).
9), the packaging is paused and the buzzer sounds (step S1).
0).

Next, it is assumed that the pull-out mechanism 58 has passed the above-mentioned predetermined position (step S5), and after a predetermined time has elapsed (step S6), the optical sensor 87 is turned on. In this case, the drawer mechanism 58 is stopped at the positions of the ends 1b, 89c, 90c of the packaging sheets 1, 89, 90 shown in FIG. 8, and when the cutting of the packaging sheets 1, 89, 90 is completed, the drawer mechanism 58 is shown. Moves a distance N1, N2, N3. Then, if the stop position of the pull-out mechanism 58 is at the position of the end portion 1b, after that, it moves by the distance N1.
That is, the position of the end 1b and the distance N1, the position of the end 89c and the distance N2, and the position of the end 90c and the distance N3 correspond to each other.

In this case, the packaging sheets 1, 89,
According to 90, one of the distances N1, N2, and N3 should have been set by the selection switch 92 shown in FIG. 18, but as described above, the position where the drawer mechanism 58 is stopped,
Distances N1, N2 set by the selection switch 92
It may be different from N3 (step 13). Therefore, when the packaging in such a state is performed several times in succession (steps S14 and S15), the packaging is temporarily stopped and the buzzer sounds (step S16) (corresponding to abnormality detecting means).

(6) After the one wrapping sheet 1 cut into the predetermined length as described above is placed on the wrapping table 2, the step of wrapping the article A to be packed will be described. .. As shown in FIG. 15 (a), first, when the article A to be packaged is dropped into the opening 2a of the packaging table 2, the article A to be packaged is dropped into the lower support table 3 while being wrapped by the packaging sheet 1. ..
When the operator pushes the start switch 95 shown in FIG. 18 in this state, the support base 3 is lowered as shown in FIG. 15B, and the packaging sheet 1 is squeezed at the outer edge of the opening 2a. .. In this case, a plurality of rubber plate-shaped auxiliary diaphragm members 11
Is provided below the opening 2a so as to surround the article A to be packaged, and the auxiliary squeezing member 11 is configured to further squeeze the packaging sheet 1.

Next, the pair of plate-shaped holding members 14 arranged on the lower side of the packaging table 2 are shown in FIGS.
As shown in (a), it proceeds to the side of the packaging sheet 1 and narrows down the upper portion 1a of the packaging sheet 1. As a result, the article A to be packaged is substantially completely wrapped in the packaging sheet 1. After this, as shown in FIG. 16A, a pair of disc cutters 2
8 advances along the upper surface of the sandwiching member 14, and the upper portion 1a of the packaging sheet 1 is cut off.

Next, as shown in FIG. 16B, the adhesive tape 4 cut to a predetermined length is placed over the upper end of the packaging sheet 1 and the end of the sandwiching member 14, and the adhesive tape 4 shown in FIG. As shown in, the sponge member 47 presses the adhesive tape 4 from above. Then, while the adhesive tape 4 is being pressed by the sponge 47, as shown in FIG. 17A, the pair of holding members 14 are operated to be opened, and the sponge member 47 is again pressed to the side of the article A to be adhered. Make sure that the tape 4 is firmly attached to the packaging sheet 1.

After that, as shown in FIG. 17B, the posture of the support base 3 is changed sideways, and the article A to be packaged is transferred to the side slide 55 and discharged to the outside of the apparatus. The state of the object A to be packaged thus completed is shown in FIG.
Shown in. When one wrapping is completed as described above, the process returns to the item (3) and the next wrapping sheet 1 is pulled out and cut.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a packaging device viewed from above.

FIG. 2 is a side view of the supporting structure of the roll-shaped portion of the packaging sheet, the cutter and the pressing member, and the vicinity of the drawing mechanism.

FIG. 3 is a side view showing a lifting structure of a cutter and a pressing member.

FIG. 4 is a front view showing a lifting structure for a cutter and a pressing member.

FIG. 5 is a plan view of the roll-shaped portion of the packaging sheet and the vicinity of the feeding roller.

FIG. 6 is a plan view of the drawer mechanism.

FIG. 7 is a plan view showing a state in which a packaging sheet is pulled out and stopped by a pulling mechanism.

FIG. 8 is a plan view when three types of packaging sheets having different widths are pulled out by a pulling mechanism.

FIG. 9 is a side view showing a state in which the packaging sheet is being fed to the pull-out mechanism side that has reached the holding position.

FIG. 10 is a side view showing a state where the pulling-out mechanism holds the end portion of the rolled-out packaging sheet.

11 is a side view showing a state where the pulling-out mechanism pulls out the packaging sheet from the state of FIG.

FIG. 12 is a side view showing a state where the second mark on the packaging sheet is detected by an optical sensor and the pulling-out mechanism is stopped.

FIG. 13 is a side view showing a state where the cutter is cutting the packaging sheet after the state shown in FIG. 12;

FIG. 14 is a side view showing a state in which the pulling-out mechanism pulls out the packaging sheet after the state of FIG. 13;

FIG. 15 is a perspective view showing a flow of packaging from insertion of the packaged object into the opening to narrowing down of the packaging sheet by the sandwiching member.

FIG. 16 is a perspective view showing the flow of packaging from the cutting of the upper portion of the packaging sheet to the pressing of the adhesive tape by the sponge member.

FIG. 17 is a perspective view showing a packaging flow from the opening operation of the holding member to the discharging of the packaged article and a state in which the packaging is completed.

FIG. 18 is a circuit diagram showing a linked state of each switch, motor, and operation cylinder.

FIG. 19 is a flowchart showing the first half flow of control of abnormality detection when the packaging sheet is pulled out.

FIG. 20 is a flowchart showing the latter half of the flow of control for abnormality detection when pulling out a packaging sheet.

FIG. 21 is a perspective view showing a conventional structure for pulling out a packaging sheet.

FIG. 22 is a plan view showing a conventional packaging sheet drawing structure.

[Explanation of symbols]

 1, 89, 90 Packaging sheet 1b, 89c, 90c Packaging sheet end 1d, 89b, 90b Packaging sheet mark 2 Packaging table 2a Packaging table opening 58 Drawer mechanism 59 Cutter 87 Optical sensor 88 Position sensor 92 Setting means A Items to be packaged

Claims (3)

[Claims] 1. A packaging table for mounting packaging sheets (1), (89), (90) cut to a predetermined length and provided with an opening (2a) into which a spherical object (A) is dropped. (2) is provided, and the article to be packaged (A) is inserted into the opening (2a) from above.
When dropped, the packaging sheets (1), (89), (90) on the packaging table (2) are squeezed at the outer edge of the opening (2a), and the article to be packaged (A) becomes the packaging sheet (1). ), (8
9) A packaging device configured to be wrapped in (90), the packaging device having the configurations described in [A] to [O] below. [A] The packaging sheets (1) and (8) wound in a roll shape
9) and (90) end portions (1b), (89c), (90
a pull-out mechanism (58) that reciprocates on the packaging table (2) so that it can be pulled out on the packaging table (2) while sandwiching c);
Also, the packaging sheets (1), (8) that have been pulled out.
9), a cutter (59) for cutting a predetermined position on the roll-shaped portion side of (90). [A] Marks (1) provided at predetermined intervals along the longitudinal direction of the packaging sheets (1), (89), (90)
d), (89b), (90b) and the presence of the drawer mechanism (58) for the packaging sheets (1), (89), (90).
The presence or absence of the pull-out mechanism (58) at the sandwiching position for sandwiching the ends (1b), (89c), (90c) of the optical sensor (8) is provided near the sandwiching position.
7) and a position sensor (88) for continuously detecting the position of the pull-out mechanism (58). [C] After the packaging sheets (1), (89), (90) start to be pulled out by the pulling-out mechanism (58),
The optical sensor (87) causes the marks (1d), (89)
b) and (90b) are detected, the pull-out mechanism (5
8) A first control means for stopping the cutter (59) and stopping the cutter (59). [D] Setting means (92) for setting the width type of the packaging sheets (1), (89), (90), and a setting signal from the setting means (92) and the position sensor (8)
According to the position signal from 8), the packaging sheets (1), (89) and (90) are opened from the position where the pulling-out mechanism (58) is stopped by the first control means (1). Second control means for moving and operating the drawer mechanism (58) so that the drawer mechanism (58) is located at a predetermined position. [E] In the case where the drawer mechanism (58) has moved to the holding position which is the position of the optical sensor (87) in order to draw out the next packaging sheet (1), (89), (90), The optical sensor (87) has a pull-out mechanism (5
Abnormality detecting means for judging an abnormal state if the position signal of the position sensor (88) does not correspond to the sandwiched position while the presence of 8) is detected. 2. A packaging table for mounting packaging sheets (1), (89), (90) cut into a predetermined length and provided with an opening (2a) into which a spherical article (A) is dropped. (2) is provided, and the article to be packaged (A) is inserted into the opening (2a) from above.
When dropped, the packaging sheets (1), (89), (90) on the packaging table (2) are squeezed at the outer edge of the opening (2a), and the article to be packaged (A) becomes the packaging sheet (1). ), (8
9) A packaging device configured to be wrapped in (90), the packaging device having the configurations described in [F] to [U] below. [F] The packaging sheets (1) and (8) wound in a roll shape
9) and (90) end portions (1b), (89c), (90
a pull-out mechanism (58) that reciprocates on the packaging table (2) so that it can be pulled out on the packaging table (2) while sandwiching c);
Also, the packaging sheets (1), (8) that have been pulled out.
9), a cutter (59) for cutting a predetermined position on the roll-shaped portion side of (90). [G] Marks (1) provided at predetermined intervals along the longitudinal direction of the packaging sheets (1), (89), (90)
d), (89b), (90b) and the presence of the drawer mechanism (58) for the packaging sheets (1), (89), (90).
The presence or absence of the pull-out mechanism (58) at the sandwiching position for sandwiching the ends (1b), (89c), (90c) of the optical sensor (8) is provided near the sandwiching position.
7) and a position sensor (88) for continuously detecting the position of the pull-out mechanism (58). [H] After the packaging sheets (1), (89), (90) start to be pulled out by the pulling-out mechanism (58),
The optical sensor (87) causes the marks (1d), (89)
b) and (90b) are detected, the pull-out mechanism (5
8) A first control means for stopping the cutter (59) and stopping the cutter (59). [K] Setting means (92) for setting the width type of the packaging sheets (1), (89), (90), and a setting signal from the setting means (92) and the position sensor (8).
According to the position signal from 8), the packaging sheets (1), (89), (90) are opened from the position where the pulling-out mechanism (58) is stopped by the first control means (1). Second control means for moving and operating the drawer mechanism (58) so as to come to a predetermined position on 2a). [U] When the packaging sheets (1), (89), (90) start to be pulled out by the pulling-out mechanism (58), the first control means causes the pulling-out mechanism (58) to stop from the planned stop position. The optical sensor (87) removes the marks (1d), (89b), (90b) even when a predetermined time has passed after the pulling-out mechanism (58) has passed a position separated by a predetermined distance to the holding position side. Abnormality detection means for determining an abnormal state if not detected. 3. A packaging table for mounting packaging sheets (1), (89), (90) cut to a predetermined length and provided with an opening (2a) into which a spherical object (A) is dropped. (2) is provided, and the article to be packaged (A) is inserted into the opening (2a) from above.
When dropped, the packaging sheets (1), (89), (90) on the packaging table (2) are squeezed at the outer edge of the opening (2a), and the article to be packaged (A) becomes the packaging sheet (1). ), (8
9), a packaging device configured to be wrapped in (90), the packaging device having the configurations described in [SA] to [SO] below. [Sa] The packaging sheets (1), (8) wound in a roll shape
9) and (90) end portions (1b), (89c), (90
a pull-out mechanism (58) that reciprocates on the packaging table (2) so that it can be pulled out on the packaging table (2) while sandwiching c);
Also, the packaging sheets (1), (8) that have been pulled out.
9), a cutter (59) for cutting a predetermined position on the roll-shaped portion side of (90). [C] Marks (1) provided at predetermined intervals along the longitudinal direction of the packaging sheets (1), (89), (90)
d), (89b), (90b) and the presence of the drawer mechanism (58) for the packaging sheets (1), (89), (90).
The presence or absence of the pull-out mechanism (58) at the sandwiching position for sandwiching the ends (1b), (89c), (90c) of the optical sensor (8) is provided near the sandwiching position.
7) and a position sensor (88) for continuously detecting the position of the pull-out mechanism (58). [S] After the packing sheets (1), (89) and (90) start to be drawn out by the drawing mechanism (58),
The optical sensor (87) causes the marks (1d), (89)
b) and (90b) are detected, the pull-out mechanism (5
8) A first control means for stopping the cutter (59) and stopping the cutter (59). [C] Setting means (92) for setting the width type of the packaging sheets (1), (89), (90), and a setting signal from the setting means (92) and the position sensor (8).
According to the position signal from 8), the packaging sheets (1), (89), (90) are opened from the position where the pulling-out mechanism (58) is stopped by the first control means (1). Second control means for moving and operating the drawer mechanism (58) so as to come to a predetermined position on 2a). [SO] When the pull-out mechanism (58) is stopped by the first control means, the position sensor (87) is detected by the optical sensor (87) while detecting the marks (1d), (89b), (90b). Abnormality detecting means for judging the abnormal state if the position signal of 88) does not correspond to the setting signal from the setting means (92).