JPH09150801A - Packaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly detect a condition where a drawing mechanism is not smoothly moved by detecting the changing ratio of a detecting signal to time for outputing the position of the drawing mechanism which pinches the end part of a packaging sheet and moves. SOLUTION: When a top board 39 and a holding arm 38 pinch the end part of a packaging sheet 1 and a drawing mechanism 35 being at a drawing position is started to move to the pinching position side on the left of the paper face, a potentiomeyer 59 continuously outputs detecting signals and the changing ratios B of the signals are continuously detected. This changing ratio B is compared with a set value (e.g. 1/2 of the value of an ordinary changing ratio B) and if the changing ratio is at least the set value B1, it is judged that the drawing mechanism is normally moving toward the pinching position side. On the contrary, if the changing ratio B is smaller than the set value B1, it is judged that an abnormality such as biting of a foreign matter into somewhere in the drawing mechanism 35 occurs and movement of the drawing mechanism 35 to the pinching position side becomes dull. It is possible thereby to detect precisely the abnormal condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging device for agricultural products which wraps a packaged item (for example, vegetables such as lettuce and cabbage, or fruits such as melon and apple) with a packaging sheet.

[0002]

2. Description of the Related Art In the packaging apparatus as described above, a packaging sheet of a predetermined length is placed on a packaging table and an article to be packaged is placed on the packaging sheet, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-125716. In some cases, the packaging means is activated to automatically package the article to be packaged in the packaging sheet on the packaging table.

In this packaging apparatus, a wrapping sheet (1 in FIG. 1 of the publication) is rotatably mounted on one lateral side of a packaging table (2 in FIG. 1 of the publication). The pulling-out mechanism that is supported and waits at the pulling-out position on the opposite side of the packaging table after completion of one packaging (see FIG.
16) of the inside automatically moves to the side of the packaging sheet as shown in FIG. When the pull-out mechanism reaches the holding position shown in FIG. 3B of the publication, the pull-out mechanism is stopped, and the end of the packaging sheet is held by the pull-out mechanism.
As shown in FIG. 4 of the publication, the drawer mechanism is again moved to the original drawer position side, and the packaging sheet is pulled out to the packaging table.

As shown in FIG. 5 of the publication, when the packaging sheet is pulled out to a predetermined length, the drawer mechanism is temporarily stopped, and a cutter (12 in FIG. 5 of the publication) is used to move the packaging sheet to the roll-shaped portion side. When the predetermined position is cut and the drawing mechanism starts moving again to reach the drawing position shown in FIG. 6 of the publication, the drawing mechanism stops and the end of the packaging sheet is released. As a result, one packaging sheet cut into a predetermined length is placed on the packaging table.

[0005]

SUMMARY OF THE INVENTION In the above packaging device,
Since the drawer mechanism is configured to reciprocate along the packaging table, foreign matter such as scraps of the packaged object may be caught in the moving part of the drawer mechanism, and the drawer mechanism may not be able to smoothly reciprocate. is there. It is an object of the present invention to provide a packaging device having a packaging sheet withdrawing mechanism that reciprocates along a packaging table so that a state in which the withdrawing mechanism cannot smoothly reciprocate can be accurately detected.

[0006]

According to a feature of claim 1, the driving means 4 is based on the detection signal of the position sensor 59.
6 operates, and the pull-out mechanism 35 is operated, for example, as shown in FIG.
14 (b) is moved to the pull-out position shown in FIG. 14 (b), and the cutting mechanism 34 cuts the packaging sheet 1 into a predetermined length.

In this case, when the drive mechanism drives the drawer mechanism to move, the drawer mechanism is driven to move at a predetermined moving speed. Therefore, the rate of change of the detection signal of the position sensor with respect to time is detected, and if the rate of change is equal to or greater than the set value, it can be determined that the drawer mechanism is normally reciprocating. On the other hand, if the rate of change is smaller than the set value, it can be judged that there is an abnormality such as foreign matter getting caught somewhere in the drawer mechanism, and the reciprocating movement of the drawer mechanism is slow. Is 0, it can be determined that the drawer mechanism cannot move back and forth.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) FIG. 15 shows the whole of the packaging device, in which one side of the packaging table 2 having an opening 2a in the center thereof is provided with a pair of support rollers 33 (corresponding to a support portion) of the packaging sheet 1 wound in a roll shape. ) Is rotatably supported by the support roller 33.
And the packaging table 2 between the horizontally long cutter 55 (see FIG. 13).
A cutting mechanism 34 including (a) and (b) is arranged. A pullout mechanism 35 for the packaging sheet 1 is arranged on the opposite side of the packaging table 2.
It is configured to be reciprocally movable between the pull-out position shown in (B) and the holding position shown in FIG. Below the opening 2a of the packaging table 2, as shown in FIGS. 1 and 5, the support table 3 for the article A to be packaged, the first holding member 14 and the like are arranged.

(2) Next, the structure in the vicinity of the support base 3 arranged below the opening 2a of the packaging base 2 will be described. FIG.
As shown in FIG. 1, the pair of left and right guide rails 5 arranged below the opening 2a of the packaging table 2 is slidable in the first and second directions.
The support member 6 is attached to the second support member 17 fixed to the upper portion of the first support member 6, and the support base 3 is supported so as to be able to fall sideways around the horizontal axis P1. The support base 3 is configured by bending four sides of a flat plate having a plus shape in a plan view upward, and an elastic material 4 such as sponge or soft rubber is attached to the outer surface thereof.

A pair of upper and lower sprockets 7 are arranged beside the guide rail 5, a chain 8 is wound around both sprockets 7, and a bracket 6a of the first support member 6 is connected to the chain 8. This allows the motor (not shown)
By rotating and driving the sprocket 7 and the chain 8, the support base 3 is moved up and down.

The horizontal axis P3 at the left and right ends of the second support member 17
A pair of holding arms 18 is swingably supported around the holding arms 18, and a horizontally long sponge member 18a is provided at the upper end of the holding arms 18.
Are provided, and springs 19 for biasing the left and right holding arms 18 to swing toward the central support base 3 side are provided. As shown in FIG.
6 is provided, and an operation arm 21 that is operated to switch between the up and down posture shown in FIG. 6 and the left and right posture shown in FIG. 6 is provided, and both ends of the operation arm 21 and the lower ends of the left and right holding arms 18 are linked links 22.
Are connected by

(3) Next, the structure of a pair of plate-shaped first holding member 14 and second holding member 16, the heater 9 and the like arranged below the opening 2a of the packaging table 2 will be described. As shown in FIGS. 1, 2 and 4, a round bar-shaped first guide rail 23 and a plate-shaped second guide rail 24 are arranged below the packaging table 2 on both sides of the opening 2a. The guide plate 12 is fixed to one side. The boss portion 13a is fixed to one end of the pair of support plates 13, and the boss portion 13a is slidably fitted on the first guide rail 23 to form the support plate 1
The roller 13 b provided on the opposite side of 3 is mounted on the second guide rail 24. As a result, the pair of support plates 13 are slidably supported in the left and right directions of the paper surface of FIGS. 1 and 2, and the heater 9 is fixed to each of the pair of support plates 13.

As shown in FIGS. 1 and 2, an operating arm 28a is provided which is rotatably driven by a motor 28, and a bracket 25 fixed to the boss portion 13a of one support plate 13 and the operating arm 28a. Are connected by a linkage rod 26. The balance arm 27 is swingably supported around the vertical axis P4 of the fixed portion, and the roller 27a at one end of the balance arm 27 is inserted into the recessed portion of the bracket 25, and the other end and the other end of the balance arm 27 are supported. The link rod 29 is connected to the boss 13a of the plate 13.

As shown in FIGS. 1, 2 and 4, the plate-shaped first holding member 14 is slidably supported within the range of the elongated hole 14a by the roller 13c supported by the support plate 13, and A pair of tension springs 32 are connected across the first holding member 14. The plate-shaped second holding member 16 is fixed to the pair of support pins 14b fixed downward to the first holding member 14.

As shown in FIGS. 2 and 4, below the support plate 13 on the side opposite to the guide plate 12, a pair of holding arms 30 swinging in a direction orthogonal to the sliding direction of the support plate 13 is provided. There is. The holding arm 30 is supported on the lower side of the support plate 13 so as to be swingable around the vertical axis P2 of the fixed portion, and is provided with an oblong elongated hole 30a, which is provided on the back surface of the support plate 13. A pair of rollers 13d is inserted into the long hole 30a, and a guide plate 10 that supports the holding arm 30 so as not to face downward is installed over both rollers 13d.

With the structure described above, when the operation arm 28a is driven to rotate by 180 ° as shown in FIGS. 2 to 3, the support plate 13 on the right side of the paper is slid to the left side of the paper, and the support plate 13 is moved. Together with the first and second clamping members 1
4 and 16 are also slid to the left on the paper surface. In conjunction with this operation, the balance arm 27 swings clockwise in the drawing,
The link rod 29 is pulled rightward on the paper surface, and the support plate 13, the first and second holding members 14, 16 on the left side of the paper surface are slid rightward on the paper surface.

As described above, when the support plate 13 on the right side of the paper surface of FIG. 2 is slid to the left side of the paper surface, the support plate 1
Interlocking with the movement of the third roller 13d, the pair of holding arms 30 opened up and down in the plane of the drawing are rocked so as to approach each other. When the operation arm 28a is rotationally driven by 180 ° in this way, the upper portion 1a of the packaging sheet 1 is narrowed and sandwiched by the first and second sandwiching members 14, 16 and the sandwiching arm 30.

(4) Next, the pull-out mechanism 35 for automatically pulling out the packaging sheet 1 from the packaging sheet 1 wound in a roll for packaging will be described. Figure 13 (a) (b)
As shown in FIG. 2, a pair of support plates 36 are slidably supported by rollers 36 a along the left and right guide rails 2 b of the packaging table 2, and a single support shaft 37 is laid across the left and right support plates 36. Thus, the five operating arms 38 are independently fitted to the support shaft 37 so as to be independently swingable. A top plate 39 is erected and connected across the upper ends of the left and right support plates 36, and a spring 40 for urging each holding arm 38 toward the swinging side of the top plate 39 is provided to configure a drawer mechanism 35. There is.

The support shaft 37 is rotatably supported by the support plate 36, and the pair of arms 3 is provided on the left and right of the support shaft 37.
7a is fixed, and one rod 37b is erected and fixed across the left and right arms 37a. A fan-shaped gear 41 is swingably supported by a supporting shaft of a roller 36a of one support plate 36, and a link 42 is installed between the fan-shaped gear 41 and one arm 37a, and the fan-shaped gear 41 is rocked. A motor 43 that is driven dynamically is provided. The state shown in FIG. 13 (a) is a state in which the motor 43 is driven to push up the rod 37b to pull down each holding arm 38 from the top plate 39. As shown in FIG. When the rod 37b is pulled down by driving the holding arm 38 to the top plate 39 side by the urging force of the spring 40, the packaging sheet 1
Hold the ends of the.

As shown in FIGS. 13A and 13B, the packaging table 2
One drive shaft 44 is disposed at one end of the drive shaft 4 and
A pair of drive sprockets 45 are fixed to both ends of the drive shaft 4, and a motor 46 (corresponding to a drive unit) that rotationally drives the drive shaft 44 is provided. One driven shaft 47 is arranged at the opposite end of the packaging table 2, and driven sprockets 48 are fixed to both ends of the driven shaft 47. A pair of left and right chains 49 is wound around the left and right drive sprockets 45 and the driven sprockets 48, and the left and right chains 49 are connected to the left and right support plates 36 of the drawer mechanism 35. With the above structure, the drive sprocket 45 is rotationally driven in the forward and reverse directions by the motor 46, whereby the drawer mechanism 35 is reciprocatingly driven along the guide rail 2b of the packaging table 2.

(5) Next, the overall flow of packaging in this packaging apparatus will be described with reference to FIGS. 11 and 12. (5) -1 As shown in FIG. 15, in a state in which one piece of the packaging sheet 1 cut into a predetermined length is placed on the packaging table 2, the worker manually puts the article A to be packaged on the packaging table 2 Drop it into the opening 2a of
As shown in FIG. 5, the article A to be packaged is supported by the support base 3 while being wrapped in the packaging sheet 1 to some extent.

As shown in FIG. 15, a pair of push-button type activation switches 50 are arranged on the packaging table 2 at predetermined intervals, and as described above, the worker manually packages the article A to be packaged. After being dropped into the second opening 2a, the pair of start switches 50 are simultaneously pressed with both hands (step S).
1). As a result, as shown in FIG. 6, the pair of holding arms 18 arranged on both sides of the support base 3 are oscillated to the side of the article to be packaged A, and the holding arm 18 holds the article to be packaged A on the support table 3.
(Step S2), the lowering operation of the support base 3 is started (step S3).

As shown in FIG. 6, an optical sensor 31 composed of a light emitter and a light receiver is arranged above the first holding member 14 so that the light detected by the light emitter is directly below the opening 2a of the packaging table 2. It is set to pass through. Thereby, when the light receiver of the optical sensor 31 receives the detection light from the light emitter after the lowering operation of the support base 3 is started (step S4), the upper end of the object to be packaged A has passed the position of the detection light. Judged,
A timer (not shown) starts counting (step S
5) When the set time T1 has elapsed (step S6), the support base 3 is stopped at that position (see the position shown in FIG. 6) (step S7). A plurality of rubber plate-shaped auxiliary throttle members 11 are provided below the opening 2a so as to surround the article A to be packaged, and the auxiliary throttle member 11 serves to improve the packaging sheet 1 as the support base 3 is lowered. Squeezed.

When the support base 3 is stopped after the set time T1 has elapsed as described above, the upper end of the article A to be packaged should be positioned below the second holding member 16 as shown in FIG. Therefore, by operating the dial type adjustment switch 56 shown in FIG. 15, the set time T1 can be changed to long or short. As a result, when the set time T1 is set to be long, the stop position of the support base 3 shown in FIGS. 6 and 7 is slightly lower, and the upper end of the article A to be packaged A has the second holding member 16 and the holding arm 30. To move downwards.
Therefore, as described in (5) -2, 3 to be described later, the first and second sandwiching members 14 and 16 and the sandwiching arm 30 sandwich the upper portion 1a of the packaging sheet 1, and the packaging sheet 1 receives the packaged object A. When the package A is wrapped, the article A to be packaged is relatively loosely wrapped in the packaging sheet 1.

On the contrary, if the set time T1 is set to be short, the stop position of the support base 3 shown in FIGS. 6 and 7 will be slightly above, and the upper end of the article A to be packaged will be the second holding member 16 and the holding arm. It will approach 30. Therefore, as described in (5) -2 and 3 below, the first and second holding members 1
4, 16 and the holding arm 30 is the upper part 1 of the packaging sheet 1.
When the object A to be packaged is wrapped in the packaging sheet 1 by sandwiching a, the object A to be packaged is relatively tightly wrapped in the packaging sheet 1.

(5) -2 When the support base 3 stops at the position shown in FIG. 6 as described above, the pair of holding arms 18 are slightly opened (step S8), and the operation shown in FIGS. As shown in FIG. 3, the pair of support plates 13 are slid toward the support base 3 (step S9). In this case, in the state shown in FIG. 4, the support plate 13, the heater 9, the first and second holding members 14, 16 are provided.
Is located on the retreat side, and the tip of the first clamping member 14 is located closer to the support base 3 side than the tip of the heater 9 by the tension spring 32 and the roller 13c of the support plate 13 on the retreat side. The tip of the second holding member 16 is located closer to the support base 3 than the tip of the member 14.

In the above state, as shown in FIGS. 2 to 3,
When the support plate 13 is slid to the support base 3 side by the motor 28, first, the lower second holding member 16 and the holding arm 30 move the upper portion 1 of the packaging sheet 1 as shown in FIG.
a. The first and second holding members 14 and 16 are connected to each other by the support pin 14b, and the tip of the first holding member 14 is retracted from the tip of the second holding member 16, so that the second holding member 16 on the lower side is retracted. When the upper part 1a of the packaging sheet 1 is sandwiched and stopped, as shown in FIG. 7, the upper first clamping member 14 is slightly separated from the upper part 1a of the packaging sheet 1 and the upper part 1a is lightly sandwiched. Becomes Thereby, the article A to be packaged is wrapped in the packaging sheet 1.

Next, when the support plate 13 is further slid toward the support base 3 from the state shown in FIG. 7, the tension spring 32 is extended as shown in FIG. 8, and the first and second springs are extended.
While the holding members 14 and 16 are strongly pushed toward the holding side of the upper portion 1a of the packaging sheet 1, the heater 9 fixed to the support plate 13 causes the first and second holding members 14 and 16 to move.
The upper portion 1a of the packaging sheet 1 is sandwiched between them.

When the upper portion 1a of the packaging sheet 1 is sandwiched by the first and second clamping members 14 and 16 and the clamping arm 30, the packaging sheet 1 is entirely pulled up as shown in FIG. The object to be packaged A itself is also pulled up together with the packaging sheet 1 and floats up.
As a result, the object A to be packaged is tightened, and the wrinkles of the packaging sheet 1 are extended as a whole, so that a clean packaging can be expected. In this case, the holding arm 18 is slightly opened as described above (step S8), and the sponge member 18a of the holding arm 18 is separated from the object A to be packaged and the packaging sheet 1, and the first and second holding members 14 are moved. , 16 and the sandwiching arm 30 are advanced to the sandwiching side, the sponge member 18a of the holding arm 18 and the sponge member 18a of the holding arm 18 do not interfere with the pulling up of the packaging sheet 1 and the article A to be packaged. Since the article A does not rub against the article A, the article A to be packaged is not damaged.

(5) -3 As shown in FIG. 8, when the article A to be packaged is lifted from the support base 3 as the upper portion 1a of the packaging sheet 1 is sandwiched,
The support base 3 is slightly lifted and the packaged object A is moved to the second position.
The back surfaces of the holding member 16 and the holding arm 30 are lightly pressed (step S10). Next, the upper portion 1a of the packaging sheet 1 is heated by the heater 9 and the upper portion 1a is welded, and the upper portion 1a of the packaging sheet 1 is welded.
It becomes easy to separate a (step S11).

When the heating by the heater 9 is completed in the state shown in FIG. 8, the support plate 13 and the heater 9 are slightly separated from the upper portion 1a of the packaging sheet 1 and are stopped as shown in FIG. 9 (step S12). . in this case,
The tension spring 32 that has been stretched in the state of FIG. 8 only returns to the original state shown in FIG. 9, and the upper portion 1a of the packaging sheet 1 is sandwiched by the first and second clamping members 14 and 16. Is maintained.

In this way, the first and second holding members 14, 1
The state in which the heater 9 is slightly separated from the upper portion 1a of the packaging sheet 1 while the upper portion 1a of the packaging sheet 1 is sandwiched by 6 is maintained for the set time T2 (step S12), During the set time T2, the portion heated by the heater 9 in the upper portion 1a of the packaging sheet 1 is cooled and the welding becomes sufficient.

In the state shown in FIG. 9 above, the drawer mechanism 35 stopped at the drawer position shown in FIG. 15 moves to the left side of the drawing and reaches the holding position shown in FIG.
The top portion 39 and the holding arm 38 of the drawer mechanism 35 clamp the end portion of the packaging sheet 1 (step S1).
7). In this case, as shown in FIGS. 13A and 13B, the support shaft 51 is laid across the lower portions of the left and right support plates 36 of the drawer mechanism 35, and the removal plate 52 is fixed to the center of the support shaft 51. .

As a result, as shown in FIG. 9, the upper portion 1a of the packaging sheet 1 is sandwiched by the first and second clamping members 14 and 16, and the heater 9 is slightly separated from the upper portion 1a of the packaging sheet 1 and operated. When the drawer mechanism 35 moves to the holding position side during the set time T2 that is stopped at, the removal plate 52 of the drawer mechanism 35 moves along the upper surface of the first holding member 14, and the removal plate 52 causes the packaging sheet to move. The upper portion 1a of 1 is removed from the article A to be packaged and is conveyed to the cutting mechanism 34 side. In this case, since the upper and lower portions of the welded portion of the packaging sheet 1 are sandwiched and held by the first and second clamping members 14 and 16, as described above, the packaging sheet 1
Even if the upper part 1a of the is removed, the welded part is not broken.

When the set time T2 in step S12 has elapsed, as shown in FIG. 10, the support plate 13, the heater 9, and the first and second holding members 14, 16 are slid to the retreat side (step S13). Next, the holding arm 18
Is operated to the left and right to the original position (step S1
4) Then, the support base 3 is further lowered and laid down, and the article A to be packaged is discharged to the slide base 15 (see FIG. 15) and collected (step S15). As described above, the packaging of one article to be packaged A is completed, after which the support base 3 is again lifted to the original position shown in FIG. 5 and stopped (step S16). Equivalent).

(5) -4 While the object A to be packaged is being packaged in the above steps S12 to S16, the drawer mechanism 35 is shown in FIG. 13A from the drawer position shown in FIG. 15 as described above. Move to the clamping position (during this time, the upper part 1a of the packaging sheet 1
13), the ends of the roll-shaped packaging sheet 1 are nipped (step S17), and the pull-out mechanism 35 starts moving to the right side of the drawing again as shown in FIG. The operation is started (step S18).

When the drawer mechanism 35 reaches the holding position and holds the end portion of the roll-shaped packaging sheet 1, the lower end of the upper portion 1a of the packaging sheet 1 on the removal plate 52 of the drawer mechanism 35 is the first Since the pulling mechanism 35 moves from the holding position to the right side of the paper as shown in FIG. 13B, the removal plate 52 of the pulling mechanism 35 is pulled away from the upper portion 1a of the packaging sheet 1 because the pulling mechanism 35 is caught on the end of the holding member 14. Then, the upper portion 1a of the packaging sheet 1 falls downward from the end of the first holding member 14.

Marks 1b are printed on the wrapping sheet 1 at predetermined intervals, and as described above, the drawing mechanism 35 is used.
When the packaging sheet 1 is pulled out by a predetermined length by, the mark 1b printed on the packaging sheet 1 is also pulled out,
As shown in FIG. 3B, the mark 1b is formed by the optical sensor 53.
Is detected and the drawer mechanism 35 is temporarily stopped (step S19). Next, with the drawing mechanism 35 temporarily stopped, the cutter 55 of the cutting mechanism 34 is operated to descend as shown in FIG. 14A, and the packaging sheet 1 is cut into a predetermined length (step S20). The packaging sheet 1 is transparent, and normally, the detection light from the light emitting device of the optical sensor 53 passes through the packaging sheet 1 and is reflected by the reflection plate 57 of the packaging table 2,
The light is received by the light receiver of the optical sensor 53. The mark 1b is detected by blocking the detection light by the mark 1b, and the mark 1b is detected.
As shown in (b), a cover 58 that covers the optical sensor 53 is provided to prevent erroneous detection of the mark 1b.

When the packaging sheet 1 is cut to a predetermined length as described above, the pull-out mechanism 35 again starts moving rightward on the paper surface, and the packaging sheet 1 cut to a predetermined length is moved rightward on the paper surface. As shown in FIG. 14B, when the center of the packaging sheet 1 cut into a predetermined length reaches the opening 2a of the packaging table 2, the drawer mechanism 35 stops at this drawer position and the drawer is pulled out. The end of the packaging sheet 1 is separated from the top plate 39 and the holding arm 38 of the mechanism 35 (step S21). As a result, one packaging sheet 1 cut into a predetermined length is placed on the packaging table 2.

(6) Next, the drawing mechanism 35 is shown in FIG.
Detection of the position of the pull-out mechanism 35 and detection of abnormality when moving from the pull-out position shown in (B) to the sandwiching position shown in FIG. 13 (A) will be described based on FIG. 16. As shown in FIGS. 13A and 13B, the drawer mechanism 3
A rotary potentiometer 59 (corresponding to a position sensor) is provided at one end of the drive shaft 44 for No. 5, and the potentiometer 59 has a rotation angle of 0 as shown by one waveform in FIG. ° (value of detection signal V0)
Therefore, the detection signal corresponding to 360 ° (the detection signal value V3) is repeatedly and continuously output.

As a result, step S17 shown in FIG.
In FIG. 14B, when the drawer mechanism 35 located at the drawer position starts moving to the holding position side on the left side of the paper (step S31), the potentiometer 59 holds the paper on the left side of the drawing position from the draw position. Since the detection signal that goes toward the position is continuously output, the change rate B of the detection signal of the potentiometer 59 is continuously detected (step S34). At the beginning when the drawer mechanism 35 starts to move from the drawer position, it takes some time until the moving speed of the drawer mechanism 35 reaches the predetermined speed, so during the set time T3 after the drawer mechanism 35 starts to move from the drawer position, The change rate B is not detected (steps S32 and S33).

When the change rate B of the detection signal of the potentiometer 59 is detected as described above (step S3)
4) The rate of change B is compared with a set value B1 (for example, 1/2 of the value of the normal rate of change B), and if the rate of change B is equal to or greater than the set value B1, the drawer mechanism 35 moves from the pulled-out position to the holding position. It is judged to have moved normally to the side. Conversely, the rate of change B
Is smaller than the set value B1 (step S36), an abnormality such as a foreign substance being caught somewhere in the drawer mechanism 35 occurs, and the movement of the drawer mechanism 35 from the drawer position to the holding position is slow. If the rate of change B is "0", it is determined that the drawer mechanism 35 cannot move to the holding position (corresponding to abnormality detecting means). In such a state, the drawer mechanism 35 stops at that position and the packaging operation also stops (step S40), and the drawer mechanism 35 slightly moves to the opposite drawer position side and stops again (step S41). A buzzer (not shown) operates (step S42).

As shown in FIG. 18, when the detection signal has the value V0, the potentiometer 58 is provided with the characteristic that the value V0 is output only during a predetermined period (during a predetermined rotation angle of the potentiometer 59). Accordingly, when the detection signal has the value V0 (step S35), the change rate B is not detected and it is detected whether the value V0 changes over the set time T4 or more (steps S43 and S4).
4, S45). In this case, if the detection signal changes from the value V0 before the set time T4 elapses, the pullout mechanism 35
Is normally moved from the pull-out position to the holding position. On the contrary, if the detection signal does not change from the value V0 even after the set time T4 (for example, about twice the normal time required for the potentiometer 59 to rotate by a predetermined rotation angle) has passed, the abnormality is the same as described above. Then, the process proceeds to step S40.

When the pull-out mechanism 35 moves to the holding position side, the light detected by the optical sensor 53 is shut off as shown in FIGS. 13A and 18 (step S37), and the pull-out mechanism 35 moves to the holding position side. When moving, the detection signal is the value V
When it becomes 1 (step S38), the drawer mechanism 35 is stopped, and this position is set to be the holding position of the drawer mechanism 35 shown in FIG. 13A (step S39). Even while this detection signal reaches the value V1, the change rate B is detected and the abnormality is detected by comparison with the set value B1 as described above.

(7) Next, the drawing mechanism 35 is shown in FIG.
Detection of the position of the drawer mechanism 35 and detection of abnormality when moving from the holding position shown in (a) to the drawer position shown in FIG. 14 (b) will be described with reference to FIG. At the holding position, the pull-out mechanism 35 has the packaging sheet 1
When the end portion of the above is clamped and starts to move to the pull-out position side as shown in FIG. 13B, (step S47), the above (6)
Contrary to the above, the potentiometer 59 continuously outputs a detection signal for moving from the holding position shown in FIG.
The change rate B of the detection signal of is continuously detected (step S50). In this case, the change rate B is not detected during the set time T3 after the pull-out mechanism 35 starts moving from the holding position, as in the case of (6) above (step S48,
S49).

When the rate of change B of the detection signal of the potentiometer 59 is detected as described above (step S50), the rate of change B is set to the set value B1 (for example, the value of the normal rate of change B is the same as in (6)). 1/2) and the rate of change B is equal to or greater than the set value B1, it is determined that the drawer mechanism 35 is normally moving from the holding position to the drawer position side. Conversely, if the rate of change B is smaller than the set value B1 (step S5
2) It is judged that an abnormality such as a foreign substance being caught somewhere in the pull-out mechanism 35 occurs and the movement of the pull-out mechanism 35 from the holding position to the pull-out position is slowed down. If B is "0", it is determined that the drawer mechanism 35 cannot move to the drawer position side (corresponding to abnormality detecting means). In such a state, the drawer mechanism 35 stops at that position and the packaging operation also stops (step S58), and the drawer mechanism 35 slightly moves to the opposite holding position side and stops again (step S5).
9), a buzzer (not shown) operates (step S6)
0).

When the detection signal has the value V0 as shown in FIG. 18, it is detected whether the value V0 changes over the set time T4 as in the case of (6) above (step S).
1, S61, S62, S63). In this case, if the detection signal changes from the value V0 before the set time T4 elapses,
It is determined that the drawer mechanism 35 is normally moving from the holding position to the drawer position side. On the contrary, if the detection signal does not change from the value V0 even after the set time T4 has passed, it is determined to be abnormal as described above and the process proceeds to step S58.

In this way, when the pull-out mechanism 35 starts to move from the holding position and the detection signal is continuously output from the potentiometer 59, the detection signal reaches the maximum value V3 from the value V0 as shown in FIG. And returns to the value V0 (one rotation of the drive shaft 44 (see FIG. 13A)) (step S53), the number N of detection signal outputs is incremented by one (step S54).

As the drawing mechanism 35 moves to the drawing position side as described above, while the number of output times N is being incremented by one, the mark of the packaging sheet 1 as shown in FIG. 1b is detected by the optical sensor 53, the pull-out mechanism 35 stops, and the cutting mechanism 3
4 (the cutter 55) cuts the packaging sheet 1 into a predetermined length (steps S19 and S20 in FIG. 12). When the cutting of the wrapping sheet 1 is completed, the drawer mechanism 35 starts moving again to the pulling-out position side while holding the wrapping sheet 1 cut into a predetermined length, and the counting of the output number N is restarted. Also in this case, the process proceeds from step S46 to step S47, and the change rate B is not detected during the set time T3 after the drawer mechanism 35 starts moving (steps S48 and S49).

After this, as shown in FIG. 18, the number of times N of output of the detection signal reaches the set number of times N '(step S55),
Further, the drawer mechanism 35 moves to the drawer position side,
When the detection signal reaches the value V2 (step S56), the pull-out mechanism 35 stops, and this position is shown in FIG.
The pull-out mechanism 35 is set to the pull-out position shown in (b) (step S57). Even while this detection signal reaches the value V2, the rate of change B is the same as described above.
Is detected and an abnormality is detected by comparison with the set value B1.

(8) As shown in FIG. 15, an emergency stop switch 54 (push-on / push-off type built-in lamp) is provided at the end of the packaging table 2. By pressing the stop switch 54 during the packaging operation, the packaging operation can be stopped urgently, and if the drawer mechanism 35 is moving to the drawer position side (or the sandwiching position side), the drawer mechanism 35 is also moved. Stop and move in the opposite direction (side of clamping position or side of pulling out position) and stop. Then, a buzzer (not shown) operates only during the set time, and the lamp of the stop switch 54 lights up.

When the stop switch 54 is pushed off, the lamp of the stop switch 54 is turned off, so that each part of the packaging device is in the initial state (the drawer mechanism 35 is located at the drawer position shown in FIG. If the 1 holding member 14 and the like are in the positions shown in FIGS. 2 and 5, another green lamp (not shown) is turned on and the packaging can be resumed as it is. On the contrary, if it is not in the above-mentioned initial state, the green lamp blinks. In this case, if the pair of start-up switches 50 are simultaneously pressed, the respective parts of the packaging device are automatically returned to the above-mentioned initial state, and the green lamp is turned on to resume the packaging.

Even when the power switch (not shown) of the packaging device is turned on and operated, such as at the start of a day's packaging work, the packaging is performed in the same manner as when the stop switch 54 is pushed off. It is determined whether each part of the device is in the initial state. Thereby, if each part of the packaging device is in the initial state, the green lamp is turned on and the packaging can be started as it is. Conversely, since the green lamp blinks if it is not in the initial state, a pair of start switches 50 is used as described above.
If both are pressed at the same time, each part of the packaging device automatically returns to the above-mentioned initial state, and the green lamp is turned on to start the packaging.

As shown in FIG. 15, a cutting switch 60 capable of arbitrarily operating the cutting mechanism 34 is provided at the end of the packaging table 2. As a result, when the cutting switch 60 and one of the pair of starting switches 50 are simultaneously pressed, the cutting mechanism 34 operates and the packaging sheet 1 can be cut arbitrarily.

[Another Embodiment of the Invention] In the above-mentioned [Embodiment of the Invention], the optical sensor 53 is eliminated, and FIG.
You may make it use the packaging sheet 1 which has not printed the mark 1b as shown in (a). In this case, a limit switch (not shown) for detecting that the drawer mechanism 35 has reached the sandwiching position shown in FIG. 13A is provided, and the drawer mechanism 35 is stopped at the sandwiching position by the detection of this limit switch. Let

Next, when the pulling mechanism 35 is moved from the holding position to the pulling position side, as shown in FIG. 18, the value V of the detection signal of the potentiometer 59 at the start of movement is shown.
The movement distance of the drawer mechanism 35 from the holding position depends on the difference from 1 to the value V3, the number of times N the value V0 to the value V3 is output during movement, and the difference between the value of the detection signal at the current position and the value V0. To detect. As a result, the drawer mechanism 35 moves from the holding position to the drawer position side, and
When the position shown in (a) is reached, the drawer mechanism 35 is temporarily stopped, the cutting mechanism 34 cuts the packaging sheet 1, and the drawer mechanism 35 is moved again to the drawer position side, as shown in FIG. When the drawer position shown is reached, the drawer mechanism 35 is stopped.

In the above-mentioned [Embodiment of the Invention], FIG.
As shown in FIG. 10, the packaging sheet 1 is configured to be fastened by welding by heating with the heater 9. However, instead of the heater 9, an adhesive tape (not shown) is attached, so that the packaging sheet 1 is attached. It may be configured to be fastened.

[0058]

According to the first aspect of the present invention, in a packaging apparatus having a packaging sheet withdrawing mechanism which is driven to reciprocate along a packaging table, an abnormal state in which the withdrawing mechanism cannot smoothly reciprocate is accurately detected. As a result, it is possible to prevent the failure of the drawer mechanism and the like caused by leaving this abnormal state. In this case, by utilizing the detection signal of the position sensor which is an existing device for moving the pullout mechanism to the holding position and the pullout position, this position sensor can be used also for detecting an abnormal state of the pullout mechanism. Therefore, it is not necessary to separately provide a dedicated sensor for detecting an abnormal state of the drawing mechanism, which is advantageous in terms of simplification of the structure and cost reduction.

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

[Brief description of the drawings]

FIG. 1 is a perspective view showing a moving drive structure of first and second holding members, a heater, and the like.

FIG. 2 is a plan view showing a moving drive structure of first and second holding members, a holding arm, and a heater.

FIG. 3 is a plan view showing a state in which the first and second clamping members and the like are moved to a clamping position from the state shown in FIG.

FIG. 4 is a vertical cross-sectional side view showing a moving drive structure of first and second holding members, a holding arm, and a heater.

FIG. 5 is a front view of the vicinity of the support table showing a state in which an object to be packaged is pushed into an opening of the packaging table and dropped on the support table.

FIG. 6 is a front view showing a state in which a pair of holding arms are closed from the state shown in FIG. 5 and the support base is lowered to the lower side of the first and second holding members.

FIG. 7 is a front view showing a state in which the first and second sandwiching members sandwich the upper portion of the packaging sheet when the first and second sandwiching members and the heater are moved to the sandwiching side.

8 is a front view showing a state where the heater sandwiches the upper portion of the packaging sheet from the state shown in FIG.

9 is a front view showing a state in which the upper portion of the packaging sheet is removed by the removal plate of the drawer mechanism after the state shown in FIG.

FIG. 10 is a front view showing a state in which the first and second holding members and the heater are moved to the retreat side after the state shown in FIG. 9;

FIG. 11 is a diagram showing the flow of the first half of the entire packaging.

FIG. 12 is a diagram showing the flow of the latter half of the entire packaging.

FIG. 13 is a side view showing a mechanism for pulling out a packaging sheet and the vicinity of a packaging table, showing a state in which the pulling-out mechanism reaches a holding position and starts moving from the holding position to the pulling-out position side.

FIG. 14 is a side view showing a state in which the drawing mechanism is temporarily stopped from the state shown in FIG. 13 and the packaging sheet is cut by the cutting mechanism, and thereafter the drawing mechanism reaches the drawing position.

FIG. 15 is a perspective view showing the entire packaging device.

FIG. 16 is a diagram showing the flow of abnormality detection when the drawer mechanism moves from the drawer position to the holding position.

FIG. 17 is a diagram showing a flow of detection of a pull-out position and detection of abnormality when the pull-out mechanism moves from the holding position to the pull-out position.

FIG. 18 is a diagram showing the state of the detection signal of the potentiometer of the pullout mechanism between the holding position and the pullout position.

[Explanation of symbols]

 1 Packaging Sheet 2 Packaging Platform 33 Supporting Part 34 Cutting Mechanism 35 Drawing Mechanism 46 Driving Means 59 Position Sensor A Packaged Object B Change Rate B1 Set Value

Claims (1)

[Claims] 1. A packaging table (2) for placing a packaging sheet (1), and an object to be packaged (A) placed on the packaging sheet (1) of the packaging table (2), the packaging sheet (1). ) Wrapping means for wrapping the wrapping device in a wrapping means, and a supporting portion for supporting the wrapping sheet (1) wound in a roll shape on the lateral side portion of the wrapping table (2) so as to be rotatable around the roll axis. (33), a drawer mechanism (35) capable of holding the end portion of the packaging sheet (1) and driven to move along the packaging base (2), and detecting the positions of the drawer mechanism (35). Position sensor (59) that continuously outputs detection signals
And a clamping position for clamping the end of the roll-shaped packaging sheet (1) supported by the support section (33) based on the detection signal of the position sensor (59), and the packaging sheet ( Drive means (46) for moving and driving the pulling-out mechanism (35) over the pulling-out position for pulling out the sandwiched packaging sheet (1) to the packaging table (2) while rotating the roll-shaped portion of 1), The wrapping sheet (1) by the drawer mechanism (35)
And a cutting mechanism (34) that automatically cuts a predetermined position on the roll-shaped portion side of the packaging sheet (1) when pulled out to a predetermined length, and the time of the detection signal of the position sensor (59). When the rate of change (B) with respect to is smaller than the set value (B1), the packaging device is provided with abnormality detecting means for determining an abnormality.