JPS636407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a sewing machine that attaches tape to a predetermined length on the sewn part after sewing the opening of the bag. The present invention relates to a bag tape attachment defect detection device that generates a defect signal when a defective phenomenon occurs due to a large deviation in attachment.

Prior Art After a bag is transported by a transport means such as a conveyor, and the opening of the bag is sewn by a sewing means provided along the transport direction of the transport means, a tape supply means provided in the next step of the sewing means is used to seal the bag. Japanese Patent Publication No. 47-34363 discloses a sewing machine that supplies tape to the sewing section and automatically attaches the tape to the sewing section at a predetermined length using a tape attaching means provided in the next process of the tape supply means. It is being

However, in this case, as shown in FIG. 1a, the tape T attached to the sewn part 1b of the upper end 1a of the bag 1 has protrusions 2 that are approximately equal to the left and right from both edges of the bag 1, as shown in FIG. 1a. Or, as shown in Fig. 1b, the protrusion 2 of the tape T is slightly shifted from the front edge of the bag 1 in the normal state, but there is some kind of timing difference, tape feeding error, etc. For some reason, as shown in FIGS. 1c to 1f, if the protruding part 2 of the tape T attached to the bag 1 is provided with a large deviation from the front edge or the rear edge of the bag 1, the bag 1 will be removed immediately. Since it was not possible to detect poor attachment of the tape T to the tape, defective products were mixed in with normal products, requiring time and labor for re-inspection.

In addition, an automatic crepe tape cutting device was developed in 1983, which has a bag detection means for detecting the presence or absence of a bag with crepe tape straddled over the edge and sewn by a machine.
It is proposed as Publication No. 33729.

However, in this case, when the bag detecting means detects a bag sewn with crepe tape continuously straddled over the opening of the bag, a proximity switch connected in series to the bag detecting means closes and the crepe tape is sewn into the bag. The bag is cut at a predetermined distance that protrudes from the side edge, and the bag detection limit switch closes when no bag is fed, and the timing limit switch connected in series to the bag detection limit switch remains constant regardless of the presence or absence of a bag. The crepe tape is closed at intervals, and the proximity switch is closed to cut the crepe tape, but it is not possible to detect poor attachment due to misalignment of the crepe tape attached to the opening of the bag.

Problems to be Solved by the Invention The present invention has been made in view of the above circumstances.
If, for some reason, the protrusion of the tape attached to the sewn part of the upper end of the bag at a predetermined length deviates significantly from the front or rear edges of both edges of the bag,
Immediately detects a tape attachment failure and generates a defect signal, which can be used to activate a pilot lamp, alarm buzzer, or removal device such as a bag with a tape attachment defect, or to stop the entire device. To provide a bag tape attachment defect detection device capable of preventing defective bags from being mixed with bags to which tape is normally attached, and saving time and labor such as re-inspection.

Means for Solving the Problems The bag tape attachment defect detection device of the present invention includes a sewing means, a tape supply means, and a tape attaching means which are sequentially arranged along the transport direction of the transport means, and the tape A third detection device and a first detection device are respectively arranged in that order along the transfer direction of the transfer device in the next step of the attachment device, and a second detection device is arranged below between the third detection device and the first detection device. Place the device and the first
The detection device is connected to the first AND through the first NOT circuit.
a circuit and said second sensing device to a first sensing device.
and connects the second detection device to the AND circuit of the second detection device.
The third detection device is connected to the second AND circuit via the NOT circuit and the differentiation circuit, and the third detection device is connected to the third AND circuit.
It has a configuration characterized in that it is connected to the second AND circuit via a NOT circuit, and the output sides of the first AND circuit and the second AND circuit are connected to a signal generator.

Operation: The sewing means provided along the transport direction of the transport means sews the opening of the bag, and the tape supply means provided in the next step of the sewing means supplies tape to the sewn part of the bag.
The tape attaching means provided in the next step of the tape supplying means attaches the tape to the sewing part of the bag at a predetermined length, and the tape attaching means attaches the tape to the sewing part of the bag at a predetermined length, and the tape attaching means installs the tape in the next step of the tape attaching means in that order along the transport direction of the moving means. The third detection device and the first detection device arranged detect the protrusion of the tape attached to the bag, and the second detection device arranged below between the third detection device and the first detection device detects the protrusion of the tape attached to the bag. Detect.

Then, when the third detection device, the first detection device, and the second detection device operate in this order, and then return to the non-operation state in the order of the second detection device, the third detection device, and the first detection device, the first detection device operates. A first device in communication with the device via the first NOT circuit and a second detection device in communication with the device via the first NOT circuit.
The AND circuit and the second detection device are connected through the second NOT circuit and the differentiation circuit, and the third detection device is connected to the second AND circuit through the third NOT circuit, and the second detection device is connected to the second AND circuit through the third NOT circuit. AND circuit or second AND
A faulty signal is generated by either side of the circuit.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a schematic front view showing the overall arrangement of a bag opening sewing machine equipped with a bag tape attachment defect detection device according to an embodiment of the present invention, and 3 is a transfer conveyor serving as a transfer means; The bag 1 to be sewn, which has been filled with contents by a roll or the like, is conveyed in the direction of arrow A by the transfer conveyor 3 in an upright state with its open upper end 1a facing upward.

Then, the sewing machine part 4 serving as a sewing means for sewing the open upper end part 1a of the bag 1 along the transport direction of the transport conveyor 3 and the tape T attached to the sewing part 1b of the bag 1 are pulled out from the roll 5. A tape attachment means including a tape drawer serving as a tape supply means, a heat seal drive device 6, and a cutter 5f (see FIG. 3) is sequentially arranged, and the next step of the tape attachment means is to remove a bag. 1 and a third detection device 10 consisting of a photoelectric switch for detecting the passage of the leading edge and trailing edge of the tape T attached to the tape T; A first detection device 8 consisting of a photoelectric switch for detecting the bag 1 is arranged in that order along the transfer direction of the transfer conveyor 3. A second detection device 9 consisting of a photoelectric switch is arranged for detecting the passage of the edge.

Reference numeral 7 denotes a bag guide through which the upper end 1a of the bag 1 to which the tape T is attached passes, and a third detection device 10 and a first detection device 8 are attached to the bag guide 7, respectively.

Moreover, the first detection device 8 and the third detection device 10 are
The first detection device 8 is disposed at a position approximately equal to the amount of the tape T protruding from the front edge of the bag 1 with respect to the second detection device 9 provided below in the traveling direction of the bag 1. 3 detection device 10 is disposed at a position slightly shorter than the amount of tape T protruding from the rear edge of bag 1.

As shown in FIG. 3, the tape drawer section has drawer rolls 5a and 5b rotatably arranged to draw out the tape T.
At the front in the drawer direction is a tape guide 5 that guides the tape T between the drawer rolls 5a and 5b to fold it in half.
c, the drawer roll 5b is supported by the solenoid mechanism 5e via the arm 5d, and the drawer roll 5b is supported by the arm 5d by the solenoid mechanism 5e.
It is made to be able to freely approach and separate from the drawer roll 5a via the puller rolls 5a and 5b, and the tape T is pulled out from the roll 5 by the drawer rolls 5a and 5b, or the drawing of the tape T from the roll 5 is stopped.

In addition, the tape T attached by the heat seal driving device 6 is coated on the front side of the tape of the drawer rolls 5a and 5b so as to straddle the upper end 1a of the sewn bag 1, and is attached to a predetermined length. A cutter 5f for cutting is provided.

FIG. 4 shows the overall electrical wiring of the present invention.

The first detection device 8 such as a photoelectric switch is a NOT element that serves as a photoelectric amplifier AMP ₁ and a first NOT circuit.
A transistor that becomes the first AND circuit via N ₁
At the same time, the second detection device ₉ is connected to the transistor AND element A ₁ via the photoelectric AMP ₂ , and the transistor AND element A ₁ provides power via the memory element M ₁ which serves as a memory circuit. element
_P1 , and the power element _P1 is connected to a power relay _PR1 which serves as a signal generator for operating a pilot lamp, an alarm buzzer, etc.

Furthermore, the photoelectric amplifier AMP ₂ is connected to the memory element M ₁ and the transistor AND element A 2 which becomes the second AND circuit via the NOT element N ₂ which becomes the second NOT circuit and the differential element AD ₁ which becomes the differentiating _circuit . At the same time, the third detection device 10 is connected to the photoelectric amplifier AMP ₃
The transistor AND element A 2 is connected to the transistor AND element A ₂ via the NOT element N ₃ serving as a third NOT circuit, and the transistor AND element A ₂ is connected to the power element P ₁ via the one-shot pulse generator 11 .

When the first detection device 8, second detection device 9, and third detection device 10, such as photoelectric switches, receive light, their resistance decreases, and the output is "0" in the state of receiving light, and the output is "0" due to light shielding. It is designed to output a “1” signal.

Next, the operation of this embodiment will be explained.

The transfer conveyor 3 transfers the bag 1 to be sewn, which has been weighed and filled with contents, in the direction of arrow A in FIG. Next, the tape T folded in half is automatically pulled out from the roll 5 by the tape guide 5c by the cooperation of the pull-out rolls 5a and 5b, and the sewn part of the sewn bag 1 is transported by the transport conveyor 6. 1b, and then feed the tape T to the sewn part 1b of the bag 1 using the heat seal driving device 6.
After the tape T attached to the bag 1 is attached, the cutter 5f cuts the tape T attached to the bag 1 to a predetermined length, and then the bag with the tape T of a predetermined length attached to the sewing part 1b is transferred by the transfer conveyor 3. 1 to the bag guide 7.

At this time, as shown in FIG. 1a, the tape T attached to the sewn part 1b of the upper end 1a of the bag 1 has protrusions 2 that are approximately equal on the left and right from both edges of the bag 1, and is in a normal state. When the tape attachment part of the bag 1 to which the tape T is attached is introduced into the bag guide 7, as shown in FIG. blocks the light of the third detection device 10 attached to the bag guide 7, and then the tip of the protrusion 2 of the tape T blocks the light of the third detection device 10 attached to the bag guide 7.
The light of the bag 1 is blocked slightly earlier than the second detection device 9 disposed below between the third detection device 10 and the first detection device 8, and finally the front edge of the bag 1 blocks the light of the second detection device 9. . Thereafter, as shown in FIG. 6, when the tape attachment part of the bag 1 is ejected from the bag guide 7, the trailing edge of the bag 1 first passes so that the second detection device 9 is slightly smaller than the third detection device 10. The third detection device 10 receives light as the rear end of the protrusion 2 of the tape T that protrudes from the rear edge of the bag 1 passes, and finally the third detection device 10 receives the light as the rear end of the protrusion 2 of the tape T protrudes from the rear edge of the bag 1. The first detection device 8 receives the light as it passes.

For this reason, the first detection device 8, the second detection device 9,
The third detection device 10 is located at S ₁ , S ₂ , and S 2 in FIG. 7, respectively.
Output signals are output like S ₃ , and these output signals are sent to the respective photoelectric amplifiers AMP ₁ , AMP ₂ , AMP ₃
When the signals are sent to _the respective NOT elements _{N 1} , _{N 2 , N 3} via , n ₃ , and when the output signal n ₁ of the NOT element N ₁ and the output signal S ₂ of the second detection device 9 are sent to the transistor AND element A ₁ , the output signal of the transistor AND element A ₁ becomes a in FIG. ₁ , and the output signal of the memory element M ₁ becomes "0", as shown in F ₀ in FIG. 7. Therefore, the output signal of the power element P ₁ becomes "0", and the NOT element Pulse output Ps obtained by converting the output signal n ₂ of N ₂ by differential element AD ₁ and NOT element
When the output signal n ₃ of N ₃ is sent to the transistor AND element A ₂ , the output signal of the transistor AND element A ₂ becomes "0" as shown in a ₂ in Fig. 7, so the output of the power element P ₁ The signal becomes “0” and power relay PR ₁ is not activated, therefore power relay
Since no output signal is generated by PR ₁ , the pilot lamp, alarm buzzer, etc. will not operate.

Further, as shown in FIG. 1b, the protruding part 2 of the tape T is provided slightly shifted from the front edge of the bag 1, and the amount of the protruding part 2 protruding from the front edge of the bag 1 is slightly increased. The amount of the protruding part 2 protruding from the rear edge of the bag 1 is slightly shortened, and the tape attachment part of the bag 1 with the tape T attached to the sewing part 1b at a predetermined length is introduced into the bag guide 7. Then, the tip of the protrusion 2 of the tape T that protrudes from the front edge of the bag 1 first becomes the third
The light of the detection device 10 is blocked, then the tip of the tape T blocks the light of the first detection device 8, and finally the leading edge of the bag 1 blocks the light of the second detection device 9; When the tape attachment part of the bag 1 is discharged from the bag guide 7, the second detection device 9 first receives light as the trailing edge of the bag 1 passes, and then the protruding part of the tape T that protrudes from the trailing edge of the bag 1. The third detection device 10 receives light as the rear end of the tape T passes through, and finally the first detection device 8 receives light as the rear end of the protrusion 2 of the tape T passes through.

For this reason, the first detection device 8, the second detection device 9,
The third detection device 10 is S 1 ′, S ₁ ′ in FIG.
Output signals such as S ₂ ′ and S ₃ ′ are output, and these output signals are sent to the respective photoelectric amplifiers AMP ₁ , AMP ₂ ,
Each NOT element N ₁ , N ₂ , through AMP ₃
When the signal is sent to N ₃ , the input signal and output signal are reversed by each NOT element N ₁ , N ₂ , N ₃ and become n ₁ ′,
n ₂ ′, n ₃ ′, and the output signal n ₁ ′ of the NOT element N ₁ and the output signal S ₂ ′ of the second detection device 9 are connected to the transistor AND
When sent to element A ₁ , the transistor AND element A ₁
The output signal of becomes “0” as shown in Fig. 8, a ₁ ′.
Since the output signal of the memory element M ₁ becomes "0" as F ₀ in FIG. 8, the output signal of the power element P ₁ becomes "0", and the output signal n ₂ of the NOT element N ₂ becomes "0".
The pulse output Ps′ converted by the differential element AD ₁ is
The output signal n ₃ ′ of NOT element N ₃ is a transistor
When sent to AND element A ₂ , transistor AND
The output signal of element A ₂ is “0” as shown in Figure 8, a ₂ ′.
Therefore, the output signal of power element P ₁ is “0”
Therefore, power relay PR ₁ does not operate, and therefore, since no output signal is generated by power relay PR ₁ , the pilot lamp, alarm buzzer, etc. do not operate.

However, as shown in Figures 1c and 1d,
The tape T attached to the sewn part 1b of the bag 1 at a predetermined length may deviate significantly from the rear edge of the bag 1, and the protruding part 2 of the tape T from the front edge of the bag 1 may be short or not tight, causing the bag to When the tape attachment part of the bag 1 to which the tape T, which has the large protruding part 2 of the tape T provided only on the rear edge of the bag 1, is introduced into the bag guide 7, the tape attachment part of the bag 1 is introduced into the bag guide 7. The tip of the protrusion 2 of the tape T protruding from the top or the front edge of the bag 1 is the third detection device 1
0, then the front edge of the bag 1 blocks the light of the second detection device 9, and finally the tip of the protrusion 2 of the tape T or the front edge of the bag 1 blocks the light of the first detection device 8. cut off. Thereafter, when the tape attachment part of the bag 1 is discharged from the bag guide 7, the second detection device 9 first receives light as the trailing edge of the bag 1 passes, and then protrudes beyond the trailing edge of the bag 1. The third detection device 10 receives light as the rear end of the protrusion 2 of the tape T passes, and finally the first detection device 8 receives light as the rear end of the protrusion 2 of the tape T passes.

For this reason, the first detection device 8, the second detection device 9,
The third detection device 10 is S 1 ″ and S ₁ ″ in FIG. 9, respectively.
Output signals such as S ₂ ″ and S ₃ ″ are generated, and these output signals are sent to the respective photoelectric amplifiers AMP ₁ ,
Each NOT element N ₁ , via AMP ₂ , AMP ₃ ,
When sent to N ₂ , N ₃ , each NOT element N ₁ , N ₂ , N ₃
As a result, the input signal and output signal are reversed, and at the exit of each NOT element N ₁ , N ₂ , N ₃ , n ₁ ″, n ₂ ″,
n ₃ ″, and the output signal n ₁ ″ of the NOT element N ₁ and the output signal S ₂ ″ of the second detection device 9 are connected to the transistor AND element.
When sent to A ₁ , the output signal of the transistor AND element A ₁ becomes as shown in a _{1 ″} in FIG.
The memory element _M 1 stores the pulse output Ps ″ obtained by converting the output signal n ₂ ″ of N ₂ by the differential element AD ₁ , and
The pulse output Ps'' of the differential element AD ₁ and the output signal of the NOT element N ₃ and n ₃ '' are sent to the transistor AND element A ₂ , and the output signal of the transistor AND element A ₂ is as shown at a ₂ '' in Fig. 9. becomes “0”.

Therefore, the output signal of memory element _M1 is the ninth
As shown in F ₀ ″ in the figure, the output signal is sent to power element P ₁ and power relay PR ₁ is activated.
The power relay PR ₁ generates an output signal, which activates the pilot lamp, alarm buzzer, etc. to notify that the tape T is not properly attached to the bag 1.Then, the pulse output Ps' of the differential element AD ₁ activates the memory element M ₁ . A reset will be performed.

In addition, as shown in FIGS. 1e and 1f, the tape T attached to the sewn portion 1b of the bag 1 at a predetermined length may deviate greatly from the front edge of the bag 1, causing the tape from the rear edge of the bag 1 to The protruding part 2 of the bag 2 is short or not strong, and the large protruding part 2 of the tape T is provided only on the front edge, and the tape attachment part of the bag 1 to which the tape T is attached is introduced into the bag guide 7. At first, the tip of the protrusion 2 of the tape T that protrudes from the front edge of the bag 1 becomes the third
The light of the detection device 10 is blocked, then the tip of the protrusion 2 of the tape T blocks the light of the first detection device 8, and finally the leading edge of the bag 1 blocks the light of the second detection device 9. Thereafter, when the tape attachment part of the bag 1 is discharged from the bag guide 7, the rear end of the protruding part 2 of the tape T that slightly protrudes from the rear edge of the bag 1 or the bag 1
The third detection device 10 receives light due to the passage of the trailing edge of the bag 1, then the second detection device 9 receives light due to the passage of the trailing edge of the bag 1, and finally the rear end of the protrusion 2 of the tape T or the bag 1 The first detection device 8
receives light.

For this reason, the first detection device 8, the second detection device 9,
The third detection device 10 is located at S 1 and S ₁ in FIG. 10, respectively.
Output signals such as S ₂ and S ₃ are generated, and these output signals are transmitted to the respective photoelectric amplifiers AMP ₁ and AMP 1 , respectively.
Each NOT element N ₁ , via AMP ₂ , AMP ₃ ,
When sent to N ₂ , N ₃ , each NOT element N ₁ , N ₂ , N ₃
The input and output signals are reversed and each NOT
At the exits of elements N ₁ , N ₂ , N ₃ , n ₁ , n ₂ in FIG.
, n ₃ , and the output signal n ₁ of the NOT element N ₁ and the output signal S ₂ of the second detection device 9 are connected to the transistor.
When sent to AND element A ₁ , the transistor AND
The output signal of element A ₁ becomes “0” as shown in a ₁ in FIG. 10, and the output signal of memory element M ₁ becomes “0” as shown in
It is not stored as “0” like F ₀ in the figure,
In addition, the output signal n ₂ of NOT element N ₂ is
Pulse output Ps converted by AD ₁ and NOT element
The output signal n of N ₃ and the transistor AND element A ₂
, and the transistor AND element _A2 generates a pulse output like _a2 in FIG.

Therefore, the one-shot pulse generator 11 converts the pulse output _a2 of the transistor AND element _A2 into the output signal of _P0 in _FIG.
, power relay PR ₁ is activated, power relay PR ₁ generates an output signal, and activates a pilot lamp, alarm buzzer, etc. to notify that the tape T is not properly attached to bag 1.

That is, is the length of the protruding portion 2 of the tape T protruding from the front edge of the bag 1 equal to the distance between the first detecting device 8 and the second detecting device 9 in the traveling direction?
If the length of the protruding portion 2 of the tape T from the trailing edge of the bag 1 is equal to or slightly larger than the distance between the second detecting device 9 and the third detecting device 10 in the traveling direction, The third detecting device 10, the first detecting device 8, and the second detecting device 9 operate in this order, and then the second detecting device 9, the third detecting device 10, and the first detecting device 8 return to the inactive state in that order. death,
If the transistor AND elements A ₁ and A ₂ do not generate a defective signal and are activated or deactivated in any other order, one of the transistor AND elements A ₁ and A ₂ generates a defective signal.

In addition, when a defective signal is generated, the signal generator is activated, and the output signal of the signal generator can be used to activate the removal device for bags with defective tape attachment, or to automatically stop the entire device. It is possible.

Effects of the Invention As described above, according to the bag tape attachment defect detection device of the present invention, the sewing means, the tape supply means, and the tape attaching means are sequentially arranged along the transport direction of the transport means. a third detection device and a first detection device are respectively disposed in that order along the transfer direction of the transfer device in a step subsequent to the tape attaching device;
A second detection device is provided below between the third detection device and the first detection device.
a detection device is arranged, and the first detection device is connected to the first detection device.
The second detection device is connected to the first AND circuit via a NOT circuit, the second detection device is connected to the first AND circuit, and the second detection device is connected to the second detection device via a second NOT circuit and a differentiating circuit. the third detecting device is connected to the second AND circuit via a third NOT circuit;
By connecting the output sides of the AND circuit and the second AND circuit to the signal generator, a protruding part of the tape attached to the sewing part of the upper end of the bag at a predetermined length protrudes from both edges of the bag. If for some reason the tape is not properly attached due to a large deviation from the front or rear edge of both edges of the bag, immediately
An AND circuit or a second AND circuit can detect a tape attachment failure and generate a failure signal, and this failure signal can be used to activate a pilot lamp, an alarm buzzer, or a removal device such as a bag with a tape attachment failure. It is possible to stop the operation and the entire device, prevent defective bags from being mixed with bags to which the tape has been properly attached, and save time and labor such as re-inspection.

[Brief explanation of the drawing]

Figures 1a and 1b are front views showing the bag in its normal state after the tape is attached, and Figures 1c to 1f are
Front view showing the defective state of the bag after attaching the tape, 2nd
The figure is a schematic front view showing the overall layout of the opening sewing machine equipped with the bag tape attachment defect detection device according to the embodiment of the present invention. The figure is an overall electrical circuit diagram, Figure 5 is a front view when detecting the front end of a bag with tape attached, Figure 6 is a front view when detecting the rear end of a bag with tape attached, Figures 7 and 8 are timing charts when tape attachment is normal, Figure 9 is a timing chart when tape attachment is defective, and Figure 10 is the timing chart when tape attachment is defective in another state. It is a chart diagram. 1...bag, 1a...upper end, 1b...sewn part,
2...Protrusion part, 3...Transfer conveyor, 4...Sewing machine part, 5...Tape roll, 5a, 5b...Drawer roll, 5c...Tape guide, 5d...Arm, 5e...Solenoid mechanism, 5f... cutter, 6... heat seal drive device, 7... bag guide, 8... first detection device, 9... second detection device, 10... third detection device, 11... one shot pulse Generator, T...tape, AMP ₁ ,
AMP ₂ , AMP ₃ ...Photoelectric amplifier, N ₁ , N ₂ , N ₃
...NOT element, AD ₁ ... Differential element, PR ₁ ... Power relay, A ₁ , A ₂ ... Transistor AND element, M ₁ ... Memory element, P ₁ ... Power element.

Claims (1)

[Claims] 1. A sewing means, a tape supply means, and a tape attaching means are sequentially arranged along the transport direction of the transport means,
A third detection device and a first detection device are respectively arranged in that order along the transfer direction of the transfer device in the next step of the tape attaching device, and a third detection device and a first detection device are arranged below between the third detection device and the first detection device. 2. Place the detection device,
The first detection device is connected to a first AND circuit via a first NOT circuit, the second detection device is connected to the first AND circuit, and the second detection device is connected to a second NOT circuit. and a differentiation circuit to the second AND circuit, and the third detection device is connected to the second AND circuit via a third NOT circuit.
the first AND circuit and the second AND circuit.
A bag tape attachment defect detection device characterized in that the output side of an AND circuit is connected to a signal generator.