JPS6260984B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention is a common conveyor of transfer roller type that holds several strips of bag material strips made of synthetic resin printed with patterns, characters, trademarks, etc. at predetermined pitches. A method for transporting bag material strips, in which the bag material strips are transported by a bag material strip, and at each stop, each bag material strip is processed into individual bags by a common processing device such as a heat sealer cutting device. and equipment.

(Prior Art and Problems) Conventionally, in this type of method and device, bags are displayed at a predetermined pitch on several strips of bag material that are transported by a pair of clamping type conveyors, which generally have a fixed size per transport. A mark detection device for detecting register marks (hereinafter simply referred to as marks) is provided near the transport path of each bag material band,
The marks on the several bag material strips are aligned in a straight line in the transverse direction of these several bag material strips, and the conveyor transports each mark by a length slightly longer than one pitch. When a mark is detected by any of the mark detection devices near the end, the conveyor is stopped and a braking body is brought into contact with the bag material strip preceded by the mark on the input side of the conveyor during the next transfer period. Then, brake (or transfer load) is applied to this, causing slippage between the conveyor and the conveyor, thereby shortening the transfer dimension.
The marks on all bag material strips are always aligned in the transverse direction.

However, since the braking body comes into contact with the leading bag material band, if the braking body is applied to the leading material even by a very small difference, the next transfer will be delayed too much, resulting in unnecessary braking, and the braking will be repeated. The operating rate of the body increases, and the lifespan of mechanical or electrical components used to operate the body becomes shorter.

Therefore, in order to improve this drawback, a method and device for separating all the braking bodies from the bag material bands when all the bag material bands are only slightly displaced is disclosed in Japanese Patent Application Laid-open No. 55-161636. Although it is disclosed in the publication (same as FIG. 8 of the present application) (the specific structure will be described later when explaining the structure of the present invention), the size of one transfer of the conveyor was originally one pitch of the mark. In order to set it slightly longer than
The transfer dimension of the whole bag material strip tends to be transferred longer than one pitch, and even if there is no difference in the transfer dimension of several bag material strips at that time, the transfer dimension of the entire bag material strip when it becomes an individual bag will tend to be longer than one pitch. The arrangement of the marks may be different from that when braking is applied, or the bag on each strip when no braking is applied, that is, when neither braking body is in contact with the bag material strip, is different from the bag when other braking is applied. There is a tendency for the bags to become slightly longer, and the bag making dimensions as a whole will be uneven.

(Problems to be Solved) The present invention is a method and device for improving the above-mentioned drawbacks of the prior art. This is to ensure that there are not many bags, and that when each bag is assembled, letters, patterns, etc. can be placed in accurate positions.

Another object of the present invention is that when the several strips of bag material are transported by a conveyor comprising a common transfer roller, the marks of the several strips of bag material are aligned in a transverse direction. When you line up,
This is to obtain a device that allows the braking body to come into contact with all the bag material strips, and to ensure stable transportation as a whole.

(Means for Solving the Problems) The present invention arranges a plurality of bag material strips with register marks displayed at predetermined intervals in parallel, and conveys each strip by a conveyor consisting of a common pair of pinching type transfer rollers. The register mark is transferred in increments slightly longer than one pitch of the register mark, and the register mark displayed on each bag material band reaches a predetermined position near the end of each intermittent transfer. When the first or all marks reach a predetermined position, the conveyor is stopped, and the mark that reaches the predetermined position one after another during operation until the conveyor stops is When a predetermined position is reached earlier than a predetermined time, a braking body is brought into contact with the bag material strip of that system during the next transfer period, and the transfer dimension of the bag material strip contacted by this braking body is determined as the transfer dimension of other bag material strips. The method for further shortening the bag material is characterized in that when the marks of all the bag material strips reach a predetermined position within a predetermined time, the braking body is brought into contact with the bag material strips of all systems during the next transfer period. This is a method for transferring bag material strips in a bag making machine.

Another invention includes a rack whose one end is pivotally supported by a crank fixed to a continuously rotating main shaft, a rack which reciprocates in relation to the crank rod, a pinion shaft which meshes with one of the fan-shaped gears, and a pair of clamping type gears. An electromagnetic clutch brake is provided between the transmission mechanism and the conveyor consisting of transfer rollers, and the clutch engages only during the feeding stroke of the crank. A braking device having a braking body that contacts the path and applies a transfer brake (or load) is provided in the vicinity of the transfer path of each bag material strip.
A mark detection device is provided to detect the register mark displayed on the bag material strips, and when the bag material strips are transferred in such a manner that the length of one transfer is longer than the mark pitch of the several strips of bag material, which one of the mark detection devices In response to the mark detection signal, the clutch of the electromagnetic clutch brake is released and the brake is applied, and when among the respective mark detection signals, the preceding mark detection signal is earlier than the last mark detection signal by a predetermined time or more. , generates the previous mark detection signal, and uses this to command the braking body of the braking device provided on the bag material band of the system of the mark detection device to contact the braking body with the bag material band of that system during the next transfer period. In a device in which each bag material band is provided with a braking device that serves as a signal, the output portion of the NAND element that generates an output receives the NAND signal of the operation command signal of the braking device for each bag material band as an input signal. This is a bag material belt transfer device in a bag making machine, characterized in that it is connected as an OR circuit input section to an operation command signal input section of a braking device.

(Embodiments) For convenience of explaining the present invention, a typical embodiment of the apparatus invention for carrying out the method invention of this application will be described based on the drawings.

In the figure, 10 is a bag making machine, and this main shaft 1
1 is continuously rotated in one direction by a motor 12. A crank 13 is fixed to one end of this main shaft 11, and the other end of a crank rod 14 connected to this main shaft has a fulcrum 15 that is connected to the machine of the bag making machine 10. A shaft 19 of a pinion 18 connected to a sector gear 17 supported on a frame 16 and meshing with the sector gear 17 is directly or indirectly connected to one shaft of a conveyor 20 consisting of transfer rollers, and this pinion An electromagnetic clutch brake 21 is interposed between the shaft 19 and the transmission shaft of the conveyor 20, and the electromagnetic clutch brake 21 is engaged only during the feed stroke of the crank 13.
The clutch is engaged and the brake is disengaged, and during the return stroke of the crank 13, the clutch is disengaged and the brake is engaged.

The device of the present invention may be the same even if the crank rod 14 and sector gear 17 described above are replaced by a rack, and this rack is directly engaged with the pinion 18.

The conveyor 20 conveys bag material strips Fa of 2 to 6 strips (3 strips in the illustrated case).
Transport Fb and Fc. Generally, on the carry-in side of this conveyor 20, there are the several bag material bands Fa, Fb, Fc.
A common welding device 27 for processing the bag material strips Fa, Fb, and Fc wound into individual rollers is provided with sheet support devices 22a, 22b, and 22c for supporting the bag material strips Fa, Fb, and Fc. Bag material belt Fa, Fb,
In Fc, mark detection devices 24a, 24b, and 24c, which detect marks (including letters and part of a pattern) 23a, 23b, and 23c at substantially the same pitch, are installed on the respective bag material bands Fa, Fb, and Fc. It is located near the transfer path. Further, on the carry-in side of the conveyor 20, electromagnetic braking devices 26a, 26b, and 26c having braking bodies 25a, 25b, and 25c that contact the respective bag material bands Fa, Fb, and Fc are provided. 2
8 is a cutting device provided on the discharge side of the conveyor 20.

The welding device 27 and cutting device 28 that process the aforementioned inner bag material bands Fa, Fb, and Fc are not limited to the arrangement shown in the drawings, and a hot knife type welding device may be provided at the position of the cutting device 28. Other devices such as perforation and printing may also be added.

Such a device uses marks 23a, 23b, and 23c provided on each bag material band Fa, Fb, and Fc to determine the transfer size per time when the bag material bands Fa, Fb, and Fc are intermittently transferred by a common conveyor 20. It is assumed that the length is adjusted to be longer than one pitch, and the marks 23a, 23b, 23c are detected by the mark detection devices 24a, 24b, 24c near the end of one feed. can be,
The operation control device of this bag making machine includes a control circuit 30 that performs the following control operations.

That is, after carrying out the above-mentioned setup, the bag making machine is operated, and the mark detection devices 24a, 24b, 2
The clutch of the electromagnetic clutch brake 21 provided on the transmission shaft of the conveyor 20 is released in response to the detection signal of one of the signals 4c (generally the signal that arrives first), the brake is engaged, and the conveyor 20 is first started. There is a control circuit 29 for stopping.

Further, the control circuit 30 includes the circuit of the known control circuit (see FIG. 8) shown in the section of the prior art described above in a manner similar to that shown in FIG.

That is, the circuit of this known part is constructed as shown in the drawings, and its operation is clear from the drawing, but it is constructed and operates as follows.

In FIG. 8, when each bag material band Fa, Fb, and Fc has been transferred by the transfer roller 20 by approximately 70 to 80% (the closer this percentage is to 100, the better) of the size to be transferred, the main shaft 11, one input of AND elements 39a, 39b, and 39c for each line of each mark detection device 24a, 24b, and 24c is turned on;
Of b and 39c, the preceding bag material bands Fa and Fb
If other input signals of AND elements 39a, 39b corresponding to
b issues an output signal to the next AND element 40a, 40b, and at the same time, the flip-flop 41c of the series corresponding to the bag material band Fc with the longest delay is inverted by the input signal from the mark detection device 24a or 24b. Since one input to the next AND element 40c is absent, even if the mark detection signal 24c generates a mark detection signal and the AND element 39c generates an output signal, the AND element 40c does not generate an output.

Therefore, the signals outputted from the AND elements 40a, 40b directly become the output signals of the instruction output sections 33a, 33b, and actuate the braking devices 26a and 26b, but do not actuate the braking device 26c.

In addition, in the above-mentioned circuit, on-time timers 38a, 38b, 38c (usually 10 ^-3
seconds to 10 ^-4 seconds) are provided downstream of the AND elements 39a, 39b, and 39c, so that by the time these timers 38a, 38b, or 38c output, the mark detection devices 24a, 2 of other series
When 4b, 24a, 24c or 24b, 24c generates an output, all flip-flops 41
a, 41b and 41c are reversed. The braking devices 26a and 26b are also in the non-braking state for the preceding bag material bands Fa and Fb.

Therefore, in the conventional device, the braking devices 26a, 26 are not applied to the preceding bag material bands Fa, Fb, or Fc other than the most delayed.
b or 26c acts, these bag material bands
By causing slippage between Fa, Fb or Fc and the transfer roller 20, the transfer dimension is shortened, and the bag material band with the longest delay is
Fa, Fb or Fc mark detection device 24a, 24b
Or, if the time until the output signal of 24c is shorter than the set time of timer 28a, 28b or 28c, that is, almost simultaneously, the bag material bands Fa, Fb
Or also for Fc braking device 26a, 26b or 26c
does not work.

Therefore, in the conventional device, if all the mark detection signals are within the set time of the timer 28a, 28b or 28c, all the brake devices 26a, 26b are activated.
Or 26c will not work.

Further, this conventional control circuit has the above-mentioned comparison circuit 4.
2a, 42b and 42c and holding circuits 43a, 43
b and 43c are provided, the above-mentioned brake body 2
If the OFF or ON output signals 5a, 25b and the activated OFF or ON output signals are the same signal, the effect is that the same output continues to be OFF or ON (see FIG. 8).

The above bag making machine control method and apparatus are prerequisites for the present invention.

In this invention, when all the command signals of the command output parts 33a, 33b, 33c for operating the brake bodies 25a, 25b, 25c by the control circuit 30 are off, that is, when each mark detection signal is detected within a predetermined period of time, In other words, when entering the mark 2
3a, 23b, 23c are almost all aligned in a straight line in the transverse direction of the bag material strip, all brake bodies 2
5a, 25b, and 25c are bag material belts of each type.
Circuit 3 that outputs a command signal to contact Fa, Fb, and Fc
1 (see Figure 4).

Specifically, this circuit 31 will be explained based on FIG.
Command output parts 33a, 33 for operating c.
All these command output parts 33a, 33b, 33c of AND element 44 which takes input signals b, 33c
The AND signal 34 of the OFF signal of the output signal is used as the input signal of the OR elements 45a, 45b, and 45c with the ON signal of each command output section 33a, 33b, and 33c, and the braking is performed by these OR signals. It is configured to issue a final command signal 37 for actuating the bodies 25a, 25b, 25c.

(Effects of the method invention) As described above, in the method of the present invention, the marks 23a, 23b, 23c of the bag material bands Fa, Fb, Fc are placed one after the other, and the difference is , marks 23a, 23b, When the marks 23c are aligned in the transverse direction of the bag material strip, we used a method in which the braking body is brought into contact with all the bag material strips Fa, Fb, and Fc. The transfer of the bag material belt is stable,
The transfer roller does not lose speed, has good dimensional accuracy, and once the marks are aligned, each bag material band Fa,
As long as there is no difference in the spacing between the Fb and Fc marks 23a, 23b, and 23c, there is an effect that there will be no difference in the marks on the bag material band for several subsequent transfers. In the end, this has the effect of reducing the number of times each braking body 25a, 25b, 25c is individually controlled.

(Effects of the Apparatus Invention) Furthermore, in the apparatus of the present invention, the above-mentioned method can be carried out, and the transfer conveyor 20 is provided with bag material strips Fa, Fb, and Fc transferred by the transfer conveyor 20 in all transfer sections. Since the braking body is in contact with the part or all of the parts during transfer, there is no braking at all, resulting in stable operation, and accurate transfer dimensions are always achieved.
Command output parts 33a, 33 that operate b, 25c
The arrangement is such that when the off and on states of b and 33c are the same for the next mark, the same type of output continues to be output. For example, when using the brakes shown in FIGS. 5a, 5b, and 6, the number of times the braking bodies 25a, 25b, and 25c are operated is significantly reduced.

The control circuits in FIGS. 5a and 6 show the brake circuit 30 part of the control device in FIG. This is used for a type of bag that is separated from the bag material band.
The logic diagrams of the control circuits in FIGS. 5a and 6 are equivalent to each other.

FIG. 5b is a circuit diagram in which the relay contacts of the braking devices 26a, 26b, 26c are actuated by the final command signal shown in FIG. A signal or a NAND signal of these off causes the relay contacts to close.

The logic diagram of the control device in FIG. 7 shows the braking body 25a,
25b and 25c are used for a type of bag material strip that is in contact with the bag material band under normal conditions,
When all the mark detection signals are substantially aligned, the braking bodies 25a, 25b, and 25c are not separated from each other, that is, no signals are output.

In short, the control circuit shown in FIG.
Since the normal positions of 5a, 25b, and 25c are the contact devices, the output signals of the control circuits in FIGS. 5a and 6 are simply opposite signals, and both are equivalent means. It is.

It should be noted that the signal reception and reception in the circuit of FIG. 7 is obvious from the diagram and will therefore be omitted.

In addition, 35 and 36 are synchronous cams for inputting synchronous signals to the control devices 30 and 31, and the main shaft 1
It is provided in 1.

[Brief explanation of the drawing]

The drawings show things related to this invention, in which Fig. 1 is a mechanical side view showing the mechanical part of the device of this invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a schematic side view of the mechanical part of the device of this invention. FIG. 4, which is a front view of the braking device section, is a logic circuit diagram of the main part of the control circuit of the control device. Figure 5a
is a logic circuit diagram showing an embodiment of the logic circuit of FIG. 4 in more detail; FIG. 5b is a circuit diagram showing a relay of a braking device receiving the output signal of FIG. 5a;
FIG. 6 is a logic circuit diagram showing another embodiment, FIG. 7 is another control circuit diagram implementing this method invention, and FIG. 8 is a control circuit diagram of the prior art. Code in the figure: 10...Bag making machine, 11...Main shaft, 1
2... Motor, 13... Crank, 14... Crank rod, 15... Fulcrum, 16... Machine frame, 17
... Sector gear, 18 ... Pinion, 20 ... Conveyor, 21 ... Electromagnetic clutch brake, 23
a, 23b, 23c... mark, 24a, 24
b, 24c... mark detection device, 25a, 25
b, 25c...braking body, 26a, 26b, 26c
... Braking device, 30, 31 ... Control circuit, 33
a, 33b, 33c...command output section.

Claims (1)

[Claims] 1. A plurality of strips of bag material on which register marks are displayed at predetermined intervals are arranged in parallel and conveyed from one pitch of each register mark by a conveyor consisting of a common pair of clamping type transfer rollers. The register mark displayed on each bag material band reaches a predetermined position near the end of each intermittent transfer, and the first to all of these marks are When the conveyor reaches a predetermined position, the conveyor is stopped, and the conveyor reaches the predetermined position at least a predetermined time earlier than the last mark among the marks that arrive at the predetermined position one after another during operation until the conveyor stops. A method in which a braking body is brought into contact with the bag material strip of the system during the next transfer period when the bag material strip of the system reaches , and the transfer dimension of the bag material strip contacted by the braking body is made shorter than the transfer dimension of other bag material strips, Bags in a bag making machine characterized in that when the marks on all the bag material bands reach a predetermined position within a predetermined time, a braking body is brought into contact with the bag material bands of all systems during the next transfer period to transfer the bags. Material band transfer method. 2. One end is pivotally supported by a crank fixed to a continuously rotating main shaft, and consists of a rack that reciprocates in relation to the crank rod, a pinion shaft that meshes with one of the fan-shaped gears, and a pair of pinch-type transfer rollers. An electromagnetic clutch brake is provided between the transmission mechanism and the conveyor, and the clutch engages only during the feeding stroke of the crank. A braking device having a braking body that applies a transfer brake (or load) upon contact is provided, and a mark detection device is provided near the transfer path of each bag material strip to detect register marks displayed on these. and the clutch of the electromagnetic clutch brake is actuated by a mark detection signal from one of the mark detection devices when the plurality of bag material strips are transferred such that the length of one transfer is longer than the mark pitch of the plurality of bag material strips. When the preceding mark detection signal is earlier than the last mark detection signal by more than a predetermined time, the preceding mark detection signal is emitted, and this is used as the mark detection signal. Each bag material belt is equipped with a braking device that uses the braking body of the braking device provided on the bag material belt of the system of the apparatus as an operation command signal to bring the braking body into contact with the bag material belt of that system during the next transfer period. In the apparatus, the NAND signal of the operation command signal of the braking device for each bag material band is used as an input signal, and the output part of the NAND element that generates an output is connected as an OR circuit input part to the operation command signal input part of each of the braking devices. A bag material band transfer device in a bag making machine, characterized in that: