JPH0258181B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) This invention involves intermittently transporting a synthetic resin bag material belt by an intermittent transport conveyor, and lowering the bag material belt each time the conveyor stops. , bags, bag-like items (book covers,
This relates to a device for making diaper covers (including diaper covers), etc., and in particular, when the two strips of bag material are hung and transported by a common pair of clamping type conveyor, the information printed on each strip of bag material is used. This invention relates to a bag material belt transfer control device for ensuring that patterns, characters, trademarks, etc. are positioned at desired positions on the bag after processing.

(Prior Art) Conventionally, in this type of device, a common pair of clamping conveyors (including transfer rollers) that are driven intermittently are used.
When two strips of bag material are sandwiched in parallel so that they can slip and are transported intermittently, the amount of slip between the left and right bag material strips on the conveyor is slightly different.
Even if characters, patterns, etc. are printed on bag material strips made of the same material using the same printing machine at predetermined pitches, each pitch may be precisely are not the same, and if two such strips of bag material are intermittently transferred by a common pair of clamping conveyors, one of the bag material strips will inevitably be transferred first, and as the intermittent transfer is repeated, the difference will accumulate, and one If processing is performed to match the position of the printed pattern and letters on one bag material band, the printed pattern and letters can be cut in the middle on the other bag material band,
Alternatively, processing may become defective or impossible.

Conventionally, as a means of controlling such transfer dimensions, the bag material strip was transferred a little longer than the pitch of the register mark (including part of a pattern or letter) displayed on the conveyor for one transfer of the bag material strip. , each mark detection device detects the mark, and in response to this signal, the conveyor is stopped to shorten the conveyance dimension of the two bag material strips, and the preceding bag material strip is not allowed to carry the next bag material strip. During the period, a braking plate is brought into contact only with the bag material band to apply a transfer load to the bag material band, and by causing slippage between this and the conveyor, the preceding bag material band is brought to an appropriate transfer size. I'm trying to shorten it.

(Problems to be Solved by the Invention) However, as mentioned above, the pitch of the register marks on the two bag material strips is generally shorter on one side and longer on the other, and in certain parts of one bag material strip, When the above tendency occurs, braking is applied continuously to only one side of the bag material strip, and this biased action applies a load only to the bearing at one end of the conveyor, and also causes only one braking plate to actuate. The number of cycles increases, resulting in severe wear and tear.Also, the control plate is normally energized by a solenoid, but if only one side is continuously energized, it may cause heating and burnout.

When the difference in pitch between the register marks of the two bag material strips is large, set the transfer dimension of the conveyor so that a transfer dimension that is longer than the pitch of the longer bag material strip is sent at each intermittent transfer, and Braking must be applied to match this to the shorter pitch, and with conventional methods and equipment, it is necessary to apply extremely strong braking, making delicate adjustments difficult, and producing bags with irregular dimensions as a whole. will be done.

By the way, in this invention, when one of the two bag material bands tends to lead as described above, a different transfer load is continuously applied to that packaging material beforehand or during operation. This is to enable the strength of the transfer load to be adjusted depending on the magnitude of the tendency.

B. Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention has a common traction conveyor of a pinching type that grips two strips of bag material in parallel in a slippable manner and transports them intermittently. , a light load device is provided on the upstream side of the bag material strips, respectively, in contact with the bag material strips to apply a transfer load to them, and the bag material strip transfer path between the traction conveyor and the light load device is provided with a slight tension on these bag material strips. A common bar-shaped friction brake body is provided in this tension transfer zone, which contacts the two strips of bag material, and the axis of this friction brake body is It is provided in the transverse direction of the belt, and its position can be manually fixed in a direction perpendicular to the surface of the two bag material belts, and one of the two bag material belts is attached to the bag material belt as described above. A transfer path is formed in contact with the upper side of the friction brake body, the other bag material band is formed with a transfer path in contact with the bottom side of the friction brake body, and the friction brake body is of a relatively non-rotating diameter. It is a single large round bar, and position regulating guide rollers are placed on the machine frame immediately upstream and downstream of this round bar to regulate the bag material strip transport path, which have axes parallel to the axis of this round bar. This is a bag material band transfer size control device in a double-line bag making machine characterized by being supported.

(Operation of the invention) In a bag-making machine equipped with the device of the invention configured as described above, two strips of bag material are used.
In order to manufacture individual bags from these, these bag material strips are wound into rollers and supported on a web support device, and the consecutive bag material strips are lined up in parallel and placed on each light load device. , one of the two bag material bands is brought into contact with the upper side of the round bar serving as the friction braking body, and the other bag material band is brought into contact with the underside of this round bar, and then these are brought into contact again. Two strips of bag material are aligned in parallel and passed through position regulating guide rollers, and then sandwiched by a pair of pinch conveyors.

The two strips of bag material each have register marks marked at intervals of one bag length.

When the conveyor is operated, the two strips of bag material are transported intermittently by the conveyor.

In this case, in the device of the present invention, if either of the two bag material bands tends to lead,
The round rod is moved slightly toward the bag material band that is leading thereon, and is stopped at that position.

For example, when a bag material band whose transport path is above the round bar is ahead of the other bag material band, the round bar is slightly raised.

At this time, the area of the upper bag material band in contact with the round bar increases, and the area of the other bag material band B in contact with the lower side of the round bar decreases. Therefore, the bag material strip whose contact area with the round bar has increased is subjected to a larger transport load than the bag material strip whose contact area with the other round bars has decreased, and the transfer load between this leading bag material strip and the conveyor increases. A large slippage occurs and the transport dimensions of this bag material strip are shortened.

If one bag material band still tends to be ahead of the other bag material band, the round bar is further raised slightly.

When the bag material band on the opposite side tends to lead, the round bar is lowered.

The upper and lower limit positions of the round bar are until any bag material strip separates from the round bar and becomes a straight line.

(Example) First, an example of a general bag making machine to which the apparatus of the present invention is installed will be described.

10 is a bag making machine, and 11 is a traction conveyor that is driven intermittently to hold the bag material strips A and B in parallel (see Fig. 2), and to transfer them intermittently during this stop period. Inside, the above-mentioned two bag material bands A and B are provided with descending means (welding, welding and cutting, drilling,
(foil stamping, cutting, etc.) 13.

On the carry-in side of the conveyor 11 mentioned above, a transfer load such as friction plates 16a and 16 is applied to the bag material bands A and B.
The bag material bands A, B and the conveyor 11 are conveyed with such a clamping pressure that a slip occurs when the bag material bands A and B are brought into contact with each other.

Each bag material strip A processed by the bag making machine,
Register marks 14a, 14b are displayed at predetermined intervals on B, respectively, and the register marks 14a, 14b are displayed on the bag making machine 10.
Mark detection sensors 15a and 15b that detect 4b
are provided corresponding to the bag material bands A and B, respectively, and the conveyor 11 is controlled in its cycle by input signals from one or both of these mark detection sensors 15a and 15b. It is now being stopped.

In addition, in the illustrated embodiment, the friction plate 16a or 16b is brought into contact with the bag material strip A or B on the preceding side during the next transfer period, so that a transfer load is applied to the bag material strip. This and conveyor 11
This causes a slip between the two and reduces the length of the transport.

In this embodiment, the fabric support devices 27a, 27b for supporting the bag material bands A, B wound into rolls are provided on the most upstream side, and the fabric support devices 27a, 27b are provided on the downstream side. A feed-out roller 28 is provided for feeding out the bag material strips A and B supported by the bag material strips A and B, and furthermore, on the downstream side thereof, a roller 28 is provided as a type of light-load device that applies a slight transfer load to each of the bag material strips A and B. , is formed by a guide roller 20 supported by the machine frame 10 and a cloth 30 hooked thereon. In other words, the cloth 3 has one end of the machine frame 10 fixed to a part of the transfer path of the bag material bands A and B.
0 is formed to engage with a guide roller 29 rotatably supported on the machine frame 10, and between the guide roller 29 and the cloth 30, the bag material bands A, B
Through this, friction is generated between the cloth 30 and each of the bag material bands A and B, so that a light transfer load is applied to the bag material bands A and B.

Therefore, the transport section of the bag material bands A and B between the light load device constituted by the guide roller 29 and the cloth 30 and the conveyor 11 becomes a transport section D in which both the bag material bands A and B are under some tension. ing. During this slightly tense tension section D, a device C is installed to control the transport dimensions of these bag material bands A and B as shown below.
is provided.

The device C for controlling the transfer dimension is provided with a non-rotating round rod 17 having a relatively large diameter as a common friction braking member that contacts the two bag material bands A and B, and the diameter of the round rod is as follows. A length of about 8 to 15 cm is best. As shown in the figure, the axis of this round bar 17 is parallel to the surfaces of the two bag material bands A and B, and is provided in a direction perpendicular to the direction of transport of these bands, and is parallel to the machine frame 18 of the bag making machine 10. For example, as shown in FIG. 3, both ends 19 of the round bar 17 are
Vertical threaded rod 20 supported on machine frame 18
One end of these threaded rods 20 connects to a common drive shaft 2 via bevel gears 21 and 22.
A servo motor consisting of a reversibly rotating motor (for example, a geared motor or a stepping motor capable of forward and reverse rotation) 24 is directly connected to one end of the drive shaft 23. When the motor 24 is rotated, the two round bars 17 are stacked one above the other and are integrally provided, and these round bars 17 are also provided so as not to rotate together.

Furthermore, even if there is a round bar 17 with an oval or elliptical cross section like the two round bars of FIG. 4 integrated, as in the embodiment shown in FIG. be.

In the embodiments shown in FIG. 4 as well, the diameter of the round bar 17 is about 8 to 15 cm, which is the same as above.
Also, in the case of the oval cross section shown in Figure 5, the radius of curvature of the smallest radius of curvature is still 8 to 15 cm.
There are some degrees.

Guide rollers 25 and 26 for regulating the positions of the bag material bands A and B are supported on the machine frame in parallel with the axis of the round bar 17 immediately at the loading/unloading position of the friction braking body, that is, the round bar 17. , in the embodiments of FIGS. 1, 4, and 5, claim 1,
Embodiment of Section 4 A pair of pinching type guide rollers 25 and 26 which sandwich two bag material strips A and B from the front and back sides are supported on the machine frame 18, respectively.

The guide rollers 25 and 26 may not be a pair of pinching type rollers, but may be a single roller each, as long as there is no risk that the bag material bands A and B may sag downward as shown in FIG.

In order to manufacture individual bags from two bag material bands A and B in a bag making machine equipped with the embodiment of the apparatus of the present invention constructed as described above, these bag material bands are The belts A and B wound into rollers are mounted on original fabric support devices 27a and 27, respectively.
The bag material bands A and B that are connected from this are lined up in parallel and passed through the feeding roller 28, and the two strips are passed in parallel through the guide rollers 29 and 25, and one bag material band A or B is placed on the upper side of the round bar 17. Next, bring the other bag material band B or A into contact with the lower side of the round rod 17, respectively, and guide these two bag material bands A and B again.
are provided in parallel, pass through the guide roller 26, pass through other guide rollers 31 and 32, and are held between a pair of holding type conveyor 11. Furthermore, the bag material bands A and B in the part where the cloth 30 is hooked to the guide roller 29
Hang it on top.

Thus, the positions of the register marks 14a, 14b of the two bag material bands A, B are aligned in a straight line in the transverse direction of the bag material bands A, B.

Next, the processing means 13 applies heat to a hot knife type welding blade, for example, and register marks 14a, 14b of the two bag material bands A, B are detected by the mark detection sensor 1.
While detecting with 5a and 15b, register mark 1
The two bag material bands A and B are intermittently conveyed by the conveyor 11 while matching the mark interval pitches 4a and 14b, and each time the conveyor 11 stops, the two bag material bands A and B are transferred by the processing means 13. processed into individual bags.

In this case, in the apparatus of this embodiment, if either the register mark 14a or 14b of one bag material band A or B tends to be in front, for example, in the figure, the register mark 14 of bag material band A
If a is ahead of the register mark 14b of another bag material band B, the motor 24 is slightly rotated, the pair of threaded rods 20 are rotated to slightly raise the round bar 17, the motor 24 is stopped, and the round bar 17 is raised slightly. 17 is stopped at that position.

At this time, as shown in FIG. 6, the area of the bag material band A in contact with the round bar 17 increases and becomes within the range of angle α as shown in FIG. decreases to the range of angle θ, so bag material strip A receives a larger transfer load than bag material strip B,
Slippage occurs between the bag material belt A and the conveyor 11,
The transport dimension of the bag material strip A is shortened.

If one bag material band A still tends to be ahead of the other bag material band B, then the round bar 17
increase slightly.

On the other hand, when the bag material band B tends to be ahead of the bag material band A, the motor 24 is reversed to lower the round bar 17.

The upper limit position of the round bar 17 is the position where the bag material band B separates from the round bar 17 and becomes a straight line between the guide rollers 25 and 26, and the lower limit thereof is the same as above. The guide rollers 25 to 26
up to the position where there is a straight line between
In the embodiments of FIGS. 6 and 7, the stroke is of the same size as the diameter of the round bar 17. In the embodiment shown in FIG. 4, the stroke dimensions are the radius dimensions of the two round bars and the two round bars 17.
is equal to the sum of the dimensions between the axes of . In the embodiment shown in FIG. 5, the dimension is equal to the major axis of the round bar.

C. Effects of the Invention In the device of the present invention configured as described above, the transfer load applied to the two bag material strips is adjusted by displacing the round bar serving as a common friction braking member upward or downward. This is achieved by relatively changing the contact area between the round bar and the bag material strip, and by stopping the round bar at that position, it is possible to correct the tendency for one bag material strip to lead. and maintain its corrected state.

In addition, since the structure is extremely simple, there is no risk of failure, and since the diameter of the round bar is rod-like and relatively large, the contact surface with each bag band mentioned above can be changed greatly, and transport The load adjustment range can be widened.

(Effects unique to the embodiment) As mentioned above, in the embodiment of this invention,
The transfer load applied to the two bag material bands A and B can be adjusted by displacing the round bar 17 upward or downward.
By relatively changing the contact area between the bag material bands A and B, it is possible to correct the tendency of one bag material band A or B to be in the lead, and to maintain the corrected state. .

Furthermore, the structure is extremely simple and there is no risk of failure.

In addition, since the diameter of the round bar 17 is relatively large, that is, about 8 to 15 cm, the contact area with the bag material bands A and B can be changed greatly, so the adjustment range of the transferred load can be widened. .

The vertical movement of the round bar 17 can be done manually, or by rotating the motor in forward and reverse directions or stopping it, but the mark detection sensor 15a,
Automatic control can be facilitated by installing a control device that determines the order of inputs to the motor 15b and rotates the motor forward or reverse in a stepwise manner depending on the sign of the signal. The stepwise rotation of the motor is performed by using a step motor, by using a one-turn clutch, or by setting the motor operating time in advance with a timer.

In addition, conventionally known friction plates 16a and 16b that come into contact with and separate from the bag material bands A and B every time they are fed.
If used in conjunction with a transfer load control device having a transfer load, the effect of controlling the transfer dimensions of the two bag material bands A and B will be further improved.

The embodiments shown in FIGS. 1 to 3 have the simplest structure, with only one round bar serving as the friction braking body. The embodiment shown in FIG. 4 has two friction braking bodies, has a wide movable range, and is easy to make fine adjustments. The movable range of the round bar is also widened in the embodiment shown in FIG.

In this specification, when the round bar 17 does not rotate, it means that it does not rotate due to contact resistance with the bag material bands A and B, and in reality, both ends 19 shown in the figure serve as bearing members. The round bar 17 and the bearing member are a sliding fit, and both are fixed with a set screw.

Therefore, a part of the surface of the round bar 17 is covered with the bag material band A.
If the round rod 17 is damaged due to long-term contact with the round rod 17 and B, the life of the round rod 17 can be further extended by changing the phase in which the round rod 17 is set.

In this invention, the relationship between the vertically moving round bar 17 and the positioning guide rollers 25 and 26 is relative, so the round bar 17 is fixed and the guide rollers 25 and 26 for carrying in and out are moved up and down. Even if it is made to do so, the invention is the same.

[Brief explanation of the drawing]

The drawings show typical embodiments of the present invention; FIG. 1 is a mechanical side view of the entire bag making machine incorporating the device of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a front view taken along the line 3-3 in FIG. 1; FIG. 4 is a side view of another embodiment of the round bar; FIG. Figure 6 is a side view showing the relationship between the vertical movement of the round bar and the contact area.
The figure is a side view showing another embodiment of the guide roller for position regulation. Main symbols in the diagram: 10...Bag making machine, 11...Conveyor, 13...Processing means, 17...Round bar, 1
8... Machine frame, 25, 26... A pair of guide rollers,
A, B...Bag material belt, C...Control device, D...Transfer section where there is some tension.

Claims (1)

[Scope of Claims] 1. A common gripping type traction conveyor that grips and transfers two strips of bag material in parallel in a slippable manner, and on the upstream side of the conveyor, each strip is in contact with the bag material strip,
A light load device that applies a transfer load to these is provided, and a bag material strip transfer path between the traction conveyor and the light load device is a tension transfer section in which a slight tension is applied to these bag material strips, and this tension transfer section A common rod-shaped friction braking body is provided inside the bag material strips, and the axis of this friction braking body is provided in the transverse direction of each of the bag material strips, and The bag material strip is provided so that its position can be moved and fixed in a direction perpendicular to the surface of the material strip, and one of the two bag material strips is formed with a transfer path in contact with the upper side of the friction braking body. The other bag material band has a transfer path in contact with the lower side of the friction braking body, and the friction braking body is a round bar with a relatively large diameter that does not rotate. A double-thread bag making machine characterized in that position regulating guide rollers for regulating the bag material strip transport path having axes parallel to the axis of the round bar are supported on the machine frame immediately upstream and downstream, respectively. Bag material belt transfer size control device. 2. The friction braking body is composed of two non-rotating round bars that are parallel to each other and stacked one above the other, each having a relatively large diameter. 2. A bag material strip transfer dimension control device in a double-thread bag making machine according to claim 1, wherein the device operates integrally. 3. The friction braking body is a round bar that does not rotate, has an oval cross-section, and has a relatively large radius of curvature. A bag material band transfer dimension control device in a hanging bag making machine. 4. The bag material strip transfer size control device in a double-thread bag making machine according to claim 1, wherein each of the position regulating guide rollers is a pair of pinch-type guide rollers that approach each other.