JPH09254279A - Flap knife positioning device of corrugated cardboard box making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically alter the overlap length of a corrugated cardboard sheet by combining the stopper attached to a flap knife and a guide ring having a dovetail groove and the cavity part connected thereto and combining the stopper and a press pin means pressing the same. SOLUTION: A circumferential guide ring 22 having a dovetail groove 21 is attached to a slotter head and a flap knife 3 is fitted in the dovetail groove 21 in a slidable manner. A stepped hole 24 is provided in the flap knife 3 and a stopper 26 is attached to the hole 24 in a slidable manner through a bush 25. A plurality of cavity parts 30 are formed in the shoulder part of the dovetail groove 21 and the hook 29 of the stopper is engaged with the cavity parts 30 with the stopper 26 pushed up by a compression spring 28. By this constitution, the flap knife 3 is prevented from moving on the guide ring 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for positioning a flap knife of a cardboard box making machine with respect to a slotter knife.

[0002]

2. Description of the Related Art In a corrugated board box making machine, when a corrugated board sheet is made, a margin for overlapping the sheets, that is, a flap is required.

FIG. 5 shows a developed view of the corrugated board sheet 50. In FIG. 5, F is the flap, which is usually indicated by F ′ in order to reinforce the box in the corrugated cardboard sheet 50 and to maintain the strength of the joint portion (joint portion by adhering glue). An overlapping part (hereinafter referred to as “overlap”) is often provided.

Length of the overlap F '(a in FIG. 5)
The appropriate value is selected depending on the size of the box and the purpose of packaging.

FIGS. 6A and 6B show the principle of processing the flap F. 6, 1 and 2 are slotter knives for processing a pair of grooves, 3 and 4 are a pair of flap knives for processing the flap F, and both knives 1, 2 and 3 and 4 of the slotter shaft 6 are provided. The corrugated cardboard sheet 50, which is attached to the outer circumference and rotated, is fed in the horizontal direction so as to be subjected to the groove processing and the flap processing.

In processing the corrugated cardboard sheet 53,
To change the length A of the flap F shown in FIG.
As shown in (A), the relative positions of the slotter knives 1 and 2 and the flap knives 3 and 4 in the circumferential direction are changed.

The relative position can be changed manually as well as automatically as proposed in Japanese Utility Model Publication No. 7-39628. In FIG. 8, the above-mentioned fairness 7-
A summary of what is proposed in 39628 is given.

In FIG. 8, knife holders 56 and 57 having flap knife front blades 3 and rear blades 4 mounted on the outer periphery thereof.
The differential gear mechanism 54A or 54B is connected to the input end of the differential gear mechanism 54A or 54B, and the input ends of the differential gear units 54A and 54B are connected to the motors 55A and 55B, respectively. The positions of the flap knives 3 and 4 are changed by changing the combination of the differential gear units 54A and 54B and the motor.

[0009]

In the flap knife positioning device shown in FIG. 8 (the device of Japanese Utility Model Publication No. 7-39628), the front and rear flap knives 3, while the corrugated board box making machine is in operation, Although there is an advantage that the length of the overlap can be changed by changing the position of No. 4, the dedicated differential gear units 54A to 54C and the motors 55A to 55C.
It is necessary to provide a plurality of gears or to provide extra shafts and gears for gear transmission.

Therefore, such a conventional positioning device is
There is a problem that the device becomes large and requires a large installation space, and the structure becomes complicated and the cost becomes high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flap knife positioning device capable of automatically changing the overlap length of a corrugated board sheet with a simple and miniaturized structure.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems of the present invention, the first means is the slotter head and the slotter attached to a rotationally driven slotter shaft so that they cannot rotate relative to each other. A pair of guide rings, each of which is attached to a rotating ring provided so as to be rotatable relative to the head, has a circumferential dovetail groove and a plurality of recesses circumferentially along the dovetail groove, and A flap knife that is slidably mounted on each guide ring in the circumferential direction,
Attached to the flap knife in the radial direction of the slotter shaft, provided with a stopper that disengages the guide ring and the flap knife with a spring, and by disengaging the stopper and the recessed portion of the guide ring, A flap knife positioning device for a corrugated board box making machine, characterized in that the guide ring and the flap knife are engaged and disengaged.

The second means, in addition to the first means, pushes the stopper to release the engagement between the flap knife and the guide ring and prevent the flap knife from rotating. A means is provided, and the push pin means is configured to rotate the slotter shaft by a circumferential indexing device to change the relative position between the flap knife and the slotter knife when the push pin means is pressing the stopper. It is in.

According to the above means, when the stopper is engaged with the recess of the guide ring by the elastic force of the spring, the flap knife to which the stopper is attached and the relative rotation of the guide ring are blocked. As a result, the flap knife is circumferentially locked with respect to the slotter knife at the position of the recess where the stopper is engaged, and the flap has a flap length corresponding to the pitch of the recess. Processing is possible.

Further, after the stopper attached to the flap knife is positioned just below the push pin means, the push pin means is operated to push the stopper to release the engagement between the guide ring and the flap knife, and the guide ring. The slotter knife fixed to the can be moved in the circumferential direction,
Stop the flap knife from moving in the circumferential direction. In this state, the indexing device rotates the slotter head to which the slotter knife is attached to move the slotter knife in the circumferential direction with respect to the flap knife. As a result, the relative position of the two is set.

As described above, according to the means of the present invention, the stopper and the guide ring having the dovetail groove and the recessed portion are combined with each other, and the stopper and the push pin means are combined with each other. The overlap dimension can be changed without using a complicated and high-cost device such as a dedicated differential gear device like the conventional one.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5 and 7. In FIG. 1, reference numeral 5 is a frame, and a slotter shaft 6 is rotatably supported on the frame 5. The slotter shaft 6 is configured to rotate once every sheet passes through the indexing device 8 by a drive gear 7 to which power is transmitted from a printing unit (not shown), for example.

That is, 10 is a motor of the indexing device 8. When the planetary gear support arm 9 is rotated by the motor 10, the rotational phase of the unit and the slotter shaft 6 changes, as shown in FIG. Groove 50 for seat 50
The position of A is changed in the sheet advancing direction. This means that when the motor 10 is rotated while the machine is stopped, that is, when the drive gear 7 is stopped, the slot shaft 6 and the entire head and knife mounted on this shaft rotate. . Incidentally, the planetary gear support arm 9
Alternatively, a pulse oscillator (not shown) is attached to the motor 10 and controls so that the rotation angle of the slot shaft 6 is set to a predetermined angle.

A slotter head 11 is attached to the slotter shaft 6.
Are attached via the keys 12. Therefore, the slotter head 11 cannot rotate in the circumferential direction with respect to the slotter shaft 6, but can slide in the axial direction.

A rotating ring 13 is rotatably attached to the outer circumference of the slotter head 11. Further, a slotter knife 1 for processing a front side groove is attached to the slotter head 11, and a slotter knife 2 for processing a rear side groove is attached to the rotary ring 13, respectively, and the rotary ring 13 is mounted on the slotter head 11. By sliding in the circumferential direction at, the a dimension in FIG. 5 is changed.

An internal gear 14 is fixed to the rotary ring 13, and the internal gear 14 meshes with a spline shaft 15 rotatably supported by the slotter shaft 6.
The spline shaft 15 is connected to a gear 17 on the slotter shaft 6 via a differential gear unit 16, and when the sun gear 18 of the differential gear unit 16 is stationary, the slotter shaft 6 rotates. Also, the spline shaft 15 is a slotter shaft 6.
It is configured not to rotate relative to. On the other hand, when the sun gear 18 is rotated by the motor 19, the spline shaft 15 rotates relative to the slotter shaft 6,
The internal gear 14 and the rotary ring 13 that mesh with the spline shaft 15 also rotate. As a result, the slotter knife 2 fixed to the rotary ring 13 moves, and the dimension a in FIG. 5 is changed.

The differential gear unit 16 and the motor 19 connected to the differential gear unit 16 are controlled by a controller (not shown) so as to store their positions and rotate by a predetermined angle.

Reference numeral 22 denotes a guide ring which is circumferentially provided with a groove 21. The guide ring 22 is attached to the slotter head 11, and a guide ring 23 having the same structure as the guide ring 22 is a rotary ring. It is attached to 13. Further, the flap knives 3 and 4 are slidably fitted in the dovetail grooves 21 of the guide rings 22 and 23. Since the flap knife 4 is attached to the rotary ring 13 via the guide ring 23 as described above, it normally moves together with the slotter knife 2.

As shown in FIG. 2, the flap knives 3 and 4 are provided with stepped holes 24 (FIG. 2 shows the flap knife 3, but the flap knife 4 has a similar structure). A stopper 26 is slidably mounted in the hole 24 via a bush 25. The stopper 26 is pushed upward by a compression spring 28 via a pin 27 penetrating the stopper 26, so that the step portion 24a of the hole 24 is formed.
Is in contact with Further, in the lower part of the stopper 26,
As shown in FIG. 3, a wide hook 29 is fixed.

On the other hand, as shown in FIG. 4, a plurality of recesses 30 are formed in the shoulder portion of the dovetail groove 21 of the guide rings 22 and 23, and the stopper 26 is pushed up by the compression spring 28. In this state, the hook 29 of the stopper engages with the recess 30.
As a result, the flap knives 3 and 4 are prevented from moving on the guide rings 22 and 23. The pitch of the plurality of recesses 30 corresponds to the overlap length A in FIG.

As described above, since this overlap is provided to reinforce the box and the adhesive portion, it is not necessary to strictly set it in a stepless manner, for example, 3, 4, 5, 6c.
Even if the dimensions are set intermittently, such as m, it is practically sufficient. FIG. 4 shows an example in which four types of dimension settings can be made.

As shown in FIG. 1, a screw shaft 31 is rotatably supported on the frame 5, and a pusher 32 is fitted on the screw shaft 31. The pusher 32 is provided to move the slotter head 11 in the axial direction when the dimensions are changed, and a push pin 34 is attached to the tip of the pusher 32 via an air cylinder 33. As shown in FIGS. 2 and 3, the push pin 34 engages with the stepped hole 24 and the stopper 26 when the stepped hole 24 of the flap knives 3 and 4 is below the push pin 34. It is designed to be pushed to the guide ring 22 side. When the stopper 26 is pushed in this way, as shown by the chain line in FIG. 3, the hook 29 moves to the dovetail groove 21 of the guide ring 22, and the flap knife 3 can slide on the guide rings 22 and 23. .

Next, a method for changing the dimensions of the flapper knives 3 and 4 will be described. When the production of one step is completed and the machine is stopped, the stop angle of the slotter shaft 6 is
This is controlled so that it is always stopped at a fixed position or an arbitrary position, and the stop position is detected by a detection means (not shown). Based on this, the rotation angle for positioning the stopper 26 below the push pin 34 is calculated by a known calculation means, and this rotation angle is instructed to the motor 10 for index adjustment. As a result, the stopper 26 is moved to a position right below the push pin 34.

Next, the air cylinder 33 is operated to push the stopper 26 downward by the push pin 34. As a result, the push pin 34 engages with the stepped hole 24 to lock the movement of the flap knife 3 in the circumferential direction, and release the engagement between the hook 29 of the stopper 26 and the recess 30. This allows the slotter knife 1 fixed to the guide ring 22 to move in the circumferential direction. In this state, the indexing device 8 is operated to issue a command to the motor 10 to rotate the slotter shaft 6 by the difference required for changing the overlap length. When the slotter shaft 6 is rotated by the motor 10, only the slotter knife 1 fixed to the slotter head 11 moves, and the flap knife 3 is locked in the circumferential movement by the push pin 34 as described above. Therefore, the relative position between the flap knife 3 and the slotter knife 1 can be changed.

Similar to the above, the other flap knife 4
Is moved below the push pin 34 by the indexing device 8 and the same operation as above is repeated, whereby the size of the overlap on the flap knife 4 side can be changed.

[0031]

The present invention is configured as described above.
According to the present invention, the stopper attached to the flap knife is combined with the guide ring having the dovetail groove and the recessed portion connected to the dovetail groove, and the stopper and the push pin means for pressing the stopper ring are combined. That is, the flap knife can be positioned with a change in the overlap size by a very simple and small means. As a result, a complicated and high-cost device such as a differential gear device like the conventional one is not required, and a compact, compact and low-cost positioning device can be obtained.

[Brief description of drawings]

FIG. 1 is a structural diagram of a flap knife positioning device according to an embodiment of the present invention.

FIG. 2 is a detailed view of a mounting portion of the flap knife according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view showing an engaged state of a guide ring and a stopper (a view taken along the line BB in FIG. 3).

FIG. 5 is a development view of a corrugated board sheet.

FIG. 6 is a diagram showing a flap processing principle.

FIG. 7 is a diagram showing a state of defective indexing.

FIG. 8 is a configuration diagram showing an example of a conventional flap knife positioning device.

[Explanation of symbols]

 1 slotter knife (front) 2 slotter knife (rear) 3 flap knife (front) 4 flap knife (rear) 5 frame 6 slotter shaft 8 indexing device 10 motor 11 slotter head 13 rotating ring 15 spline shaft 16 differential gear device 19 Motor 21 Dovetail groove 22 Guide ring 23 Guide ring 24 Stepped hole 25 Bushing 26 Stopper 28 Compression spring 29 Hook 30 Recessed portion 31 Screw shaft 32 Pusher 33 Air cylinder 34 Push pin 50 Cardboard sheet

Claims (2)

[Claims] 1. A slotter head fixed to a rotationally driven slotter shaft such that the slotter shaft cannot rotate relative to the slotter shaft, and a rotary ring rotatably mounted to the slotter head so as to rotate relative to the slotter head. A pair of guide rings provided with a plurality of recesses in the circumferential direction along the groove, a flap knife slidably mounted on each of the guide rings in the circumferential direction, and the slotter on the flap knife. The guide ring and the flap knife are mounted in the radial direction of the shaft and provided with a stopper for engaging and disengaging the guide ring and the flap knife with a spring, and by disengaging the stopper and the recess of the guide ring. A flap knife positioning device for a corrugated board box making machine, characterized in that it is configured to engage and disengage. 2. A push pin means for pressing the stopper to release the engagement between the flap knife and the guide ring, and for preventing the flap knife from rotating, the push pin means pressing the stopper. When
2. A flap knife positioning device for a corrugated board box making machine according to claim 1, wherein the slotter shaft is rotated by a circumferential indexing device to change the relative position of the flap knife and the slotter knife.