JPH04239428A - Replacing device for strip material roll - Google Patents

Abstract

PURPOSE: To provide a roll changing device capable of surely holding and transferring a roll of strip material regardless of its shape or size. CONSTITUTION: This device is provided with a head 16 for transporting rolls 2 from a magazine 5 individually and transferring it to an uncoiling station of a wrapping machine 3. This head 16 carries at least three arms 19 extending from its own center in a radial direction and reciprocated to be spread or contracted by a cam connected to the head 16 and by drives 21 and 24. Freely revolving rollers 27 are mounted one to the end of each arm 19 with its axis being in parallel with an axis of the head. In effecting the transfer movement, the head 16 is traversed both parallel with and transversely to its own axis by respectively actuators 31, 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for changing rolls of strip material in machines using strip material.

0002

BACKGROUND OF THE INVENTION Machines such as those described above are generally power-driven machines adapted to operate using a continuous strip of material, and more particularly, machines of the type described above are used to wrap or wrap articles. This is a packaging machine that does packaging.

[0003] In the field of packaging machinery, for example, as shown in US Pat. Devices for supplying and changing rolls of strip material are known, in which the rolls are removed one by one from this position by corresponding transport means and fed to an unwinding table.

[0004] This transfer means consists of an arm provided with a cylindrical element or shank which can be slidably inserted in the axial direction into the core or central hole of the roll, which roll is arranged at the frontmost side of the magazine. The actuator also causes a first position in which the cylindrical shaft is arranged coaxially with the axis of the magazine, and a first position in which the cylindrical shaft is coaxial with an element carried by the unwinding platform and serving to support the roll. It is possible to move between the second position and the second position.

[0005] Apparatus of the above type suffers from certain drawbacks caused by the difficulties encountered when the cylindrical shaft is inserted into the core of the roll. In fact, the core of the roll can become distorted or the roll itself is not perfectly cylindrical or of incorrect proportions, causing it to be out of axial alignment with the magazine.

[0006]

SUMMARY OF THE INVENTION It is an object of the invention to provide a device for taking rolls of strip material from a magazine and transporting these rolls to a position of use without the drawbacks that occur in prior art embodiments, i.e. the shape and size of the rolls. It is an object of the present invention to provide a device that can securely grip a roll regardless of the roll.

[0007]

SUMMARY OF THE INVENTION According to the invention, the above object is a device for changing rolls of strip material in a machine using rolls of strip material, the rolls being engaged individually and sequentially. An apparatus for changing rolls of strip material comprising a head provided with gripping means for removing rolls from the magazine and transporting these rolls to a rewinding station provided in the machine, the gripping means being located substantially away from the axis of the head. a plurality of radially extending arms; freely rotating roller means mounted on said arms with axes parallel to the axis of said head and adapted to engage the outermost surface of one of the rolls; and drive means for reciprocating said arm along its own axis, said head being moved in a direction parallel to its own axis by a first actuator means and driven by a second actuator means. This is achieved by means of a roll changing device, which is characterized in that it is adapted to be moved transversely to its own axis.

[0008] In one preferred embodiment of the apparatus embodied as described above, the transfer head is further arranged such that the empty cores of each completely used roll of material are automatically removed from the relevant section of the machine. has a device that is removed at
Bolt means are advantageously provided which abut against the outer surface of the core and are carried by each arm of the gripping means and are adapted to be reciprocated therewith by a drive.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will now be described in detail by way of example with reference to the accompanying drawings, in which: FIG. Referring to FIG. 1 of the drawings, 1 shows in its entirety a device for changing rolls 2 of strip material used by a manufacturing machine 3, which device 1 itself forms an integral part of the manufacturing machine 3. do. The device 1 is mounted on a fixed frame 4 of a machine 3 and comprises a plurality of exchange rolls 2 (only one roll 1) is provided with a magazine 5 adapted to accommodate a magazine (as seen in FIG. 1).

[0010] Roll 2 is, for example, an Italian patent application no.
Devices of the type described in No. 46/A/908
(not shown in detail) towards the transfer station 6.

9 is a transfer device comprising an arm 9' rigidly connected at one end (the uppermost end as seen in FIG. 1) to a pivot 10 whose axis lies substantially parallel to the axis of the roll 2; The pivot 10 is slidably and rotatably suspended from a bracket 11 which is rigidly connected to the frame 4 (see also FIG. 3).

The pivot 10 has a splined portion 12 to which one end (lower end as seen in FIG. 3) of the crank 13 is slidably mounted, and the other end of the crank 13 is mounted to the frame 4. It is attached to the rod of the linear actuator 15.

16 is an arm 9' remote from the pivot 10;
It shows a head which is rigidly connected to the end of the head and is provided with a substantially cylindrical hollow boss 17 by means of which the roll 2 is removed and transported. The head 16 also includes three radial sleeves 18 emanating from the cylindrical outer surface of the hollow boss 17, these sleeves 18 being located substantially in a common plane and equally angularly spaced from each other, each with a Contains coaxially disposed and slidable arms 19, one end of which is guided through a respective hole 20 provided by hollow boss 17 and sleeve 18 and into a hole in hollow boss 17. It has become. Arm 19 therefore forms part of head 16 . The ends of the arms 19 located inside the hollow boss 17 carry respective cam follower rollers 21 which are freely rotating and arranged with an axis parallel to the axis of the hollow boss 17 . They engage respective grooves 22 provided by circular plates 23 which are rotatably mounted coaxially in the holes and constitute cam means.

This shows a linear actuator mounted on arm 9', the rod 25 of which is fixed to plate 23 at an offset point such that plate 23 can rotate in either direction.

As will become clear in sequence below, the cam follower 21, the groove 22, the cam plate 23, and the actuator 2
4 together constitute a driving means, and the arm 19 is reciprocated with respect to the sleeve 18 by this driving means.

The end of the arm 19 remote from the boss 17 provides support by means of a corresponding pivot 26, which supports are arranged with an axis parallel to the axis of the roll 2;
It has freely rotatable rollers 27 projecting towards the magazine 5; in a preferred embodiment these rollers 2
7 faces an elastic material (not shown).

As shown in FIG. 3, the right end of the pivot 10 provides an annular seat 28 which serves to receive the bottom end of the link member 29, and the top end of the link member 29 is attached to the pivot 10.
The frame 4 is fixed to a rod 30 arranged parallel to the frame 4.
It forms part of a linear actuator 31 which is rigidly connected to and serves to impart reciprocating motion to the pivot 10 along its own axis.

32 designates another pivot located parallel to the pivot 10 of the transfer device and spaced from the pivot 10 by a distance equal to the distance separating the pivot 10 from the axis of the head 16, when the roll 2 is used. It is attached to the frame 4 at a station 33 corresponding to the position where it is to be rewound, ie to be rewound by the machine 3.

In operation, as the roll 2 is gradually unwound and consumed by the machine 3, the arm 9'
The rollers 27 are positioned so that they are in full contact with the circumferential surface of the roll 2 occupying the transfer station 6.

As the rolls in the unwinding station 33 approach being used up, the pivot shaft 10 is moved axially by the associated actuator 31 so that the roll 2 gripped by the head 16 moves closer to the roll loaded in the magazine 5. becomes separated from the body of the

The initially mentioned linear actuator 15 now acts to rotate the arm 9' about the axis of the pivot 10 so that the new roll 2 is brought into a position coaxial with the unwinding pivot 32; Roll 2 from here
The empty core 34 is removed by hand or by automatic equipment 35 as described step by step with reference to FIGS. 4, 5 and 6.

At this time, the axis 10 is connected to the associated actuator 3.
1 in the axial direction opposite to the previous direction of movement, causing the new roll 2 to slide onto the unwinding axis 32.

When this action is performed, the cam plate 23
is rotated counterclockwise by the corresponding linear actuator 24 (
1 and 2) so that the arm 19 is retracted from the hollow boss 17, pulling the roller 27 away from the surface of the roll 2, and then the arm 9' is returned to the transfer station 6 by the associated actuators 31 and 15. It will be done.

The rolls 2 accommodated in the magazine 5 are indexed in batches via a step by the feeding means 8 so that a new roll 2 can be brought to the transfer station 6 .

Finally, the pivot 10 has an associated actuator 31
towards the transfer station, applying the head 16 to this new roll 2 so as to position the roller 27 above the outer cylindrical surface of the roll 2, and then the cam plate 23 being rotated by the associated actuator 24, the roller 27 is moved into contact with the roll 2 so as to return the device 1 to the starting position of cycle formation.

From the above, it can be seen that the freely rotating roller 2
It will be seen that 7 constitutes gripping means such that a secure hold is obtained on each roll 2, irrespective of imperfections in the shape or size of each roll itself.

Similarly, this gripping means can be completely attached to the circumferential surface of the roll 2, allowing the roll 2 to rotate about its own axis, and this rotation also causes the arm 1 to rotate around its own axis.
It will be appreciated that the adoption of a freely rotating roller 27 at the end of 9 provides accuracy.

It goes without saying that the number of radial arms 19 and corresponding rollers 27 described and illustrated only represents one possible embodiment of the device, and the actual number in implementation may vary. It is.

The embodiment of the invention shown in FIGS. 4 to 6 likewise concerns a transfer device 36, except that this transfer device 36 is equipped with a device 35 for automatically removing empty roll cores 34. This is different from the device 9 described above. To this end, the sleeve 18 of the first device 9 is replaced in the second device 36 by a respective frame 37 of substantially rectangular shape, the frame 37 being connected to an inner wall 38 which is rigidly connected to the outer periphery of the hollow boss 17. two side walls 39 extending substantially radially outward relative to the hollow boss 17 from opposite side edges of the hollow boss 17, and an outer wall 40 parallel to the inner wall 38, the outermost surface of the outer wall 40 comprising: It has an attachment 41 extending parallel to the corresponding roller 27 and terminating at its end furthest from the frame in a flat surface 42 located at right angles to the axis of the roller 27. Each frame is provided with through holes 43 and 44, each provided by an inner wall 38 on the one hand and an outer wall 40 and an attachment 41 on the other hand and slidably accommodating a corresponding arm 19 arranged coaxially with respect to each other. There is.

As can be seen more clearly from FIGS. 5 and 6,
The two side walls 39 of the frame 37 combine to form a groove 45 arranged radially with respect to the hollow boss 17 and surrounded by the inner wall 38 on the one hand and the outer wall 40 on the other hand.

The groove 45 is laterally slidably engaged with a guide means comprising a cylindrical housing 46 .
has a radially arranged through hole 47 located coaxially between the through holes 43 and 44 of the frame and occupied by the arm 19; more precisely, the housing 46 is rigidly connected to the arm 19 and This allows it to move along the groove 45 in a direction perpendicular to its own axis.

The housing 46 is mounted on the associated arm in such a way that its axis is arranged parallel to the corresponding roller 27 and has an axial passage of rectangular cross section which freely engages the sliding means consisting of a rod 49 of rectangular cross section. having a hole 48 and a rod 4
A first end of 9 emerges and extends from the housing 46 to support a tubular guide located on the side of the arm 19 occupied by the roller 27 and arranged parallel to the arm 19 . Each tubular guide 50 provides a support for a spring-loaded bolt 51 arranged radially with respect to the hollow boss 17, these bolts 51 thus being a gripping means characteristic of the operation of the removal device 35. Configure.

Each bolt 51 has a shaft 52 with a tip 53 attached to the end closest to the boss and a guide 50.
The stop ring 55 , which is slidably carried by and biased by a spring 54 mounted between the tip 53 and the radially innermost end of the tubular guide 50 and is coupled to the other end of the shaft 52 , guides the guide 50 . so that it aligns with the radially outermost edge of the

As can be seen in FIGS. 4 and 6, the end of the rectangular cross-section rod 49 remote from the end connected with the tubular guide 50 has an axial groove 56 in which a spring 57 is accommodated.
The spring 57 has a bolt 5 on the one hand.
1 and the other end of the groove 56 closest to the housing 4
6 and a pin 58 inserted laterally.

Therefore, the rod 49 is connected to the housing 46
Internally, the attachment 41 is tensioned by a spring 57.
a retracted rest position (solid line in FIG. 4) in which the end surface 42 of and the lateral surface of each tubular guide 50 are in flush contact with one side of the roll 2 gripped between the rollers 27; The tip 53 can slide axially between the actuating position (phantom line in FIG. 4) and the empty core 34 when there is no roll 2 of material in the space surrounded by the rollers 27. They are arranged so that they face each other in the same direction.

In operation, the empty core 3 from the unwinding axis 32
4 is accomplished by extending the arm 19, moving the head 16 towards the pivot 32 until it reaches the unwinding position 33, and then retracting the arm 19 radially inward. Thus, with the roll 2 occupying the exhausted unwinding axis 32, the bolt 51 can be moved into its extended working position and, by radial contraction of the arm 19, brought into engagement with the core 34. be made into

Thereafter, the head 16 is moved to the rewinding station 33.
With the empty core 34 of the spent roll, the pivot 32 can be left free for loading with a new roll 2, as already mentioned.

[Brief explanation of the drawing]

1 is a schematic front view of a first embodiment of the device according to the invention; FIG.

FIG. 2 is an enlarged view of a detail from FIG. 1;

3 is a side view of the detail of FIG. 2; FIG.

4 is a view similar to FIG. 3 of a second preferred embodiment of the device according to the invention; FIG.

FIG. 5 is a front view of the detail of FIG. 4;

FIG. 6 is an enlarged perspective view of the detail of FIGS. 4 and 5;

[Explanation of symbols]

1...Roll changing device 2...Roll 3...Manufacturing machinery 5...Magazine 15...Linear actuator 16...Head 19...Arm 21... Follower roller 22...Groove 23...Circular plate 24...Linear actuator 27... Laura 31...Linear actuator 33... Rewind department 34...Core 35...Automatic device 46...Cylindrical housing 49...Rod 51...Bolt 52...Shaft 57...Spring

Claims (7)

[Claims] 1. A device for changing rolls of strip material in a machine using strip material, comprising a head (16) provided with gripping means, by means of which the rolls (2) are individually successively replaced. engaged with
Then take out the individual rolls and machine these rolls (3)
a station (33) where the strip material is unwound;
), in the changing device of the strip roll to be transferred,
the gripping means being mounted on the arm so as to have a plurality of arms (19) extending substantially radially from the axis of the head and having an axis parallel to the axis of the head;
rotatable roller means (27) adapted to engage the outermost surface of two rolls (2); drive means (21,
22, 23, 24), the head comprising:
A strip material characterized in that it is moved by a first actuator means (31) in a direction parallel to its own axis and by a second actuator means (15) in a direction transverse to its own axis. Roll changing device. 2. Device according to claim 1, characterized in that the arms (19) of the gripping means are spaced apart from each other by equal angular distances. [Claim 3] Driving means (21, 22, 23,
24) comprising cam means (23) and cam follower means (21) cooperating with a corresponding part of each arm (19) and engaging the cam means (23). The device described. 4. The head 16 further comprises a device (35) serving to remove the core (34) of the completely exhausted roll (2) of material from the unwinding station (33) of the machine.
).) Apparatus according to one of the preceding claims. [Claim 5] The core removal device (35) removes the core (
34), said bolt means being carried by each arm (19) of the gripping means and together with the drive means (21, 22, 23, 24); 5. The device of claim 4, wherein the device is reciprocated by. 6. A guide means (46) attached to each arm (19) and arranged parallel to the axis of the head, cooperating with and with respect to the guide means (46) and arranged parallel to the axis of the head. Sliding means that can move in parallel directions (
49) and spring means (57) disposed between the guide means (46) and the associated sliding means (49), the bolt means (51) being arranged on the sliding means (49). 6. The head according to claim 5, which is connected and movable together with the sliding means (49) parallel to the axis of the head (16) via spring means (57) between a retracted rest position and an extended working position. Device. 7. Bolt means (51) carried by each arm (19) of the gripping means are disposed parallel to the arms and slidably coupled to a corresponding sliding means (49), with respect to the sliding means. The head (
a shaft (52) movable towards the axis of the shaft (52);
).) The apparatus according to claim 6.