JPH07223732A - Roll-form product storage system, gripper and roll core to be used for said system - Google Patents

Abstract

PURPOSE: To store printed products in rolled state by holding both stacked printed product rolls and a plurality of empty rolls from the upper side and transporting and loading them. CONSTITUTION: When the maximum number of rolls W are held, with a star type gripper arm 20 positioned at upper stoppers 11 and 1, a gripper is moved and lowered to a corresponding storage position by transporting means. When the roll W passes through a sensitive area of a sensor S1, a lowering operation is decelerated. A center member 10 is seated on the roll W on which the star type gripper arm 20 is stacked, enters slowly into a roll core until it touches the lower stoppers 11 and 2, and stopped by the signals from an end sensor S2. When a clamp mechanism 30 performs a clamping operation and a corresponding sensor emits the signals indicating that a roll drive mechanism 50 is put at a corresponding position, the gripper rises first at a low speed and then with gradually increased speeds until the sensor S2 senses a clearance between the star type gripper arm 20 and lower stoppers 11 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage system in the technical field of storage systems, and more particularly to a storage system for storing roll-shaped products, particularly roll-shaped printed products, and grippers and roll cores which are parts thereof.

[0002]

2. Description of the Related Art When a printed product is manufactured, the processing speed or procedure of one process is often different from the processing speed or procedure of the next step. It often has to be relocated. It is a well-known fact that printed products are originally fed from the outside while being fed and processed while being fed, so that they are stored in the form of a rod, that is, in a roll state, when they are stored intermediately. The storage in the roll state has advantages such as being able to hold the unwinding form, stacking the rolls, not requiring a storage auxiliary device other than the roll core and the hub, and being able to perform the unwinding and winding operation completely automatically.

During intermediate storage and relocation, the printed product delivered from a process is wound onto a roll core or hub and stored as a roll. When needed, rolls are removed from storage and unwound. A roll core with an integrated band is used for winding, is stored in a storage together with the roll, and is opened by unwinding. After being unrolled by unwinding, the empty rolls need to be stored intermediately before being used again by rewinding.

The Swiss patent application No. 888/91 by the applicant of the present invention describes a method of intermediate storage and rearrangement of printed products in a pay-out format. This method seems to be known, but in order to make optimal use of the storage space, both the printed product roll and the empty roll with substantially the same dimensions can be combined into a storage unit and exchanged with each other. It can be stored in various storage locations. In order to make optimal use of the handling means and the transport path, the roll core path is completely integrated with the storage of the printed product, for example the product roll and the empty roll core are treated the same and The same means are used whenever possible. In the integrated storage method for a roll of printed products as described above, the roll core and the handling means must be accurately aligned with each other.

A suitable storage device for printed product rolls is, for example, a pair of horizontal rolls, a suitable storage device for empty roll cores is a plurality of cylinders with several superposed roll cores, which are loose. The rosettes are arranged side by side along the circumference and form, for example, a rosette with 6 × 3 roll cores. These storage devices are sequentially stacked in pallets or frames and do not require any other storage means.

[0006] For storage or removal from storage, ie holding, transporting and placing horizontal rolls (individually or as a storage unit) and empty roll cores or hubs (individually or as a storage unit). If you do
The resulting problem is to create a storage means that can go through the four working steps described below.

First, one or more horizontal rolls are gripped or placed in an intermediate storage location and placed or removed horizontally in the corresponding device, and in the storehouse on top of the stacked horizontal rolls or This is a process of placing the product on a floor in a horizontal roll piled up high in the surroundings. Next is the step of transporting one or more horizontal rolls between the storage and the intermediate storage location. Then a step of gripping one roll core rosette or part thereof and placing it in an intermediate storage location and setting or further processing by a suitable device, i.e. on horizontal rolls or roll core rosettes stacked in storage, or they Is a step of placing it on the floor in a state that it can be piled up to the surroundings. And the process of transporting the roll core rosettes or individual roll cores between the intermediate storage location and the storage.

In addition to the roll core, the storage requires a minimum device for loading and unloading the storage. These means must be controllable by the central controller, and the central controller must not require reconfiguration to handle the roll or roll core.

[0009]

The above problems can be solved by the storage system and the parts thereof, the gripper and the roll core, which are described in the claims.

[0010]

SUMMARY OF THE INVENTION A storage system according to the present invention includes at least one storage device with a gripper and a plurality of substantially hollow cylindrical roll cores. The maximum possible printed product roll diameter D and the empty roll core diameter d will be such that when some empty roll cores are arranged substantially circumferentially their outer shape is less than or equal to the roll diameter D. It is designed as follows (see Fig. 1). The cylinder height l of the roll core is designed to be equal to or less than the horizontal roll height L in any case, and the width corresponds to the printed product to be wound (see FIG. 2). As a method of winding the printed product, the roll core is located at the center of the width of the printed product to be wound. The roll core is essentially a hollow cylinder provided with gripping means located inside it which can be gripped by the device. The circumferential surface of the roll core has a structure in which several roll cores can be sequentially stacked in a stable manner.

The storage device of the storage system according to the invention essentially comprises a carrier and a gripper arranged thereon for preventing rotation. A carrier or a crane can be used as the carrier. The gripper is essentially a star-shaped structure with six arms, the symmetry of which is adapted to the same circumferential shape as the symmetry of rolls stacked side-by-side in close proximity, which arms are gripped. The rolls extend out of the contour of the rolls and are movable between the stacked rolls. The gripper has a structure that clamps it on the arm so that at least 1
It has the advantage that one roll can be clamped at its outer circumference and that it is provided with an inner circumference roll drive means, whereby the roll core of the clamped roll can be supported. Inside the above-mentioned clamp structure, there is a roll core driving mechanism arranged in a circumferential shape, whereby it is possible to grip and carry individual empty roll cores or stacked roll cores having a substantially circumferential shape. It has become like. The roll core drive mechanism is movably arranged along the gripper arm or the intermediate arm so that it can be moved from the vicinity of the roll when handling the product roll.

The carrier and the gripper are designed to carry out a storage operation in which the gripper grips or rests from above the horizontal roll. However, the gripper must be used in combination with a carrier that rotates the gripped roll or rolls from a horizontal position to a vertical position. Such a device can also be used for changing rolls on the winding section or the corresponding roll changing frame.

[0013]

Embodiments of the storage system according to the present invention and its components, the gripper and the roll core, will be described in more detail below with reference to the drawings.

FIG. 1 is a plan view showing the details of the storage cabinet.
The roll W and the roll core rosette R are juxtaposed side by side, and can be introduced and taken out from the upper portion by a storage device equipped with a gripper G. The roll W and the roll core rosette R are stored together, and the roll W and the roll core rosette R can be freely exchanged so that the storage space can be optimally used. The above two conditions result in a high density and circumferential storage location and in each case have a maximum roll diameter D. In order to achieve optimum use, the stored rolls usually have a maximum diameter D. Rolls with smaller diameters can of course be stored, but care should be taken with regard to storage stability. Due to the very dense arrangement as described above, it is located between other rolls etc.
Roll with contact points and hexagonal star free space F
(Longitudinal linear region) is configured. If the gripper grips a roll that is stored in close proximity from its periphery as described above, it must grip in six substantially triangular spaces around the roll. That is, the gripper must basically project at the top of the roll with a maximum of 6 triangular spaces. Therefore, the gripper G consists of six star-shaped or cobweb-shaped gripper arms (for example, in the shaded area) or 60 degrees, 1
It will have gripper arms with angular intervals of 20 or 180 degrees. The preferred form of the star gripper arm is 6 arms with 60 degree angular spacing, 60 degree and 120 degree.
It has four arms with an angular spacing of 4 degrees and three arms with an angular spacing of 120 degrees. Two arms with an angular interval of 180 degrees are of course conceivable, but when handling heavy rolls the gripped roll is not sufficiently stable.
This is because the jaw width of the clamp is limited by the size of the triangular free space.

The storage device and the gripper for guiding the gripper from one storage location to another storage location are such that the free space of each storage is arranged in the same form so that the rotation position of the gripper with respect to the storage location does not change. Of course, you have to do it. This has an invariable positional relationship and can be easily achieved by means of a carrier mounted so as to prevent rotation of the gripper. The carrier is suitably constituted by a storage carrier guided on rails and is movable at right angles to the rails or, as shown in FIG. 1, for example movable in the y direction and in the X direction. A mobile crane having a running support member and a rail 2 fixed to the support member so as to prevent the gripper G from rotating can be operated in a fully loaded storage.

FIG. 2 is a sectional view parallel to the rotation axis showing an example of the gripper according to the storage system of the present invention, and the gripper roll W (half of the rolls is shown) on the right side.
The clamp mechanism 30 is shown, and the core drive mechanism 40 for the gripping roll core WK is shown on the left side. The gripper basically comprises a central member 10 and said star-shaped or cobweb-shaped gripper arm 20. The star-shaped gripper arm 20 has a certain limit, for example, two stoppers provided on the central member 10.
It is preferably constructed such that it is axially movable between 11.1 and 11.2. The central member 10 has fixing means 12 for fixing the gripper to the carrying means and connecting it to the power means, so that the operation and control inspection of the gripper parts can be carried out.

The star-shaped gripper arm 20 has a gripper arm 21 extending to the outer circumference of the gripped roll, the structure of which has already been described with reference to FIG. There is a clamp mechanism 30 at the tip of the gripper arm and a core drive mechanism 40 can be provided, but the core drive mechanism 40 is provided in an intermediate arm between the gripper arms.

The clamping mechanism 30 is driven, for example, by a suitable drive not shown provided on each gripper arm 21, but between a radius slightly larger than the largest possible roll and a radius slightly larger than the smallest possible roll. Can move in the radial direction (direction of arrow R in FIG. 2). The drive unit used for this operation applies pressure to the gripped roll to securely grip the roll. Each clamp mechanism
30 has at least one machined clamping jaw. If the gripper grips several stacked rolls, it is desirable to deploy a corresponding number of jaws on the clamping mechanism 30. A clamping mechanism for two stacked rolls will be described below with reference to FIGS. 3 and 4, but with the use of a tilting device, the clamping jaws will have two rolls with different diameters within a range. They are connected to each other so that they can be held.

A roll drive mechanism 50 can be provided on the central member 10, the lower part of which is located inside the gripped roll to stabilize it. The above arrangement works in conjunction with the retaining means 60 inside the core which slightly reduces the inner diameter of the roll core. The roll driving mechanism 50 changes the substantial outer shape of the central member 10 as shown by an arrow Q in FIG. 2 by a driving device (not shown) and is inserted into the inside of the roll core so that the roll driving mechanism 50 does not come out after the corresponding operation Q. Like When gripping several rolls at the same time, the roll drive mechanism 50 for each roll is preferably located at a corresponding height of the central member 10. Since the gripper arm is located at such a height, the roll driving mechanism enters below the holding means 60 of the corresponding roll core WK with the gripper arm at the position of the lower stopper 11.2, and the roll weight is passed through the holding means. Support a part of.

The core driving means 40 operates in association with the roll core holding means 60, and can be moved in the same manner as the roll driving mechanism 50 of the central member by the corresponding driving device (not shown) as shown by the arrow S in FIG. Since the roll core WK is much lighter than the product roll, even if several roll cores are gripped, it is sufficient to grip the lowermost roll core by the roll core driving means. In order to keep the roll cores in a stacked state with sufficient stability, the circumferential surface is constructed in a structure suitable for stable stacking, for example, in a staircase shape or an inclined surface shape.

The roll core drive mechanism 40 is arranged so that it cannot be in that position when handling the product roll, so that it can be moved out of the roll area by another drive device, not shown. Therefore, the lead drive mechanism 40
For example, the star gripper arm 20 can be swung back or folded as shown by an arrow T in FIG. 2, or can be moved upward. When the core drive mechanism 40 swings, the central member 10 is prevented from projecting too much above the star-shaped gripper arm 20 while swinging downward.
The core drive mechanism 40 can be extended and shortened as shown by an arrow H in FIG. 2 for a core cylinder longer than the number of product rolls to be gripped so that it does not extend further downward, and when it does not operate (from the roll area). It is desirable not to extend below the central member 10 (when the roll core is not conveyed without retracting). The central member can be equipped with sensors that control any downward movement of the gripper. The roll core driving mechanism 40 can be shortened by a separate driving device (not shown) or a driving device for the movement S.

The roll core drive means and the product roll drive means need not cooperate with corresponding holding means inside the core. They can, of course, be constructed in the form of jaws and the drive can apply pressure to the inner surface of the core. The alternative form of holding means is obvious, since the roll core is fixed to the winding part and the roll changer with the aid of such internal holding means.

The various drives required to operate the gripper components are preferably pneumatic or hydraulic linear cylinder drives. Sensors are required to control or inspect motion, the functions of which are described below, but commercially available end sensors, range sensors, and pressure sensors (depending on function) can be used.

The gripper functions as follows. For gripping the maximum number of rolls, with the star-shaped gripper arm 20 positioned on the lower stopper 11.2, the gripper suspended by the carrier is moved by the carrier to the corresponding storage position and lowered. To do. Clamp mechanism
30 is at the outermost position (position shown by a chain line in FIG. 2), and the core drive mechanism 40 is not located near the gripped roll (shown by a chain line in FIG. 2, for example, swings and retracts). Position), the roll core drive mechanism 50 is in a position where the diameter of the central member can be introduced into the roll core (the position shown by the chain line in FIG. 2). Sensor S1 whose roll is shown in the form of a beam
Immediately after passing through the sensing area of, the descending motion slows down. The central member 10 rests on the roll on which the star gripper arms 20 are stacked and slowly enters the roll core until it hits the upper stopper 11.1. The descending operation is stopped by the signal from the end sensor S2 installed near the upper stopper. Thus, the clamping mechanism 30 moves inward until it hits one or more rolls W. The roll driving mechanism 50 swings and projects. The operation of the components concerned here is preferably monitored by corresponding sensors. When the clamp mechanism 30 performs the clamping operation and the corresponding sensor emits a signal indicating that the roll drive mechanism 50 has been placed at the corresponding position, the gripper detects that the sensor S2 causes the gap between the star-shaped gripper arm 20 and the upper stopper 11.2. Slowly until it senses, then increase in speed and rise.

When gripping a smaller number of rolls than the maximum number, the function until the central member 10 reaches the inside of the roll core is as described above. However, the central member does not move into the roll (according to the signal of sensor S2) until the star-shaped gripper arm 20 reaches above the stacked rolls,
Instead, the sensor S7 located below the central member 10 (compare FIG. 3) moves when it enters the roll core. The descending motion will stop, and the clamping motion will start.

When placing one or more rolls, the grippers holding the rolls move above the corresponding storage locations and descend until sensor S1 senses the stacked rolls or floor. The descending motion is decelerated to place the roll on the predetermined position, and the star-shaped gripper arm 20 moves to the upper stopper 11.1 (signal of the sensor S2) and stops. Clamp mechanism 30 moves to the outside and roll drive mechanism
50 swings and is inserted inward, and the gripper rises again slowly and gradually until the placed roll leaves the sensing area of the sensor S1.

When gripping the maximum number of stacked roll cores, the gripper is moved by the transport means to the position above the corresponding storage location and lowered. The clamp mechanism 30 is at the outermost position, the roll drive mechanism 50 is at the inner side, and the roll core drive mechanism 40 descends from the star gripper arm 20.
Does not extend or widen. When the sensor S1 detects the presence of the roll core, the lowering operation is slowed down, and when the star gripper arm 20 rides on the roll core (signal of the sensor S2), the lowering operation is stopped. The roll core drive mechanism 40 extends downward and extends until it becomes the longest. When the corresponding sensor senses its position (indicated by the solid line in FIG. 2), the gripper will slowly rise again until the star-shaped gripper arm 20 moves away from the upper stop 11.1 and then rise at normal speed.

When lifting a small number of roll cores, a number of roll cores less than the maximum number of stacked roll cores is:
It is lifted in the same motion as for the rolls described above, i.e. with the sensor mounted at the corresponding height of the central member 10 and stopping the lowering motion. You must prepare the required number of sensors. The sensor is, of course, provided in the roll core drive mechanism 40 and can perform the same function. The roll core drive mechanism 40 must be in the longest stretch but not widen during the lowering movement of the gripper. By widening the roll core drive mechanism 40 and then reducing it after transport, any number of roll cores can be sandwiched and transported between the star gripper arm 20 and the means for widening the roll core drive mechanism 40.

In order to mount the roll core, it suffices to have a function opposite to that at the time of lifting. The sensor S1 has different functions and is designed in a suitable form. The corresponding signals are stacked rolls, roll cores,
Alternatively, it is used to slow down the lowering motion of the gripper as the substrate enters its sensing range. The signal is also used to accelerate the object to normal speed when it leaves the sensing range. If the empty gripper malfunctions and descends to the floor, the sensor issues an emergency stop signal and the gripper stops on the substrate. For safety, it is desirable to use a pressure sensor S4 to monitor the air pressure or hydraulic pressure operating near the corresponding connection.

3 and 4 are detailed views showing another embodiment of the gripper according to the present invention, the cross section of which is shown in FIG.
(FIG. 3) and a plan view (FIG. 4). The gripper can hold a pair of horizontal rolls or a single roll,
The diameter of the pair of rolls can vary within a range. The gripper can also hold 6 x 3 stacked roll core rosettes. The function of the gripper is essentially the same as the general gripper function already described with reference to the previous figures. Parts of the gripper having the same functions as those described above are designated by the same reference numerals.

The gripper essentially comprises a central member 10 and a star-shaped gripper arm 20 having on its axis six arms adapted to be movable between an upper stopper 11.1 and a lower stopper 11.2. The position of the star gripper arm 20 relative to the member 10 is monitored by the sensor S2 near the lower stopper 11.2.

A clamp mechanism 30 is attached to each gripper arm 21.
Is installed, which is operated by the linear drive Z2. The drive Z2 is depicted in the fully inserted position, which corresponds to the outermost position of the clamping mechanism 30. Clamp jaws 31.1 and 31.2 are locking levers 32.1 and 32.2
And 33.1, 33.2 and the pivot pins A, B, C, D, E, F are rotatably supported by the slide lever 34.
When gripping rolls of different diameters, the rolls can be rotated from their longitudinal positions (shown by the solid line in FIG. 3) to the rotated position (shown by the chain line in FIG. 3). Has become. The position of the slide lever 34 is determined by the sensor at the end operatively connected to the drive Z2.
Monitored by S9.

The roll drive mechanism 50 essentially comprises 2 × 3 drive flaps 51.1 and 51.2 which oscillate when the rollers 53.1 and 53.2 operatively connected to the drive Z1 are raised. It has moving templates 52.1 and 52.2 that move back and forth. When the rollers 53.1 and 53.2 retract,
The drive flaps 51.1 and 51.2 do not stop at the position further swung back, but return to the inner position by the holding means 60 of the roll core WK while the central member 10 rises. In order to prevent the above-mentioned return from being regularly jerky, the roll core holding means 60 has a cylindrical shape with its tip cut off coaxially with the roll core cylinder and having a tapered surface 61.
It is desirable to configure so that. In order to allow the roll core to be gripped regardless of its original position, the holding means is arranged at the center of the hollow cylinder, and the opposite surface 61
And 61 'are preferably provided on the retaining means. The retaining means can be formed around the inner surface of the hollow cylinder without interruption or in an interrupted state.

The drive flaps 51.1 and 51.2 are sensors S5.1, S
It is monitored by 5.2 and S10.1, S10.2. The sensors S1 and S7 having the above functions are of course arranged on the central member 10.

The roll core drive mechanism 40 is fixed to an intermediate arm 22 located between the gripper arms 21 of the star-shaped gripper arm 20. 3 and 4 are four of the six states of the roll core driving mechanism 40, that is,
When handling the roll, it is in the fully extended and widened state shown in FIG. 3, 40.1 in FIG. 4 and 40.2 in FIG. 4, 40.3 in FIG. 3 not extended and not widened in the upper position, and the folded state. It shows 4 ways of 40.4.

The roll core drive mechanism 40 has a drive unit Z3, which is located inside the intermediate arm 22 and is extended in a state where the drive unit Z3 is extended (4 in FIG. 4).
The roll core driving device 41 is rotated about the axis J so as to be parallel to 0.4), and the driving device is directed downward with the driving device contracted (40.1, 40.2, 40.3 in FIG. 4). The roll core driving device 41 is essentially a telescope-like telescopic tube 43,
For example, a widening drive 44 with three extension legs and drive Z4
Although the drive device Z4 is extended, the expansion tube 43 is expanded to expand the expansion device 44, and the expansion device is folded in the contracted state to contract the expansion tube. If you retract the telescopic tube,
The widening device is first folded by the weight of the roll core and then the telescopic cylinder is contracted. The position of the roll drive is monitored by sensors S8, S12, S6 and S11.

FIG. 5 shows the function of the gripper shown in FIGS. Vertical frames I to V show different actions (I holds two rolls, II holds one roll, III holds the roll, and IV holds the roll core rosette. Then, V mounts the roll core rosette). At the bottom, the operating modes of crane K, high speed, low speed and stop, are shown. V indicates a value for controlling the driving device. For safety reasons, it has the value of immediately locking drives Z1, Z2, Z4 in place in the event of a power failure.

[0038]

The roll-shaped product storage system of the present invention comprises:
It is optimal for gripping, transporting and placing a plurality of roll-shaped products and a plurality of empty rolls.

The gripper of the present invention is most suitable for gripping, transporting and placing a roll-shaped product and an empty roll.

The roll core of the present invention can be securely held by the gripper.

[Brief description of drawings]

FIG. 1 is a detailed plan view showing an example of a storage cabinet according to a storage system of the present invention.

FIG. 2 is a cross-sectional view parallel to the rotation axis showing an example of a gripper according to the storage system of the present invention, showing a roll core and a roll (partially) associated with the gripper.

FIG. 3 is a detailed sectional view of FIG. 2 using another example of the gripper according to the storage system of the present invention.

FIG. 4 is a plan view showing details of the gripper shown in FIG.

5 is an operation explanatory view of the gripper shown in FIGS. 3 and 4. FIG.

[Explanation of symbols]

 10 Central member 20 Gripper arm 21 Gripper arm 30 Clamping mechanism 31.1 Clamping jaw 31.2 Clamping jaw 40 Roll core drive mechanism 44 Widening drive device 50 Roll drive device W Roll WK Empty roll core

Claims (17)

[Claims] 1. A plurality of stacked print product rolls comprising at least one storage device with a gripper and a plurality of roll cores, the gripper of the storage device being defined as one storage unit, and another. A roll-shaped product storage system for storing printed products in a roll shape, characterized in that both of a plurality of empty rolls having a certain form defined as a storage unit are grasped, conveyed, and placed from above. 2. A printed product roll storage unit is a pair of horizontal rolls, and in each case the roll core storage unit is a circular cylinder having three loosely stacked roll cores gently juxtaposed. Arrangement, wherein the maximum possible diameter of each roll is larger than the outer diameter of the roll core storage unit. 3. A roll product storage system according to claim 1 or 2, characterized in that the storage device is designed in such a way that, in operation, the gripper has a defined rotational position adapted to the roll storage. 4. The storage system according to claim 1, wherein the gripper has a structure capable of gripping, carrying, and mounting a part of a plurality of storage units. 5. A star-shaped or cobweb-shaped gripper arm 21 on the central member 10, a clamp mechanism 30 capable of gripping a print product roll by clamping it from its peripheral portion, and a clamp mechanism 30 Roll core drive mechanism located at
40, characterized in that the roll core drive mechanism is capable of gripping an individual roll core or a plurality of stacked roll cores therein, and is movable outside the roll region when handling a product roll. The gripper used for the roll-shaped product storage system according to any one of claims 2 to 4. 6. The gripper according to claim 5, further comprising a roll driving mechanism 50 disposed on the central member 10 and capable of indicating one or a plurality of print product rolls from the inside thereof. 7. Each clamp mechanism 30 has a plurality of clamp jaws 31.1, 31.2 corresponding to the maximum number of rolls that can be carried,
7. The gripper according to claim 5, wherein the clamp jaws can be connected by a lock lever and a pivot pin so that rolls having different diameters can be securely tightened. 8. A roll core drive mechanism 40 is pivotably arranged about a pivot pin J so that it can take a pivot position parallel to the star-shaped gripper arm 20 or at a right angle to the star-shaped gripper arm. Claims 5 to 7 characterized
The gripper according to any one of 1. 9. The gripper according to claim 8, wherein the roll core driving mechanism 40 has a widening driving device 44. 10. The gripper according to claim 9, wherein the roll core drive mechanism has a telescopic cylinder 43 like a telescope. 11. The gripper according to claim 6, wherein the roll driving mechanism 50 has a driving flap provided with a moving template which is swung back and forth by a driven roller. 12. A drive device for each clamp mechanism 30 and each roll drive mechanism 50, and each roll core drive mechanism has a drive device for folding operation and a drive device for extension and widening operation. The gripper according to any one of claims 6 to 11, characterized in that. 13. The gripper according to claim 12, wherein each drive device is a pneumatic or hydraulic linear drive device or an electric servomotor. 14. The gripper according to claim 5, wherein the positions of the gripper and the gripper parts are monitored by a sensor. 15. A roll core for use in a roll-shaped product storage system according to any one of claims 1 to 3, wherein the roll core is a substantially hollow cylinder and has a holding means therein. 16. The retaining means has at least one machined portion on its inner circumference, the machined portion having two symmetrical surfaces or parts having symmetrical surfaces, the surfaces being tapering in opposite directions. 16. A roll core according to claim 15, characterized in that it forms a conical profile with two similar cutting edges. 17. The roll core according to claim 15, wherein the two circumferential surfaces of the roll core are configured so that several roll cores can be stably stacked.