WO2019121977A1

WO2019121977A1 - Device for loading a sanding tool

Info

Publication number: WO2019121977A1
Application number: PCT/EP2018/085935
Authority: WO
Inventors: Werner Unnerstall; Christian Wall; Christian BURSTEIN; Stephan Kampmeyer
Original assignee: Rud. Starcke Gmbh & Co. Kg
Priority date: 2017-12-20
Filing date: 2018-12-19
Publication date: 2019-06-27
Also published as: EP3727752A1; DE102017130804A1

Abstract

The invention relates to a device for loading a sanding tool with a preferably flexible sanding sheet (11), formed by a table (1) having multiple receptacles (2) in which a respective dispenser (3) accommodating a plurality of stacked sanding sheets (11) is removably arranged, wherein the table (1) can be moved in cycles such that the dispenser (3) moves into the effective range of a plunger device (5) with which a sanding sheet (11) can be brought into a removal position.

Description

Device for loading a grinding tool

The invention relates to a device for loading a grinding tool according to the preamble of claim 1.

For abrading surfaces, abrasive tools, each having a sanding pad and an abrasive sheet attached thereto, are moved in a bital, rotary or vibratory manner.

The attachment of the respective sanding sheet, which is otherwise flexible out forms, is usually carried out by means of a Velcro connection, including the grinding plate on the one hand and the abrasive sheet on the other hand correspond de Velcro layers. The opposite side of the abrasive sheet is coated with an abrasive grain layer for processing the surface of a workpiece.

These abrasive sheets may have a different contour, predominantly they are circular with different circumferential contours, be it as a circle, wavy or other comparable shape.

A change of the abrasive sheet, for example, if this is no longer useful after use, but designed extremely time consuming because sanding sheets manually removed from a package and placed on the sanding pad must be introduced, with a custom-fit edition is mandatory.

In order to be able to deduct these manually better from the grinding plate at a change of the grinding wheel, the grinding wheel is larger in size than the grinding disc, so that an edge overhang is formed.

The manual change of the sanding sheet is also particularly disadvantageous because it requires a precise positioning of the sanding sheet on the sanding pad. A cost-optimized operation of the grinding blade change is therefore clearly contrary.

This circumstance is of particular importance because of equipped with abrasive sheets grinding tools are used in a variety, especially in the professional field, so do not work at home improvement.

For grinding with sanding sheets robots are increasingly being used, with which program-controlled grinding work can be carried out in series. Here too, the previously described problems arise, since an abrasive sheet change also takes place manually.

The invention has for its object to provide a device of the gattungsgemä Shen type, with a faster and smoother change of an abrasive sheet is possible.

This object is achieved by a device having the features of claim 1.

Using the device according to the invention, the placement of a grinding tool with an abrasive sheet is now practically automatic, ie, that the grinding tool is only in the range of a removal opening of the Spen to bring, which can be done manually with a hand-held grinding tool, or by a robot if that Grinding itself takes place by means of the robot whose grinding movements are computer-controlled.

A decrease in a used abrasive sheet can also be done automatically, including a puller may be provided with the ro boter can be brought into correspondence.

According to the invention, the device has a table which may be formed as a sliding or rotary table, each equipped with a plurality, preferably, at the same distance from each other arranged dispensers.

The dispensers are filled with abrasive sheets that lie stacked on each other gene, each abrasive sheet has a connecting and opposite a grinding side. The connection side, in particular as part of a Velcro connection with the sanding pad of the grinding tool, is at the top, facing the removal opening, so that the stacked abrasive sheets each face with their connection side of the removal opening and the grinding side is on the connecting side of the underlying abrasive sheet. The plunger means by which the abrasive sheets are nachgeschoben after removal by the grinding tool until the uppermost abrasive sheet passes into ei ne removal position, has a hydraulic, pneumatic or elekt romotorisch axially movable plunger on the opposite side of the removal opening of the donor to a slide which is stored in the dispenser and on which the stacked abrasive sheets rest.

Said plurality of dispensers, which are positioned on the table, Kings record nen sanding sheets with different grain sizes, being moved to each respective placement of the grinding tool, the table accordingly. Thus, only a plunger device is required to bring different abrasive sheets used.

To stockpile dispensers that are ready-made from the place of manufacture, a magazine may preferably be provided underneath the table, which is designed such that a targeted removal is possible when a new dispenser is needed.

In principle, it is conceivable that, instead of merely a plunger device for loading of donors with abrasive sheets of different grain size, each separate dispensers a separate plunger device is assigned.

On the side facing away from the plunger, the plunger device has a mouth piece with a center opening which is smaller than the corresponding dimension of the abrasive sheet, but larger than the corresponding dimension of the grinding lers, so that it can be inserted through the center opening in the dispenser. When moving out of the sanding plate with the attached abrasive sheet, the Flächenabmaß is therefore greater than the Flächenabmaß of the sanding pad, the abrasive sheet bends accordingly and thus passes out of the donor into the work area.

The dispenser also has opposite a center opening which is penetrated by the plunger.

As supplied, the dispenser, which is in the form of a tubular cartridge, is closed with a lid and a bottom, both with the center Opening provided. To provide or insert into the table, the lid is removed and pushed onto the floor.

The now exposed removal opening of the dispenser is closed by the tenöff having having mouthpiece, which is held by clamping the mouthpiece in correspondence with the table of the dispenser. In order to facilitate centering of the mouthpiece on the dispenser, the mouthpiece in the region of its central opening circumferentially an insertion obliquely and that on the donor side facing.

In order to achieve a secure adhesive bond between the sanding pad and the sanding sheet, the plunger exerts a counter force, is ensured by the same time that is never depressed with the sanding pad, the stack of sanding sheets. The plunger thus forms an abutment.

For optimum hold of the sanding sheet on the sanding pad, it is rotated by a few degrees when a robot is used.

The dispenser is preferably provided with an identification, such as an encoding in the form of a bar code or QR code, so that not only is it detected with a slice arranged in the region of the optical system when a dispenser is emptied, but also what type of grinding sheets, ie, in particular with respect to the grain, are consumed, so that the table can be refilled with a corresponding dispenser. A confusion of grain size and thus a time-consuming and costly rework of the ground workpiece are thus excluded.

In addition, logistic tasks or orders can be carried out via the computer control. Likewise, the consumption of abrasive sheets per work piece, working time or time span can be determined, from which data for an optimization of the grinding work can be derived.

About the detected consumption of abrasive sheets Instandhaltungauf or maintenance measures, such as changing the sanding pad due to wear can be detected in order to make necessary changes in a timely manner.

The filling of the table with dispensers, in particular a replacement filling, can be done automatically with suitable devices. It is conceivable, however also make the assembly manually, the requirement of loading the operator is informed by an optical, acoustic or electrical signal and / or by an electronic message from the computer. Incidentally, the operator has sufficient time to load a plurality of devices.

To protect the device from accumulating sanding dust and thus to ensure sufficient reliability, an enclosure of the device is provided, with an access option for the grinding tool-carrying robot arm is provided.

In the case of manual loading of the table with dispensers, this access area is spatially separated from the work area, whereby here too the device is housed, except for the part of the table which is equipped with dispensers.

The said separation of the setting zone from the working zone can be effected by a protective fence which is provided with doors for access to the working area. To open the doors, the robots and other equipment required for grinding operations are preferably switched off in their function or travel to a basic position. Incidentally, the required units are networked or individually controlled by a higher-level system controller.

Further advantageous embodiments of the invention are characterized in the subclaims.

An embodiment of the invention will be described below with reference to the beigefüg th drawings.

Show it:

Fig. 1 shows a device according to the invention in a perspective

Top view

Fig. 2 shows the device in a perspective bottom view

Fig. 3 is a sectional side view of the device Fig. 4 shows a detail of the device in an enlarged ge cut side view

Fig. 5 integrated in an operating device in a

Top view

Fig. 6 shows a further detail in a sectional side view.

In Figs. 1-3 a device according to the invention is shown, with a designed as a rotary table table 1, the receptacles 2, in which each case a dispenser 3, as shown in Fig. 6 as a detail in a sectional side view is, are arranged removably. In each dispenser 3, a plurality of stacked abrasive sheets 1 1 are deposited, which can be removed via a removal opening of the dispenser 3 by means of a grinding tool.

The device is held on a stationary base plate 7, to which a plunger device 5 is fixed, in which a plunger 9 is held axially movable, to which a compressed air line 6 is connected for the supply of compressed air.

The dispenser 3 are at the same distance from each other on the table 1 positio ned and intermittently fed to the plunger device 5 until the plunger 9 is aligned axially with the respective dispenser 3.

The drive of the table 1 also takes place pneumatically in the example, with a compressed air line 6 is also provided for this purpose, which is in operative connection with a corresponding drive unit. Instead of a rotary table and a sliding table with receptacles 2 may be provided, which also moves the dispenser 3 cyclically to the plunger device 5.

Before use in the device, the dispenser 3, which consists of a cylinder-shaped cartridge, closed at one end by a cover 13 and at the other end by a bottom 15. In Fig. 6 the Spen of 3 is shown as ready to use, by the lid 13 abgenom men and slipped over the bottom 15.

In this case, the lid 13 has a circumferential collar 14 and an adjoining neck 1 6, wherein the collar 14, whose clear diameter corresponds to the outer diameter of the bottom 15, to the bottom 15, which is designed as a cap, is slipped, while the nozzle 16 of Fixie tion of the dispenser 3 in the receptacle 2 of the table 1 is used.

In the cartridge, a slider 12 is arranged, on which the stack of

Sanding sheets 1 1 rests.

Both the lid 13 and the bottom 15 have a central opening 17, 18, which will pass from a plunger 9 of the plunger device 5 in function.

4, the plunger device 5 is shown as a partial section of Fig. 3 in an enlarged view. It can be seen that the recording

2 has a through hole 19 which is penetrated by the plunger 9, if a Nachschieben the sanding sheets 1 1 after removal of the upper th sanding sheet 1 1 should be made.

As can be seen further in FIG. 4, the plunger device 5 has a mouthpiece 10, into which the end of the dispenser facing away from the bottom 15

3 is inserted, for better insertion, the mouthpiece 10 has an insertion bevel 21.

Further, the mouthpiece 10 is provided with an annular disc 20, whose clear diameter is smaller than the clear diameter of the cartridge 8 and the abrasive sheets 1 1, but larger than the grinding plate of a grinding tool, which is shown in FIG. 5 as a robot 22.

The sanding sheets 1 1 are arranged rectified so that always facing a for example velcro layer to be introduced sanding plate, currency end opposite the abrasive layer with a grain on the Velcro layer of the underlying sanding sheet 1 1 rests.

It is also conceivable that the sanding sheets 1 1 have a perforation, in particular for the removal of sanding dust.

As Figure 1 shows, according to a preferred embodiment, the inner surface of the dispenser 3 is provided with a peripheral contour corresponding to the order fangskontur appropriately trained abrasive sheets 1 1. The position of the holes in the sanding sheets 1 1 is defined by the Vorpositio ning the sanding sheets 1 1 by the circumferential contour, so that a placement of the sanding sheet 1 1 is significantly simplified on the sanding pad of a grinding tool 24 at the same Aufsetzwinkelorientierung the sanding pad.

It is also conceivable, instead of the Velcro layer of the abrasive layer facing away from the sanding sheets 1 1 form a smooth surface, that the sanding sheets 1 1 are sucked by means of a vacuum suction in the sanding plate.

Since the sanding sheets 1 1 are flexible, they can be pulled out of the dispenser 3 after connection with the sanding pad.

The plunger 9 passes through a through hole 19 of the receptacle 2 as well as the center openings 17, 18th

As mentioned, in Fig. 5 in a schematic plan view of an abrasive tool in the form of a robot 22 is shown, the robot arm at his free end has a grinding tool 24 with a grinding plate, not shown. With this robot 22 programmed grinding work on a workpiece surface are performed. To change a worn abrasive sheet 1 1, the sanding pad is brought into contact with the upper abrasive sheet 11 in the dispenser third

For changing donors 3 after their emptying a person 25 is in use, which can also use dispenser 3 with respect to the abrasive grain unterschiedli chen abrasive sheets.

In order to avoid contamination of the working area of the person 25, the working area of the robot 22 is separated from that of the person 25 by a partition wall 26, which also protects the device according to the invention positioned on the base plate 7, at least in a partial area. LIST OF REFERENCE NUMBERS

1 table

2 recording

3 donors

4 upper deck

5 ram device

6 compressed air line

7 base plate

8 cartridge

9 pestles

10 mouthpiece

1 1 abrasive sheet

12 slides

13 lids

14 collar

15 floor

16 nozzles

17 center opening

18 center opening

19 through hole

20 ring disk

21 insertion bevel

22 robots

23 robotic arm

24 grinding tool

25 person

26 partition

Claims

claims

1. A device for loading a grinding tool with a preference as flexible abrasive sheet (1 1), characterized by a table (1) having a plurality of receptacles (2), in each of which a lot of number of stacked abrasive sheets (1 1) receiving donor (3) is removably arranged, wherein the table (1) is intermittently moved so that the dispenser (3) in the effective range of a plunger device (5) ge reached, with an abrasive sheet (11) can be brought into a removal position.

2. Device according to claim 1, characterized in that the measures were taken (2) are arranged at the same distance from each other.

3. Device according to claim 1 or 2, characterized in that the table (1) is designed as a rotary table or sliding table.

4. Device according to one of the preceding claims, characterized in that the table (1) is pneumatically, hydraulically or electrically driven by a motor.

5. Device according to one of the preceding claims, characterized in that a top deck with recesses for holding the dispenser (3) is provided parallel and distant from the table (1).

6. Device according to one of the preceding claims, characterized in that the plunger device (5) has a pneumatically, hy cally or electromotively axially movable plunger (9) which bears against a slide (12) of the dispenser (3), wherein on the Slider (12) of the stack of abrasive sheets (1 1) rests.

7. Device according to one of the preceding claims, characterized in that the receptacle (2) has a through hole (19) has, whose clear diameter is greater than the clear diameter of the plunger (9).

8. Device according to one of the preceding claims, characterized in that the plunger device (5) has a mouthpiece (10) separated from the receptacle (2) through which the dispenser (3) is guided rich with a Endbe.

9. Device according to one of the preceding claims, characterized in that the mouthpiece (10) on its the dispenser (3) facing side has an insertion bevel (21).

10. Device according to one of the preceding claims, characterized in that the mouthpiece (10) with an annular disc (20) is seen ver, whose clear diameter is smaller than the outer diam Ser of the abrasive sheet (1 1).

1 1. Device according to one of the preceding claims, characterized in that the device is housed.

12. Device according to one of the preceding claims, characterized in that the encased device has a removal opening for changing the dispenser (3).

13. Device according to one of the preceding claims, characterized in that the device is provided with a sensor for filling level detection of the respective dispenser (3).

14. Device according to one of the preceding claims, characterized in that at least one device is mounted on a stationary base plate (7).