JPH036273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to provide air compression to the surface of the table top plate, the table top plate has a plurality of air ports connected to the pressurized side of the compressor, and a layer of fabric is placed on the table top plate. So-called air cushion tables are known for handling and processing laminated textile layers, which can be moved easily. Furthermore, so-called suction tables are known as cutting tables, which prevent the fabric layer placed on the table top from sliding during cutting. In order to save the driving power required for the vacuum pump, the tabletop is divided into several sections transversely to its longitudinal direction, and the vacuum pump is connected only to the air opening of the section where the cutting knife is placed. Automatic cutting machines are known. For this purpose, in this automatic cutting machine, a carriage, which supports the cutting knife and can be moved along the table, controls the connection of air ports in different areas to a vacuum pump via a plurality of valves.

It is an object of the present invention to replace the known suction tables for handling flat materials such as textiles (hereinafter referred to as flat materials) which are handled at least in part by hand with ease of handling of flat materials and with less power consumption. The goal is to improve it so that the cost is as low as possible.

The present invention comprises a table for handling and processing flat material comprising a table top board having a plurality of zones, the table top board having a plurality of air ports in each zone, the plurality of air ports being It is assumed that the pump is connected to the pump via valves and is adjustable. It is an object of the present invention to provide the table such that a plurality of air ports in at least one of the plurality of sections are connected to either the suction side or the pressurization side of the air pump via at least one switching valve. at least one pressure sensing element communicating with the surface of the tabletop in the corresponding area is associated with each said area, said pressure sensing element being associated with said respective area; This is accomplished by at least one element-controlled shut-off valve being associated with a plurality of air ports in each zone, whereby pressure sensing elements and When no flat material is placed on the part of the surface of the tabletop with which it communicates, the air openings in that area are separated from the air pump by said shut-off valve, i.e. the air openings are separated from the air pump by said shut-off valve. The connection line between them will be closed. The basis for finding said solution is that the fabric or the like to be cut is manually guided through a cutting machine (either as a simple cutting machine, which is moved manually on a table top board or on a frame). When cut to a predetermined size or shape using a cutter supported on the The resulting laminated fabric or the like is continuously moved manually during cutting. This means that the position and/or orientation must be changed, so that it is desirable to be able to switch from suction operation to air compression operation or vice versa within a short time; Unlike when cutting with an automatic cutting machine, a large area of the tabletop is often not covered by the material to be cut, and as a result this area is constantly connected to the air pump. This is based on consideration of the situation that, if left as is, the pump output for suction operation and air cushion operation for this area would be wasted. The basic idea of the invention is to make it possible, by means of an automatic actuation control, to cut off the suction or air cushion to the table area uncovered by the flat material to be cut. Therefore, a relatively low driving power of the air pump required for the table according to the invention is sufficient. Furthermore, if the switch from suction operation to air compression is made during cutting, the movement and orientation of the material to be cut on the table can be quickly and effortlessly changed. This can be done, for example, by installing a simple manual switch on the cutting machine or by providing a foot switch under the table or the like.

The switching valve can be configured as a two-way valve. However, in order to be able to use simple multiple valves with opening or closing capabilities,
A pipe connected to the air port of the table top board via the valve is connected to either the suction side or the pressure side of the air pump to form a switching valve.
The use of simple valves is recommended. Of course,
Connect the suction side of the air pump to multiple specific areas,
It is possible to provide each zone with an individual switching valve or a combination of the two valves mentioned above in order to make it possible to connect several other zones to the pressurized side. Although it is possible to provide individual air pipes leading from each air port to the pump, it is also possible to provide separate air pipes for each area that can be connected via a valve specified on the suction side or a valve specified on the pressure side of the air pump. It is easy to install the air box under the table top panel. Said pressure sensing element is connected to the respective air box for sensing the pressure within the respective air box, which pressure is determined whether the area of the table associated with the associated air box is flat, whether during suction operation or air cushion operation. It depends on whether and how much material is covering it. The pressure sensitive element can be adjusted to block the area, for example, when less than 1/4 of the area is covered by flat material. If each zone is connected to three positions, a first position associated with suction operation, a second position associated with air suction operation, and, for example, a pipe leading to the corresponding zone in that position. If a switching valve is used which can assume a third position, which is an intermediate position of the switching valve, the switching valve can also form a shut-off valve controlled by a pressure-sensitive element. However, if it is to be achieved using the simplest and cheapest valves, it is recommended to use a plurality of individual shut-off valves which have only opening and closing functions.

Practical tests have shown that it is appropriate to connect each pressure sensitive element directly to the air inlet of the corresponding table area. This has the advantage that the installation and adjustment of the pressure-sensitive element is not difficult and that changes in the response characteristics of the pressure-sensitive element over time do not cause any disturbances. In a preferred embodiment of the table according to the invention, the pressure-sensitive elements are therefore connected to a hole in the table top plate, which is centrally located in the corresponding area. Thus, the suction conditions in the area covered by the flat material to be cut are transferred through the hole for the pressure-sensitive element along the table surface under or through the flat material. Will be using it. Furthermore, this also applies to the pressurized state that is created in the table top in the case of air-cushion operation. The disadvantage in practice is that one area is always not connected when the flat material does not cover the hole for the pressure-sensing element, even if other parts of the corresponding area are still covered by the flat material. It has been proven that it is not important.

The operator of a hand-guided cutter stands on the normal longitudinal side while working and, for example, cuts individual sections of a layer of fabric more precisely each time a layer of fabric is roughly cut. As it is drawn towards itself for cutting, the tabletop is divided longitudinally and perpendicularly into zones, and the dimensions of the zones are determined by the first longitudinal side of the tabletop, i.e. the working area. Another feature of the invention is that the respective areas are arranged so that they become smaller towards the longitudinal sides on which the members stand.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, the structure of the table of the present invention will be explained based on FIGS. 1 to 3.

As shown in FIG. 1, the table has a table top 10 resting on a plurality of legs 12, and an air pump 14 on the underside of the table top.
is arranged and this air is preferably designed as a so-called ring compressor. As shown in FIGS. 2 and 3, at least a large part of the tabletop board is provided with a plurality of air ports 16 in the shape of a duct that widens at the upper end. A cone-shaped air distribution member 18 is provided at the mouth.
is inserted. Annular air port 1 made in this way
A supply duct 20 opens in each of the four air boxes 22, and each of the plurality of supply ducts 20 connects each of the plurality of air ports to the inside of one of the four air boxes 22. The air box 22 is fixed to the underside of the table top panel in an airtight state.

As shown in FIG. 3, the tabletop board 1
According to the invention, 0 is divided into four areas, . Area is tabletop board 10
and extends along the entire length of the tabletop. The width of the area is approximately 1/2 of the width of the table top 10. On the side facing the first longitudinal side 26 of the table top 10, the zones adjoin the zones, the length of the zones being the same as the length of the zones. The width of the area is approximately 1/4 of the width of the tabletop, i.e. 1/2 of the width of the area.
It is. The zones and zones are arranged side by side between the zones and the first longitudinal side 26 of the table top 10. These two areas,
has the same length, i.e. 1/2 the length of the area, and its width is the same as the width of the area. The division of the table top board according to the invention is based on the assumption that an operator of the cutting machine, not shown in the figures, stands on the first longitudinal side 26 of the table top board 10. Therefore, the divisions of the table top become narrower in the direction facing the operator.

The shape, size and placement of the air box 22 corresponds to the shape, size and placement of the areas, and. That is, each area is actually delimited by an air box.
Therefore, the lines dividing the areas in FIGS. 3 to 5 are imaginary lines, and these lines do not actually appear on the surface of the table top.

The air pump 14 is a suction valve slider housing pipe 3
0 and a pressurizing valve slider housing pipe 32. A suction switching valve, ie, a suction valve 34, is connected to the pipe 30, from which a short connecting pipe having a suction filter 36 branches off. Similarly, an exhaust switching valve or exhaust valve 38 is connected to the pipe 32, and a connecting pipe equipped with a muffler 40 branches off from the pipe 32 so that air is not supplied from the air pump 14 during the suction operation. The air is blown out through a connecting pipe equipped with a muffler 40.

In the preferred embodiment, the same type of valve is used at all locations. The structure of this valve will be explained in detail based on FIG. Each valve has a valve case 46
It has a valve port 44 therein, and a one-way valve slider 48 is provided so as to be slidable within the valve case 46 . Additionally, an electromagnet 50 is mounted to the valve case, the core of the electromagnet 50 being connected to a valve slider actuating rod 52, the opposite end of which supports the valve slider 48. Additionally, a compression spring 54 is provided to maintain the valve slider 48 in the open position of the valve port 44 when the electromagnet is not energized, while at least substantially The valve slider is pulled across the valve port 44 to form a tight, gas-tight closure.

In the case of the illustrated suction valve 34 and exhaust valve 38, the suction pipe 30 and the pressurization pipe 32 form a valve case, respectively, and unlike other valves used in tables, each has two valve ports 44', 44''. has.

As shown in FIG. 2, a connecting pipe 60 is connected from each of the plurality of air boxes 22 to a shut-off valve 62, that is, to a valve port 44 of the shut-off valve 62, while the valve cases 46 of the shut-off valves are all connected to a collecting pipe 64. Ru. And each suction valve slider housing pipe 3
The collection pipe 64 connects all the valves to the air pump 14 via a suction pipe 66 and a pressurization pipe 68, which open at a valve port 44' into the valve slider receiving pipe 32 for pressurization.

Figure 3 shows air openings 1 in all areas, .
6 shows the table with air supplied, ie all areas are connected for air compression operation. In this case, the suction valve 34 and the shutoff valve 62 are not energized, while the electromagnetic magnet 50 of the exhaust valve 38 is energized.
The valve slider 48 of the exhaust valve 38 is compressed by the compression spring 54.
It is pulled upwards as seen in Figure 3 against the action of. In this operating state, the valve opening 44' of the suction valve 34 is closed, while its valve opening 44'' is opened so that the air pump 14 can draw outside air through the suction filter 36. In the case of the exhaust valve 38 In this case, the situation is reversed, the valve slider of the exhaust valve opens the valve port 44' and conversely closes the valve port 44'', so that the air compressed by the air pump flows through the valve port 4.
4' to the pressurized pipe 68 and enters the collection pipe 64. From this collection pipe 64 the air reaches the air box 22 via the open valve port 44 of the shutoff valve 62.

By switching the suction valve 34 and the exhaust valve 38, the operation is switched from the air cushion operation to the suction operation. FIG. 4 shows the table in an operating state, with the solenoid magnet of suction valve 34 energized and all other valves, including exhaust valve 38, de-energized. In this condition, the air pump 14 draws air from the collection pipe 64 via the suction pipe 66 and blows the collected air through the muffler 40 to the outside atmosphere.

FIG. 2 shows the situation where the zone is not connected and the zone, , is connected to the suction operation. area,
, the suction valve 34, the exhaust valve 38, and the shut-off valve 62, respectively, are in the same position as in FIG. Closed. Therefore, no air pump power acts on the area.

To control the shutoff valve 62, each section has a pressure sensing element 70 having a flexible switching membrane 74 made of electrically insulating material within the housing 72. Attached to the membrane is a contact 76 which connects the pressure sensitive element housing 72.
The screw contacts 78 are electrically insulated and mounted therein. Electrical wires 80 and 82, which pass insulated through pressure sensing element housing 72, are connected to screw contacts 78 and contacts 76, respectively. In FIG. 2, a suction connection pipe 84 opens into the chamber of the pressure sensing element 70, which is arranged below the switching membrane 74. The suction connecting pipe 84 is connected to a tube 86 that passes through the air box 22 in an airtight manner to prevent air from leaking and is connected to a sensing element hole 88 that is open on the surface of the table top board 10. There is. Balance holes 90 are then provided in the sensing element housing 72 for the chambers provided on both sides of the switching membrane 74. These holes are dimensioned in such a way that they serve as a diaphragm, ie a restriction. An adjustment screw may be attached to the balance hole 90 to allow the effective size of the balance hole 90 to be adjusted.

As shown in FIG. 2, a stacked fabric layer consisting of a plurality of fabric layers 94 is placed on tabletop board 10. As shown in FIG. If a suction action is applied to the plurality of air holes 16, the sucked air will flow through the more or less air permeable fabric to reach the pressure sensing element holes 88. As a result, if there is no difference in pressure, the switching membrane in the stable position shown by the broken line in FIG. Cut the contact between. Of course, this presupposes that the shape of the balance hole 90 is sufficiently small. The suction force to which pressure sensing element 70 can respond may also be adjusted by means of screw contact 78.

The control circuit of the table according to the invention is such that, during the suction operation, each zone is provided with zone(s) where said hole 88 is not covered by the flat material to be cut. The pressure sensing element 70 is designed to shut off. In this case, the pressure sensing element 70 provided in that area will connect the connecting wire 80 and the connecting wire 82 to each other and actuate the electromagnet of the corresponding shut-off valve 62.

FIG. 6a shows 3 for driving the air pump 14.
1 shows an electric motor 100 configured as a phase motor. In the figure, the power feed line 102 on which the main switch 103 is arranged is shown using commonly used symbols. A commonly used star-shaped triangular circuit 104 is provided in the electric motor 100, and this circuit includes three relay coils a, b, and c, respectively.
It has three relays A, B, and C and a plurality of contacts. A description of the plurality of contacts included in the star-shaped triangular circuit 104 itself will be omitted. The subcircuit shown in FIG. 6a is basically part of a star-triangular circuit for the electric motor 100 and is arranged between points X and Y, which are also shown in FIG. 6b. FIG. 6b shows a partial circuit for switching a table according to the invention from air compression operation to suction operation and vice versa, and the area(s) of the table being covered by a fabric layer 94. A partial circuit is shown for closing off the uncovered area of the table during suction operation unless otherwise specified.

The partial circuit consists of two fuses 108 and a transformer 1
10, and is connected to a power feed line 102 through relay coils a, b, and c, and includes a signal lamp 112 that indicates that the motor 100 is rotating, and a delay relay T1 that controls a double-throw switch t1. be done. The partial circuit is also contact a1 of relay A.
and contact a2, contact b1 of relay B, contact c1 and contact c2 of relay C, switching contact d1 of duplex switch
and a switching point e. The above-mentioned elements are connected to each other as shown in the drawings, so a detailed explanation will be omitted.

From left to right and from top to bottom in the figure, the partial circuit shown in FIG.
8. It is configured to include the contact d3 of the above-mentioned dual switch, the contact a4 of the relay A, and the coil of the suction valve 34.

Finally, the subcircuit comprises a delay relay T2 controlling the switching contact t2, contacts 76 of the pressure sensing elements 70 and coils 62 of the shutoff valves in the area of the table, . Ru. Since the connection of each element described above is explained in detail in FIG. 6b, detailed explanation will be omitted.

The function of the control circuit according to FIGS. 6a and 6b is as follows.

1 Starting the air pump electric motor 100 When the main switch 103 is turned on, the electric motor 10 is started by manually turning on the switching contact e.
0 is placed in a state where it can be operated. This energizes the delay relay T1 so that the double throw switch t1 of this delay relay initially assumes the position shown in FIG. 6a. Then, current flows through relay coil C, and as a result, all contacts of relay C, including contact c1, are closed. Current then flows through relay coil a, closing all contacts of relay A, including contacts a1 and a2. The signal lamp 112 lights up and the electric motor starts.

After the delay time of the delay relay T1 has expired, the double-throw switch t1 of the delay relay T1 is switched to another contact, so that no current flows through the relay coil c. In other words, relay C is disconnected. At the same time, current flows through relay coil b and all contacts of relay B are closed. Relay coil a of relay A
Since relay A continues to receive current through the closed contacts d1, a1, and a2, relay A is activated and signal lamp 112 continues to be lit. The starting state of electric motor 100 is thus completed.

2 Air action operation The above-mentioned multiple switch is "air action action"
When in position , contact d1 of the duplex switch remains closed and contact d2 is closed, while contact d3 remains open. Since contact a3 is already closed, current flows through the coil of exhaust valve 38, so that exhaust valve 38 assumes the position shown in FIG. No current flows through the suction valve 34 and all shutoff valves 62. Therefore, the table becomes air-cushioned.

3 Suction Operation When the duplex switch is moved to the "suction operation" position, the duplex switch contact d1 remains closed, but the duplex switch contact d2 is opened and the duplex switch contact d3 is closed. Since the contact a4 is already closed, current flows through the coil of the suction valve 34, while no current flows through the coil of the exhaust valve 38. These two valves assume the positions shown in FIG. At the same time, delay relay T2 is activated and the layer of fabric 94 is activated until the delay time of delay relay T2 expires to eliminate any effect of pressure sensitive element 70, i.e. after the table has been switched to the suction state. Switching contact t2 of delay relay T2 until sufficient suction is formed downward.
remains open. Therefore, delay relay T
It is immaterial whether the contacts 76 of the pressure sensing elements 70 are open or closed until the second delay period expires.

After the delay time of delay relay T2 has expired, switching contact t2 is closed. If all areas,,
, are covered by a layer of fabric 94, all contacts 76 remain open and therefore no current flows through all shutoff valves 62. This means that suction is occurring in all areas. However, if any area in the table is not sufficiently covered by the layer of fabric and any one of the plurality of pressure sensing elements 70 is activated, the pressure sensing The contacts 76 of the element are closed and current flows through the coil of the shut-off valve 62 associated with that area of the table, so that the shut-off valve is connected to the corresponding area of the table, as shown as the area in FIG. Block the air flow to.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an embodiment of the table of the present invention when viewed in the direction of arrow A in FIG.
Figure 2 is a vertical sectional view of the table top showing one of the valves and the pressure sensing element enlarged when the table shown in Figure 1 is rotated 90 degrees;
The figure is a plan view of the tabletop board of the present invention,
The different top plate areas are shown in solid lines (the top plate surface is not actually partitioned) and the air pumps, valves and air pipes are shown schematically, and all areas of the table are connected to the air cylinders. FIG. 4 is a plan view of the table top board corresponding to FIG. 3 in which all areas of the table are connected to the suction operation, and FIG. is not connected to the suction operation and the remaining area is connected to the suction operation.
FIG. 2 is a plan view of a tabletop board corresponding to the figure;
6a and 6b illustrate the electrical control circuitry used in one embodiment of the table of the invention shown in FIGS. 1-5. ,,,...area of the tabletop board,
10...Table top board, 16...Air vent, 2
2... Air box, 24... Second longitudinal side surface, 26... First longitudinal side surface, 30... Suction slider housing pipe, 32... Pressurization slider housing pipe, 34... Suction Switching valve (suction valve), 38...
...Exhaust switching valve (exhaust valve), 40, 40', 40''
... Valve port, 60 ... Connection pipe, 62 ... Shutoff valve, 64 ... Collection pipe, 66 ... Suction pipe,
68... Pressurized pipe, 70... Pressure sensing element, 7
2...Housing, 74...Switching membrane.

Claims (1)

[Scope of Claims] 1. A table comprising a table top board having a plurality of zones, wherein the table top panel of the table is adjustable for each zone, and the table top disk of the table is adjustable for each zone, and has a plurality of valves. A table for handling and processing flat materials, more particularly a table for textile cutting, having a plurality of air ports connectable to an air pump, in which a plurality of air ports in at least one of said plurality of zones are provided. the port is connectable via at least one switching valve to either the suction side or the pressurization side of the air pump;
at least one pressure sensitive element in communication with the surface of the tabletop in the corresponding area is provided in each of said areas, and at least one pressure sensitive element for each area is controlled by the pressure sensitive element; a shutoff valve is associated with a plurality of air ports in each zone, and when no flat material is placed on the portion of the surface of the table top that communicates with the pressure sensing element in the zone; A table for handling and processing flat materials, such as textiles, characterized in that a plurality of air ports in that area are separated from the air pump by said shutoff valve. 2. The table according to claim 1, wherein one switching valve is provided in common to all of the zones. 3. The table according to claim 1 or 2, wherein the shutoff valve is provided only to shut off a plurality of air ports from the suction side of the air pump. 4. According to any one of claims 1 to 3, wherein the pressure sensing element is connected to a hole in a table top board provided near the center of the corresponding area. Table listed. 5. Claims 1 to 4, characterized in that the plurality of valves are provided as electromagnetic valves.
A table listed in any of the sections. 6. The table according to any one of claims 1 to 5, wherein the switching valve is manually controllable. 7. A patent claim characterized in that the table top board is divided into a plurality of sections in the longitudinal direction and in a direction perpendicular to the longitudinal direction, and the area of the sections decreases toward the first longitudinal side of the table top. The table described in any one of the ranges 1 to 6. 8. The first section of the table top board is approximately 1/2 the size of the table top board and extends over the entire second longitudinal side, and the second section is disposed adjacent to the first section. and has the same length and approximately 1/2 the width as the first area, and the third area
Claim 7, wherein the zone and the fourth zone are arranged in the longitudinal direction of the table and in contact with the first longitudinal side surface of the table top board, and have substantially the same length. table. 9. A timing element is provided for deactivating a pressure sensing element for a short period of time prior to connecting a particular zone to the suction side of the air pump. The table described in any of paragraphs 8 to 8.