JPS6346281B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a piston-type fluid actuator using a cup-shaped diaphragm, and is used for drawing lines or scribing work on the surface of a workpiece to be mechanically finished. For example, when a diamond cutter is used to cut plate glass flowing on a conveyor, the workpiece is made of a material that is easily damaged and has small irregularities on its surface. , a scribing needle, a diamond cutter, etc., can always be brought into contact with the surface of the target workpiece with the same pressure.

Prior Art Conventionally, in this type of device, the piston rod connected to the sliding piston is exposed to the atmosphere, so there is a difference between the pressure receiving area of the fluid pressure applied to the piston in one direction and the pressure receiving area in the other direction. The pressure receiving area of the fluid pressure of the piston on the side where the piston rod is formed differs by the cross-sectional area of the piston rod from that of the piston that does not form the piston rod,
As a result of the different pressure receiving areas, even if the same fluid pressurizing force is applied simultaneously to one direction and the other direction of the piston, the piston will move in the direction in which the piston rod is formed, and the forces of movement of the piston in one direction and the other direction will be balanced. In order to do this, it is necessary to apply a pressure equal to the cross-sectional area of the piston rod to the piston that forms the piston rod, and this adjustment is extremely difficult.

Also, the piston rod connected to the piston,
When exposed to the atmosphere, it must be sealed with a sealing material such as a packing or O-ring, but this sealing material creates strong resistance to the piston rod when the piston slides, and resists the pressurizing force of the pressurized fluid. This has resulted in the drawback that accurately proportional sliding of the piston is extremely difficult. In addition, in order to eliminate this drawback, the present inventor has proposed
As shown in the issue, we considered a method in which the piston and piston rod were placed in a fixed position and the cylinder was moved forward and backward. Compared to the conventional method, this method has the advantage of significantly reducing sliding resistance and making the pressure receiving area of the fluid pressure in one direction and the other direction of the piston the same. Because it connects the pressurized fluid inlet and outlet pipes, as the cylinder advances and retreats, the pressurized fluid inlet and outlet pipes also move, causing bends and tension in the inlet and outlet pipes, so sliding of the piston rod may occur. Dynamic resistance cannot be completely eliminated, and it has been difficult to ensure that the piston slides in proportion to the pressurizing force of the pressurized fluid.

Problems to be Solved by the Invention The present invention reliably eliminates the above-mentioned drawbacks, and is suitable for drawing lines or scribing on the surface of workpieces to be mechanically finished, or when carrying objects that are carried on a conveying device. When cutting plate glass with a diamond cutter, etc., if the workpiece is made of a material that is easily damaged and has small irregularities on its surface, it is recommended to use a scribing needle, diamond cutter, etc. In order to make it possible to always contact the surface of the target workpiece with the same pressure, it is intended to avoid being affected by the pressurized fluid introduction and outlet pipes that introduce the pressurized fluid.

Means for Solving the Problems In order to solve the above-mentioned drawbacks, the present invention provides a fixing protrusion that is slidably fixed in the cylinder via a bearing in the axial direction and is provided on the side surface of the cylinder. A piston rod that protrudes outside the cylinder through a long hole and has pistons at both ends;
A pair of cup-shaped diaphragms are connected to the outer end of each piston, and a mounting part provided on the opening edge of the other end is fixed to the cylinder via a folded part that can be moved by rolling. A pair of pressurized chambers are formed between both end walls provided in the axial direction, and pressurized fluid is introduced through the piston rod from the end surface of the fixed protrusion so that one end of each pressurized chamber is opened. It consists of an exit route.

Function Since the present invention is constructed as described above, after the fixing protrusion of the piston rod is fixed at an appropriate position of the device using the product of the present invention, a constant pressure fluid is supplied from the fluid supply device via a regulator or the like. If the pressure is supplied to the pressurized chamber from the inlet/outlet passage, the piston rod tends to move from the pressurized chamber supplied with strong pressure fluid to the pressurized chamber supplied with weak pressure fluid, but as mentioned above, the piston rod Since the fixed protrusion is fixed, the cylinder moves the folded portion of the cup-shaped diaphragm while rolling it while the piston rod and piston are held in place. This movement occurs only when there is a difference in the pressure of the pressure fluid supplied to the pressurizing chamber, since the pressure receiving areas of the two cup-shaped diaphragms are the same. Like the one where the piston rod is protruded and the pressure receiving areas of the pair of pistons are different.
Even if a pressure difference occurs in the pressure fluid, the piston will not be able to operate or will operate beyond the pressure difference. Therefore, if pressure fluid of the same pressure is introduced into the pressurizing chamber via the regulator, the pressure applied to the piston via the cup-shaped diaphragm is easily balanced.

In addition, sealing materials such as packing and O-rings are not connected to the piston rod as in the past, and there is no pressure fluid inlet/outlet pipe connected to the cylinder that moves forward and backward, and the pressure fluid inlet/outlet path is fixed. Since it is formed on the piston rod, which is located at the same position, there is no sliding resistance on the cylinder as it moves forward and backward, and it is possible to transmit almost the same output as the pressure fluid applied to the pressurizing chamber to the cylinder. Therefore, if a constant pressure is supplied to the inlet and outlet passages via a regulator, it is possible to always supply an output corresponding to the supply pressure to the working protrusion. The supply pressure to the working protrusion does not change even if the cylinder and piston move relative to each other, so it is Even when the workpiece is made of a material that is easily damaged and has small irregularities on the surface, it is possible to always make follow-up contact with the scribing needle etc. on the workpiece surface with the same pressure, and the follow-up contact pressure is It can be easily set by the pressure of pressurized fluid.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a cylinder, a cylinder body 2 has a front cover 3 at one end, a rear cover 4 at the other end,
They are connected and fixed by fixing rings 5 and 6, respectively, to form both end walls 7 and 8. 10 is the cylinder body 2
A bearing fixed to the inner surface of the piston rod 12 with a screw 11, formed by a slide bearing,
is slidably fixed. Reference numerals 13 and 14 indicate fixing protrusions that protrude from both axial sides of the piston rod 12, which protrude outward from an elongated hole 15 bored in the axial direction of the side surface of the cylinder body 2, and which are attached to an appropriate device in which the product of the present invention is installed. Fix it. Pistons 16 and 17 are fixed to both ends of the piston rod 12 with fixing screws 18 and 19, and are provided with appropriate sliding intervals 21 and 22 between the cylinder body 2 and the inner peripheral surfaces of the front and rear covers 3 and 4. is forming. 23, 24
has bottom plates 25, 26 on both end surfaces of the pistons 16, 17.
It is a cup-shaped diaphragm coated with a thin film made of a composite material of cloth such as polyester and a rubber-like elastic body, and has a U-shaped cross section that allows rolling movement, and is formed with sliding intervals 21 and 22. Attachment portions 31 and 3 at one end via folded portions 27 and 28 of
2 is inserted and fixed between the front and rear covers 3, 4 and the cylinder body 2. Reference numerals 33 and 34 denote pressurized chambers formed between the cup-shaped diaphragms 23 and 24 and both end walls 7 and 8 of the cylinder 1. Connect to supply device.
Reference numerals 35 and 36 denote introduction and output passages for introducing and extracting pressurized fluid from the fluid supply device into the pressurizing chambers 33 and 34. Outflow inlet 37,
By forming one end of each of the pressurizing chambers 33 and 34 to open through the diaphragms 38, the cup-shaped diaphragms 23 and 24 have the same pressure receiving area for the pressurized fluid. In other different embodiments, the fixing protrusion may protrude only on one side of the piston rod 12 and the inlet/outlet passages 35, 36 may be formed in parallel, or a separate fixing protrusion having the inlet/outlet passages 35, 36 may be provided. , the inlet and outlet passage 3 of the piston rod 12
It may also be connected to 5 and 36. Reference numeral 41 denotes a working protrusion fixedly protruding from the front cover 3 of the cylinder 1, and is formed into an appropriate shape so as to be convenient for mounting a member corresponding to the purpose of the device in which the product of the present invention is installed.

In the configuration as described above, a constant pressure fluid is introduced from the fluid supply device through a bleed type regulator or the like and is supplied to the pressurizing chamber 3 from the outlet passages 35 and 36.
3 and 34, the piston rod 12 tries to move from the pressurizing chamber 33 or 34 supplied with strong pressure fluid to the pressurizing chamber 34 or 33 supplied with weak pressure fluid, but the above-mentioned Since the piston rod 12 fixes the fixing protrusions 13 and 14 at appropriate positions of the device using the present invention, the piston rod 12 and the pistons 16 and 17 are
While being held in a fixed position, the cylinder 1 is moved together with the working protrusion 41 while rolling the folded portions 27 and 28 of the cup-shaped diaphragms 23 and 24. This movement is caused by the cup-shaped diaphragm 23
Since the pressure receiving areas of and 24 are the same, pressurization chamber 3
This occurs only when there is a difference in the pressure of the pressure fluids supplied to pistons 3 and 34, and as in the conventional piston rod protruding from the pressure receiving side of one or the other piston, the pressure receiving area of the pair of pistons is different. Even if there is a pressure difference in the fluid, the piston will not be unable to operate or will not operate beyond the pressure difference. Therefore, the same pressure fluid is supplied to the pressurizing chamber 3 through the bleed type regulator.
3, 34, the cup-shaped diaphragm 2
The pressures applied to the pistons 16, 17 via 3, 24 are easily balanced.

In addition, the piston rod 12 is not connected to sealing materials such as packing or O-rings as in the past, and the cylinder 1, which moves forward and backward, is not connected to pressure fluid inlet and outlet pipes, etc. Since the inlet and outlet passages 35 and 36 are formed in the piston rod 12 that is fixedly located, there is no sliding resistance on the cylinder 1 that moves forward and backward, and the pressure fluid applied to the pressurizing chambers 33 and 34 is approximately equal to the pressure fluid. It becomes possible to transmit the same output to the cylinder 1, and if a constant pressure is supplied to the inlet and outlet passages 35 and 36 via a bleed type regulator etc., the output corresponding to the supply pressure is always transmitted to the working protrusion 41.
It becomes possible to supply The supply pressure to the working protrusion 41 is
Even if 7 moves relatively, it will not change.

Effects of the Invention Since the present invention is configured as described above, the piston rod is not connected to sealing materials such as packing or O-rings as in the past, and the cylinder that moves forward and backward has a pressure fluid inlet and outlet pipe. Since the pressure fluid introduction and outlet passages are fixedly located and formed on the piston rod, there is no sliding resistance on the cylinder as it moves forward and backward, and the pressure applied to the pressurized chamber is reduced. It is possible to transmit approximately the same output as the fluid to the cylinder, and by supplying a constant pressure to the inlet and outlet passages via a regulator, it is possible to always supply the output corresponding to the supply pressure to the working protrusion. It becomes possible. The supply pressure to the working protrusion does not change even if the cylinder and piston move relative to each other, so it can be used for scribing lines on the surface of workpieces to be machine finished, and for cutting plate glass with a diamond cutter. When performing work, etc.,
Even if the workpiece is made of a material that is easily damaged and has small irregularities on its surface, it is possible to always make follow-up contact with the scribing needle, etc. on the workpiece surface with the same pressure, and also make follow-up contact. The pressure can be easily set by the pressure of the pressurized fluid.

Therefore, in addition to the above-mentioned scribing device, it can also be used as a "tracing" device, etc., which moves a cutter following a template or model and reproduces the shape of the template or model on a workpiece. In addition, the present invention enables an extremely wide range of applications.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
FIG. 1 is a sectional view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... Cylinder, 7, 8... Both end walls, 10...
...Bearing, 12...Piston rod, 13, 14...
... Fixed protrusion, 15 ... Elongated hole, 16, 17 ... Piston, 23, 24 ... Cup-shaped diaphragm, 2
5, 26... Bottom plate, 27, 28... Folded part, 3
1, 32... Mounting part, 33, 34... Pressurizing chamber, 3
5, 36...Introduction and exit.

Claims (1)

[Claims] 1 A fixed protrusion that is slidably fixed in the cylinder via a bearing in the axial direction and provided on the side surface projects outside the cylinder through a long hole provided in the axial direction of the cylinder, and pistons are provided at both ends. A piston rod, a pair of cup-shaped diaphragms with a bottom plate connected to the outer end of each piston, and a mounting part provided on the opening edge of the other end fixed to the cylinder via a folded part that can be rolled, and this cup-shaped diaphragm. A pair of pressurizing chambers are formed between the cylinder and both end walls provided in the axial direction of the cylinder, and a pressurizing chamber passes through the inside of the piston rod from the end surface of the fixed protrusion so that one end of each pressurizing chamber is opened. A piston-type fluid operating device characterized by comprising a fluid inlet and outlet passage.