JP2010012503A - Pantograph type press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine where the elastic force of elastic bodies can be sufficiently utilized as pressurizing force, and further, the elastic bodies do not directly receive drag. <P>SOLUTION: The press machine is composed of: upper and lower bases 4a, 4b in which at least either serves as a pressurizing part; screw rods 2a, 2b freely rotatably supported, and further, when prescribed force is applied to a shaft direction, supported so as to be made freely slidable to the same direction; female screw bodies 3a, 3b screwed to the screw rods freely movably by the rotation thereof; and arms 5a to 5d connecting the respective female screw bodies and upper and lower bases, so as to form a pantograph. The screw rods 2a, 2b are parted to right and left in such a manner that the female screw bodies 3a, 3b are respectively screwed, further, elastic bodies 6 receiving the loads in the shaft direction applied to the parted right and left screw rods 2a, 2b from both the sides are interposed, and, when the right and left screw rods 2a, 2b are slid by the application of prescribed force to the shaft direction thereof, force against the sliding direction is applied to both the right and left screw rods 2a, 2b from the elastic bodies 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press device that pressurizes an object.

  The press device has a mechanism in which a pressing plate is moved by a motor or a cylinder to apply a pressing force to an object. However, there is a form in which an elastic force of an elastic body is used as the pressing force.

As an example, Japanese Patent Laid-Open No. 10-128777 (Patent Document 1) has been proposed. In this technique, as shown in FIG. 4, a pressure plate is lowered by a hydraulic cylinder to pressurize an object, but a stored spring 100 (elastic body) is interposed between the pressure plate and the piston rod. The object 100 is pressurized using the stored energy (elastic force) of the spring 100.
JP-A-10-128777 (FIGS. 1 and 3)

  According to the prior art, since the elastic force of the spring 100 can be used as a pressing force, the pressing force of the hydraulic cylinder can be reduced, and as a result, a device with a small press output standard can be adopted. This is useful because it can be simplified.

  However, on the other hand, since the spring receives the drag force from the object when pressed, it is easy to be pushed back from the object when you want to keep the pressurized state. The hydraulic mechanism was supposed to be. In addition, since there is a direct resistance, there is a problem that a strong spring is necessary.

  The present invention was devised in view of the above-described problems of the prior art, and is a press device that can sufficiently use the elastic force of an elastic body as a pressurizing force and that the elastic body does not directly receive a drag force. It is something to be offered.

For this reason, the panta-type press device according to the present invention is
Upper and lower bases, at least one of which is a pressure part,
A screw rod that is rotatably supported and supported so as to be slidable in the same direction when a predetermined force is applied in the axial direction;
A pair of female screw bodies that are screwed to the screw rods by their rotation;
It consists of an arm that forms a quadrilateral link that becomes a pantograph by connecting each female screw body and the upper and lower bases,
The screw rod is divided into right and left so that the female screw body is screwed together, and
An elastic body that receives the axial load applied to the left and right screw rods from both sides is interposed,
When the left and right screw rods are slid with a predetermined force applied in the axial direction, the elastic body applies a force against the sliding direction to the left and right screw rods.

  As described above, the press device according to the present invention basically has a pantograph of a quadrilateral link formed by arms by rotating a screw rod (hereinafter, the formed quadrilateral link is also simply referred to as a pantograph). ) Is deformed, and accordingly, a configuration of a panta-type press in which the upper and lower bases of the pantograph are moved (the pressurizing part is at least one side of the upper and lower bases). That is, the arm forming the pantograph is connected to a female screw body that is screwed into the screw rod, so that when the female screw body moves by the rotation of the screw rod, the pantograph is deformed, and accordingly the pantograph is connected above and below the pantograph. The bases to be moved move so as to be separated from each other. When pressurizing, the pantograph is expanded vertically by rotating the screw rod and moving the female screw body from the pantograph reduced state in which the upper and lower bases are in the approaching state. The speed at which the upper and lower bases move away, that is, the stroke speed of the base is fast at the start of expansion, but the speed decreases as it approaches the stroke end (at the time of maximum expansion). Since the force becomes large at the stroke end, if the state is set at the time of pressurization, a large pressing force can be obtained.

  In such a press apparatus, the present invention divides the screw rod into left and right, and interposes an elastic body that receives an axial load applied to the divided left and right screw rods. The left and right screw rods are supported so as to slide in the axial direction when a predetermined force is applied, and when the base of the pressurizing unit receives a predetermined drag from the object to be pressed during pressurization, The drag is transmitted to the left and right screw rods through the arm and female screw body forming the pantograph, and slides them. For this reason, the elastic body receives a load as a drag force from both screw rods, but the elastic body also applies an elastic force to both screw rods against it, so that the elastic force acts as a pressurizing force. become. In particular, if the rotation of the screw rod is stopped at a predetermined sliding position (for example, if the actuator of the drive system is a motor, it is stopped or braked), the elastic force of the elastic body is used as a pressurizing force that maintains the pressurized state. Works.

  Here, since the drag from the pressurized object is transmitted to both screw rods through the pantograph, the distributed drag is indirectly transmitted to the elastic body, and the load is reduced. Yes.

  By the way, when the pressurization state of a predetermined pressurizing force is maintained using the elastic force of the elastic body described above, it is necessary to grasp the pressurizing force at that time. In general, a pressure detector such as a load cell may be used. However, in the configuration of the present invention, it is also possible to grasp the applied pressure from the sliding amount of the screw rod (the amount of variation in position, that is, the amount of deviation). is there. That is, the sliding amount of the screw rod varies according to the pressure to be applied while receiving the action of the drag force from the object to be pressed and the elastic force applied from the elastic body, and therefore the corresponding value is set in advance. If calculated, the applied pressure can be measured from the sliding amount of the screw rod. Accordingly, the invention according to claim 2 is provided with a measuring means for measuring the sliding amount of at least one of the left and right screw rods and grasping the applied pressure from the sliding amount measured by the measuring means. According to this structure, it becomes a very low-cost structure with respect to the structure using expensive pressure detectors, such as a load cell.

  In the present application, the terms “upper, lower, left, and right” are used for convenience to indicate that the configurations in which they are used are symmetrical with each other. For example, in an actual form, the press direction is horizontal. In this case, the two bases are arranged horizontally and the positions of both screw rods are arranged vertically (the two bases are separated horizontally by the expansion and contraction of the pantograph). In this application, the positional relationship between both bases is up and down, and the positional relationship between both screw rods is left and right.

  As described above, the press device according to the present invention employs a pantograph-type press mechanism, so that the elastic force of the elastic body is sufficient and effective as a pressurizing force particularly when maintaining a pressurized state. It can be used for.

  In addition, the elastic body receives a load from the screw rod forming the pantograph and does not directly receive a load from the object to be pressed. Therefore, compared with the technique disclosed in Japanese Patent Laid-Open No. 10-128777, the elastic body has a higher strength. Even lower ones can be applied, the device can be simplified and the cost can be reduced, and the service life can be improved.

  Specific embodiments of the invention according to the present application will be described with reference to the drawings. Of course, the present invention is not limited to the following embodiments.

  FIG. 1 is an overall view of a press apparatus according to this embodiment, FIG. 2 is an explanatory view of a movable part of the press apparatus, and FIG. 3 is a partial sectional view of the center of the movable part. As shown in the figure, the pressing device according to the present embodiment is configured so that the movable portion includes an internal thread body 3a, 3b screwed into the left and right screw rods 2a, 2b and upper and lower bases 4a, 4b with arms 5a to 5b. Connected at 5d to form a quadrilateral link that becomes a pantograph, and the left and right screw rods 2a, 2b are rotated by the drive system, so that the bases 4a, 4b are separated from each other and the lower bases 4a, 4b move It is a mechanism to press in. Details will be described below.

  1 is an apparatus frame, 10 is a top plate frame, 11 is a side plate frame, and 12 is a back plate frame. An upper base 4a constituting a movable part described later is fixed to the lower surface of the top frame 10, while an end of the lower base 4b constituting the movable part is slid on the upper inner side of the back plate frame 12. A guide rail 12a for moving is formed. With this configuration, when the pantograph expands and contracts, the lower base 4a moves up and down along the guide rail 12a without tilting.

  The movable part arranged in the apparatus frame 1 includes left and right screw rods 2a and 2b, a pair of female screw bodies 3a and 3b screwed to the left and right screw rods, and upper and lower bases 4a and 4b. The four arms 5a to 5d that connect them, a compression spring 6 that is an elastic body that imparts an elastic force to the object to be pressed at the time of pressurization, and a spring case 7 that is a casing of the compression spring 6 And a support frame 8 that supports the screw rods 2a and 2b together with the spring case 7. The arms 5a to 5b are arranged symmetrically on the front and rear of the movable part with the screw rods 2a and 2b in the center (pantographs are formed on the front and back, and the upper and lower bases 4a and 4b are also respectively attached to the arms 5a and 5b in the front and rear. Connected).

  As shown in FIG. 2, the support frame 8 of the movable part includes a beam frame 80 arranged in parallel with the screw rods 2a and 2b in front of the movable part, and two pieces extending from the beam frame 80 to the rear of the movable part. Arm frames 81 and 82, and a rear frame 83 for connecting the arm frames 81 and 82 rearward. The beam frame 80 has two guide grooves 80a on the right and left sides through which pins 35 (only on the front side) for connecting female screws 3a and 3b and arms (5a and 5c, 5b and 5d) described later can be inserted and slid. It has been cut. As shown in FIG. 3, the two arm frames 81 and 82 are provided with bearings 81a and 82a for supporting the spring case 7 at portions intersecting with the spring case 7 to be described later, respectively. The shafts of the transmission gears 90 and 93 are rotatably supported (the gear 93 is omitted in FIG. 2B).

  The spring case 7 supported by the arm frames 81, 82 of the support frame 8 via bearings 81a, 82a is a means for storing the compression spring 6 in the hollow portion 72 in the case, and the left and right screw rods 2a, 2b. It is a means to divide. That is, as shown in FIG. 3, the left screw rod 2a is slidably inserted into an insertion hole 70a formed in one end 70 of the spring case 7, while the right screw rod 2b is inserted into the other end of the spring case 7. The side end 71 is fixed so as to have the same axis as that of the insertion hole 70a. Thus, when one screw rod is divided through the spring case 7, the same form is obtained.

  The left screw rod 2a is inserted with a disc spring, which is a compression spring 6, with its inserted distal end protruding into the hollow portion 72 in the spring case 7, and at the other end of the compression spring 6 at the distal end. An abutting spring seat 73 is attached. One end side of the compression spring 6 is in contact with a spring seat 72a fixed to one end side wall surface of the hollow portion 72 in the spring case 7. When the compression spring 6 is compressed, the one end side spring seat 72a and the other end side come into contact with each other. An elastic force as a drag force is applied to the spring seat 73. Here, the compression spring 6 is compressed when it receives an axial load applied to the left and right screw rods 2a, 2b, and the load is applied from a pressurizing object 60 generated during pressurization as described later. The drag of Since this drag is transmitted through the member forming the pantograph, the compression spring 6 is configured to receive the distributed drag indirectly. In order to arrange the compression spring 6 in the hollow portion 72 in the spring case, the spring case 7 is divided into the other end side 71 forming the hollow portion 72 and the one end side 70 corresponding to the lid body. Both 70 and 71 are integrated by screwing the contact portion.

  A gear 9 that meshes with a transmission gear 90 that is rotated by a drive system is fixed to the center of the spring case 7. A protrusion (not shown) is formed in the insertion portion of the left screw rod 2a, while an axial groove (not shown) in which the protrusion is fitted is cut on the inner peripheral surface of the insertion hole 71a of the spring case 7, In a state where the tip end side of the left screw rod 2a is inserted into one end side 70 of the spring case 7, the projection is slidably fitted into the axial groove thereof, whereby the left screw rod 2a is attached to the spring case 7. On the other hand, it becomes slidable. Further, as described above, the spring case 7 is supported by the bearings 81a and 82a disposed on the arm frames 81 and 82 so as to be rotatable and slidable when a predetermined force is applied in the axial direction. With these configurations, when the gear 9 is rotated by the drive system, the left and right screw rods 2a, 2b rotate integrally with the spring case 7. Further, when a predetermined axial load is applied to the left and right screw rods 2a and 2b, the left and right screw rods 2a are balanced by the balance between the load applied to the left and right screw rods 2a and 2b and the elastic force of the compression spring 6. , 2b are slid to each other so that the left screw rod 2a and the spring case 7 are in contact with each other. Here, the sliding amount (deviation) of the left screw rod 2a at this time can be used as a numerical value for grasping the pressing force of the press device as described above. Therefore, as a means of measuring the amount of sliding, a distance measuring photosensor 20 is attached to the end of the arm frame 81 on the left screw rod 2a side, and fixed to the portion of the left screw rod 2a adjacent thereto via a bearing. The detected detector 21 (sliding with the screw rod but fixed while preventing rotation) is detected to calculate the sliding amount (displacement) of the left screw rod 2a, thereby grasping the applied pressure. It goes without saying that another sensor may be used as the sliding amount measuring means.

  Female screw bodies 3a and 3b that are movable by rotation thereof are screwed into the left and right screw rods 2a and 2b, respectively. As shown in FIG. 2, the female screw bodies 3a and 3b have female screw holes 30a and 30b that are screwed into the male screws of the screw rods 2a and 2b in the center thereof, and arm connecting portions A at the front and rear thereof. , B are formed. Each of the arm connecting portions A and B is formed with a fitting insertion cut having a width capable of fitting the tip of the two arms and a pin hole penetrating each fitting insertion cut. A pin hole is formed in each fitting insertion cut. With the tip of the two arms (5a and 5c, 5b and 5d) provided, the pin 35 is inserted through each pin hole and fixed (as mentioned above, the front connection The pin 35 of the part A is also inserted through the guide groove 80a of the beam frame 80), and the two arms (5a and 5c, 5b and 5d) are rotatably pinned. The other ends of these arms 5a to 5d are also rotatably pinned to upper and lower bases 4a and 4b, which will be described later, whereby the four-sided link is formed by the four arms 5a to 5d on the upper, lower, left and right sides of the screw rods 2a and 2b. Both of them form a pantograph in which the quadrilateral link expands and contracts by the movement of the female screw bodies 3a and 3b due to the rotation of the screw rods 2a and 2b. The corresponding front and rear arms (front 5a and rear 5a, similarly front 5b and rear 5b, front 5c and rear 5c, front 5d and rear 5d) are connected by link bars 50, respectively. Has been.

  The bases 4a and 4b are positioned at the top and bottom of the pantograph by being connected to the other ends of the arms 5a to 5d at a total of four locations, ie, two in the front and rear. As described above, the upper base 4a is fixed to the lower surface of the top plate frame 10. On the other hand, in this embodiment, the lower base 4b serves as a pressure plate of the pressure unit and can be moved up and down by the expansion and contraction operation of the pantograph. However, the lower base 4b has a guide rail for the back plate frame 12 at its rear end. Since the rail block 40 fitted to 12a is attached, as described above, the vertical movement is performed along the guide rail 12a. Various attachments (for example, a pushing piston) required for pressing may be further fixed to the lower base 4b that is a pressurizing unit.

  In this embodiment, an electric motor 94 is used as the drive system actuator. The electric motor 94 is mounted on a shelf 91 provided on the outer surface of the back plate frame 12 of the apparatus frame 1 and is attached to a link 92 that follows the vertical movement of the movable portion, as shown in FIG. A rotational force is applied to the transmission gears 90 and 93 by the supported pulley and belt, and a rotational force is applied to the gear 9 engaged with the transmission gear 90.

  Next, the press operation configured as described above will be described. In the state before pressurization, the pantograph is expanded and contracted, and the lower base 4b is raised (closest to the upper base 4a). When applying pressure, place the object 60 to be pressed under the press stand, start the electric motor 90 to drive the drive system, and rotate the gear 9 to rotate the gear 9 together with the left and right screw rods. 2a and 2b rotate, and the internal thread bodies 3a and 3b move so as to approach each other. As a result, the pantograph expands in the vertical direction, and the lower base 4b descends along the guide rail 12a. Thereafter, the lower base 4b comes into contact with the pressurized object 60. In this state, if the rotation of the screw rods 2a and 2b is continued, the pressurizing object 60 can be pressed.

  In this pressed state, a load as a drag force against the pressurization object 60 is applied to the lower base 4b, which pushes up the lower base 4b and tries to reduce the pantograph, so the left and right screw rods 2a, 2b is subjected to axial forces that move away from each other, and as such, they slide and shift in position. At this time, since a compressive force is applied to the compression spring 6 in the spring case 7, the compression spring 6 imparts an elastic force against the left and right screw rods 2a, 2b. Therefore, as described above, when the electric motor 90 is stopped at a predetermined sliding position of the screw rods 2a and 2b when the desired pressure state is to be maintained, the elastic force of the compression spring 6 is reduced. This acts as a force for maintaining the pressurized state.

  Here, in order to grasp the desired pressure state, the sliding amount (deviation amount) of the screw rod 2a by the photosensor 20 may be based on the measured value, and therefore, the sliding amount corresponding to the desired applied pressure was measured. Sometimes the electric motor may be stopped.

  Although the present embodiment is as described above, the present invention is not limited to the above-described embodiment, and this is also as described above. As an elastic body, other means such as a compression coil spring or rubber, or a tension spring is used. Etc. may be used. However, when using an elastic force as a tensile force, such as a tension spring, for example, an elastic body is arranged between the left and right screw rods, and the device configuration is such that the elastic body is pulled from both sides. In general, the present invention can be applied to a configuration having a sufficient arrangement space.

  The present invention can be applied as various press devices that pressurize an object.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the whole press apparatus, (a) is a front view, (b) is a side view (however, the side plate is abbreviate | omitted). It is explanatory drawing of a movable part, (a) is a front view, (b) is a top view (however, the upper and lower bases are abbreviate | omitted). It is the fragmentary sectional view which showed the detail of the spring case among movable parts. It is a structural diagram of the prior art disclosed in Japanese Patent Laid-Open No. 10-128777.

Explanation of symbols

1 Equipment frame
2a, 2b threaded rod
3a, 3b Female thread body
4a Upper base
4b Lower base (Pressure plate)
5a-5d arm
6 Compression spring
7 Spring case

Claims (2)

Upper and lower bases, at least one of which is a pressure part,
A screw rod that is rotatably supported and supported so as to be slidable in the same direction when a predetermined force is applied in the axial direction;
A pair of female screw bodies that are screwed to the screw rods by their rotation;
It consists of an arm that forms a quadrilateral link that becomes a pantograph by connecting each female screw body and the upper and lower bases,
The screw rod is divided into right and left so that the female screw body is screwed together, and
An elastic body that receives the axial load applied to the left and right screw rods from both sides is interposed,
When the left and right screw rods are slid with a predetermined force applied in the axial direction thereof, a force against the sliding direction is applied to the left and right screw rods from the elastic body. Mold press machine.   2. The pantara type press device according to claim 1, further comprising a measuring unit that measures a sliding amount of at least one of the left and right screw rods, and grasping the applied pressure from the sliding amount measured by the measuring unit.

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