JPH0232055B2 - TORANSUFUASOCHINIOKERUFUIIDOBAANOYUATSUSHIKIDOCHOSOCHI - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a hydraulic system that opens and closes parallel feed bars or horizontally raises and lowers two parallel feed bars constituting a transfer device of a press machine, for example, in manual operation. This invention relates to a type tuning device.

[Background Art and Problems Therewith] FIG. 1 is a plan view of a press machine that employs a transfer device. A workpiece is pressed by an upper die of the slide (not shown) and a lower die 2 of the bolster 1, as the slide is moved up and down by a crankshaft. Above the bolster 1, two feed bars 3 are arranged in parallel, the longitudinal direction being in the left-right direction, and these feed bars 3 are attached to the mounting member 3A.
Mounted and supported. During automatic operation when pressing a workpiece, the feed bar 3 operates in conjunction with the crankshaft. Specifically, in the two-dimensional transfer device, the feed bars 3 move close to each other to clamp the workpiece with the fingers 4, and then move forward by a predetermined stroke to transfer the workpiece to the next process, and then open and move. After unclamping the workpiece, move back and return to the previous process. In the three-dimensional transfer device, the feed bar 3 rises after the closing movement, then advances and descends, and after the opening movement,
fall back. In this way, in the three-dimensional transfer device, the raising and lowering of the feed bar is added to the two-dimensional transfer device.

In contrast to the automatic operation described above, manual operation is performed in which only the feed bar is opened, closed, raised and lowered separately from other members and mechanisms of the press machine, for example, for mold setup work such as mold exchange and mold adjustment.

In this manual operation, in order to quickly perform mold setup work, etc., it is necessary to move both the left and right sides of the feed bar by the same amount at the same time, and perform opening/closing and lifting/lowering movements by synchronized movements on both sides. It is. In a press machine equipped with an equalizing shaft for synchronizing the feed bar, the equalizing shaft allows synchronized movement of both left and right sides of the feed bar.

However, as with C-frame press machines, inserting an equalize shaft into the frame reduces frame rigidity, and because the equalize shaft normally runs left and right behind the bolster, it becomes difficult to discharge scrap generated during press processing. Some press machines are not equipped with an equalize shaft due to problems such as sagging.

FIG. 4 shows a conventional feed bar drive device constituting a transfer device of a press machine that is not equipped with an equalizing shaft. Since the transfer device of this press machine is a three-dimensional device, the feed bar drive device includes an opening/closing drive mechanism that opens and closes the two feed bars and an elevation drive mechanism that moves the two feed bars up and down. Note that a forward/backward drive mechanism including a gear mechanism and a cam mechanism for advancing and retracting the feed bar is not shown because it is not directly related to the present application. Fourth
The feed bar drive device shown in the figure is incorporated in control boxes 5 and 6 at both left and right ends of the bolster 1 shown in FIG. It is set in.

In FIG. 4, an opening/closing drive mechanism 7 for opening/closing the two feed bars 3 is constituted by a link mechanism 10 having two horizontal pivot shafts 8, 9. Two links 11, 12 and links 13, 14 are arranged on each swing center axis 8, 9, and these links 11, 12, 13, 14 are arranged in a vertical plane around the base axis 8, 9. can be swung. Link 11 and link 12 are coaxial,
Link 13 and link 14 are each integrated,
Further, the links 12 and 13, which are on different axes, are connected by connecting rods 15. The rod 17A of the piston 17 of the air cylinder 16 is attached to the pin 11 at the tip of the link 11 on the side of the swing center shaft 8.
It is pivoted at A. This air cylinder 16, which is assembled to the case 18 in a sideways horizontal position, is an air cylinder for opening and closing the feed bar. An end of a cam follower support 19 is pivotally connected to the tip of the link 14 on the other swing center shaft 9 side by a pin 14A. A roller 20 as a cam follower is rotatably attached to the cam follower support 19 around a shaft 20A. A plate-shaped cam body 21 serving as a cam member for this roller 20 rotates in a vertical plane around a shaft 22, and the shaft 22 is dynamically connected to the crankshaft that moves the slide up and down. The body 21 rotates in conjunction with the vertical movement of the slide.
Two guide protrusions 1 protrude in an angular shape from a cam follower support 19 to the upper and lower surfaces of a block-shaped guide member 23 rotatably provided on the shaft 22.
9A is slidable, and the cam follower support 19 can be moved left and right in FIG. 4 by the guiding action of the guide member 23 and the guide protrusion 19A. Shaft 22 and guide member 2
3 serves to specify the operation of the cam follower support 19 by the cam mechanism.

Arms 24 and 25 are connected to the swing center shafts 8 and 9.
These arms 24, 25, which extend upwardly and are swingable in a vertical plane about axes 8, 9,
1 and 12 and links 13 and 14 at the base. Long grooves 24A, 25A having lengths in the vertical direction are formed in the upper parts of the arms 24, 25,
The feed bar mounting member 3A shown in FIG. 1 is coupled to the upper surfaces of the bridge members 26, 27 which are slidably engaged with the long grooves 24A, 25A.

An elevating drive mechanism 28 for elevating and lowering the two feed bars 3 includes an air cylinder 29 installed upward on the lower surface of the case 18. This air cylinder 29 is an air cylinder for raising and lowering the feed bar, and the tip of the rod 30A of the piston 30 projects into the case 18. In case 18 there are 2
A lifting rod 31 parallel to the book is provided, and the lifting rod 31 can move up and down while being guided by guide boss portions 18A and 18B of the case 18. The lower parts of the two lifting rods 31 are connected by a connecting member 32, and this connecting member 32
A roller 33 as a cam follower is attached to the side of the shaft 3.
It is rotatably installed at 3A. The central axis of rotation of the plate-shaped cam body 34 serving as a cam member for this roller 33 is the central axis of rotation 22 of the cam body 21, and therefore, this cam body 34 also rotates in conjunction with the vertical movement of the slide. do. Two upper and lower guide bars 35 are held horizontally by a holding member 31A at the top of the lifting rod 31, and these guide bars 35 are inserted through the bridge members 26 and 27.

During automatic operation to press work, the air chambers 16 of the two air cylinders 16 and 29
Supply air to A and 29A. By supplying air to the air chamber 16A, the piston rod 17A of the air cylinder 16 moves forward, so that the links 11,1
2 swings clockwise in FIG.
It swings counterclockwise in the figure. Therefore, the cam follower support 19 is moved to the left, and the roller 20 is brought into contact with the cam body 21, and this contact is made during automatic operation by the pressing force of the piston 17 of the air cylinder 16 that receives air pressure from the air chamber 16A. Continued. Link 1
1 and 12 perform the above-mentioned swing, the arm 24 moves clockwise in FIG.
4 performs the above-mentioned swing, the arms 25 swing in the counterclockwise direction in FIG. 4 about the axis 9, and as a result,
The bridge members 26 and 27 approach each other while being guided by the guide bar 35, and the two feed bars 3 close to a predetermined distance. When the cam body 21 rotates in conjunction with the slide, the roller 20 and the cam follower support 19 follow the shape of the cam body 21 and move left and right in FIG. By swinging about the shafts 8 and 9, the two feed bars 3 perform opening/closing movements for clamping and unclamping the work from the predetermined distance.

On the other hand, as air is supplied to the air chamber 29A, the piston rod 30A and the connecting member 32 rise, and the roller 33 comes into contact with the cam body 34. This contact is continued during automatic operation by the pressing force of the piston 30 that receives air pressure from the air chamber 29A. Connecting member 3
2, the lifting rod 31 and the guide bar 35 also rise, and the bridge members 26 and 27 are lifted along the long grooves 24A and 25A of the arms 24 and 25, so that the two feed bars reach a predetermined height. When the cam body 34 rotates in conjunction with the slide,
The roller 33, the connecting member 32, the lifting rod 31, and the guide bar 35 move up and down following the shape of the cam body 34,
As a result, the two feed bars 3 move up and down.

The closing movement of the feed bar in automatic driving as described above,
The order of raising, lowering, and opening movements is determined by the shapes of the cam bodies 21 and 34 according to press working.

When opening the two feed bars 3 in manual operation for mold setup work, etc., air is supplied to the air chamber 16B of the air cylinder 16 to retract the piston rod 17A. This will cause link 1
1, 12 and arm 24 swing counterclockwise in FIG. 4 around shaft 8, and links 13, 14 and arm 25 swing clockwise around shaft 9 in FIG. opens and moves. When closing the two feed bars 3 during manual operation, air is supplied to the air chamber 16A of the air cylinder 16 to advance the piston rod 17A, and the links 11, 1
2, 13, 14 and arms 24, 25 to perform operations opposite to those described above. When lowering the feed bar 3 during manual operation, the air supplied to the air chamber 29A of the air cylinder 29 is discharged, and the piston rod 30A, connecting member 32, lifting rod 31,
The guide bar 35 is lowered by its own weight, and the bridge members 26, 27 are lowered along the long grooves 24A, 25A, thereby lowering the feed bar 3. When raising the feed bar 3 during manual operation, air is supplied to the air chamber 29A of the air cylinder 29, and the piston rod 30A and the connecting member 3
The feed bar 3 is raised by the rise of the second grade.

The opening/closing movement and elevating movement of the feed bar 3 in the above manual operation are performed by the opening/closing drive mechanism 7 and the elevating drive mechanism 2 provided on the left and right sides of the feed bar 3, respectively.
8 on both the left and right sides of the feed bar 3. In order for the left and right sides of the feed bar 3 to open/close and move up and down in synchrony, the pistons 1 of the air cylinders 16 and 29 of the left and right opening/closing drive mechanisms 7 and the up/down drive mechanism 28 of the feed bar 3 are required.
7 and 30 must move at the same time and at the same speed. Conventionally, such piston movement is
Air chambers 16A, 16 of air cylinders 16, 29
B, 29A or air chamber 16A,
When discharging air from 16B and 29A, this was done by controlling the air flow rate by operating a throttle valve provided in the air circuit.

However, in the conventional technology that achieves synchronized movement of both the left and right sides of the feed bar by controlling the flow rate of the air circuit, the throttle valve is operated by a throttle provided for each opening/closing drive mechanism on the left and right sides of the feed bar, and for each lifting drive mechanism. It is necessary to perform this operation on the valve, and this operation is troublesome because it has to be performed in consideration of fluid characteristics such as air pressure drop due to pipe friction loss. Therefore, one piston of the air cylinder that exists for each mechanism on the left and right side of the feed bar may move faster than the other piston, and as a result, the two feed bars may form a V-shape when opening and closing, or they may not move up or down. During movement, the mold tilts with respect to the horizontal plane, and it takes time to perform parallel opening/closing movements and horizontal lifting/lowering movements, making it difficult to quickly perform mold setup operations during manual operation.

[Object of the Invention] An object of the present invention is to be able to reliably operate the opening/closing drive mechanism or the lifting drive mechanism provided on the left and right sides of the feed bar at the same speed during manual operation, and therefore to operate the opening/closing drive mechanism or the lifting drive mechanism provided on the left and right sides of the feed bar at the same speed. Hydraulic synchronization device for feed bar in transfer equipment that can reliably move in synchronization, ensure parallel opening/closing movement, horizontal lifting/lowering movement, and improve work efficiency such as mold setup work. It's there to provide.

[Means and effects for solving the problem] For this reason, the configuration of the present invention consists of an opening/closing drive mechanism that opens and closes the two parallel feed bars provided on the left and right sides of the feed bar, and a lifting drive mechanism that moves the two parallel feed bars up and down. In a transfer device including at least an opening/closing drive mechanism, at least one of the opening/closing drive mechanism and the lifting drive mechanism is provided with a hydraulic cylinder, and a piston of the hydraulic cylinder is connected to a movable member of the mechanism. The piston is moved in conjunction with the movable member, and the two hydraulic cylinders provided for each mechanism on the left and right sides of the feed bar are connected by two pipes, and this connection is connected to the hydraulic pressure divided by the piston. By making a cross connection in which the two oil chambers inside the cylinder communicate with the other oil chamber of the other hydraulic cylinder, the pistons of the two hydraulic cylinders have different operating speeds between the left and right mechanisms of the feed bar. When there is a difference in movement speed, more oil is sent from the hydraulic cylinder of the piston that moves faster to the hydraulic cylinder of the piston that moves slower.
This averages out the piston speed and makes the operating speeds of the left and right mechanisms of the feed bar equal.As a result, both the left and right sides of the feed bar move by the same amount at the same time, making it possible to achieve synchronized movement on both sides. It has certain characteristics.

[Embodiment] FIG. 2 shows a feed bar drive device to which a hydraulic tuning device according to the present embodiment is applied. This feed bar drive device is for a transfer device of a press machine, and since this transfer device is a three-dimensional device, the feed bar drive device has an opening/closing drive mechanism that opens and closes two parallel feed bars, and a lifting mechanism. It also includes an elevating and lowering drive mechanism for moving. Of course, a forward and backward drive mechanism for moving the feed bar forward and backward is also provided, but it is omitted because it has no direct relevance to the present invention.

The feed bar drive device shown in FIG. 2 is the same as the feed bar drive device shown in FIG. 4 except for the hydraulic cylinder and its surroundings, which will be described later. Therefore, in the following explanation, for convenience of understanding, the fourth
The same reference numerals will be used for the same parts and mechanisms as those in the device shown in the figure, and the explanation of the feed bar drive device will only refer to the basic parts, etc.
Details are omitted.

That is, the opening/closing drive mechanism 7 has two pivot shafts 8,
9, an air cylinder 16 for opening and closing the feed bar is provided at one end of the link mechanism 10, and a roller 20 as a cam follower that comes into contact with a cam body 21 is provided at the other end of the link mechanism 10. It is attached to the cam follower support 19 and provided. the swing center shaft 8;
Arms 24 and 25 are disposed at 9 and integrated with links 11 and 12 and links 13 and 14, and feed bar 3 is attached to bridge members 26 and 27 that are engaged with long grooves 24A and 25A at the top of arms 24 and 25. Member 3A is attached. The elevating drive mechanism 28 includes an air cylinder 29 for elevating and lowering, and a piston rod 30A of the air cylinder 29 is connected to a connecting member 32 connecting two elevating rods 31 that are vertically movable with respect to the case 18. The connecting member 32 is provided with a roller 33 as a cam follower that is brought into contact with the cam body 34, and the cam body 21 and the cam body 34 have the same rotation center axis 22,
This shaft 22 is connected to a crankshaft that moves the slide up and down. Two guide bars 35 are held horizontally above the lifting rod 31, and these guide bars 35 are inserted through the bridge members 26, 27.

The opening/closing drive mechanism 7 and the lifting/lowering drive mechanism 28 described above are each incorporated in control boxes 5 and 6 at both left and right ends of the bolster 1 shown in FIG.

As shown in FIG. 2, a hydraulic cylinder 36 is mounted on the lower surface of the case 18 with the axial direction being the vertical direction, and the upper part of the rod 37A of the piston 37 projects into the case 18. This hydraulic cylinder 36 is a hydraulic cylinder for synchronized opening and closing of the feed bar. A link 38 is provided on the swing center shaft 9 of the link mechanism 10, and this link 38 is integrated with the links 13, 14 and the arm 25, which are movable members of the opening/closing drive mechanism 7. Link 1
3, 14, and the arm 25, it can swing around the shaft 9. The link 38 and the piston rod 37A of the hydraulic cylinder 36 are connected by a connecting member 39. As a result, the piston 37 of the hydraulic cylinder 36 is linked to the movable member of the opening/closing drive mechanism 7,
They are connected via a connecting member 39.

On the other hand, a hydraulic cylinder 40 is assembled and installed on the lower surface of the air cylinder 29 for lifting and lowering. This hydraulic cylinder 40 is a hydraulic cylinder for synchronized lifting and lowering. Since the air cylinder 29 and the hydraulic cylinder 40 are arranged vertically and coaxially, the air cylinder 29
The piston rod 30A of No. 9 also serves as the piston rod 41A of the hydraulic cylinder 40. In other words, in this embodiment, the air cylinder 29 and the hydraulic cylinder 40 are stacked in two stages, upper and lower, so that the piston rod can be shared. Due to this structure, the piston rod 3 of the air cylinder 29
The piston 41 of the hydraulic cylinder 40 is formed at 0A, and the piston rod 30A is a movable member of the elevating drive mechanism 28, so the piston 41 of the hydraulic cylinder 40 is connected to the movable member of the elevating drive mechanism 28.

These hydraulic cylinders 36 and 40 are arranged for each opening/closing drive mechanism 7 and each lifting drive mechanism 28 provided on the left and right sides of the feed bar.

Figure 3 shows the feed bar left and right opening/closing drive mechanism 7.
FIG. 3 is a piping diagram connecting hydraulic cylinders 36 and 40 provided for each lifting drive mechanism 28. The two synchronized opening/closing hydraulic cylinders 36 are connected to two pipes 42,
43, and two synchronized lifting hydraulic cylinders 40 are also connected by two pipes 44, 45. Inside each hydraulic cylinder 36, 40 is a piston 37, 41 and two oil chambers 36A, 36B.
The oil chambers 36A, 36B, 40A, and 40B are connected by the above-mentioned pipes 42, 43, 44, and 45 as a cross connection that alternately connects these oil chambers 36A, 36B, 40A, and 40B.

Specifically, the lower chamber 36B of the synchronized opening/closing hydraulic cylinder 36 on the left side L and the upper chamber 36A of the synchronized opening/closing hydraulic cylinder 36 on the right side R are connected to the conduit 42.
The upper chamber 36A of the synchronized opening/closing hydraulic cylinder 36 on the left side L and the lower chamber 36B of the synchronized opening/closing hydraulic cylinder 36 on the right side R are communicated via a conduit 43. Similarly, the lower chamber 40B of the left side L synchronized lifting hydraulic cylinder 40 and the lower chamber 40A of the right side R synchronized lifting hydraulic cylinder 40 are communicated with each other through a conduit 44, and the upper chamber 40B of the left side L synchronized lifting hydraulic cylinder 40 is communicated with Hydraulic cylinder 4 for synchronous lifting and lowering of chamber 40A and right side R
0 is communicated with the lower chamber 40B through a conduit 45. Here, regarding the synchronized opening/closing hydraulic cylinders 36 for both left and right L and R, when the two feed bars 3 close, the piston 37 moves toward the upper chamber 36A side, and when they open, the piston 37 moves toward the lower chamber 36B side. Move to. Regarding the synchronized lifting hydraulic cylinders 40 on both the left and right sides L and R, when the feed bar 3 rises, the piston 41 moves toward the upper chamber 40A side,
When descending, it moves to the lower chamber 40B side.

The distribution lines 42, 43, 44, and 45 are connected to the distribution line 4.
6, 47, 48, and 49 are connected, and these distribution lines 46, 47, 48, and 49 are connected to a hydraulic pump 52 via a source line 51. The oil sent from the hydraulic pump 52 passes through the pipes 42, 43, 44, 45 to the oil chambers 36A, 36 of the hydraulic cylinders 36, 40.
B, 40A, and 40B are filled. However, the check valves 53, 5 are installed in the distribution lines 46, 47, 48, 49.
4, 55, and 56 are provided, the pipe line 4
The backflow of oil from the 2, 43, 44, 45 side to the hydraulic pump 52 side is prevented by check valves 53, 54, 55, 56.

When the two feed bars 3 are closed during manual operation, that is, the air cylinder 1 in FIG.
Air was supplied to the air chamber 16A of No. 6 to advance the piston rod 17A, and the links 11 and 12 were swung clockwise around the shaft 8, and the links 13 and 14 were swung counterclockwise around the shaft 9. In this case, the link 38 swings counterclockwise around the shaft 9, so the piston rod 37A of the hydraulic cylinder 36 is pulled up, and as the piston 37 rises, the upper chamber 3
6A oil is extruded. This extruded oil flows through the pipe 42 or 43 and flows into the lower chambers 36B of the hydraulic cylinders on the opposite left and right sides. Even if the piston 37 moves, the oil chambers 36 of the two left and right hydraulic cylinders 36
Since the total volumes of A and 36B are the same, only oil flows in and out.

When the feed bar 3 is closed during manual operation, if there is a difference in the operating speed of the opening/closing drive mechanisms 7 provided on the left and right sides of the feed bar 3, in other words, the air cylinders 16 provided for each of the left and right opening/closing drive mechanisms 7 are different.
If the forward speeds of the piston rods 17 of the left and right air cylinders 16 are different due to insufficient throttle valve operation, the rising speeds of the pistons 37 of the left and right hydraulic cylinders 36 connected to the movable member of the opening/closing drive mechanism 7 will also be different. occurs. As a result, piston 3
The upper chamber 36 of the hydraulic cylinder 36 with a fast rising speed of 7
A large amount of oil will be delivered from A, but this delivered oil will flow into the lower chamber 36B of the hydraulic cylinder 36 where the rising speed of the piston 37 is slow.
The rising speed of this piston 37 becomes faster. Therefore, the pistons 37 of the left and right hydraulic cylinders 36 rise at the same speed, and the operating speeds of the left and right opening/closing drive mechanisms 7 become equal, so that both left and right sides of the feed bar 3 close in synchronized movement in parallel. will begin to do this. The above operation is the same when the feed bar 3 is opened.

As in the case of the opening/closing drive mechanism 7, the speeds of the pistons 30 of the left and right air cylinders 29 differed due to insufficient throttle valve operation for the air cylinders 29, and the operating speeds of the left and right lifting drive mechanisms 28 differed. In this case, the pistons 4 of the left and right hydraulic cylinders 40
1 will be different in speed. In this case as well, the speeds of the pistons 41 of the left and right hydraulic cylinders 40 are averaged because the oil is sent from the hydraulic cylinder 40 where the speed of the piston 41 is fast to the hydraulic cylinder 40 where the speed of the piston 41 is slow. Feed bar 3 due to equal operating speed of mechanism 28
The left and right sides move in synchrony, rising or falling horizontally.

Note that since oil is an incompressible fluid, the operating speed of the left and right opening/closing drive mechanisms 7 or the lifting/lowering drive mechanism 28 of the feed bar 3 can be made constant. Also,
The pistons 37 and 41 of the hydraulic cylinders 36 and 40 move not only during manual operation but also during automatic operation,
In this automatic operation, the opening/closing drive mechanism 7 and the lifting drive mechanism 28 are operated by the cam bodies 21 and 34, so there is a difference in the operating speed of the opening/closing drive mechanism 7 and the lifting drive mechanism 28 on the left and right sides of the feed bar 3. Never. Therefore, in this case, 2
Oil only flows into and out of the individual hydraulic cylinders 36 and 40, and the hydraulic cylinders 36 and 40 do not interfere with automatic operation. In some cases, oil may be discharged from the hydraulic cylinders 36 and 40 for automatic operation.

Since the transfer device according to the above embodiment was a three-dimensional device, it was provided with an elevating drive mechanism in addition to the opening/closing drive mechanism. However, the present invention is a two-dimensional transfer device that does not have an elevating drive mechanism. It is also applicable to In addition, in this embodiment, hydraulic cylinders are provided for both the opening/closing drive mechanism and the lifting/lowering drive mechanism, but if there is no risk of a difference in operating speed in one of these mechanisms, it is not necessary to install hydraulic cylinders in both mechanisms. There is no need to provide one. If necessary, a hydraulic cylinder may be provided in at least one of the opening/closing drive mechanism and the lifting/lowering drive mechanism. Furthermore, the opening/closing drive mechanism and the elevating drive mechanism to which the present invention is applied are not limited to those shown in the drawings, but may have any structure, and the present invention is applicable as long as it has a movable member that can be connected to the piston of the hydraulic cylinder. is possible.
Further, although this embodiment was applied to a transfer device of a press machine, the present invention can also be applied to a transfer device of other processing machines, such as a forging machine.

[Effects of the Invention] According to the present invention, during manual operation, it is possible to reliably operate the opening/closing drive mechanism and the lifting drive mechanism provided on the left and right sides of the feed bar at the same speed, and it is possible to operate both the left and right sides of the feed bar at the same time. Since the feed bar can be moved by a certain amount, and the synchronized movement of both the left and right sides allows the feed bar to open and close in parallel and move up and down horizontally, it is possible to easily and speed up work such as mold setup work.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a bolster portion of a press machine to which a device according to an embodiment is applied, FIG. 2 is a partially sectional side view showing a portion of a feed bar drive device,
FIG. 3 is a piping diagram of a hydraulic cylinder, and FIG. 4 is a partially sectional side view showing a conventional feed bar drive device. 3...Feed bar, 7...Opening/closing drive mechanism, 2
8... Lifting drive mechanism, 36... Hydraulic cylinder for synchronized opening/closing movement, 36A, 36B... Oil chamber, 37... Piston, 40... Hydraulic cylinder for synchronized lifting movement, 4
0A, 40B...Oil chamber, 41...Piston, 4
2, 43, 44, 45... pipe.

Claims (1)

[Claims] 1. In a transfer device equipped with an opening/closing drive mechanism that opens and closes two parallel feed bars on the left and right sides, the opening/closing drive mechanism is provided with a synchronizing hydraulic cylinder, and the piston of this hydraulic cylinder is moved. The two hydraulic cylinders connected to the movable member of the opening/closing drive mechanism and provided for each opening/closing drive mechanism on the left and right sides of the feed bar are connected by two pipes, and this connection is connected to a hydraulic pressure partitioned by the piston. A hydraulic tuning device for a feed bar in a transfer device, characterized in that two oil chambers inside the cylinder are cross-connected so that they communicate with the other oil chamber of the other hydraulic cylinder. 2. In a transfer device comprising an opening/closing drive mechanism that opens and closes the feed bars on the left and right sides of two parallel feed bars and an elevation drive mechanism that moves the feed bars up and down, the transfer device is tuned to at least one of the opening/closing drive mechanism and the elevation drive mechanism. A hydraulic cylinder is provided, a piston of this hydraulic cylinder is connected to a movable member of the mechanism, and the two hydraulic cylinders provided for each of the mechanisms on the left and right sides of the feed bar are connected by two pipes, A hydraulic synchronization device for a feed bar in a transfer device, characterized in that this connection is a cross connection in which two oil chambers inside the hydraulic cylinder partitioned by the piston communicate with the other oil chamber of the other hydraulic cylinder. .