JPS6347525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-dimensional transfer device that uses a DC servo motor as a power source.

A transfer device installed in a conventional transfer press obtains its drive source from the transfer press via gears, link mechanisms, and the like. For this reason, when changing the stroke length of the feed, clamp, and lift operations, the only way is to add a cam or the like, which makes the structure complicated and makes it difficult to change the time steplessly. In addition, it is difficult to change the stroke start and end positions of each operation, the closed dimensions of the transfer lever and the height of the pass line cannot be adjusted steplessly, and each operation cannot be performed independently. There were problems such as difficulty in inspection and maintenance.

The present invention has been made with the aim of improving this problem, and provides a transfer device in which each of the feed, clamp, and lift operations can be performed simultaneously or independently using a DC servo motor as the drive source. , which allows stepless adjustment of each movement, and also allows changes such as stroke length with a simple structure.

An embodiment of the present invention will be described in detail below with reference to the drawings. In the figure, 1 is the upright of the transfer press, 2 is the moving bolster, and 3 is the transfer device. The transfer device 3 has two transfer bars 4 (not shown) parallel to the conveyance direction of the workpiece between the uprights 1.
A feed mechanism 6, a clamp mechanism 7, and a lift mechanism 8 are housed in a case 5 at one end of these transfer bars 4, and a clamp mechanism 7 and a lift mechanism similar to the above are housed in the case 5 at the other end. 8 is accommodated.

Next, each mechanism will be explained in order.

Each of the transfer bars 4 is divided into three parts, a central member 4a and both end members 4b and 4c, and each connection part is detachably connected by a connecting means (not shown), and is located on the workpiece delivery side (right side in Figure 1). A case 5 having a recess 5a in the workpiece transport direction is provided below both end members 4c, and a product delivery conveyor 71 is disposed in the recess 5a of the case 5. A feed mechanism 6 is housed in. The above feed mechanism 6
is a feed motor 10 consisting of a DC servo motor.
The rotation of the feed motor 10 is decelerated by a speed reducer 9 and then transmitted to one end of a rotating shaft 12 via a power transmission mechanism 11 such as a timing belt. The rotating shaft 12 is supported horizontally in a direction orthogonal to the transfer bar 4, and pinions 14 that mesh with racks 13 are fixed to both ends thereof. The rack 13 is fixed to the bottom of the carrier 15 parallel to each transfer bar 4. The carriers 15 are provided on both end members 4c sides, are supported by guide rods 16 laid parallel to each transfer bar 4, and are movable along these guide rods 16. Another guide rod 17 is provided in a direction perpendicular to the guide rod 16, and small carriers 18 are supported on these guide rods 17.
9 is provided protrudingly. The guide pins 19 are formed to be longer than the lift amount of the transfer bar 4, and the workpiece unloading side ends of both end members 4c are passed through these guide pins 19 so as to be vertically slidable. In addition, 50 in the figure is a cam for overrun detection, and 51
52 is a non-contact switch, and 52 is a detector such as Celsin for obtaining a synchronizing signal for controlling the feeder.

Further, the clamp mechanism 7 and the lift mechanism 8 are housed in a case 5b provided between each upright 1. The clamp mechanism 7 has a clamp motor 20 made of a DC servo motor,
The rotation of the clamp motor 20 is decelerated by a reducer 21 attached to the bottom of the case 5b, and then input to a bevel gear mechanism 23 via a power transmission mechanism 22 such as a timing belt. An output shaft 23a of the bevel gear mechanism 23 is provided to protrude upward, and a pinion 24 is fixed to the output shaft 23a at the center between each transfer bar 4. Central member 4a
A rack 26 protruding from a carrier 25 attached to the side end is engaged from both ends. That is, the carrier 25 is supported by two guide rods 27 installed in a direction perpendicular to the transfer bar 4, so that it can move in the approaching and separating directions.
The racks 26 protruding alternately from the opposing surfaces of the carriers 25 are engaged with the pinion 24, so that the clamp motor 20 moves each transfer bar 4 in the direction of approach and separation, that is, in the direction of clamping and unclamping. At the end of the horizontal shaft 23b of the bevel gear mechanism 23, a cam 28 for detecting an overrun, a non-contact switch 29, and a detector 30 such as a celsin for obtaining a signal for clamp synchronization control are provided, respectively. There is.

On the other hand, the lift mechanism 8 housed in the case 5b has a lift motor 35 consisting of a DC servo motor.
is attached to the side of the case 5b, and the rotation of the lift motor 35 is decelerated by a reducer 36 and then transferred to a power transmission mechanism 3 such as a timing belt.
7 to one end of the equalizer shaft 38. The equalizer shaft 38 is a ball spline shaft and is provided in a direction perpendicular to the transfer bar 4. The center portion of the equalizer shaft 38 is rotatably supported by a bearing means 39, and pinions 40 are spline-engaged at both ends. Each of the above pinions 40
is provided in each carrier 25, and is engaged with a rack 41a formed on one of two guide rods 41, 42 that protrude downward from the bottoms of both end members 4b, 4c so as to be parallel to each other. There is. Each of the guide rods 41 and 42 passes through the inside of the carrier 25 in the vertical direction, supports each transfer bar 4 in a vertically movable manner, and has two guide rods protruding from each end member 4b and 4c. , one guide rod 41
The rack 41a is formed on the other side of the pinion 40, and the side surface of the pinion 40 of the other guide rod 42 is provided so as to be close to the pinion 40, and serves only to guide the vertical movement of the transfer bar 4. In addition, 43 in the figure is a cam for overrun detection, and 44
numeral 45 is a contactless switch, and numeral 45 is a detector such as Celsin which obtains a signal for lift synchronization control.

Then, the feed mechanism 6 and the clamp mechanism 7
Each motor of the lift mechanism 8 is controlled by a control means (not shown) by a synchronization signal output in synchronization with the operation of the transfer press, and operates the transfer bar 4 as described later.

On the other hand, reference numeral 60 in the figure denotes an overload protector device, which is provided at the support portions of both end members 4b and 4c of the transfer bar 4, and is constructed as follows. A pin 61a protrudes from the bottom surface of a pedestal 61 that is slidably attached to the lower part of each end member 4b, 4c, and this pin 61a is attached to the guide rod 41,
The lift guide 62 is rotatably supported between the guide rods 41 and 42 to which the upper end of the lift guide 62 is fixed. A box-shaped case 63 is provided at the bottom of one end of the pedestal 61, and within this case 63, an elastic body 64 such as urethane rubber is attached to a pair of pressing plates 6.
It is housed in a space between 5 and 5. The tip of a bolt 66 screwed into the case 63 is in contact with the rear surface of one of the pressing plates 65, and by tightening this bolt 66, the elastic body 64 can be pressurized. , the opposite pressure plate 65
is in contact with a ball 67 that engages with a recess 62a formed on the end surface of the lift guide 62 from the case 63 side, and due to the elasticity of the elastic body 64,
The ball 67 is pressed against the lift guide 62.

Reference numeral 70 in the figure is a rest device on which the central member 4a of the divided transfer bar 4 is placed and pulled out of the press together with the moving bolster 2 when replacing the mold.

Next, the operation of each part will be explained with reference to FIG. 12. When a workpiece to be processed by the transfer press is carried in from the left side of FIG. The clamp motor 20 is rotated by the control signal. The rotation of the clamp motor 20 is transmitted to the bevel gear mechanism 23 via the reducer 21 and the power transmission mechanism 22, and a pinion 24 provided at the center between each transfer bar 4 is rotated. As a result, the carriers 25 of the clamp mechanism 7 are moved toward each other along the guide rod 27 via the rack 26 meshed with the pinion 24, and the transfer levers 4 and 4 supported by these carriers 25 are moved toward each other. The small carrier 18 of the feed mechanism 6 provided at the end of the workpiece unloading side is also moved in the same direction. Fingers (not shown) are attached to each transfer bar 4 at positions facing each other, and the workpiece is clamped between the fingers by the clamping operation of the transfer bar 4.

When the clamping of the workpiece is completed, a control signal is output from the control means to the lift motor 35, and the lift motor 35 is thereby rotated. The rotation of the lift motor 35 is controlled by a reducer 36 and a power transmission mechanism 37.
is transmitted to the equalizer shaft 38 via a pinion 40 splined to the equalizer shaft 38 to rotate. These pinions 40 have guide rods 4
1 rack 41a is engaged, and the pinion 4
0, the transfer bar 4 is raised via the guide rod 41. At this time, the guide rod 42 on the side that is not engaged with the pinion 40 supports the reaction force generated when the pinion 40 and the rack 41a are engaged, and enables smooth vertical movement of the transfer bar 4.

The work clamped between the fingers by the lift operation is lifted to a predetermined height together with the transfer bar 4, and thereafter the feed motor 10 starts rotating in response to a control signal output from the control means. The rotation of the feed motor 10 is transmitted to the rotating shaft 12 via the reducer 9 and the power transmission mechanism 11, and a pinion 14 attached to the rotating shaft 12
As a result, the carrier 15 of the feed mechanism 6 is moved to the right along the guide rod 16 via the rack 13, and the transfer bar 4 connected to the carrier 15 via the guide pin 19 is also moved to the right for advance operation. At this time, the lift mechanism 8
The cradle 61 and the transfer bar 4 slide,
The transfer bar 4 is allowed to move. When each transfer bar 4 reaches the advance end, the feed motor 10 is stopped, the lift motor 35 is reversed, and the transfer bar 4, which has been in the raised position, is lowered. Transferba 4
When the lowering of the transfer levers 4 is completed, a control signal is outputted from the control means to the clamp motor 20, the clamp motor 20 is reversed, and the transfer bars 4 are moved in a direction away from each other to enter an unclamping operation. By the above-mentioned unclamping operation, the workpiece clamped between each finger is unclamped, and at the end of unclamping, the feed motor 10 is reversed, and each transfer bar 4 is moved to the left to the position where the workpiece was initially clamped. Return to. Thereafter, the above operations are repeated to carry in the workpiece and transport the workpiece between each processing station. Further, the processed workpiece is carried out from the transfer press by a product carrying-out conveyor 71 installed on the workpiece carrying-out side.

The above is the work transfer operation by the transfer device 3. However, if an overload acts between the transfer bars 4 during clamping, the overload protector device 60 works as follows to prevent the transfer bars 4, etc. from being overloaded. More protection. During normal operation, the ball 67 pressurized by the elastic body 64 is fitted into the recess 62a of the lift guide 62, and the transfer bar 4 and the lift guide
However, when an overload is applied to the transfer bar 4 during clamping, the transfer bar 4 rotates around the pin 61a. As a result, the ball 67 comes out of the recess 62a of the lift guide 62, so that the transfer bar 4 can freely rotate about the pin 61a, and overload on the transfer bar 4 is avoided.

As described in detail above, the present invention includes a feed mechanism that feeds and returns a transfer server;
The clamp mechanism for clamp-unclamp operation and the lift mechanism for lift operation are made independent, respectively.
In addition, since a DC servo motor is used as the drive source, and these motors are controlled simultaneously by a control device, the feed speed is significantly lower than in the conventional case where the driving force was obtained from the transfer press using gears or link mechanisms. , the stroke length during clamp lift operation, the closed dimensions of the transfer lever, the feed line height, etc. can be adjusted steplessly.
The stroke start angle and end angle can also be easily changed. In addition, since there is no need to mechanically interlock each mechanism, the overall structure is simplified, and each mechanism can operate independently, so the transfer bar can be divided and moved in and out together with the moving bolster, and molds and fingers can be moved. Conversion work can be done more efficiently and in a shorter time than with conventional methods. Moreover, by standardizing and manufacturing each independent mechanism in advance, even if the length of the transfer bar changes depending on the size of the press, it can be accommodated by simply changing the length of the central member. Compared to the conventional method of designing and manufacturing a new transfer device every time the size of the press changes, the production period can be significantly shortened, and testing after each mechanism is assembled can be done independently for each mechanism. This has the effect of significantly reducing the number of man-hours required for testing, compared to conventional methods in which the entire assembly is assembled and tested.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall perspective view, FIG. 2 is a cross-sectional view of the feed mechanism, FIG. 3 is a longitudinal sectional view thereof, and FIG. 4 is a cross-sectional view of the feed mechanism.
5 is a cross-sectional view of the clamp and lift mechanism, FIG. 6 is a vertical sectional view thereof, FIG. 7 is a sectional view taken along the line of FIG. 6, and FIG. 8 is a sectional view of the clamp and lift mechanism.
9 is a plan view of the overload protector device, FIG. 10 is a longitudinal sectional view thereof,
Figure 11 is a sectional view taken along the arrow XI-XI line in Figure 10;
FIG. 12 is an explanatory diagram of the operation. 1 is an upright, 4 is a transfer lever, 6 is a feed mechanism, 7 is a clamp mechanism, 8 is a lift mechanism, 10 is a feed motor, 20 is a clamp motor, and 35 is a lift motor.

Claims (1)

[Claims] 1 Between each upright 1 of the transfer press,
A pair of transfer bars 4 are provided parallel to each other along the conveyance direction of the workpiece, and these transfer bars 4 are divided into a central member 4a and both end members 4b, 4c, and are arranged below each end member 4b, 4c. A box-shaped case 5 is provided, and a feed mechanism 6, a clamp mechanism 7, and a lift mechanism 8, which are each independent and driven by a dedicated DC servo motor, is installed in one of the cases 5, and a clamp mechanism 7 and a lift mechanism 8 are installed in the other case 5. houses a clamp mechanism 7 and a lift mechanism 8 that are paired with the clamp mechanism 7 and lift mechanism 8, and these feed mechanisms 6, clamp mechanisms 7, and lift mechanisms 8 move the transfer bar 4 in advance, return directions, clamping, A three-dimensional transfer device that is driven in an unclamping direction and a lift-down direction, and in which driving sources provided in each of the mechanisms 6, 7, and 8 are synchronously controlled by a control means.