JPS6350043Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lift mechanism for a transfer device that drives a transfer lever in a lifting direction.

Conventional cam-type lift mechanisms perform lift-up, stop, lift-down, and stop operations using a combination of cams, levers, links, and reaction air cylinders, but with this method, the lift length can be changed by adding a cam. This required mounting, the structure was complicated, and stepless adjustment was difficult.

Furthermore, with this method, it is impossible to change the feed line height, and at the same time, it is difficult to change the stroke start angle and end angle after assembly and delivery.

This invention was made with the aim of improving this problem, and by performing the lift operation of the transfer bar with a lift motor consisting of a DC servo motor, it is possible to change the lift length, feed line height, lift start angle, lift end angle, etc. In addition to making it easy to carry out the transfer, by providing a plurality of guide rods for each pinion, which support the transfer bar so as to be able to move up and down, and forming a rack in one of the rods so as to mesh with the pinion. The object of the present invention is to provide a lift mechanism for a transfer device that allows each transfer bar to move up and down smoothly.

An embodiment of this 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 conveyance direction is provided below both end members 4c, and a product delivery conveyor 71 is installed in the recess 5a of the case 5. A feed mechanism 6 is housed in. The above feed mechanism 6
has a feed motor 10 made of a DC motor, and the rotation of the feed motor 10 is decelerated by a 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 above is for each transfer bar 4.
It is fixed to the bottom of the carrier 15 so as to be parallel to the bottom of the carrier 15. 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 a small carrier 18 is supported on these guide rods 17, and a guide pin 19 is provided to protrude from the upper surface of this small carrier 18. The guide pins 19 are 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. Note that 5 in the figure
0 is a cam for overrun detection, 51 is the same non-contact switch, and 52 is a detector such as Sersin for obtaining a synchronization signal for feeder control.

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 motor, and the rotation of the clamp motor 20 is decelerated by a reducer 21 attached to the bottom of the case 5b, and then transferred to a power transmission mechanism 22 such as a timing belt. It is input to the bevel gear mechanism 23 via. 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.
Rack 26 protruding from a carrier 25 attached to the end portion of each end member 4b, 4c on the side of central member 4a is engaged with 4 from both sides. That is, the carrier 25 is supported by two guide rods 27 installed in a direction perpendicular to the transfer bar 4.
The racks 26, which are alternately protruded from the opposing surfaces of these carriers 25, are engaged with the pinions 24, and the clamp motor 20 moves each transfer bar 4 in the separating direction. In other words, the bevel gear mechanism 23 is moved in the clamping and unclamping directions, and the end of the horizontal shaft 23b of the bevel gear mechanism 23 is equipped with an overrun detection cam 28, a non-contact switch 29, and a signal for clamp synchronization control. A detector 30, such as a cercin, is provided for each detection.

On the other hand, in the lift mechanism 8 housed in the case 5b, a lift motor 35 made of a DC motor is attached to the side of the case 5b, and the rotation of the lift motor 35 is reduced by a speed reducer 36 and then a timing belt The power is input to one end of the equalizer shaft 38 via a power transmission mechanism 37 such as the following. The equalizer shaft 38 is a ball spline shaft and is provided in a direction perpendicular to the transfer bar 4.
The central portion is rotatably supported by a bearing means 39, and pinions 40 are splined to both ends. Each of the pinions 40 is provided in each of the carriers 25, and is a rack 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. 41a are engaged. Each of the guide rods 41 and 42 passes through the inside of the carrier 25 in the vertical direction, and supports each transfer bar 4 in a vertically movable manner.
The rack 41a is formed on one guide rod 41, and the pinion 40 side surface of the other guide rod 42 is provided with a protruding rack 41a.
0, 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. Further, a box-shaped case 63 is provided at the bottom of one end of the pedestal 61, and an elastic body 64 such as urethane rubber is housed in this case 63 by being clamped between a pair of pressing plates 65. . 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.
By tightening the elastic body 64, the elastic body 64 can be pressurized, and the pressing plate 6 on the opposite side can be pressed.
5 has a case 63 attached to a ball 67 that engages with a recess 62a formed on the end surface of the lift guide 62.
The ball 67 is brought into contact with the lift guide 62 by the elasticity of the elastic body 64.

In addition, 70 in the figure is a rest device for placing the central member 4a of the divided transfer bar 4 and pulling it 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, a guide rod 42 provided parallel to the guide rod 41 on which the rack is formed
Since the guide rod 41 is also raised to support the load force of the lift guide 62, even if only one guide rod 41 is raised by the pinion 40, the lift guide 62 can be raised without tilting.

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 is transmitted to the carrier 15 of the feed mechanism 6 via the rack 13 by the pinion 14 attached to the rotating shaft 12.
is moved to the right along the guide rod 16, and the transfer lever 4 coupled to the carrier 15 via the guide pin 19 is also moved to the right and enters the advance operation, and at this time, the cradle 6 of the lift mechanism 8
1 and the transfer bar 4 to allow movement of the transfer bar 4. When each transfer lever 4 reaches the advance end, the feed motor 1
0 is stopped, the lift motor 35 is reversely rotated, and the transfer lever 4, which has been in the raised position, is lowered. When the transfer bar 4 finishes descending, the control means outputs a control signal to the clamp motor 20, the clamp motor 20 is reversed, the transfer bars 4 are moved in a direction away from each other, and the unclamping operation begins. . By the above unclamping operation, the work 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.
First, the workpiece is returned to the clamped position.
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 located 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, this device is designed to drive the transfer lever in the lifting direction by a lift motor consisting of a DC servo motor, and by controlling the lift motor with a signal from the control means, the lift length can be adjusted. The lift start and end points and feed line height can be set arbitrarily, making it easy to change them according to the shape and size of the workpiece. In addition, since there are multiple guide rods that support each transfer lever in a vertically movable manner, one of the guide rods is provided with a rack, and a pinion that meshes with this rack moves the transfer lever through the single guide rod. Even if the supported lift guide is moved up and down, the smooth guide rod also moves up and down at the same time to support the load of the lift guide, allowing smooth up and down movement while maintaining the lift guide in a horizontal state.

Moreover, since an overrun detection means is provided to prevent the transfer lever from colliding with the slide etc. even if the control means runs out of control, it is possible to prevent damage to the transfer device or the press itself, and to reduce the lift stroke amount. By providing a detection means such as a celsin that constantly monitors and obtains a control synchronization signal that determines the start point of the next operation of the device, it is possible to improve control precision and operation reliability.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, in which Fig. 1 is an overall perspective view, Fig. 2 is a cross-sectional view of the feeder mechanism, Fig. 3 is a vertical sectional view thereof, and Fig. 4 is a cross-sectional view of the feeder 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, 35 is a lift motor, 40 is a pinion, 41 and 42 are guide rods, and 41a is a rack.

Claims (1)

[Scope of utility model registration request] Between each upright 1 of the transfer press,
A pair of transfer bars 4 are provided parallel to each other and along the conveyance direction of the workpiece, and a plurality of guide rods 41 and 42 are provided below these transfer bars 4 to support the transfer bars 4 in a vertically movable manner. One of the guide rods 41 and 42 is formed with a rack 41a that meshes with a pinion 40 attached to an equalizer shaft 38 provided perpendicularly to the guide rods 41 and 42.
is connected to a lift motor 35 consisting of a DC servo motor via a timing belt 37, and
On the other end side of the equalizer shaft 38, there is an overrun detection means consisting of an overrun detection cam 43 and a non-contact switch 44 operated by the cam 43, and a detection means for obtaining a control signal for lift synchronization from the rotation of the equalizer shaft 38. A lift mechanism for a transfer device.