JPS6110916Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer bar lift device for transporting workpieces to each station in a transfer line.

The purpose of this invention is to make the lifting and lowering movement of the transfer bar a mechanical operating mechanism, and to reduce the shock when transferring workpieces at multiple locations near the rising end, near the falling end, and at intermediate points, and to quickly raise and lower the transfer bar. The purpose of this is to perform the following actions.

The movement of the lift-and-carry transfer bar that transports workpieces to each station of the transfer machine is to move the transfer bar located at the descending end backwards, then lift it to the ascending end, then move it forward and return to the descending end again. This is the action of lowering. The lift device in this case is composed of a tie rod provided parallel to the transfer lever and a link lever that is raised and lowered by the forward and backward movement of the tie rod. Conventionally, the drive device for moving the tie rod forward and backward has adopted a hydraulic drive system using a hydraulic cylinder device connected to one end of the tie rod.

As the posture of the workpiece changes at each station, the position at which the workpiece is received by the workpiece receiving member on the transfer bar changes. In such a hydraulic drive system, it is difficult to reduce the relative speed of the workpiece and the transfer fiber to alleviate the shock when the workpiece is transferred at a plurality of positions. In other words, in order to control deceleration at multiple positions, valve switching control is required, and it takes time to switch the valves, so it is very difficult to keep the time from the descending to the rising end of the transfer bar within around 1 second. It's impossible.
Therefore, even if there are multiple delivery positions for the workpiece, it is only possible to set the speed at each delivery position so that the workpiece does not cause a shock and to move the workpiece up and down at a constant speed over the entire lift stroke. For this reason, the time required for the lift operation becomes long, which is an obstacle to speeding up the transfer cycle.

In view of these conventional problems, the present invention provides a drum cam rotated by a constant speed motor with a deceleration cam section corresponding to a plurality of workpiece delivery positions, and engages a cam follower with this drum cam to perform forward and backward reciprocating motion. This reciprocating motion moves the tie rod back and forth, and the mechanical drive device uses the cam shape of the drum cam to control the speed only when transferring the workpiece, solving the conventional problems and improving the lift operation. The aim is to speed up the process.

Embodiments of the present invention will be described below with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 denotes a transfer bar supported on a base, which moves up and down between a descending end a and a rising end b, and moves forward and backward in the axial direction. A transport drive device 2 for moving the transfer bar 1 forward and backward is provided on the base, and as is well known, the rotation of the transport motor 3 is used to operate a crank arm 4 using a worm mechanism, and the crank pin of the crank arm 4 slides in the vertical direction. The structure is such that a movably engaged cross slide 5 is guided by a pilot bar 6 parallel to the transfer bar 1 to move forward and backward, and the transfer bar 1 integrally connected to the cross slide 5 is moved forward and backward.

Further, the elevating and lowering mechanism of the transfer fiber 1 is performed by link levers 9a and 9b that are raised and lowered by moving the tie rods 7a and 7b forward and backward in opposite axial directions. The link levers 9a, 9b have lower ends connected to the tie rod 7.
a, 7b, with fulcrums 10a, 10 at the intermediate points.
Support rollers 11a and 11b are provided at the upper end to support the lower surface of the transfer fiber 1. As the tie rods 7a and 7b move closer to each other in FIG. 1, the link lever 9
A and 9b are pivoted upward around fulcrums 10a and 10b, and pivoted downward by moving their axes in directions away from each other. Note that 8a and 8b indicate tie rod guides, and W indicates a workpiece.

The mechanism of the lift drive device 16 for axially moving the tie rods 7a, 7b will be explained with reference to FIGS. 3 to 6. The lift drive device 16 is provided on the side opposite to the conveyance drive device 2 across the transfer bar 1, and is connected to a lift motor (constant speed motor) 1.
7, a reduction gear 18 and a motion conversion device 19. That is, the lift drive unit main body 31
A support shaft 24 is rotatably supported in an axial direction perpendicular to the axial direction of the tie rods 7a and 7b, and the rotation of the lift motor 17 is decelerated and transmitted by a worm 22 and a worm wheel 23. Support shaft 24
A support drum 25 is fixed on the top, and a cylindrical cam member 26 is integrally fixed thereto. As is clear from the exploded view of FIG. 5, the cam member 26 has a cam groove 27 formed on its circumferential surface with a lifting stroke of a descending end a and an ascending end b. This cam groove 27 has a lowering cam 26 at 180 degrees, which is half of the circumference.
a, and the remaining 180 degrees is the rising cam 26b. In addition, each of the cams 26a, 26b is partially formed with slow-angle deceleration cam surfaces C1 to C3 that correspond to a plurality of deceleration positions depending on the workpiece W.

Furthermore, a guide bar 29 is fixedly provided in parallel with the support shaft 24, and a sliding body 30 is guided by this. The sliding body 30 is provided with a cam follower 28 that is guided in the cam groove 27 of the cam member 26, and an operating shaft 20 that extends in the axial direction parallel to the guide bar 29.

On the other hand, at the opposing ends of the tie rods 7a and 7b, one end of the tie rod 7b is connected by a link 12b to one end of an actuating lever 13 that makes a bell crank motion, and the other end of the actuating lever 13 is connected to the actuating shaft 20. is connected to the tip of the link 21 by a link 21. Further, it is connected to the other end of the tie rod 7a via a coupling lever 14 and a link 12a. In order to move the other tie rod 7a forward and backward in synchronization with the forward and backward movement of one tie rod 7b by the actuating lever 13, sector gears 15b and 15a that mesh with each other are fixed to the actuating lever 13 and the coupling lever 14. There is. In addition, in the case of a single long tie rod instead of the divided tie rods 7a and 7b as in the example shown in the figure, the sector gear 1
The tuning mechanism 5a, 15b and the coupling lever 14 are not required, and instead, the link lever 9a is installed so as to be raised and fallen in the same direction as the other link lever 9b.

Since the present invention has the structure as described above, the constant speed rotation of the lift motor 17 is reduced by the worm 22 and the worm wheel 23, and the constant rotation is transmitted to the support shaft 24, causing the cam member 26 to rotate at a reduced constant speed. . As a result, when the cam groove 27 is guiding the cam follower 28 with the rising cam 26b via the cam follower 28 being guided, the sliding body 30
is moved backward, and the actuating shaft 20 is moved backward. This retraction of the actuating shaft 20 causes the actuating lever 13 to pivot clockwise in FIG. 2, moving the tie rod 7b to the left and
That is, the link lever 9b is axially moved in the direction of upward rotation. At the same time, when the operating lever 13 is turned clockwise, one sector gear 15b also turns in the same direction, and the other sector gear 15a meshes with it.
is turned counterclockwise, and the tie rod 7a is axially moved to the right by the coupling lever 14, that is, in the direction in which the link lever 9a is turned upward. Therefore, the support rollers 11a and 11b at the upper ends of the link levers 9a and 9b move upward while supporting the transfer bar 1 located at the lower end a, and the cam member 26 moves upward.
When it rotates 180 degrees, the rising end b of the total lift amount is lifted.

In addition, the transfer bar 1 located at the rising end b
The downward movement of the cam member 26 is further rotated by 180 degrees, so that the cam follower 28 is rotated by the downward movement of the cam 26.
Guided by the cam groove 27 of a, the retracted operating shaft 20 is moved forward, and by the reverse operation described above, the tie rod 7b is moved to the right, and the tie rod 7a is moved to the left, and the link lever 9a is moved. , 9b downward to move the transfer bar 1 to the lower end a.
It is lowered to

At different deceleration positions depending on the workpiece W at required locations within the lift amount range of the lifting end and the lifting end, the deceleration cam surfaces C1 to C formed in the cam groove 27
3, the lifting speed is controlled and the workpiece W can be delivered without a shock.

As described above, according to the present invention, the driving device for moving the forward and backward axis of the tie rod for raising and lowering the transfer bar is converted into linear reciprocating motion by a drum cam rotated by a constant speed motor, and furthermore, this linear reciprocating motion is converted into linear reciprocating motion. This is a mechanical drive mechanism that transmits power to the tie rod via an operating lever that moves with a bell crank.The speed of the transfer bar's vertical movement is reduced at the workpiece delivery position by the deceleration cam surface of the drum cam. Even if the speed is increased, workpieces can be delivered without any shock.
Compared to conventional hydraulic cylinder devices with deceleration control, the lifting and lowering operation time can be shortened, and there is also the advantage of being able to smoothly decelerate at different positions depending on the workpiece, ensuring reliable handover of the workpiece. .

[Brief explanation of the drawing]

Fig. 1 is a side view of the device of the present invention, Fig. 2 is a plan view, Fig. 3 is a sectional view taken along the line of Fig. 2, Fig. 4 is a sectional view taken along the line of Fig. 3, and Fig. 5 is an expanded view of the cam member. 6 is a sectional view taken along the line of FIG. 4. 1...Transfer bar, 7a, 7b...Tie rod, 9a, 9b...Link lever, 12a,
12b...link, 13...operating lever, 14...
...Connection lever, 15a, 15b...Sector gear, 1
6... Lift drive device, 17... Constant speed motor, 2
0... Operating shaft, 21... Link, 24... Support shaft, 25... Support drum, 26... Cam member, 2
7...Cam groove, 28...Cam follower, 29...
Guide bar, 30...Sliding body.

Claims (1)

[Scope of utility model registration request] The transfer bar is raised and lowered by a predetermined lift amount using a plurality of link levers that are swingably supported on the base and a tie rod that connects one end of each link lever and moves forward and backward in the axial direction of the transfer bar. The apparatus includes: a drum cam rotatably supported on the base and rotated by a constant speed motor; a sliding body having a cam follower that engages with the drum cam and guided so as to be movable in the direction of the rotational axis of the drum cam; an operating shaft fixed to a moving body; an operating lever that connects the operating shaft and the tie rod and is horizontally pivotable on a base and performs a bell crank motion; and the drum cam has a plurality of workpiece transfer positions. A transfer lift device characterized by being provided with a deceleration cam section.