JPS6021152Y2 - transfer device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a transfer device that is attached to an automatic machine tool and intermittently transports and supplies workpieces to the automatic machine tool.

On processing lines for relatively large parts that require mass production, such as automobile cylinder bodies, cylinder heads, crankshafts, camshafts, and other engine parts, a variety of automatic machine tools are arranged and installed according to the process order. At the same time, transfers adapted to the flow on the line are installed between the machining stations of each machine tool, or between the machining stations and idle stations set for unavoidable waiting times, time adjustments, etc. The equipment is installed and runs the entire processing line at regular intervals and times, increasing the space efficiency of the line.
It is normal to try to increase the production efficiency of machining operations.

Therefore, in such a machining line, it is necessary that the machining efficiency of the machine tool and the operating efficiency of the transfer device are balanced, and even if the efficiency of only one of them is increased, the productivity of the line will not be improved. No.

Recently, however, advances in machine tools have significantly increased their machining efficiency, and as a result, there is now a strong demand for transfer devices to increase their operating speeds.

By the way, in the configuration of this type of transfer device that has been commonly used in the past, a hydraulic or pneumatic cylinder is used as the power for transporting the workpiece, and the workpiece is moved to a predetermined position by a lift-and-carry circulation operation of the workpiece transport bar. Many structures are used to transport the material at a stroke pitch of .

However, with such conventional feeding devices, in order to increase the feeding speed, a large-capacity fluid pressure unit and a large-diameter fluid pressure cylinder are required, resulting in an increase in the size of the drive system structure. Not only is this unavoidable, but the increased weight of the drive system components causes large shocks at the start and stop of circulating operation, making it extremely difficult to increase the speed beyond a certain level. was there.

In addition, conventional devices can only transport one type of travel distance with one transport drive mechanism, so when there is a machine tool with a large required floor space on the same transfer line,
The travel distance of the transport drive mechanism must be set according to this machine tool, and the small machine tools mixed on the transfer line must be installed at the same pitch as the large machine tools, so in the end, the transfer line There is a drawback that the total predetermined floor area becomes large.

The present invention was devised to solve these problems, and the purpose of the present invention is to develop a transfer system that can achieve two or more high-speed conveyance operations that can correspond to the characteristics of automatic machine tools. The goal is to provide equipment.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in FIGS. 1 and 2, the transfer device of the embodiment includes a carry drive section 1 installed at an appropriate position in a processing station, and a stationary section ( a pair of workpiece loading-side fixing bars 2A and a workpiece unloading-side fixing bar 2B supported by
It is composed of a first conveyor bar 3A on the workpiece loading side and a second conveyor bar 3B on the workpiece unloading side, which are a pair of bars disposed inside each fixed bar 2A, 2B.

Each of the transport bars 3A, 3B includes a first, a first, and a second transport bar installed on the floor at appropriate intervals along the transport bar. Second. Third stand 4
, 5.6, and is horizontally slidably held by a plurality of levers 7.8 in a device which will be described later and serves as both a support mechanism and a lift drive mechanism.

Note that each fixed bar 2A, 2B has a different stroke S1. The ear piece 9 of the workpiece is cut at each pitch of S2, and each of the conveyor bars 3A, 3B is cut at the same pitch of S1. At S2, the ear rest 10 of the workpiece is provided in a protruding manner.

Further, although not shown, automatic machine tools for processing different workpieces are installed at appropriate locations along each of the fixed bars 2A and 2B.

Next, the lift drive mechanism will be described.

Each of the levers 7.8 has a curved part in the center with a number 4.5, 6.
are pivotally connected to the respective brackets 4a, 5a, 6a, and each lower end is pivotally connected to a transmission rod 11 that passes through the device in a direction parallel to the conveyor bars 3A, 3B. As the rod 11 moves axially, all levers 7.8 swing in unison.

Therefore, in the middle of the lower arm of a specific lever 7 supported at the rear end of the first stand 4, a bracket 5a of the second stand 5 installed at the rear of the first stand 4 is attached. The tip of the piston rod of the hydraulic cylinder 12 is pivotally connected,
Therefore, by operating the same hydraulic cylinder 12, all levers 7.
8 swings together.

On the other hand, long holes 13 extending in the length direction of the transport bars 3A, 3B are bored at important points in each of the transport bars 3A, 3B, and each of the levers 7. A rotatably supported roller 13a is fitted to the tip of the upper arm of 8, so that when each lever 7.8 is rotated counterclockwise in the drawing,
The transport bars 3A, 3B rise while maintaining a horizontal state regardless of their longitudinal movement position, and each lever 7.8
When the transport bars 3A and 3B rotate clockwise,
It descends while maintaining a horizontal state regardless of its longitudinal movement position.

Next, the carry drive mechanism will be explained with reference to FIGS. 4 to 7.

The mechanism is composed of a carry drive section 1 and longitudinally grooved plates 14A, 14B that are fixed to the side surfaces of opposite ends of each of the transport bars 3A, 3B and engage with the drive section 1.

First, the drive section 1 is composed of a box-shaped base 15 at the lowest stage, a reduction section 16 at the lower stage, a torque limit section 17 at the middle stage, a motor section 18 at the upper stage, and a motor control box (not shown). , and a rotation angle detection section 20 protrudes from the outer surface of the deceleration section 16 .

The lower end of a transmission arm 22 is pivotally supported on a support shaft 21 that protrudes from the inward side surface of the base 15.

A rotating shaft 24 of a worm wheel 23 is mounted horizontally on the speed reducer 16, and the base end of a drive arm 25 is pivotally attached to the inwardly projecting end of the rotating shaft 24.
A ring 20b for mounting a dog 20a is fixed to the outwardly protruding portion of 4.

A limit switch 20c is disposed in the detection section 20 facing these dogs 20a.

Note that the shaft of a worm 27 that meshes with the worm wheel 23 is connected to the lower end of the motor output shaft 26 that penetrates the upper torque limit portion 17 and projects downward.

In addition, a torque limit is interposed in the motor output shaft 26 that passes through the inside of the torque limit portion 17 vertically, and the shaft transmission is disconnected at the upper limit regulation value of the load torque applied to the output shaft 26. It has the function of issuing a command to stop the operation.

Further, the motor unit 18 is equipped with a motor with a brake, and this motor is energized by a separate motor control box (not shown), so that the output shaft 26 of the motor is directed downward as described above. It protrudes to reach the deceleration section 16.

In normal operating conditions, this motor repeatedly rotates in two directions, alternately in forward and reverse directions.

The motor control box has a built-in circuit that energizes the motor in a predetermined amount based on the input of the signal from the rotation angle detection section 20, and under normal operating conditions, rotates the motor alternately in forward and reverse directions. The worm wheel 23 is driven to stroke within a fixed arc.

In addition, when the stroke needs to be adjusted, the motor can be rotated slowly by the required number of rotations according to an operation command.

Next, a transmission arm 22 whose lower end is pivotally supported on a support shaft 21
A pair of rails 22a, 22a protruding parallel to the longitudinal direction is provided on one side surface (the side surface facing the deceleration part 16 side) of the
A guide groove 22b is formed in between, and a first roller 28 serving as a first retaining protrusion rotatably supported on the tip of the drive arm 25 is engaged with the guide groove 22b. As a result, as shown by the chain line in the drawing, the transmission arm 22 is driven by the stroke rotation of the drive arm 25.
The stroke oscillates between small arc degrees.

Furthermore, the opposite side of the transmission arm 22 (transfer bars 3A, 3
A second roller 30 and a third roller 31 as second and third engaging protrusions are rotatably supported at two locations on the B side (side surface) at the center and the upper end, respectively. It is installed protrudingly.

On the other hand, vertical grooves 32a and 33a are formed on the outer surfaces of the vertical plate portions 32.33 of the vertically grooved plates 14A and 14B fixed to the end faces of the first and second conveyor bars 3A and 3B close to the drive unit 1, respectively. The second and third rollers 31 and 30 of the transmission arm 22 fit into each groove 32at33a, respectively.

Therefore, the conveyor bars 3A, 3B are driven by the stroke swing of the transmission arm 22, and are driven to have a sliding stroke regardless of the vertical height of the conveyor bars 3A, 3B, and the stroke of the first conveyor bar 3A on the workpiece loading side is S1 is the second
It is twice the stroke S2 of the conveyor bar 3B.

Next, the operation of the transfer device configured as above will be explained.

During the transfer operation of the transfer device, the energization control of the carry drive motor 18 and the operation control of the lift voltage cylinder 12 are operated synchronously, and as shown in FIG. The transport bars 3A and 3B perform a cycle of lift-and-carry circulation operation.

That is, the first conveyor bar 3A (FIG. 3a) repeats the cycle of lifting up U → carry conveying S □ → lowering the lift → carrying backward R1, and in the middle of the ascent U, the fixed bar 2
The workpiece W1 placed on the ear support 9 of A is transferred to the transport bar 3A.
The workpiece W1 is carried by the ear support 10 of the workpiece W1, and during the descent, the workpiece W1 that was being carried is left behind on the ear support 9 of the fixed bar 2A on the front side of the pitch.

Further, the second conveyor bar 3B (Fig. 3b) moves as follows: Lift up U → Carry conveyance S2 → Lift down D → Carry retreat R
1 is repeated, and in the same manner, the workpiece W2 is moved from the ear holder 9 of the fixed bar 2B to the ear holder 9 one pitch forward (left side in the drawing).

Therefore, each time the transport bars 3A and 3B carry out one stroke of transport, the workpiece Wt (or W2) that was in the ear receiver 9 of the loading-side fixed bar 2A (or the unloading-side fixed bar 2B)
is stroke S□ (or half stroke S2)
pitch is transferred to the ear receiver 9 on the forward side.

Furthermore, since the distance between the ear holder 9 at the tip of the loading side fixed bar 2A and the ear holder 9 at the rear end of the unloading side fixed bar 2B is equal to the stroke S□ of the transport bar 3A, the loading side fixed bar 2A The workpiece W1 that was in the lug holder 9 at the tip of is transferred to the lug holder 9 at the rear end of the carry-out side fixing bar 2B.

Since the transfer device of the embodiment operates in this way,
If this transfer device is equipped with an automatic machine that takes out the workpiece from the ear support 9 and supplies it to the automatic machine tool, and also takes out the processed workpiece from the machine tool and returns it to the ear support 9, the workpiece processing line can operate unmanned. It becomes possible to do so.

Therefore, in the above-mentioned conveyance operation, the carry stroke is performed mechanically by the cooperation of the rotating member and the swinging member, and the speed is slow due to the sinusoidal force at the beginning and end of the stroke. In addition to the small inertia of the transmission system, the generated acceleration is small, so there is no shock during operation, and as a result, it is possible to set the conveying speed sufficiently high.

In addition, in the above-described configuration, the stroke S1. S2
The ratio of By changing the distance to the engagement protrusion, it is possible to set the required stroke ratio.

As explained above, the transfer device according to the present invention is a transfer device in which a transfer bar for transferring a workpiece is moved in strokes by a transmission arm that repeatedly rotates in two directions, forward and backward, in which the transmission arm is ,
The drive arm is slidably engaged with one side of the drive arm to allow the above-mentioned rotations to be repeated, and the other side of the drive arm is slidably engaged with the transport bar to allow the above-mentioned stroke movement. This is what I did.

Therefore, it is possible to engage and drive two or more conveyance bars at the same time on the other side of the transmission arm,
In this case, the stroke movement of the two or more conveyor bars is as follows:
Each has a different length depending on its engagement position with the transmission arm, and can be installed between multiple automatic machine tools of various sizes with different installation intervals, eliminating the need for an idle station and minimizing the floor space required. This has the advantage that the various functions and operations required of this type of device can be satisfied with a simple structure.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view of a transfer device showing an embodiment of the present invention, FIG. 2 is a front view of the same, and FIGS. Fig. 4 is an enlarged view of the main part in Fig. 1, Fig. 5 is an enlarged view of the main part in Fig. 2, and Fig. 6 is an operation diagram of the main part.
FIG. 2 is an enlarged side view of the main part, and FIG. 7 is a view taken in the direction of arrow E in FIG. 6.

Claims (1)

[Scope of utility model registration request] a drive arm that is rotated by a drive device; a transmission arm that is slidably engaged with the drive arm on one side and repeatedly swings in strokes in two forward and reverse directions; and an opposite side of the transmission arm. At least first and second conveyor bars are provided that are slidably engaged at different locations in the longitudinal direction of the side surface to move the straw 9 by different amounts along a predetermined material transfer path. A transfer device characterized by: