JPH0525765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a workpiece conveyance device for various workpiece manufacturing facilities, and more particularly to a workpiece conveyance device that grips a workpiece between a pair of chuck claws and feeds the workpiece at a fixed pitch.

Conventional technology A device that intermittently feeds workpieces such as electrical parts and mechanical parts one by one during processes such as machining and visual inspection processes uses a device that places the workpieces on a guide rail.
Generally, the workpiece is pushed by a feed claw and slid on a guide rail to be fed intermittently at a fixed pitch. However, in such workpiece conveyance devices, the workpiece slides on the guide rail, so depending on the shape and material of the workpiece, the workpiece may hit the joint of the guide rail and fall over, or friction between the guide rail and the workpiece may occur. Due to the resistance, the workpiece may not slide smoothly on the guide rail. Therefore, for workpieces that are not suitable for sliding on guide rails and feeding in fixed pitches, the workpiece on the workpiece conveyance path, such as a rail, is held between a pair of chuck pawls, lifted from the conveyance path, and then the workpiece is moved with the chuck pawls. The method is to feed the material at a fixed pitch to the conveyance path at different positions.

Problems to be Solved by the Invention There are various devices for lifting the workpiece from the workpiece conveyance path and feeding it in fixed pitches, but in general, a pair of chuck claws are attached to a conveyance mechanism that feeds a pair of chucks in fixed pitches along the workpiece conveyance path. A device equipped with means for opening and closing the chuck and means for moving a pair of chuck claws up and down is used. However, in this workpiece conveyance device, the chuck opening/closing means and the chuck pawl vertical movement means are operated independently by separate drive sources, which makes the entire device complicated, and the chuck pawl opening/closing and vertical movement of the pair of chuck pawls is complicated. There were reliability problems such as timing shifts and workpiece clamping errors.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a workpiece conveyance device which has a simple structure and requires few driving sources, which grips and lifts a workpiece between a pair of chuck claws and feeds the workpiece at a fixed pitch.

Means for Solving the Problems Therefore, in order to achieve the above object, the present invention has the following features:
In a device that clamps a workpiece between a pair of chuck pawls and feeds it at a fixed pitch, the pair of chuck pawls are
The chuck claws and the claw supports are provided on a pair of claw supports which are arranged on both sides of the workpiece transport path so as to be able to reciprocate in parallel with the workpiece transport path and to approach and separate from each other at a constant stroke. Both ends of a plurality of parallel levers, which are bent forward with respect to the conveyance path, are each rotatably pivoted, and the chuck pawls are constantly biased with an elastic pressing force toward the workpiece conveyance path by a spring material. To provide a workpiece conveyance device in which a workpiece is placed on the workpiece.

Function: According to the present invention, the lever is raised and rotated by using the driving force when the pair of chuck pawls are brought closer to each other by the approaching movement of the chuck support and the workpiece is held between the chuck pawls. By raising the workpiece, an independent drive system for moving the chuck claw up and down can be omitted. Further, by closing and raising the pair of chuck pawls by the approaching movement of the pawl support, the timing of the opening/closing movement and the vertical movement of the chuck pawls can always be accurately determined.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, numeral 1 denotes a workpiece, which in the drawings is a round bar-shaped object such as a mechanical part or a jig.
Reference numeral 2 denotes a work transport path such as a horizontal rail on which the work 1 is placed. Reference numeral 3 denotes a conveyance device according to an embodiment of the present invention, which feeds the workpiece 1 at fixed pitches to each fixed position on the workpiece conveyance path 2.

4, 4 in the workpiece conveyance device 3 are a pair of chuck claws facing each other on both sides of the workpiece conveyance path 2;
5 is a pair of claw supports that support the chuck claws 4, 4; 6, 6... are a plurality of levers that connect the pair of claw supports 5, 5 and the chuck claws 4, 4; 7, 7 are a pair of chucks. It is a spring member that always applies an elastic pressing force to the claws 4, 4 toward the workpiece conveyance path 2 side. 8, 8 supports a pair of claw supports 5, 5 and connects the workpiece conveyance path 2.
a pair of feed rods that reciprocate at a constant stroke along the axis of the feed rods;
9 is fixed on a fixed base 11 by a guide rail that supports the work piece 9 so as to be able to reciprocate in a direction perpendicular to the workpiece conveyance direction. Reference numeral 12 denotes a pawl opening/closing drive mechanism for moving the slide tables 9, 9 toward and away from each other along the guide rail 10. Although not shown, the mechanism 12 is a mechanism for transmitting the reciprocating motion of the cylinder to the pair of slide tables 9, 9 via a link mechanism. It is something.

A pair of chuck claws 4, 4 are arranged on both sides of the fixed workpiece stop position on the workpiece conveyance path 2 at a height that allows the workpiece 1 to be held at a position equidistant from the workpiece 1, and each end has a round bar shape. Work 1 is centered and machined with a V-groove so that it can be easily held. For example, there are a total of four levers 6, 6, . 13... are rotatably connected.
Each of these two levers 6, 6... is parallel and tilted forward toward the workpiece conveyance path 2, and the chuck claw 4 is normally
The chuck pawl 4 is placed on the pawl support 5 by its own weight. A coiled spring material 7 is compressed and inserted between the back surface of the chuck claw 4 and a spring receiver 14 protruding from the back surface of the claw support 5, and the spring force of this spring material 7 causes the chuck claw 4 to always move forward. to be oppressed. Therefore,
When an external force is applied backward from the tip of the chuck pawl 4, the external force causes the levers 6, 6... to upwardly rotate around the support shafts 13, 13... on the pawl support 5 side. The chuck pawl 4 then moves upward and backward in parallel rotation, and the spring member 7 is further compressed.

Next, the constant pitch feeding operation of the workpiece according to the above embodiment will be explained.

A pair of chuck claws 4, 4 are arranged on both sides of each workpiece stopping position lined up at a fixed pitch on the workpiece conveyance path 2, and another workpiece 1 is placed at a fixed position on the workpiece conveyance path 2 until the desired stop position is reached. When processing is performed, the pair of chuck claws 4, 4 are in an open state with the pair of slide bases 9, 9 separated by the maximum stroke, as shown in FIG.
When transporting the workpiece 1 in this state, first, the pair of slide platforms 9, 9 are moved toward each other in synchronization with each other at the same speed using the claw opening/closing drive mechanism 12. Then, the slides 9, 9 and the objects on them move closer together, and the pair of chuck claws 4, 4 approach the workpiece 1, and by moving closer to each other a certain distance, the chuck claws 4, 4 approach the workpiece 1 as shown in FIGS. 4 and 6. V-groove 15 at the tip of the chuck claws 4, 4,
The workpiece 1 is held between the rollers 15 and the center of the workpiece 1 is aligned. Further, when the slide tables 9, 9 are moved closer, the chuck pawls 4, 4 hit the workpiece 1 and do not move forward, and therefore, an external force is applied to the rear of the chuck pawls 4, 4, and the chuck pawls 4, 4 move to the lever. 6,6
. . . is slightly raised and rotated, whereby the chuck claws 4, 4 rise and lift the workpiece 1 from the workpiece conveyance path 2 while holding it as shown in FIG. At this time, the chuck claws 4, 4 have spring materials 7, 7.
Since the spring force is applied, the chuck claws 4, 4
The workpiece 1 is elastically pressed and held and lifted.

When the chuck claws 4, 4 lift the workpiece 1 to a predetermined height, the slide tables 9, 9 stop, and in this state, the feed rods 8, 8 slide on the slide tables 9, 9 and move the workpiece 1 at a fixed pitch in the axial direction. After being fed, the workpiece 1 is held between the chuck claws 4, 4, and is fed at a fixed pitch while being lifted up. When this fixed pitch feeding of the workpiece is completed, the slide tables 9, 9 rotate in the opposite direction and move back and away from each other to the original fixed position. During this time, the chuck pawls 4, 4 descend first to lower the workpiece 1 to the next fixed position on the workpiece conveyance path 2, and the chuck pawls 4, 4 separate from the workpiece 1 to move the chuck pawls 4, 4 away from the workpiece 1. Return to the state shown in Figure 3.

Note that the workpiece to be conveyed by the device of the present invention is not limited to a round bar shape, but any workpiece that can be held between a pair of chuck claws may be used, and if the surface of the workpiece is slippery, it will not slide on the chuck claws. It is necessary to take measures such as applying a stopper.

Effects of the Invention According to the present invention, the workpiece is held and lifted by the chuck pawls only by the driving force that brings the pair of chuck pawls close to the workpiece, so the opening/closing movement and the vertical movement of the chuck pawls can be performed by one drive system. As a result, the entire device can be simplified and the cost can be reduced. In addition, since the opening/closing and vertical movement of the chuck pawl are performed by one drive system, the timing of opening/closing and vertical movement of the chuck pawl can always be accurately performed, ensuring reliable gripping and lifting of the workpiece, and excellent reliability. can provide something.

[Brief explanation of the drawing]

1 and 2 are a plan view and a front view of a workpiece conveyance device showing one embodiment of the present invention, and FIG. 3 is a
Enlarged side view along line A-A in the figure, Figures 4 and 5
The figures are side views showing the operating state of the apparatus shown in FIG. 3, and FIG. 6 is a partial plan view of FIG. 4. 1... Work, 2... Work conveyance path, 4, 4...
...a pair of chuck claws, 5, 5...claw support, 6,
6...Lever, 7,7...Spring material.

Claims (1)

[Claims] 1. In a device that feeds a workpiece in a fixed pitch by holding it between a pair of chuck claws, the pair of chuck claws are capable of reciprocating on both sides of a workpiece conveyance path in parallel with the workpiece conveyance path, and are also capable of approaching and moving away from each other at a fixed stroke. The chuck claws and the claw supports are provided on a pair of arranged claw supports, and both ends of a plurality of parallel levers, which are bent forward with respect to the workpiece conveyance path, are rotatably pivoted. In addition, the chuck pawl is always placed on the workpiece conveyance path side with an elastic pressing force applied by a spring member.