JP2542191Y2 - Endless chain conveyor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an endless chain conveyor particularly suitable for a shaft workpiece.

[0002]

2. Description of the Related Art As shown in FIG. 4, a chain conveyor for a shaft workpiece generally used in the prior art is provided with sprocket wheels at both ends of drive shafts 2 and 3 rotatably provided at both ends of a machine base 1 by bearings. 4a, 4b; 5a, 5
b is fixed and the sprocket wheels 4a, 5
a; Chains 6a and 6b are endlessly wound around 4b and 5b, respectively. And endless chain 6
a, 6b, each link 8a, 8b or one by the workpiece,
V-shaped shaft workpiece receivers 7a and 7b are attached to corresponding positions on every second link 8a and 8b, respectively.
A sprocket wheel 9 is also fixed to the end of the drive shaft 2, and is connected to a sprocket wheel 11 of an output shaft of a motor 10 provided on the machine base 1 by a chain 12 and is connected to a chain 6.
a and 6b are circulated. The workpiece is placed on V-shaped receiving stands 7a and 7b attached to links 8a and 8b of chains 6a and 6b, and the robot or loader 1 is mounted.
The workpiece is conveyed from the workpiece delivery position by 3 to the processing machine or from the machine processing position to the finished product unloading position.

[0003]

When such a chain conveyor is combined with a machine tool equipped with a robot / loader and put into a machine tool cell or line, the endless chain conveyor itself serves as a stocker. There are cases. In this case, since the workpiece is placed on the cradle, the stock amount is limited by the length of the conveyor,
In order to increase the stock amount, the length must be increased, and there is an uneconomical problem of increasing the floor space as the length increases. SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to provide an endless chain conveyor that can increase the stock amount without increasing the floor space.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention corresponds to two parallel chains.
In chain conveyors having a plurality of cradle consisting of a pair of attaching the Ri, the cradle of one or conveyor on both sides
On both sides of the cradle intermediate shaft inserted through orthogonal to the traveling direction
Pivotally pivoted almost in the center, upper end holds workpiece
That a pressing arm which is formed in an L shape, and a spring which always turning urging presser arm in a direction pressing the workpiece on pedestal above, both
Pivoted in the direction of the cradle is provided between the ends of the sprocket wheel opens the presser arm retainer comes into contact with the lower end of the presser arm during positioned above the switch <br/> Enkonbea
That comprises a guide plate, gripping the workpiece by the other of the movement range are open retainer in draft <br/> the plate presser arms with upper surface movement range
And works also as a work stocker .

[0005]

[Function] The holding arm of the cradle located on the upper surface of the conveyor is
As the conveyor moves, the lower end roller is in contact with the horizontal guide plate, is tilted forward, and is opened to the side where it escapes from the upper surface of the pedestal. Chain constraints horizontal guide plate is released at a position approaching the sprocket wheel to move the presser arm writes even pressing a workpiece by a spring. Even if the chain goes down, the work is held by the holding arm, so it becomes a stocker.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in FIG. The support shaft 1 is located at a position deviated from the support center of each of the left and right corresponding V-shaped pedestals 7a and 7b of this conveyor.
5 is inserted and fixed in parallel with the drive shaft 2. A spring receiving shaft 16 serving as a holding arm stopper is inserted and fixed parallel to the V-shaped support center of the receiving base. And support shaft 1
A holding arm 17 having a holding surface having an L-shaped upper end substantially at the center of the center 5 is rotatably supported at the center substantially, and the axial movement is stopped by snap rings 18 on both sides. A torsion spring 19 is inserted into the support shaft 15, one end of the spring is inserted into a hole of the holding arm 17, and the other end is hooked on a spring receiving shaft 16, and the holding arm 17 is Bearing 1
6 are urged to abut. And holding arm 1
A roller 21 pivotally supported by a pin 20 parallel to the support shaft 15 is provided at the lower end of 7.

The distance between the sprocket wheels at both ends is determined by the height at which the horizontal guide plate 22 abuts the roller on the locus of movement of the roller 21 of the presser arm 17 that moves with the movement of the chains 6a and 6b at the upper portion of the machine base 1. It is attached to a plurality of support shafts 23 fixed to the machine base 1. Horizontal guide plate 22
The sprocket wheels at both ends are formed on the inclined surface 22a so that the distance from the roller 21 gradually increases. An index dog 24 that emits a signal at every pitch of the chain is fixed to the end of the drive shaft 2 opposite to the sprocket wheel 9, and the rotation of the drive shaft 2 activates a limit switch 25 attached to the machine base 1. Thus, the rotation of the motor driven by the command of the control device is controlled so that the chain is fed one pitch at a time.

The operation of the present invention will be described. The presser arm 17 at the upper position has the roller 21 at the lower end in contact with the horizontal guide plate 22 and is inclined in the traveling direction of the chains 6a, 6b so that the L-shaped presser surface escapes from the support surfaces of the receiving tables 7a, 7b and opens. It is placed in the position. The robot workpiece or the finished product is placed on the V-shaped pedestals 7a and 7b in which the holding arm 17 is opened by the robot or the loader 13. When the motor is rotated by a command from the control device and is fed by one pitch by the action of the index dog 24 and the limit switch 25, the shaft work is placed again by the loader 13.

In this manner, the workpieces are placed and sent sequentially,
The holding arm 17 of the pedestal approaching the sprocket wheels 4a, 4b is applied to the inclined surface 22a of the horizontal guide plate 22, the distance between the inclined surface and the roller is increased, and the holding arm 17 is gradually raised. The holding arm 17 detached from the horizontal guide plate 22 at the upper position of the sprockets 4a, 4b strongly presses the shaft workpiece by the force of the torsion spring 19, and holds it with the V-shaped receiving bases 7a, 7b. The chains 6a, 6b are moved downward around the sprocket wheels 4a, 4b. However, since the shaft workpiece is gripped by the holding arm 17, the stocker returns without falling off. The pressing arm 17, which has passed the lower side and turned around the sprocket wheels 5a, 5b to the upper surface, is gradually inclined forward when the roller 21 comes into contact with the inclined surface 22a of the horizontal guide plate 22. Release the grip. In this embodiment, the holding arm 17 is provided on the support shaft, but may be provided on one or both side surfaces of the V-shaped pedestal.

[0010]

[Effect of the Invention] As described above, the present invention has the following effects. Since the work piece can be held also on the lower side of the endless chain, it is possible to secure twice or more the amount of stock in the same space as in the conventional type that can hold only the upper surface. In addition, the endless chain had to be equipped with a cradle and jigs all around regardless of the presence or absence of a workpiece, eliminating the problem of unnecessary and high equipment costs when the jigs are special and expensive. Was done.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a chain conveyor driving shaft of the present invention.

FIG. 2 is an AA line view of FIG.

FIG. 3 is a perspective view of a holding arm portion.

FIG. 4 is an explanatory side view of a conventional chain conveyor.

[Explanation of symbols]

1 machine stand 2 drive shaft 6a, 6b chain 7a, 7b
V-shaped pedestal 15 Support shaft 16 Spring receiving shaft 17 Holding arm 19 Torsion spring 22 Horizontal guide plate

Claims (1)

(57) [Scope of request for utility model registration] (1) correspondingly taking two parallel chains;
In chain conveyors having a plurality of cradle consisting of a pair of attaching the Ri, the cradle of one or conveyor on both sides
On both sides of the cradle intermediate shaft inserted through orthogonal to the traveling direction
Pivotally pivoted almost in the center, upper end holds workpiece
That a pressing arm which is formed in an L shape, and a spring which always turning urging presser arm in a direction pressing the workpiece on pedestal above, both
Pivoted in the direction of the cradle is provided between the ends of the sprocket wheel opens the presser arm retainer comes into contact with the lower end of the presser arm during positioned above the switch <br/> Enkonbea
That comprises a guide plate, gripping the workpiece by the other of the movement range are open retainer in draft <br/> the plate presser arms with upper surface movement range
Endless chain conveyor, characterized in Rukoto also serves as a work stocker configured to.