JPS63645Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conveying device using a chain drive.

[Conventional technology]

BACKGROUND ART In order to carry in parts in a factory, take out products, and move parts between processes, cylinder devices are used, and conveying devices that drive roller conveyors, belt conveyors, or chains by motors are used. In order to improve transport efficiency, efforts are being made to automate and increase the speed of transport devices.

[Problem that the invention attempts to solve]

However, in conventional conveying apparatuses, when conveying at high speed, if there is no stopper when stopping, the stopping position shifts and parts etc. cannot be stopped at a predetermined position. On the other hand, when stopping suddenly using a stopper or the like, there are drawbacks such as damage to parts due to the shock during stopping, and distortion of parts that are easily deformed. Moreover, when performing high-speed transport, if the structure is used to stop the transport machine using a stopper, the strength of the transport machine itself must be increased in consideration of the shock it receives, which increases the size of the equipment and the transport machine itself. Become. For this reason, there was a drawback that the conveyance speed was limited. If you try to eliminate the stopper and reliably control the stopping position in order to eliminate the shock when stopping, you will have to use a torque motor to control it by frequency conversion, which has the disadvantage of requiring a very expensive control device. It was hot.

The present invention was made in order to solve the drawbacks of the above-mentioned prior art, and its purpose is to provide a conveyance device that can ensure the accuracy of the stop position without using an expensive control device and without a shock. shall be.

[Means for solving problems]

In order to achieve the above object, the present invention includes a chain stretched between a pair of sprockets, a conveyor main body that is pulled by the chain and reciprocates between the sprockets, and a drive source that rotationally drives the sprockets. In the conveyance device, a guide provided on the conveyor body, an engagement groove provided in the guide substantially perpendicular to the longitudinal direction of the chain, and an engagement portion attached to the chain and inserted into the engagement groove. a stopper guide provided on one side of each sprocket and having a guide groove formed along the outer periphery of each sprocket; and a tensioner disposed on the opposite side of the chain from the chain side to which the engaging portion is attached. and a pulley, and the drive source includes a detector provided near each sprocket to detect the conveyor body, and a motor that stops in response to a detection signal from the detector. be.

[Effect]

With this configuration, the moving speed of the conveyor body at startup (start of conveyance) and stop is reduced, and speed control during acceleration and deceleration is performed smoothly, so there is no need to use an expensive control device. Moreover, it is possible to stop the conveyor at a predetermined position with high accuracy without giving a shock. In addition, the motor can be stopped automatically by a detector installed near the sprocket, and the engaging part is guided by the guide groove of the stopper guide, so there is no variation in the time from the detector's activation to the motor's stop. Even if this occurs, the main body of the conveyor can be stopped at a substantially constant position. In addition, since the chain part on the opposite side of the chain to which the engaging part is attached can be used for arranging the tension pulley, there is no need to provide a special mechanism or space for tension adjustment, and the chain tension can be adjusted. It is done easily and efficiently.

〔Example〕

A preferred embodiment of the conveying device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of an embodiment of a driving section of a conveying device according to the present invention. In FIG. 1, a guide 12, the details of which will be described later, is fixed to a bracket 10 of the main body of the conveyor. An engagement groove 14 is formed in the guide 12. The engagement groove 14 is provided substantially perpendicular to the longitudinal direction of the endless chain 16, and an engagement portion 18 consisting of a roller attached to the endless chain 16 is inserted into the engagement groove 14. The endless chain 16 is stretched between a pair of sprockets 20 and 22, and is driven by a motor 24 provided on one sprocket 22, and tension pulleys 26 and 28.
The tension is adjusted by. Stopper guides 30 and 32 are provided on one side of the sprockets 20 and 22, respectively. These stopper guides 30 and 32 have sprockets 20 and 2.
Guide grooves 34 and 36 are formed along the outer circumferences of the sprockets 20 and 22, so that the engaging portion 18 attached to the endless chain 16 can move along the sprockets 20 and 22.

The guide 12 is connected to the bracket 1 as shown in FIG.
The guide 12a on one side is provided on both sides of the guide 12a.
The engagement groove 14a is in the shape of a long hole. The other guide 12b is shorter than the guide 12a and is adapted to pass above the stopper guides 30, 32 as shown in FIG. And guide 12
The lower part of the engagement groove 14b provided in b is in an open state, and the engagement part 18b is inserted into the engagement groove 14b from below.
It is now possible to go in and out. Engagement part 18
a and 18b are rotatably attached to both ends of a U-shaped fixture 38, and the endless chain 16 is attached to the center of this fixture 38.

The stopper guides 30 and 32 have almost the same structure, and as shown in FIG.
It is lower than the upper end of the guide 1 described above.
2b can pass through. The guide groove 34 provided in the stopper guide 30 is formed along the outer teeth of the sprocket 20 around which the endless chain 16 is wound, and is open at the upper end so that the engaging portion 18b can enter therein.

The sprocket 22 is fixed to a drive shaft 44 of a reducer 42, as shown in FIG.
4 through the reducer 42, and is driven to rotate.

The sprockets 20, 22 are rotatably attached to a frame 50 supported by supports 46, 48 as shown in FIG. 6. A guide rail 52 is provided on the upper portion of the frame 50 along the longitudinal direction of the endless chain 16.
Limit switches 54, 56 are provided at both ends of the frame 50.
The conveyor body 58 is provided with a cylinder 62 mounted on a base 59 via a support bracket 60, and has operating arms 64, 66 fixed thereto via brackets for operating the limit switches 54, 56. The piston rod 68 of the cylinder 62
An arm 70 is attached to the tip of the workpiece 70 via a pin so as to be freely rotatable. The arm 70 is provided with a cylinder 72, and the cylinder 72 is provided with a gripping device 7 having a reference pin 74 and a workpiece chuck 76.
The gripping device 78 is provided with a cylinder 80, and is capable of gripping a workpiece 82 by the work chuck 76 which is actuated by the cylinder 80.

As shown in FIG. 7, the arm 70 has a base rotatably supported by a mounting bracket 84 provided on the base 59 via a pin 86. Further, a guide frame 88 is fixed to the lower part of the base 59 so as to straddle the guide rail 52. This guide frame 88
A bearing (not shown) is provided at a contact portion with the guide rail 52, and the rolling of this bearing allows smooth movement on the guide rail 52. Note that the above-mentioned bracket 10 to which the guide 12 is attached
is fixed to the support fitting 60.

The operation of the embodiment configured as described above is as follows.

For example, when the conveyor main body 58 is located at the right end in FIG. 1, the guide 12b is located above the stopper guide 32, and the engaging portion 18b enters into the guide groove 36 to be in position Q. In this state, the cylinder 62 is operated, the piston rod 68 is extended, the arm 70 is rotated counterclockwise about the pin 86, and is stopped at a predetermined position. Next, cylinder 7
2, the gripping device 78 is moved vertically downward, and the reference pin 74 is inserted into the reference hole of the workpiece 82. Thereafter, when the cylinder 80 is driven and the workpiece 82 is gripped by the workpiece chuck 76, the motor 24 is driven and the sprocket 22 is rotated in the direction of the arrow in FIG. When the sprocket 22 rotates, the endless chain 16 is driven, and the engaging portion 18 attached to the endless chain 16 is driven.
a and 18b move along the teeth of the sprocket 22. At this time, the engagement groove 14a of the guide 12a
The engaging portion 18a inserted into the engaging groove 14a gradually moves upward from the center of the engaging groove 14a, and gradually moves the guide 12a to the left in FIG.
Further, the engaging portion 18b gradually moves upward along the guide groove 36, enters the engaging groove 18b of the guide 12b from below, and pulls the guide 12b. The guide 12 by this engaging portion 18, that is, the conveyor main body 5
Since the movement of the engaging portion 18 along the periphery of the sprocket 22 is converted into a linear motion of the conveyor body 58, the conveyor body 58 is accelerated in a sine curve manner. Then, the conveyor main body 58
When the engaging part 18 reaches the top of the sprocket 22, it obtains the same speed as the engaging part 18 and moves at high speed on the guide rail 52.

When the conveyor main body 58 reaches the sprocket 20 side, the operating arm 64 operates the limit switch 54 and the motor 24 is stopped. Then, between the activation of the limit switch 54 and the stop of the motor 24, the engaging portion 18 pulls the guide 12 and
2b above the stopper guide 30.
At this time, the engaging portion 18b enters into the guide groove 34 of the stopper guide 30 from the engaging groove 14b of the guide 12b, and stops at position P. In addition, the engaging portion 18
a moves downward within the engagement groove 14a of the guide 12a and stops at approximately the center of the engagement groove 14a.

As described above, in this embodiment, the endless chain 16 is
The engaging portion 18 provided on the sprocket 20, 22
When moving along the peripheral edge of the guide 12, the engaging portion 18 moves up and down within the engaging groove 14 of the guide 12.
Since the rotational motion of the guide 12 is converted into a linear motion of the guide 12, speed control during acceleration and deceleration is performed smoothly, and no shock is given to the conveyor body 58. Therefore, the transport device can be made smaller, and the parts to be transported will not be damaged. Moreover, by providing a limit switch, the motor 24 can be automatically stopped. Further, since the engaging portion 18 moves along an arc, the conveyor body 58 can be stopped at a substantially constant position even if the time from the activation of the limit switch to the stop of the motor varies. Furthermore, in this embodiment, the guide grooves 34 and 36 are provided in the stopper guides 30 and 32 to allow the engagement portion 18 to enter.
8a will not come off from the engagement groove 14a of the guide 12a.

In the above embodiment, the motor 24 is stopped using the limit switches 54 and 56, but other detectors such as a phototube may be used, or the motor 24 may be stopped manually.

[Effect of idea]

According to the present invention, the moving speed of the conveyor body at startup (start of conveyance) and stop is reduced, and speed control during acceleration and deceleration is performed smoothly, without using an expensive control device. The conveyor can be accurately stopped at a predetermined position without giving a shock. In addition, the motor can be automatically stopped by a detector installed near the sprocket, and the engaging portion is guided by the guide groove of the stopper guide.
Even if there are variations in the time from the activation of the detector to the stop of the motor, the main body of the conveyor can be stopped at a substantially constant position. In addition, since the chain part on the opposite side of the chain to which the engaging part is attached can be used for arranging the tension pulley, there is no need to provide a special mechanism or space for tension adjustment. It can be done easily and efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of the drive unit of the conveying device according to the embodiment of the present invention, FIG. 2 is a detailed view of the guide of the embodiment and a sectional view showing the attachment state of the engaging portion, and FIG. 3 is the A detailed view of the engaging portion of the embodiment engaged with the guide, FIG. 4 is a detailed explanatory diagram of the stopper guide of the embodiment, and FIG. 5 shows the positional relationship between the guide and the stopper guide of the embodiment. Detail view,
FIG. 6 is a front view showing the overall structure of the embodiment, and FIG. 7 is a side view showing the overall structure of the embodiment. 10... Bracket, 12, 12a, 12b...
...Guide, 14, 14a, 14b...Engagement groove, 1
6... Endless chain, 18, 18a, 18
b...Engagement part, 20, 22...Sprocket, 2
4...Motor, 30, 32...Stopper guide,
34, 36... Guide groove, 54, 56... Limit switch.

Claims (1)

[Scope of utility model registration request] A chain stretched between a pair of sprockets,
In a conveying device that includes a conveyor body that is pulled by the chain and reciprocates between the sprockets, and a drive source that rotationally drives the sprocket, a guide provided on the conveyor body and a guide that is substantially orthogonal to the longitudinal direction of the chain are provided. an engaging groove provided in the guide, an engaging part attached to the chain and inserted into the engaging groove, and a guide groove provided on one side of each sprocket and extending along the outer periphery of each sprocket. a stopper guide formed thereon, and a tension pulley disposed on the chain opposite to the chain side to which the engaging portion is attached, and the driving source is provided near each of the sprockets and A conveyance device comprising: a detector that detects the conveyor body; and a motor that is stopped by a detection signal from the detector.