JPH0418987B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a transfer device that transfers objects such as workpieces by means of pins protruding from a transfer bar that moves up and down as well as horizontally. It is related to.

<Prior art> A transfer bar equipped with a pin inserted into a pin hole drilled in a workpiece is supported by a lifting link so as to be movable horizontally, and the transfer bar is connected to a rotating cam via the lifting link. A slide carry type transfer device is known in which a workpiece is conveyed by moving the workpiece up and down by a crank arm that rotates concentrically and at the same time as the rotating cam and giving a forward and backward motion to the transfer bar through a forward and backward link. .

<Problems to be Solved by the Invention> In this type of device, in order to shorten the time for transporting the workpiece, an operation of inserting a pin into a pin hole is required at the starting point of the transport operation. Therefore, conventionally, the insertion of the pin and the start of the conveyance operation are performed at the same time. However, in order to insert the pin and start the conveyance operation at the same time, as shown in FIG. It starts, inserts into the pin hole H at the intermediate rising point b, and contacts the pin hole H at the rising end completion point c. That is, the amount of horizontal movement B is required to be larger than the amount of rise A of the pin. Therefore, the pin hole H needs to have a large hole diameter commensurate with the amount of horizontal movement of the pin, which increases play between the pin and the pin hole, making it difficult to accurately transport and position the workpiece.

<Means for Solving the Problems> In order to solve the above-mentioned conventional problems, the present invention changes the starting point of the pin ascent by the rotary cam from the conveyance starting point to the cam rotation angle required to complete the rising end of the pin. θ
The operation start position of the crank arm is shifted in phase by θ/2 with respect to the rotating cam so that the crank arm starts operating in advance by θ/2.

<Function> In the present invention, when the pin starts to rise, the pin is inserted into the pin hole while moving backward in the horizontal direction by turning the crank arm by θ/2 until the lift reaches 1/2 until the end of the lift is completed. The arm moves forward after passing θ/2, contacts the pin hole, and transports the object.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. In FIGS. 1 to 3, 1 is a base, and 2 is a support that is erected on the base 1. As shown in FIGS.
A rail 3 is fixedly installed on this support 2 to transport the workpiece W by sliding it horizontally on a slide surface 3a. Further, the workpiece W is provided with a pin 6, which will be described later.
A pin hole 4 is provided in the vertical direction for insertion and removal.

Reference numeral 5 denotes a transfer bar, and a pin 6 protruding from its upper surface is inserted into and removed from a pin hole 4 provided in the workpiece W. The transfer bar 5 extends parallel to the rail 3, moves up and down between the solid line position in FIG. 1 and the lift position L shown in chain lines, and moves horizontally back and forth with a predetermined amount. To explain its specific configuration, a horizontally long guide groove 10 is provided in the transfer bar 5,
A roller 9 attached to the horizontal tip of a mold link 7 rotatably mounted on a support shaft 8 above the vertical wall of the fuselage is inserted into a guide groove 10 and supports the transfer bar 5. This mold link 7 is a part of the lifting link that moves the transfer bar 5 up and down.
an L-shaped link 11 pivotally connected at 2;
It is composed of a connecting link 13 that connects the vertical end of this L-shaped link 11 and the vertical end of the above-mentioned "type link 7."In addition, the horizontal end of the L-shaped link 11 is provided with a rotary cam. A roller 14 is attached which is always in contact with the cam surface of 15.

The rotary cam 15 has a first cam surface 15a that holds the transfer bar 5 in the lowered position, and a second cam surface 15b that holds the transfer bar 5 in the raised position, which are formed at approximately half a circumference each.

On the other hand, the mechanism for moving the transfer bar 5 in the horizontal direction connects a vertical bar 23 that is integral with the transfer bar 5 and a crank arm 16 that rotates integrally with the rotation center O of the rotary cam 15 to a link 17 for advancing and retreating. It is a structure in which the two parts are connected together. The crank arm 16 is arranged so that the rising start point of the pin 6 starts ahead of the conveyance starting point by 1/2 of the cam rotation angle θ necessary for completing the rising end of the pin 6.
The operation start position of the crank arm 16 is shifted in phase from the rotary cam 15 by θ/2. Note that 18 indicates a connection point between the crank arm 16 and the forward/backward link 17.

As illustrated in FIG. 2, the rotational drive mechanism for the rotating cam 15 and crank arm 16 includes a pulley 20 provided in an indexing device 22 that stops the rotating cam 15 for a certain period of time every time the rotating cam 15 rotates once. It is configured such that power is transmitted between the motor 19 and the motor 19 that rotates constantly through a belt 21. Although not shown, the reciprocating direct motion of the piston rod of the cylinder is converted into rotational motion by a rack and pinion, and a one-way clutch is used to prevent the rotation of the pinion from being transmitted to the rotary cam when the piston rod retreats. A device that rotates 15 in one direction may be used.

Next, the operation of the above configuration will be explained. The vertical movement of the transfer fiber 5, that is, the vertical movement of the pin 6, is caused by the rotation of the rotary cam 15.
1 roller 14 contacts the second cam surface 15b, the L-shaped link 11 is moved to the support shaft 1 in FIG.
Rotate to the right using 2 as a fulcrum. As a result, the connecting link 13 moves to the right and rotates the mold link 7 to the left around the support shaft 8. As the mold link 7 pivots to the left, the roller 9 at the tip in the horizontal direction is guided. The transfer bar 5 is moved upwardly through the groove 10 to the upper end of the lift position L shown by the chain line, and the pin 6 is inserted into the pin hole 4 of the workpiece W.

The forward movement of the transfer bar 5 that conveys the workpiece W is performed by turning the crank arm 16, which rotates integrally with the rotating cam 15, to the left in FIG. pivot the link 17 to the left,
The transfer bar 5 is moved forward in the transport direction S via the bar 23.

When the crank arm 16 has turned 180 degrees,
The roller 14 of the L-shaped link 11 has a first cam surface 15a.
The transfer lever 5 is moved downward, and the pin 6 is removed from the pin hole 4 of the workpiece W.
At the same time, from the point where the crank arm 16 exceeds the dead point, the advancing/retreating link 17 is pivoted to the right, and the transfer lever 5 is moved backward to return to its original position.

Therefore, the present invention shifts the operation start position of the crank arm 16 from the conveyance start point to the rotating cam 15 by θ/2 of the cam rotation angle θ required to complete the rising end of the pin 6.
The phase is shifted from As the ascent begins, the crank arm 16 makes an upward turn of θ/2 up to the dead point, moves backward by a horizontal movement amount C, is inserted into the pin hole 4, and rises to intermediate position b, and the crank arm 16 crosses the dead point. When the workpiece W moves forward by a horizontal movement amount C to reach the rising end position c of the lift amount A, it comes into contact with the front wall of the pin hole 4, giving a forward movement to the workpiece W and starting conveyance. .

<Effects of the Invention> As described above, according to the present invention, the point at which the rotating cam starts to lift the pin is started in advance of the conveyance start point by θ/2 of the cam rotation angle θ required to complete the rising end of the pin. , the crank arm's operation start position is shifted from the rotating cam by θ/2, so the pin inserted into the pin hole of the conveyed object moves backward and forward in the horizontal direction to deliver a predetermined amount. Lifting is performed, and the amount of horizontal movement relative to the amount of lift is the amount of backward and forward movement corresponding to the above θ/2, and the amount of horizontal movement of the pin is halved to 1/2 of that of the conventional device. . Therefore, the diameter of the pin hole can be made smaller or the outer diameter of the pin can be made larger, which reduces looseness with the conveyed object and provides highly accurate positioning. In addition, the pin can be inserted into and pulled out from the pin hole of the transported object without stopping the transported object.
This has the effect of shortening the transport cycle time.

[Brief explanation of drawings]

FIG. 1 is a side view of the device of the present invention, FIG. 2 is a view taken along the arrow in FIG.
FIG. 5 is an explanatory diagram showing the upward movement of the pin by the device of the present invention, and FIG. 5 is an explanatory diagram showing the upward movement of the pin by the conventional device. 3...Rail, 4...Pin hole, 5...Transfer bar, 6...Pin, 7..."Mold link, 9...Roller, 1
0... Guide groove, 11... L-shaped link, 13... Connection link, 14... Roller, 15... Rotating cam, 16... Crank arm, 17... Advance/retreat link, 19... Motor.

Claims (1)

[Claims] 1. A transfer bar equipped with a pin inserted into a pin hole drilled in a conveyed object, an elevating link that supports the transfer bar so that it can move forward and backward in the horizontal direction and moves it up and down, and an elevating link that moves the elevating link up and down. In a transfer device comprising a rotating cam that rotates, a crank arm that rotates concentrically with the rotating cam, and an advancing/retracting link that is connected to the transfer bar and moves the transfer bar forward and backward, the rotating cam starts raising the pin. point,
The operation start position of the crank arm was positioned with a phase shift of θ/2 relative to the rotating cam in order to start the operation ahead of the conveyance start point by θ/2 of the cam rotation angle θ required to complete the rising end of the pin. A transfer device characterized by: