JPS61293758A - Transfer device - Google Patents

Abstract

PURPOSE:To enhance the locational accuracy and shorten the transport cycle by shifting the phase of the a crank arm in its operation start position by an angle of theta/2 with respect to a rotary cam in a transfer device which is to transport objects such as works to be machined. CONSTITUTION:A rotary cam 15 rotates in the direction of arrow to cause rightwise rotation of an L-shaped link 11 with 12 as fulcrum, and a coupling link 13 turns leftwise another L-shaped link 7 at a fulcrum 8 to allow a roller 9 at the tip to elevate a transfer bar 5 till the upper limit of the lift position L through a guide groove 10, and thus a pin 6 is set in a pin hole 4 in a work W. When a crank arm 16 to rotate together with rotary cam as in a single piece has turned leftwise 180 deg. over the dead point, a bar 23 advances said transfer bar 5 in the S direction through an advance/retraction link 17, to become opposite movement when 180 deg. is filled, that is the initial state. The phase of crank arm 16 in its operation start position is shifted by half the cam rotation angle theta necessary for elevation of the pin 6, and therefore the horizontal motion of pin becomes 1/2 to allow lessening of the pin hole, which should enhance the locational accuracy.

Description

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

<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 rotated via the lifting link. A slide carry type transfer device is known in which a workpiece is moved up and down by a cam, and a crank arm that rotates concentrically with the rotary cam moves the transfer bar forward and backward through a forward and backward link to convey the workpiece.

<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. Start, insert the pin into the hole H at the intermediate rising point, and insert it into the pin hole H at the rising end completion point C.
comes into contact with. 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 sets the starting point of the pin ascent by the rotary cam to the cam rotation angle required to complete the rising end of the pin from the conveyance starting point. In order to start the operation in advance by θ/2 of θ, the operation start position of the crank arm is set at θ/2.
It is positioned with a phase shift relative to the rotating cam.

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 at 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.

<Embodiments> Examples of the present invention will be described below based on FIGS. 1 to 4. In FIGS. 1 to 3, 1 is a base, and 2 is a column erected on the base l. 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 hole 4 in the vertical direction into which a pin 6, which will be described later, is inserted and removed.

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 shown in chain lines, and moves horizontally forward and backward by a predetermined amount. To explain its specific configuration, the transfer bar 5 is provided with a horizontally long guide groove lO,
The "
A roller 9 attached to the horizontal tip of the mold link 7 is inserted into the guide groove IO and supports the transfer bar 5. This mold link 7 is a part of the elevating link that moves the transfer bar 5 up and down. It is composed of an L-shaped link 11 that has been attached, and a connecting link 13 that connects the vertical tip of this L-shaped link 11 and the vertical tip of the above-mentioned "type link 7." At the horizontal end of the roller 1, which is always in contact with the cam surface of the rotating cam 15,
4 is installed.

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

On the other hand, the mechanism for moving the transfer bar 5 in the horizontal direction connects the vertical bar 23 that is integrated with the transfer bar 5 and the crank arm 16 that rotates integrally with the rotation center 0 of the rotary cam 15 to the link 17 for moving the transfer bar 5 back and forth in the horizontal direction. 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 a binion, and a one-way clutch is used to prevent the rotation of the binion from being transmitted to the rotating cam when the piston rod retreats. Rotating cam 15
A device that rotates in one direction may be used.

Next, the operation of the above configuration will be explained. The vertical movement of the transfer bar 5, that is, the vertical movement of the pin 6, is caused by the rotation of the rotary cam 15 causing the roller 14 of the L-shaped link 11 to come into contact with the second cam surface 15b, thereby moving the L-shaped link 11 to the first position.
In the figure, it pivots to the right using the support shaft 12 as a fulcrum. As a result, the connecting link 13 moves to the right and "type link 7
pivots to the left about the spindle 8. "Type link 7
With the leftward turning movement, the roller 9 at the tip in the horizontal direction moves into the guide groove 10.
The transfer bar 5 is moved upwardly to the lifting end of the lift position indicated 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 as follows:
The crank arm 16, which rotates integrally with the rotary cam 15, turns to the left in FIG. The transfer bar 5 is moved forward in the conveyance direction S through the transfer bar 5.

When the crank arm 16 has turned 180 degrees, the roller 14 of the L-shaped link 11 comes into contact with the first cam surface 15a, moves the transfer bar 5 downward, and removes the pin 6 from the pin hole 4 of the workpiece W. do. At the same time, crank arm 1
Advance/retreat link 1 from where 6 crosses the dead point
7 to the right axis, the transfer bar 5 is moved backward and returned to its original position.

Therefore, in the present invention, the operation start position of the crank arm 16 is shifted in phase with respect to the rotary cam 15 by θ/2 of the cam rotation angle θ necessary for completing the rising end of the pin 6 from the conveyance start point, and Since the ascent start point is set to be θ/2 ahead of the conveyance start point, the pin 6 is at the descending end position ea as shown in FIG. The crank arm 16 is inserted into the pin hole 4 while moving backward by the amount of horizontal movement C during an upward turn of θ/2 up to the point where it rises to the intermediate position, and when the crank arm 16 crosses the dead point, it changes to forward movement and lifts. When the workpiece W moves forward by the horizontal movement amount C to the ascending end position C of the amount A, it comes into contact with the front wall of the pin hole 4 to give a forward movement to the workpiece W and start 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. Since the crank arm's operation start position is shifted from the rotating cam by θ/2 in phase, the pin inserted into the pin hole of the conveyed object moves backward and forward in the horizontal direction to move a predetermined amount. Moreover, the amount of horizontal movement relative to the amount of lift is the amount of backward and forward movement corresponding to the above-mentioned θ/2, and the amount of horizontal movement of the pin is halved to 1/2 of that of the conventional device. Ru. 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. Furthermore, since the pins can be inserted into and pulled out of the pin holes of the transported object without stopping the transported object, there is an effect that the transport cycle time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a side view of the device of the present invention, Fig. 2 is a view in the direction of the ■ arrow in Fig. 1, Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 shows the upward movement of the pin by the device of the present invention. 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... Type link, 9...
Roller, 10... Guide groove, 11... L-shaped link, 1
3... Connecting link, 14... Roller, 15... Rotating cam, 16... Crank arm, 17... Advance/retreat link, 19... Motor.

Claims (1)

[Claims] 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 a horizontal direction and moves it up and down;
In a transfer device comprising a rotating cam that moves the lifting link up and down, a crank arm that rotates concentrically and integrally with the rotating cam, and an advancing/retracting link that is connected to the transfer bar and moves the transfer bar back and forth, the rotating In order to start the point at which the cam starts raising the pin by θ/2 of the cam rotation angle required to complete the rising end of the pin from the conveyance start point, the rotation cam moves the operation start position of the crank arm by θ/2. A transfer device characterized in that it is positioned out of phase with respect to the transfer device.