JPS6128667Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to a sequential feeding device for parts used in automatic assembly machines, etc.

(B) Prior Art A configuration in which parts are supported on a guide rail device and the parts are sequentially sent downstream is often employed in automatic assembly processes. By the way, while the parts are being fed sequentially along the guide rail device, there also arises a demand for reversing the front and back of the parts. In response to such a request, a generally considered means is to arrange a rotary table in the middle of the guide rail device, place the parts on this table, and change the direction of the parts. At this time, care must be taken to prevent parts from being ejected from the table due to centrifugal force. Generally, when supporting parts on a rotating table, the parts are often firmly fixed using clamps. An example of this is
- It can be seen in Publication No. 19162. However, the device described in this publication, which requires clamping and unclamping operations using an air cylinder, is too exaggerated for the purpose of preventing parts from being moved by centrifugal force, and also takes a long time to operate. However, it was difficult to meet the demand for parts to be flown in a fast takt time.

(c) Problems to be solved by the invention The invention provides a reversing table in the middle of the guide rail device for transporting parts so that the parts can be turned back and forth as appropriate, and also uses centrifugal force to eject the parts from the table. It is designed to prevent this with a simple configuration.

(d) Means for solving the problem In the present invention, an inversion table is arranged between the upstream guide rail and the downstream guide rail, and
A pin is attached to this inversion table. This pin is in contact with a stationary cam placed under the reversing table via a cam follower, and only when relative movement occurs between the pin and the stationary cam as the table is reversed, the parts supported by the table It protrudes laterally by a cam action.

(e) Function When the reversing table starts rotating, the pin protrudes to the side of the part each time. Therefore, the pin prevents parts from being ejected due to centrifugal force.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.
The progressive feed device 1 has an upstream guide rail device 2 and a downstream guide rail device 3. The guide rail devices 2, 3 consist of stationary rails 4, 5 and movable rails 6, 7, and are configured to support a plate-shaped component 8, such as a printed circuit board. Specifically, the side edges of the parts 8 are supported on the upper surfaces of the rails, and positioning in a direction perpendicular to the direction of movement is performed by guide rollers 9 mounted on each rail in a row. As seen in FIGS. 5 and 6, the movable rails 6, 7 are urged by the spring 10 in the direction away from the stationary rails 4, 5, and the cam followers 11, 1
2 is pushed by cams 13 and 14 and fixed rails 4 and 5
The interval is adjusted. 15, 15... are feed claws arranged above the guide rail devices 2, 3, and a drive mechanism (not shown) combining cams, links, etc.
The machine performs a parallelogram motion as shown in FIG. 1, and feeds the parts one pitch at a time.

Reference numeral 16 denotes a reversing table arranged so as to communicate the upstream guide rail device 2 and the downstream guide rail device 3, and is fixed to the top end of a vertical shaft 18 that is pivotally supported by a bearing sleeve 17. The vertical shaft 18 is connected to a divided rotation device such as a Geneva mechanism, and rotates 180 degrees each time a rotation command is issued. A pair of component guide plates 19 and 20 are placed on the upper surface of the reversing table 16 so as to face each other. Cam followers 21 and 22 have cam follower rollers 23 and 24, and are connected to component guide plates 19 and 20 through notches 25 and 26 formed in the reversing table 16. Component guide plates 19, 20 and cam followers 21, 22
The direction of movement of is restricted only to centripetal and centrifugal directions. That is, a guide bar holder 27 is fixed to the vertical shaft 18, and a pair of horizontal guide bars 28 are held by this holder 27. The guide bars 28, 28 pass through the cam followers 21, 22, and the cam followers 21, 22 pass through the guide bar 2.
8 and 28.
There are seat plates 29 at both ends of the guide bar 28 to prevent them from coming off.
are fixed, and the cam followers 21 and 22 are normally pressed against the seat plate 29 by a compression coil spring 30 fitted to the guide bar 28. Assuming that the component 8 is the largest component handled by this device, the width between the component guide plates 19 and 20 is equal to the width of the cam follower 21,
The guide width of the part 8 is set when the part 22 is pushed outward to the maximum extent. Similarly, the guide rail devices 2, 3 are adapted to form a guide width for the component 8 when the movable rails 6, 7 are furthest from the stationary rails 4, 5. Reference numeral 31 denotes a cam having a cam surface 32 forming an approximately semicircular arc, which is provided corresponding to the cam follower rollers 23 and 24.
or 7, or both, by suitable means, so that the position can be changed together with the movable rails 6, 7.

A shallow groove 33 is provided on the surface of the reversing table 16 so that the feed pawl 14 does not come into contact with it. 34
are pins that vertically penetrate the reversing table 16, and a total of four pins are arranged near both ends of the groove 33, one pair each. Each pair of pins 34 is held vertically freely by a bearing body 35 fixed to the lower surface of the reversing table 16, and a cam follower 36 having a cam follower roller 37 is fixed to the lower end thereof. A stationary face cam 38 fixed to the upper end of the bearing sleeve 17 is supported by the cam follower roller 37 . The face cam 38 has a recess 39 located in line with the advancement line of the component 8, and when the cam follower roller 37 falls into the recess 39, the upper end of the pin 34 sinks below the support level of the component 8, and the cam follower roller 37
When the pin 34 comes out from there, the pin 34 rises above the support level of the component 8. In order to ensure contact between the face cam 38 and the cam follower roller 37, a compression coil spring 40 is inserted between the bearing body 35 and the cam follower 36. Reference numeral 41 denotes a component front/back discriminating device disposed at a stage before the upstream guide rail device 2, which determines whether the front/back direction of the component is correct by means such as photo sensing.

The device 1 operates as follows. Feed claw 1
Due to the parallelogram motion of 5, 15, . At this time, the pin 34 is below the support level of the component 8, and the inversion table 1 of the component 8
6 and transition from there to the downstream guide rail device 3. Now, inversion table 16
When the part 8 taken in is a part that is determined to be upside down by the discriminator 41, the reversing table 16 rotates 180 degrees during the rising period of the feed claw 15 as shown in FIG. reorient. While the reversing table 16 is rotating, the pin 34 rises to the side of the component 8 and prevents the component 8 from being thrown out of the table due to centrifugal force. cam 3
At this time, the guide plates 19 and 20 are at a position where they do not affect the cam followers 21 and 22, and the distance between the guide plates 19 and 20 remains at a width sufficient to guide the component 8. The part 3 whose direction has been corrected is the feed claw 1 which has entered the downward phase.
5 to the downstream guide rail device 3.

FIG. 6 shows a situation in which small parts 42 are handled. The parts 42 are also fed by the same pitches as the parts 8, and are fed into the reversing table 16 one by one.
At this time, the movable rails 6 and 7 are pushed by the cams 13 and 14, forming a narrower guide interval between them and the stationary rails 4 and 5 than before, and the cam 31 is also moved closer to the vertical axis 18. It's moving. Therefore, in the state shown in FIG. 6, the cam follower roller 23 of the guide plate 19 is pressed toward the center of the table by the cam 31, and the guide plate 19 approaches the guide plate 20 to form a guide width for the component 42. . When the reversing table 16 rotates 180 degrees, the cam follower roller 23 separates from the cam 31, so the guide plate 19 moves outward and settles at the position where the guide plate 20 was, and conversely, the guide plate 20 moves outward. Since the cam follower roller 24 comes into contact with the cam 31 and is pushed, it moves inward and settles at the position where the guide plate 19 was until now. Therefore, the guide surfaces of the guide plates 19, 20 are always aligned with the component guiding lines of the stationary rails 4, 5 and the movable rails 6, 7, and changes in component size can be automatically accommodated.

(g) Effects of the invention In this invention, a stationary cam is arranged relative to the reversing table, and each time the reversing table rotates, the pin is protruded from the table by the cam action of the immovable cam to prevent parts from protruding. The desired purpose can be achieved with a simple configuration, there is no need to spend time exchanging operation signals as in the case of clamping/unclamping with an air cylinder, and it can follow the high-speed movement of the reversing table well. be.

[Brief explanation of the drawing]

The figures show one embodiment of the device of the present invention, FIGS. 1 and 2 are perspective views in different states, FIG. 3 is a side view of a partially broken reversing table, and FIG. 4 is a third
A cross-sectional view of the reversing table section taken in a direction perpendicular to the drawing, FIG. 5 is a partially cross-sectional plan view explaining the feeding situation of wide parts, and FIG. FIG. 7 is a plan view similar to the one shown in the figure, and FIG. 7 is a plan view of a cam for a component guide plate. 2...Upstream guide rail device, 3...Downstream guide rail device, 16...Reversing table, 34
...pin, 36...cam follower, 38...immovable face cam (immovable cam).

Claims (1)

[Claims for Utility Model Registration] An upstream guide rail device and a downstream guide rail device that support parts to be fed sequentially are arranged so as to communicate with each other, and the parts fed from the upstream side are moved back and forth as appropriate. A reversing table that is inverted and passed to the downstream side; and a reversing table that is attached to the reversing table and is in contact with a stationary cam placed under the table via a cam follower, and as the table is reversed, the contact between the stationary cam and the stationary cam is A device for progressively feeding parts, comprising a pin that protrudes to the side of the part supported by the table by a cam action to prevent the part from coming off due to centrifugal force only when a relative movement occurs between the parts.