JPH0217725Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention cuts the lead wires of electronic components inserted into the printed circuit board to the required length, and folds the lead wires along the bottom surface of the printed circuit board. This invention relates to a lead wire cutting and bending mechanism for bending.

(Prior Art and Problems) Recently, with the automation of inserting electronic components into printed circuit boards, devices have been proposed that automatically cut and bend lead wires of inserted electronic components. However, conventionally used devices of this type generally have a structure in which the lead wires of two-legged electronic components such as capacitors and resistors are cut and bent in one direction, either outward or inward. Ta. Therefore, we have developed a lead wire cutting and bending mechanism that can simultaneously cut and bend the lead wires of three-legged electronic components such as transistors, and can also selectively bend outward or inward depending on the component. There was an urgent need to many.). Furthermore, it is desired that cutting and bending operations can be performed at high speed and with high reliability.

In view of the above points, the present invention has developed a lead wire that can quickly switch between outward bending and inward bending, and can perform cutting and bending operations at high speed and with high reliability using a cam drive. The purpose is to provide a cutting and bending mechanism.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a fixed block in which holes on both sides and a central hole are formed in the fixed blade at the tip, and a movable vertically movable fixed block fixed to the tip. a main shaft; a pair of side levers having at their tips side movable blade members that slide on the fixed blade surface to cut and bend the lead wires located in the holes on both sides; a central lever having a central movable blade member at its tip that slides to cut and bend the lead wire located in the central hole; an elevating cam and an elevating cam follower that is driven by the elevating cam and elevating the main shaft; a cutting and bending cam, a cutting and bending cam follower driven by the cutting and bending cam, a first link, a second link connected to this, and one end at the connection point of the first and second links; a toggle link configured with a third link connected to the cutting and bending cam follower; and an outer bending/inner link provided on the third link whose other end is connected to the cutting and bending cam follower and extending and contracting the length of the third link. a bending switching cylinder; a slide connection member connected to the rear end side of the main shaft via the first and second links; and a slide connection member that operates the side levers and the center lever in conjunction with the vertical movement of the slide connection member. It has a structure that includes a rotating mechanism.

Then, by changing the length of the third link with the cylinder for switching outward bending/inward bending,
The position of the slide connecting member before cutting the lead wire is changed, and the side movable blade member moves from the outside to the inside on the fixed blade surface to cut and bend the lead wire, or from the inside to the outside. It is designed to switch between cutting and bending the lead wire by moving toward the direction.

(Example) Hereinafter, an example of the lead wire cutting and bending mechanism according to the present invention will be described with reference to the drawings.

1 to 4 show a mechanism for raising and lowering a main shaft 1 to which a fixed blade, side levers and central lever are attached, and a mechanism for driving each lever. In addition, FIGS. 5 to 9 show the fixed blade 3,
The mechanisms of the side levers 11A, 11B and the central lever 21 are shown.

First, FIGS. 5 to 9 will be explained. In these figures, a fixed block 2 is fixed to the upper end of a main shaft 1, and the upper end of this fixed block 2 serves as a fixed blade 3. As shown in FIG. 8, this fixed blade 3 has holes 4A and 4 on both sides.
B and a central hole 5 are formed. These side holes 4A, 4B and the center hole 5 are for connecting the three lead wires 9A, 9 of the electronic component 9 inserted into the printed circuit board 8.
B and 9C, and the inner surfaces of the side holes 4A and 4B and the central hole 5 and the fixed blade surface form an acute angle in the portion related to lead wire cutting. A hollow portion 6 is formed in the fixed block 2 and communicates with the holes 4A, 4B on both sides and the center hole 5, and a chip discharge pipe 7 is connected and fixed to the lower end opening of the hollow portion 6, respectively.

The fixed block 2 has pins 10A and 10B.
A pair of side levers 11A, 11B are pivotally connected by the side levers 11A, 11B, and the side levers 11A, 11B cut the lead wires 9A, 9B of the electronic component 9 located in the holes 4A, 4B on both sides, as shown in FIG. It has a lateral movable blade member 12 at its tip for bending. As can be seen from FIG. 9, this side movable blade member 12 constitutes a canopy-like portion that slides on the blade surface of the fixed blade 3.

Further, horizontal holes 13 are formed in the fixed block 2 on the left, right and in the middle, through which a detection terminal 15 having a lead wire insertion hole 14 is inserted while being electrically insulated from the fixed block 2, as shown in FIG. There is. Each detection terminal 15 is positioned so that the lead wires 9A, 9B, 9C inserted into the side holes 4A, 4B and the center hole 5 pass through the lead wire insertion hole 14, and when cutting, the detection terminal 15 and the side levers 11A, 11B The presence or absence of the lead wire, that is, the presence or absence of an electronic component, is detected by electrically shorting between the lead wire and the central lever 21.

Side levers 11A, 11 of the fixed block 2
A central lever 21 is pivotally attached to the side surface of B, which is perpendicular to the mounting surface, by a pin 20. The central lever 21 has a central movable blade member 22 at its tip for cutting and bending the lead wire 9C located in the central hole 5. Here, the central movable blade member 22 is
It slides on the fixed blade surface in a direction that traverses a straight line connecting the holes 4A and 4B on both sides.

1 to 4, the main shaft 1 is mounted on a base 3 fixed on a main body frame 60.
It is provided so that it can be raised and lowered in the vertical direction with respect to 0.
That is, an outer cylinder 31 and a ball bush (thrust bearing) 32 are fixed to the base 30, and the main shaft 1 is slidably fitted inside these. A gear 33 is fixed in the middle of the main shaft 1, so that the direction of the main shaft 1 can be changed.

A connecting member 34 is rotatably connected to the lower end of the main shaft 1, and a connecting pin 3 is connected to the connecting member 34.
5 is fixed in the horizontal direction. A lifting link 36 is connected to the connecting pin 35, a first link 37A for forming a toggle link, and a rising position regulating link 38 are connected. The first link 37A is connected to the slide connecting member 44 via a second link 37B which together constitutes a toggle link. A lifting position regulating lever 40 is pivotally supported on the lower surface of the base 30 via a bracket 39.
The upper end of the ascending position regulating link 38 is connected to the middle of the 0. Further, a stopper 41 for regulating the rising position is fixed to the lower surface of the base 30, and comes into contact with the tip of the lever 40 when it rises.

On the other hand, as shown in FIGS. 3 and 4, the lifting cam 50 and the cutting and bending cam 51 are connected to the rotating shaft 5
The cam 50 is in contact with a roller 54 of a lifting cam follower 53, and the cam 51 is in contact with a roller 56 of a cutting and bending cam follower 55. These cam followers 53 and 55 are pivotally supported by a shaft 62 supported by a bracket 61 fixed to a main body frame 60.
The tip of the elevating cam follower 53 is connected to the lower end of the elevating link 36. A manual lifting cylinder 63 is inserted in the middle of the lifting link 36. Further, the tip of the cutting and bending cam follower 55 is connected to one end of the third link 37C forming a toggle link. The other end of the third link 37C is the first and second link 37A,
It is connected to the connection point of 37B. 3rd link 3
A cylinder 64 for switching between outward bending and inward bending (also for manual cutting and bending) is inserted in the middle of 7C, and the length of the third link 37C is expanded and contracted to switch between outward bending and inward bending. It's getting old. Further, an operation starting cylinder 65 is provided between the elevating cam follower 53 and the bracket 61.

The movement of the slide connecting member 44 is transmitted to the side lever brackets 47A, 47B through the upper and lower slide members 45, 46 as shown in FIG. 2, and to the center lever bracket 48 as shown in FIG.
And side lever brackets 47A, 47B
As shown in FIG. 5, the rear ends of the side levers 11A and 11B are connected to each other via links 49, respectively. Further, the rear end of the center lever 21 is connected to the center lever bracket 48 via a link 49A as shown in FIG.

(Operation of the embodiment) In the above embodiment, in the standby state until the electronic component 9 is inserted into the printed circuit board 8, the operation start cylinder 65 is in the retracted state, and the lifting cam 5 is in the retracted state.
0 and the elevating cam follower 53 is released, and the main shaft 1 is placed on standby in a lowered state.

When the electronic component 9 begins to be inserted into the printed circuit board 8, the operation start cylinder 65 extends, and the elevating cam follower 53 comes to interlock with the elevating cam 50.

When the cylinder 64 for switching outward bending/inward bending on one side of the toggle link is contracted, the first link 37A and the second link 3 constituting the toggle link are
7B extends in a straight line as shown in FIG. On the other hand, each lead wire 9A, 9B, 9C is received in the posture of the side levers 11A, 11B shown in FIG. 5, and the lead wires are bent outward. That is, the side lever brackets 47A, 47B are moved from the raised position to the 11th position.
As shown in Figure B, the toggle link bends into a dogleg shape to lower the side lever 11.
The side movable blade members 12 at the tips of the blades A and 11B slide on the blade surface of the fixed blade 3 in directions that open left and right from a position close to the center of the fixed blade 3, respectively, to cut the lead wires 9A and 9B, and cut the lead wires 9A and 9B. The remaining parts of 9A and 9B are 12th
Fold it outward as shown in Figures A and B.

At the same time as this operation, the center lever bracket 4
8 is also lowered from the raised position by the action of the toggle link, the central lever 21 rotates clockwise, and the central movable blade member 22 cuts the lead wire 9C and bends the remaining portion.

After the main shaft 1 is lowered, the toggle link returns to the straightly extended state shown in FIG. 11C.

Further, when the cylinder 64 for switching outward bending/inward bending is extended, the first link 37A and the second link 37B constituting the toggle link are in the thirteenth position.
As shown in FIG. 7th
Each lead wire 9A, 9B is received in the posture of the side levers 11A, 11B shown in the figure, and the lead wires are bent inward. That is, the side lever bracket 37
A, 37B rises from the lowered position by extending the toggle link in a straight line as shown in Fig. 13B,
As a result, the side movable blade members 12 at the tips of the side levers 11A and 11B slide on the blade surface of the fixed blade 3 in the closing direction from both ends of the fixed blade 3 to cut the lead wires 9A and 9B. , the remaining portions of the lead wires 9A and 9B are bent inward as shown in FIG.

After the main shaft 1 is lowered, the toggle link returns to the dogleg shape shown in FIG. 13C.

In addition, if there is a mistake in inserting an electronic component into a printed circuit board, a mistake occurs in the cutting/folding operation, or during maintenance and inspection, manual operation may be required instead of using the cam mechanism. be. At this time, the main shaft 1 is lifted and lowered by the expansion and contraction operation of the manual lifting cylinder 63, and the cylinder 64 for switching outward bending and inward bending (also for manual cutting and bending) is expanded and contracted to move each side. Levers 11A, 11B and central lever 2
1 to perform outward bending or inward bending.

According to the above embodiment, the following effects can be achieved.

(1) A fixed blade 3 having holes 4A and 4B on both sides and a center hole 5, a pair of side levers 11A and 11B that slide on the fixed blade surface along the direction in which the holes are arranged on both sides,
Since it is equipped with a central lever 21 that slides on a fixed blade surface in a direction transverse to the direction in which both holes are arranged, it is possible to cut and bend lead wires of two-legged and three-legged electronic components.

(2) By changing the posture of the side levers 11A and 11B in the standby state, it is possible to bend the lead wires outward and inward. This switching between outward bending and inward bending of the lead wire is performed by the toggle links (first, second and third links 37A, 37B, 37
C) and a cylinder 64 for switching outward bending/inward bending inserted in the middle of the third link 37C.

(3) Side levers 11A, 11B and center lever 2
1 is driven by a link mechanism that interlocks with a cam mechanism, making it possible to increase the speed and improve reliability (air cylinders have a problem with increasing the speed).

Note that the support structure of the main shaft 1, the specific configuration of the link mechanism, etc. can be changed as appropriate.

(Effects of the invention) As explained above, according to the lead wire cutting and bending mechanism of the present invention, the holes on both sides and the center hole are formed in a fixed blade, and a pair of lead wires located in the holes on both sides are connected. By cutting and bending the lead wire located in the central hole using the side lever, the lead wire located in the center hole can be cut and bent using the central lever.
It is possible to cut and bend the lead wires of main electronic components, and to drive each lever at high speed and reliably using the cam and link mechanism.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of the lead wire cutting and bending mechanism according to the present invention, and is a partially cross-sectional side view mainly showing the link mechanism part that operates the main shaft, and Fig. 2 is a front cross-section of the same. Figure 3 is a side view showing the cam mechanism part of the embodiment, Figure 4 is a plan view of the same, and Figure 5 shows the fixed blade, side lever, and its drive mechanism part of the embodiment outside the lead wire. FIG. 6 is a partially cross-sectional side view showing the fixed blade, central lever, and its drive mechanism of the embodiment; FIG. 7 is a partially cross-sectional side view showing the embodiment. Fig. 8 is a plan view of the fixed blade, and Fig. 9 is a side view of the fixed blade, the side lever, and its drive mechanism, with a part cut away, showing the case where the lead wire is bent inward. 10 is a plan view of the detection terminal; FIGS. 11A, B, and C are explanatory diagrams showing the operation of the toggle link when performing outward bending;
2A is a bottom view showing the lead wire bent outward; FIG. 12B is a side view of the same; FIGS. FIG. 14 is a side view showing the lead wire in an inwardly bent state. 1... Main shaft, 2... Fixed block,
3... Fixed blade, 4A, 4B... Holes on both sides, 5... Center hole, 8... Printed circuit board, 9A, 9B, 9C...
...Lead wire, 11A, 11B...Side lever, 1
2... Side movable blade member, 15... Detection terminal, 21
... Central lever, 22 ... Central movable blade member, 3
6, 37A, 37B, 37C, 38... link,
44...Slide connection member, 50, 51...Cam, 63, 64, 65...Cylinder, 47A, 4
7B... Bracket for side lever, 48... Bracket for center lever.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fixed block 2 in which a fixed blade at the tip is formed with holes on both sides and a center hole, a main shaft 1 that is movable up and down to which the fixed block is fixed to the tip, and the fixed blade. A pair of lateral levers 11A, 11 having lateral movable blade members at their tips that slide on the surface to cut and bend the lead wires located in the holes on both sides.
B, a central lever 21 having at its tip a central movable blade member that slides on the fixed blade surface to cut and bend the lead wire located in the central hole; an elevating cam and a central lever 21 driven by the elevating cam; a lifting cam follower that raises and lowers the main shaft; a cutting and bending cam; a cutting and bending cam follower driven by the cutting and bending cam; a first link 37A; a second link 37B connected thereto; a toggle link configured with a third link 37C having one end connected to the connection point of the first and second links; and a toggle link provided on the third link 37C having the other end connected to the cutting and bending cam follower. a cylinder 64 for switching between external bending and internal bending that expands and contracts the length of the third link; a slide connecting member 44 that is connected to the rear end side of the main shaft via the first and second links 37A and 37B; a mechanism for rotating the side levers and the center lever in conjunction with the vertical movement of the slide connecting member 44;
By changing the length of the third link 37C, the position of the slide connecting member 44 before cutting the lead wire is changed, and the side movable blade member moves from the outside to the inside on the fixed blade surface. A lead wire cutting and bending mechanism that switches between cutting and bending the lead wire by moving the lead wire and cutting and bending the lead wire by moving from the inside to the outside. (2) The side movable blade member slides on the fixed blade surface along the direction in which the holes on both sides are arranged, and the central movable blade member slides on the fixed blade surface in a direction substantially perpendicular to the direction in which the holes on both sides are arranged. The lead wire cutting and bending mechanism according to claim 1, which is a device that slides on a surface.