JPH1119740A - Motor-driven press device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the linear change of the feed stroke of a feed arm, to shorten the feed movement of a lead frame and an index time, and to facilitate stroke adjusting working by changing a distance from the fixed fulcrum of an oscillating arm to a movable fulcrum in the longitudinal direction of the oscillating arm. SOLUTION: A press movement is performed by moving vertically an upper die, and since the lead frame is sent by synchronizing feed mechanism 4 and feed plate vertical moving mechanism 5 through a drive transmission mechanism 3, working efficiency is enhanced by shortening the feed of the lead frame and the index time of press working. The curves of cam 11 for feeding and cam 12 for vertical moving, which are provided on the drive transmission mechanism 3, have been made to low speed curves in the start of feeding and before stopping. Therefore, the damage of a feed pin 80a is reduced. A guide roller 30b can be moved, a distance between first fulcrum 31 and second fulcrum 37 can be changed, and the feed stroke of a feed arm 80 can be changed in a straight line shape. Feed stroke adjusting working is very simple, and operability and workability are satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric press apparatus for performing press working by feeding a lead frame having a perforated hole to a press section equipped with a press die at a pitch.

[0002]

2. Description of the Related Art A resin mold type semiconductor device is subjected to processes such as dam bar cutting and lead forming after resin molding. These processes are performed by a press device provided with a press die. This press machine
Generally, an upper die and a lower die are positioned between a punch holder for supporting a punch and a die holder for supporting a die, and are set in a press device. It is configured to perform press working while guiding with a guide post erected over the upper mold.

Further, as a lead frame feeding mechanism in the above-mentioned press apparatus, the present applicant has disclosed Japanese Patent Laid-Open No. 6-773.
No. 76 has proposed an apparatus. The feed mechanism will be described. In FIG.
In the press position, both sides thereof are supported by feed plates 103a and 103b provided above the die 102, and the feed plates 103a and 103b are connected to connecting members 104a and 104b. The feed plates 103a and 103b are configured to be vertically movable by a vertical movement mechanism described later. Further, the lead frame 101 is provided with a feed plate 103a, 1
When 03b is pushed down, it is engaged with the pilot pin 117 provided on the die block 116 and positioned.
Reference numeral 118 denotes an error detection pin for detecting whether the lead frame is set at a predetermined position. Further, the lead frame 101 is provided with a feed arm 105a, 1 shown in FIG.
05b, the feed hole 101a of the lead frame 101
Feed pins 106a and 106b which can be engaged from above are vertically provided. The feed arms 105a and 105b are
For example, it is configured to reciprocate in the left-right direction in FIG. 9 by a reciprocating mechanism that reciprocates by a cylinder drive (air cylinder).

The above-mentioned feed plates 103a, 103b
Is a rod 10 urged by coil springs 107a, 107a mounted on a base 107 shown in FIG.
8a, 108b urges and supports upward. Further, the connecting members 104a and 104b are
9a, 109b, and the engaging members 109a,
The lower ends of the rods 110, 110, which are respectively suspended from 109 b, are swinging pieces 112 fixed to a rotating shaft 111.
a and 112a so as to be vertically movable.
A swinging piece 112b is fixed to the rotating shaft 111, and a cylinder rod of a cylinder 113 is connected to the swinging piece 112b. By operating the cylinder 113, the rotating shaft 111 is rotated, and the swinging piece 1 is rotated.
12a, 112a, rods 110, 110, engaging member 1
09a, 109b, feed plate 103a,
103b can be lowered against the urging force of the coil spring 107a.

In the above press apparatus, a feed cylinder (not shown) is operated to feed arms 105a, 105b.
When the lead frame 101 is fed by one pitch, the cylinder 113 is operated to feed the feed plates 103a, 103a.
03b is lowered, and the feed pins 106a and 106b are pulled out of the feed holes 101a of the lead frame 101. Then, the electric motor or the hydraulic mechanism is operated to operate the upper mold 1.
14, the stripper plate 115 is lowered to a position where the feed plates 103a and 103b are pressed down, and press working is performed. When the pressing is completed, the feed arm 105 is moved while the upper mold 114 moves upward.
a and 105b are moved to a position corresponding to the die 102, and the cylinder 113 is operated to move the feed plates 103a and 103b upward.
a, 106b are connected to the feed plates 103a, 103
b and engages with the feed hole 101a of the lead frame 101 which moves upward. Then, the feed arm 105
a and 105b are moved to feed the lead frame 101 by one pitch, and the above-described press working is repeatedly performed.

[0006]

In the above press apparatus, the upper die 114 is moved up and down by an electric motor or a hydraulic mechanism, and the feed arms 105a and 105b are driven by cylinders.
And the vertical movement of the feed plates 103a and 103b by the cylinder 113 are operated while electrically synchronized, so that it takes time to perform one cycle of press working (maximum). At 70s
pm), and it was difficult to shorten the cycle time (index time). This is the same in a press device that employs vertical movement of the upper mold section 114 by hydraulic drive. In addition, since the number of parts is large, the manufacturing cost is increased and the size of the apparatus is increased. Also, the feed arm 10
Because 5a and 105b are sent by cylinder drive,
Since the feed is performed at a constant speed, an impact is applied before the lead frame 101 starts to be fed and before the lead frame 101 is stopped, so that the lead frame 101 is easily damaged. Also, the feed pins 106a and 106b were easily damaged.

Further, since the pitch of the feed holes 101a of the lead frame 101 changes depending on the type of the lead frame, it is necessary to adjust the feed stroke to the press section. In this case, a feed arm 105 driven by a cylinder is used.
It is necessary to adjust the lengths of stopper bolts and the like that define the moving range of a and 105b, and the press work must be interrupted to adjust the feed amount, which lowers the work efficiency. When the lead frame is mis-set, the operation of the press device is stopped, and the drive mechanism for the upper mold section 114, the drive mechanism for the feed arms 105a and 105b, and the vertical movement mechanism for the feed plates 103a and 103b are separately provided. And the lead frame had to be removed and the repair work was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the index time required for the lead frame feeding operation and press working, and to adjust the feed stroke when changing the type of the lead frame. It is another object of the present invention to provide an electric press device which can easily perform the operation of removing the lead frame when the lead frame is mis-set.

[0009]

The present invention has the following arrangement to achieve the above object. That is, in an electric press device that performs press working by pitch-feeding a lead frame having a perforated hole to a press unit equipped with a press die,
A feed arm having a pin engageable with a feed hole of the lead frame, a feed mechanism for reciprocating the feed arm in a direction in which the lead frame is transported, and the press unit capable of moving the lead frame in the transport direction. A feed plate provided so as to be guided and supported and capable of moving up and down, a feed plate moving mechanism for moving the feed plate up and down, and a feed cam provided on a cam shaft while driving the press unit. A drive transmission mechanism that rotationally drives a vertical movement cam to transmit drive to the feed mechanism and the feed plate vertical movement mechanism; and an electric motor that operates the drive transmission mechanism, wherein the feed mechanism includes the feed cam. A moving body is connected via a movable fulcrum to an oscillating arm that oscillates around a fixed fulcrum by pressing against the Converting the swing of the swing arm into a direct movement of the movable body that is directly linked to the reciprocating movement of the feed arm, and changing a distance from a fixed fulcrum of the swing arm to the movable fulcrum in a longitudinal direction of the swing arm. Thus, the feed stroke of the feed arm can be changed linearly.

When the electric motor is started, the drive transmission mechanism reciprocates the press die and the feed cam and the vertical movement cam provided on the same cam shaft. Preferably, the lead frame is pitch-fed by alternately performing forward and backward movements of the feed arm and upward and downward movements of the feed plate. Further, the feed mechanism movably connects the movable fulcrum to a guide groove formed in a longitudinal direction of the swing arm, and moves the movable fulcrum to the guide groove with the swing of the swing arm. It is preferable to convert the swing of the swing arm into a direct movement of the moving body by reciprocating along the axis. Further, a movable fulcrum moving means capable of changing a distance from a fixed fulcrum of the swing arm to a linked position of the movable fulcrum is provided, and the movable fulcrum moving means is driven to swing the linked position of the movable fulcrum. You may make it change along the guide groove formed in the longitudinal direction of the arm. Further, it is preferable that the feed plate vertical movement mechanism vertically moves the feed plate via a toggle link mechanism that opens and closes in conjunction with a vertical movement lever that rotates by pressing against the vertical movement cam. Further, the toggle link mechanism may be configured to open and close the toggle link by operating an opening / closing cylinder when an abnormality occurs. Further, a support plate for supporting the toggle link mechanism is supported by a coil spring. The coil spring moves the feed plate down once, and then moves down the feed plate by lowering the upper die. It is desirable to absorb the pressing force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the D / D (Deflash and Dambar) is used.
The description will be made using an electric press apparatus equipped with a press die for a cut system. 1 is a top view of the drive transmission mechanism, FIG. 2 is a side view of the drive transmission mechanism of FIG.
3 is an explanatory diagram of a feed plate vertical movement mechanism, FIG. 4 is an explanatory diagram showing a configuration of a main part of a feed mechanism, FIG. 5 is an explanatory diagram showing a configuration of a press section of the electric press device, and FIG. FIG. 7 is a front view showing a schematic configuration, and FIG. 7 is a side view of the electric press device in FIG.

(Overall Configuration) First, a schematic configuration of an electric press apparatus will be described with reference to FIGS. 6 and 7. FIG. Reference numeral 1 denotes an electric motor, which drives the press unit 2 by driving the electric motor, and drives the drive transmission mechanism 3 to transmit the drive to a feed mechanism 4 and a feed plate vertical movement mechanism 5 described later. The specific configuration of the press section 2 is shown in FIG. 5, and therefore is omitted in FIGS. 6 and 7.

More specifically, a timing belt 7 is stretched between a motor pulley 1a provided on an output shaft of the electric motor 1 and a first pulley 6a provided on one end of a support shaft 6 of the press section 2. ing. The support shaft 6 is rotatably supported by a bearing 2 a provided on the upper part of the press unit 2. A second pulley 6b provided at the other end of the support shaft 6 and a cam shaft 8 provided at the drive transmission mechanism 3
A timing belt 9 is stretched between a camshaft pulley 8a provided at one end of the belt. Further, a third pulley (not shown) is provided on the support shaft 6, and a timing belt is stretched between the pulley and a pulley provided on a crankshaft (not shown). When the electric motor 1 is started, the support shaft 6 is rotationally driven via a timing belt 7 and the crankshaft is rotationally driven via a timing belt (not shown) to rotate the crank and connect the crank to the crank via a connecting rod. The press ram 10 to be connected is moved up and down. This press ram 10
The press section 2 is connected to the upper die side. Further, the cam shaft 8 is rotationally driven from the support shaft 6 via the timing belt 9, and the feed cam 11 attached to the cam shaft 8 is rotated.
And the cam 12 for vertical movement is rotationally driven to transmit the drive to the feed mechanism 4 and the feed plate vertical movement mechanism 5, respectively. The feed mechanism 4 pitch-feeds the lead frame by reciprocating a feed arm having a pin engageable with a feed hole (pilot hole) formed in a side rail of the lead frame. The feed plate vertical movement mechanism 5 guides the transport of the lead frame in the press section 2 and moves the feed plate up and down in synchronization with the pitch feed operation of the lead frame.

Next, the configuration of each part of the above-described electric press device will be described with reference to FIGS. (Press Unit) First, the configuration of the press unit 2 will be described with reference to FIG. Reference numeral 13 denotes an upper die, and a press casing 14 provided on the upper die 13 is provided with an upper die driving mechanism (not shown) having the above-described crank, connecting rod, and the like. The lower end of the press ram 10 is connected to a punch holder 15. The press ram 10 is driven by the upper die driving mechanism to drive the punch holder 1
5 is moved up and down. The punch 1 is placed in the punch holder 15.
The tip of the punch 16 is guided through a stripper plate 17. The punch holder 15 and the stripper plate 17 are connected by an upper die support post 18, and a coil spring 19 is provided around the upper die support post 18 to urge the stripper plate 17 downward. ing.

Reference numeral 20 denotes a lower die, and a feed plate vertical movement mechanism 5 described below is provided below the press bed 21 of the lower die 20. A die holder 22 is provided on the press bed 21, and a die 23 is held in the die holder 22. Above the die 23, a feed plate 24 for guiding and supporting the lead frame movably in the transport direction in the press section 2 is provided.
Is equipped to be able to move up and down. The feed plate 24 is connected by a lower support post 25 erected on the die holder 22.
Is provided with a coil spring 26, which urges the feed plate 24 upward.

Guide posts 27 are provided above and below between the punch holder 15 and the die holder 22, and the upper die 13 and the lower die 20 are positioned by inserting the stripper plate 17 and the feed plate 24 therethrough. .
The upper and lower ends of the guide post 27 are the punch holder 1
5 and guide bush 15 mounted on die holder 22
The guide bushes 15a and 22a are fixed by aligning the blades of the punch 16 and the die 23 with each other. The stripper plate 17 and the feed plate 24 are guided perpendicular to the guide post 27.

(Drive Transmission Mechanism) Next, the configuration of the drive transmission mechanism 3 will be described with reference to FIG. As described above, the camshaft 8 is driven by the electric motor 1 and transmitted to the camshaft pulley 8a to rotate. The cam shaft 8 is rotatably supported at both ends by a device frame 28 that houses the drive transmission mechanism. A feed cam 11 and a vertically moving cam 12 are coaxially fitted into the cam shaft 8, respectively. The feed cam 11 transmits the drive of the cam shaft 8 to the feed mechanism 4, and the vertical movement cam 12 transmits the drive of the cam shaft 8 to the feed plate vertical movement mechanism 5. The cam curve of the feed cam 11 is drawn so that the feed arm can perform the feed operation at a low speed before the start and before the feed stop of the lead frame, and at a high speed during the feed operation. Further, the cam curve of the up / down movement cam 12 is drawn so that the feed plate 24 can be moved up and down at a low speed before the movement starts and before the movement is stopped, and at a high speed during the movement.

Reference numeral 29 denotes a feed cam contact roller, which is in contact with the working surface of the feed cam 11. The feed cam contact roller 29 is rotatably supported at one end of a swing arm 30. The swing arm 30 is pivotally supported around a first fulcrum 31 as a fixed fulcrum.
0c and constantly urged clockwise (see FIG. 4). Reference numeral 32 denotes a vertical cam contact roller, which is in contact with the operating surface of the vertical cam 12. The vertical movement cam contact roller 32 is rotatably supported by one end 34 a of a vertical movement lever 33. The vertical movement lever 33 is
The vertically movable cam contact roller 32 is urged in a counterclockwise direction by a coil spring (not shown) so as to be pivotable about a support shaft 35, and is constantly pressed against the working surface of the vertically movable cam 12. ing. The vertical movement lever 33
Is connected to one end of a link member 56 of a feed plate vertical mechanism 5 described later at a fulcrum 55. Therefore, when the one end 34a of the vertical movement lever 33 swings about the support shaft 35 by the rotation of the vertical movement cam 12, the other end 3a.
The link material 56 connected to the support 4b at the fulcrum 55 reciprocates right and left (see FIG. 2).

(Feeding Mechanism) Next, the structure of the feeding mechanism 4 will be described. In FIG. 4, a guide groove 30a is formed in the swing arm 30 in the longitudinal direction. Further, a second fulcrum 37 as a movable fulcrum is provided on a second fulcrum plate 36 constituting a part of the moving body, and a guide roller 30b is rotatably supported on the second fulcrum 37 at the second fulcrum 37. ing. The guide roller 30b is connected to the swing arm 3
The pivot arm 30 and the second fulcrum plate 36 are fitted in the zero guide groove 30a. A slide member 38 is provided on the second fulcrum plate 36, and the slide member 38 is fitted on a slide rail 40 provided on the second fulcrum upper and lower plates 39.

The second fulcrum plate 36 is connected to the swing arm 3
0 swings, the guide roller 30 moves in the guide groove 30a.
b moves while rolling, and the slide member 38 reciprocates along the slide rail 40 so that the swing arm 3
The swing of 0 is converted to the linear movement of the second fulcrum plate 36.

As shown in FIG. 1, a first vertical slide guide 41 is provided on a part of the second fulcrum plate 36. The first vertical slide guide 41 is fitted into a first vertical slide rail 43 provided on a feed slide member 42 that constitutes a part of the moving body.
The feed slide member 42 is moved to a first position via a first feed slide guide 44 (see FIG. 2) provided on the back side.
The slide rail 45 for feeding is fitted. The feed slide member 42 is reciprocally movable along the first feed slide rail 45 integrally with the second fulcrum plate 36, and is usually pulled by a coil spring 46 to one side of the device frame 28 (see FIG. 1) is waiting at the home position.

A feed arm mounting member 47 is integrally attached to the feed slide member 42. The feed arm mounting member 47 is fitted into a second feed slide rail 50 provided on the support plate 49 via a second feed slide guide 48 (see FIG. 2) provided on the back side. The feed arm attachment member 47 is reciprocally movable along the second feed slide rail 50 integrally with the feed slide member 42.

In FIG. 1, the feed arm mounting member 47 is provided with a feed arm mounting guide 51. The feed arm mounting guide 51 is mounted to be openable and closable by a feed arm mounting cylinder 52.
The attachment and detachment of the feed arm 80 (see FIG. 2) can be performed easily and reliably. The guide block 5 is provided on the support plate 49.
3 is provided, and by guiding a die such as the die holder 22 of the press unit 2, mounting accuracy can be improved.

Therefore, when the swing arm 30 is swung,
As shown in FIG. 4, the second fulcrum plate 36 is
9 and at the same time, as shown in FIG. 1, the feed slide member 42 connected to the second fulcrum plate 36 is pushed against the urging force of the coil spring 46 to form the first feed slide rail. It is reciprocated along 45. At this time, the feed arm attachment member 47 connected to the feed slide member 42 is also connected to the second feed slide rail 5.
0, the pin 80a of the feed arm 80 attached to the feed arm attachment member 47 (see FIG. 2).
Performs pitch feed while engaging with the feed holes of the lead frame.

In FIG. 4, reference numeral 54 denotes a fulcrum moving motor as a movable fulcrum moving means, which can change the distance from the first fulcrum 31 of the swing arm 30 to the second fulcrum 37. Specifically, a ball screw 54b is vertically attached to the output shaft of the fulcrum moving motor 54 via a coupling 54a. This ball screw 54b
The nut 5 attached to the second fulcrum upper and lower plates 39
When the ball screw 56 is rotated, the second fulcrum upper / lower plate 39 can be moved up and down via the nut 54c. A second vertical slide guide 39a is provided on a part of the second fulcrum upper and lower plate 39, and a second vertical slide guide 39a is formed on the apparatus frame 28 in the vertical direction.
It is fitted on the vertical slide rail 28a. Therefore, when the fulcrum moving motor 54 is driven to rotate in a predetermined direction, the second fulcrum upper and lower plates 39 move up and down along the second up and down slide rails 28a.
9 is connected to the second fulcrum plate 3 via a slide member 38.
6 moves vertically along the first vertical slide rail 43 (see FIG. 1). At this time, the guide roller 30b moves in the longitudinal direction of the swing arm 30 along the guide groove 30a. For example, if the distance between the second fulcrum 37 and the first fulcrum 31 becomes shorter, the amplitude of the swing arm 30 becomes smaller, and the range of the reciprocation of the second fulcrum plate 36 in proportion to the change in the amplitude. And the moving range of the feed slide member 42 integrally connected to the second fulcrum plate 36 and reciprocating and the feed arm mounting member 47 connected thereto are narrowed, and the feed stroke of the feed arm 80 is reduced. Become. Similarly, if the distance between the second fulcrum 37 and the first fulcrum 31 increases, the amplitude of the swing arm 30 increases, and the range of the reciprocation of the second fulcrum plate 36 increases in proportion to the change in the amplitude. As a result, the feed stroke of the feed arm 80 increases.

Accordingly, the fulcrum moving motor 54 is driven to move the guide roller 30b provided at the second fulcrum 37 along the guide groove 30a of the swing arm 30, so that the first fulcrum 31 and the Since the swing range of the swing arm 30 can be changed by changing the distance between the two fulcrums 37, the feed stroke of the feed arm 80 can be changed linearly. In this embodiment, by driving the fulcrum moving motor 54, the feed stroke of the feed arm 80 can be freely changed within a range of about 8 mm to 55 mm. In particular, since the swing of the swing arm 30 is converted into the linear motion of the second fulcrum plate 36 which is directly connected to the reciprocating motion of the feed arm 80 without interposing a plurality of links, the feed stroke amount of the feed arm 80 is changed. Is easy to calculate, the feed stroke adjustment work can be performed very easily even if the type of lead frame changes, and the operability and workability are extremely good. Further, since the number of linked parts such as the swinging arm members is small, maintenance is easy and the manufacturing cost can be reduced.

(Feed Plate Vertical Movement Mechanism) Next, the configuration of the feed plate vertical movement mechanism 5 will be described with reference to FIGS. One end 34 of the vertical movement lever 33
The vertical movement cam contact roller 32 provided in the position (a) is in pressure contact with the vertical movement cam 12, and when the vertical movement lever 33 is swung about the support shaft 35 by the vertical movement cam 12, the other end 34b. A link member 56, one end of which is connected at a fulcrum 55 provided at the position, reciprocates right and left.

The other end of the link member 56 is connected to one end of a link member 58 connected at a fulcrum 57. The other end of the link member 58 is connected to a cylinder rod 60 of an opening / closing cylinder 59. The cylinder rod 60 may be in an extended state or a contracted state, but is in a contracted state in the present embodiment. The opening / closing cylinder 59 includes:
It is attached to the cylinder support member 59a at two locations on the left and right in the longitudinal direction, respectively (see FIG. 6). The cylinder support member 59a is movably supported in the left-right direction in FIG. 2 by a cylinder guide 63 mounted horizontally on a cylinder guide mounting member 62 suspended from the base plate 61. The opening / closing cylinder 59 simply functions as a link member when the feed plate 24 is moved up and down. The above-described support plate 49 and press bed 21 are provided on the base plate 61 (see FIG. 7).

A link member 65 provided at one end of a link housing 66 at a fulcrum 64 is connected to the cylinder housing of the opening / closing cylinder 59.
The link material 67 provided at the other end of the
It is connected to an open / close fulcrum 79 provided at one end of 69. The other ends of the toggle links 68 and 69 are rotatably connected to an upper joint plate 70 and a lower joint plate 71, respectively. The lower joint plate 71 is a support plate that supports a toggle mechanism,
When the toggle links 68 and 69 open and close, the feed plate 24 moves up and down based on the lower joint plate 71. A lower end of a feed plate supporting member 72 is connected to the upper joint plate 70, and an engaging member 74 is connected to an upper end of the upper joint plate 70 through a bearing member 73 fitted in the base plate 61. The feed plate 24 is engaged with and supported by the engagement recess 74 a of the engagement member 74.

An abutment member 75 is provided upright on the upper surface of the lower joint plate 71. When the toggle links 68 and 69 are bent and the feed plate 24 moves downward, the upper joint plate 70 abuts and is supported. And the range of downward movement is specified. A spring receiving plate 76 is provided below the lower joint plate 71. The spring receiving plate 76 is provided on the base plate 61.
Is attached to a spring receiving plate attaching member 76a vertically provided at the bottom. A guide post 77 is vertically provided on the lower surface of the lower joint plate 71, and a lower end thereof is fitted so that a spring receiving plate 76 can be inserted therethrough. A coil spring 78 is fitted around the guide post 77, and constantly urges the lower joint plate 71 upward. The toggle link mechanism configured as described above is provided on both sides of the other end 34b of the vertical movement lever 33 as shown in FIG.
Are supported on the left and right sides by engagement members 74 so as to be vertically movable.

Therefore, when the up-down movement cam 12 shown in FIG. 2 rotates, the up-down movement lever 33 swings about the support shaft 35, and the toggle link is provided via a plurality of link members such as the opening / closing cylinder 59 shown in FIG. The open / close fulcrum 79 of 68, 69 is reciprocated between the P position and the Q position. Thereby, the toggle links 68 and 69 are opened and closed, and the feed plate 24 engaging with the engaging member 74 connected to the upper end of the feed plate supporting member 72 connected to the upper joint plate 70 is moved up and down. In addition, the above-mentioned toggle link 68,6
9 indicates that when the cylinder rod 60 of the opening / closing cylinder 59 is in the extended state, the opening / closing fulcrum 79 is positioned between the Q position in FIG.
Reciprocate between positions.

When a lead frame setting error occurs, that is, when a not-shown error detection pin detects a lead frame setting failure, the operation of the apparatus is stopped, and the lead frame is removed and installed in a mold. It is necessary to re-engage the pilot pin. In this case, if the feed plate 24 has moved up, it is necessary to move it down. If the feed plate 24 has moved downward, it must be moved upward to support the lead frame. At this time, the opening / closing cylinder 59 of the toggle link mechanism is operated by a manual operation to extend or contract the cylinder rod 60, whereby the toggle link 6 is extended.
8, 69 can be opened and closed to remove the lead frame to repair the misalignment. In this way, by operating the opening / closing cylinder 59, the toggle link 6
Since the lead frame can be repaired by opening and closing 8, 69, workability and operability are good.

Further, when the upper die 13 moves down in the press section 2 to lower the feed plate 24 against the urging force of the coil springs 26 provided on both sides in the width direction, warpage or the like due to long-term use. Deformation may occur (see FIG. 5). Therefore, when the upper die 13 moves down,
The stripper plate 17 is moved down until it once comes into contact with the feed plate 24, and when the feed plate 24 is further pushed down, the lower joint plate 71
Moves downward against the urging force of the coil spring 78, so that the pressing force of the upper die 13 is absorbed by the coil spring 78. At this time, the guide post 77
Is projected downward through the spring receiving plate 76 as the coil spring 78 is compressed. Thereby, the deformation of the feed plate 24 can be prevented.

(Lead Frame Feeding Operation) Next, the lead frame feeding operation in the electric press device configured as described above will be described together with the press operation. still,
In the present embodiment, by driving the electric motor 1,
Since the vertical movement of the upper die 13, the reciprocating movement of the feed arm 80, and the vertical movement of the feed plate 24 are performed in synchronization with each other, the feeding operation during the pressing operation for one stroke on the lead frame will be described. I do.

First, the feed plate 24 of the press section 2
The feed plate 24 is moved upward with respect to the lead frame set on the
0a is engaged with the feed hole of the lead frame from above.
Then, when the feed arm 80 is moved forward (in the direction of the arrow E in FIG. 1) to feed the lead frame by one pitch, the upper die 13 moves down and the stripper plate 17 moves the feed plate 2.
If the feed arm 24 is disengaged from the lead frame by lowering the feed plate 24 before pushing down the feed arm 4, the feed arm 80 is moved to an initial position (direction of arrow F in FIG. 1) not corresponding to the die 23. Move back (see FIG. 5).

The upper die 13 is further moved downward so that the stripper plate 17 contacts the feed plate 24 and pushes it down, and the punch 16 enters the die 23 to perform press working (see FIG. 5). At this time, as described above, the feed plate 24 is pressed further downward by the urging force of the coil spring 19 even when the feed plate 24 once reaches the downward movement reach range, but the lower joint plate 71 connected to the toggle link mechanism is The feed plate 2 is compressed by being compressed against the urging force of the spring 79.
4 is absorbed (see FIG. 3).

When the pressing is completed, the upper die 1 moves upward, and when the feed plate 24 moves upward, the feed arm 80 moves upward.
Is engaged with the feed hole of the lead frame,
The feed arm 80 is moved forward again to feed the lead frame by one pitch, and the pressing is repeated in the same manner. In the above-described electric press device, when the index time required for one stroke of press working on the lead frame was measured, the index time was increased from about 70 spm in the past to about 200 spm, thereby realizing high speed.

According to the above configuration, the electric motor 1 is driven to move the upper die 13 up and down to perform the pressing operation, and the feed mechanism 4 and the foot plate up and down movement which are organically connected via the drive transmission mechanism 3. Since the lead frame feeding operation is performed by synchronizing the mechanism 5, the index time required for lead frame feeding and press working can be significantly reduced, and work efficiency can be increased. In particular, a feed cam 11 and a vertical movement cam 12 are provided on the same cam shaft 8 in the drive transmission mechanism 3 for transmitting the drive to the feed mechanism 4 and the feed plate vertical movement mechanism 5, respectively. By drawing the lead frame at a low speed at the start and before the stop, and at a high speed during the feed operation, the lead frame can be fed without being damaged, and the feed pins 80a of the feed arm 80 are less damaged. be able to.

Further, by driving the fulcrum moving motor 54,
The guide roller 30b provided at the second fulcrum 37 is moved along the guide groove 30a of the oscillating arm 30, and the distance between the first fulcrum 31 and the second fulcrum 37 is changed, whereby the swing arm Since the swing range of the feed arm 30 can be changed, the feed stroke of the feed arm 80 can be changed linearly. In particular, the movable body such as the second fulcrum plate 36, the feed slide member 42, and the feed arm mounting member 47 that directly connects the swing of the swing arm 30 to the reciprocation of the feed arm 80 without interposing a plurality of links. The conversion to the linear motion facilitates the calculation of the feed stroke amount of the feed arm 80, makes it possible to perform the feed stroke adjustment operation very easily even when the type of lead frame changes, and has extremely good operability and workability. Further, since the number of components linked to the swing arm 30 is small, maintenance is easy and the manufacturing cost can be reduced.

Further, when a mistake in setting of the lead frame occurs, the opening / closing cylinder 59 is manually operated to open / close the toggle links 68 and 69 to move the feed plate 24 up and down. Can be easily repaired to remove misalignment, and workability and operability are good.

The present invention is not limited to the above embodiment, and the electric press device may have not only a single punch but also a plurality of dies, and the press die is a D / D die. T / F (Trimming and
(Forming) mold. Further, the press device is not limited to the punching process, and can be applied to a press device capable of performing other press processes such as a bending process, and many more modifications can be made without departing from the spirit of the invention. Of course.

[0042]

According to the present invention, as described above, the press operation is performed by moving the upper die up and down by the electric motor, and the feed operation of the lead frame and the vertical movement of the feed plate are synchronized through the drive transmission mechanism. Therefore, the index time required for lead frame feeding and press working can be significantly reduced, and work efficiency can be improved. In particular, by providing a feed cam and a vertical movement cam on the cam shaft as a drive transmission mechanism for transmitting a drive to the feed mechanism and the feed plate vertical movement mechanism, respectively,
By drawing these cam curves at a low speed before starting and stopping the lead frame, and at a high speed during the feed operation, it is possible to feed the lead frame without damage.
Moreover, breakage of the feed pin of the feed arm can be reduced.

Further, by driving the movable fulcrum moving means to change the distance from the swing center of the swing arm to the connecting position of the moving body in the longitudinal direction of the swing arm, the feed stroke of the feed arm is changed. Can be changed linearly. In particular, since the swing of the swing arm is converted into the linear motion of the moving body directly connected to the reciprocating motion of the feed arm without interposing a plurality of links, it is easy to calculate the feed stroke amount of the feed arm. In addition, even if the type of the lead frame is changed, the work of adjusting the feed stroke can be performed very easily, and the operability and workability are extremely good. Further, since the number of components linked to the swing arm is small, maintenance is easy and the manufacturing cost can be reduced.

Further, in the event of a mistake in setting the lead frame, the feed plate can be moved up and down by manually opening and closing the toggle link mechanism by operating the opening / closing cylinder. The gap can be easily repaired, and workability and operability are good.

[Brief description of the drawings]

FIG. 1 is a top view of a drive transmission mechanism.

FIG. 2 is a side view of the drive transmission mechanism in FIG.

FIG. 3 is an explanatory diagram of a feed plate vertical movement mechanism.

FIG. 4 is an explanatory diagram showing a configuration of a main part of a feed mechanism.

FIG. 5 is an explanatory diagram showing a configuration of a press unit of the electric press device.

FIG. 6 is a front view showing a schematic configuration of the electric press device.

FIG. 7 is a side view of the electric press device of FIG. 6 in the direction of arrow B.

FIG. 8 is a plan view of a conventional press device.

FIG. 9 is an explanatory view of a feed arm in a conventional press device.

FIG. 10 is an explanatory diagram showing a configuration of a conventional feed plate vertical movement mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 1a Motor pulley 2 Press part 2a Bearing part 3 Drive transmission mechanism 4 Feed mechanism 5 Feed plate vertical movement mechanism 6 Support shaft 6a First pulley 6b Second pulley 7,9 Timing belt 8 Cam shaft 8a Cam shaft pulley 10 Press ram 11 Feeding cam 12 Vertical movement cam 13 Upper die 14 Press casing 15 Punch holder 15a, 22a Guide bush 16 Punch 17 Stripper plate 18 Upper die support post 19, 26, 46, 78 Coil spring 20 Lower die 21 Press bed 22 Die holder 23 Die 24 Feed Plate 25 Lower Die Support Post 27, 77 Guide Post 28 Device Frame 28a Second Up / Down Slide Rail 29 Feeding Cam Contact Roller 30 Swing Arm 30a Guide Groove 30b Guide Roller 30c Spring retaining portion 31 First fulcrum 32 Cam contact roller for vertical movement 33 Vertical movement lever 35 Support shaft 36 Second fulcrum plate 37 Second fulcrum 38 Slide member 39 Second fulcrum upper and lower plate 39a Second vertical slide guide 40 Slide Rail 41 First vertical slide guide 42 Feed slide member 43 First vertical slide rail 44 First feed slide guide 45 First feed slide rail 47 Feed arm mounting member 48 Second feed slide guide 49 Support plate 50 Second feed slide rail 51 Feed arm mounting guide 52 Feed arm mounting cylinder 53 Guide block 54 Support point moving motor 54a Coupling 54b Ball screw 54c Nut 55, 57, 64 Support points 56, 58, 65, 67 Link material 59 Opening / closing cylinder 60 Siri Darrod 61 Base plate 62 Cylinder guide attachment member 63 Cylinder guide 66 Link housing 68, 69 Toggle link 70 Upper joint plate 71 Lower joint plate 72 Feed plate support member 73 Bearing member 74 Engagement member 74a Engagement concave portion 75 Abutment member 76 Spring Receiving plate 76a Spring receiving plate mounting member 79 Opening / closing fulcrum 80 Feed arm

Claims (7)

[Claims] 1. An electric press apparatus for performing press working by feeding a lead frame having a perforated hole to a press section equipped with a press die at a pitch, wherein a pin engageable with the perforated hole of the lead frame is provided. A feed arm having: a feed mechanism that reciprocates the feed arm in the direction of transport of the lead frame; and a press unit that guides and supports the lead frame movably in the direction of transport and is provided movably up and down. A feed plate, a feed plate vertical movement mechanism for vertically moving the feed plate, and a drive unit for driving the press unit, and a rotation of a feed cam and a vertical movement cam provided on a cam shaft. A drive transmission mechanism for transmitting drive to the plate up-and-down movement mechanism, and an electric motor for operating the drive transmission mechanism. A moving body is connected via a movable fulcrum to a swing arm that is pressed against the feed cam and swings around a fixed fulcrum, and swings the swing arm. The feed is converted into a direct motion of the moving body that is directly connected to the reciprocating motion of the feed arm, and the distance from the fixed fulcrum of the swing arm to the movable fulcrum is changed in the longitudinal direction of the swing arm. An electric press device wherein the feed stroke of the arm can be changed linearly. 2. The drive transmission mechanism reciprocates the press die when the electric motor is started, and drives the feed cam and the up / down movement cam provided on the same cam shaft to rotate the drive die. The electric press device according to claim 1, wherein the lead frame is pitch-fed by alternately performing a forward movement or a backward movement of a feed arm and an upward movement or a downward movement of the feed plate. 3. The moving mechanism movably connects the movable fulcrum to a guide groove formed in a longitudinal direction of the swing arm, and adjusts the position of the movable fulcrum with the swing of the swing arm. The electric press device according to claim 1 or 2, wherein the reciprocating movement along the guide groove converts the swing of the swing arm into a direct movement of the moving body. 4. A movable fulcrum moving means capable of changing a distance from a fixed fulcrum of the swing arm to a linked position of the movable fulcrum, and driving the movable fulcrum moving means to change a linked position of the movable fulcrum. 4. The electric press device according to claim 3, wherein the change is performed along a guide groove formed in a longitudinal direction of the swing arm. 5. The feed plate vertical movement mechanism moves the feed plate up and down via a toggle link mechanism that opens and closes in conjunction with a vertical movement lever that rotates by pressing against the vertical movement cam. Claims 1, 2,
The electric press device according to claim 3 or 4. 6. The electric press device according to claim 5, wherein the toggle link mechanism is configured to open and close the toggle link by operating an opening / closing cylinder when an abnormality occurs. 7. A support plate for supporting the toggle link mechanism is supported by a coil spring. The coil spring once lowers the feed plate and further lowers the feed plate by lowering the upper die. The electric press device according to claim 6, wherein the pressing force at the time of pressing down is absorbed.