JPH06219530A - Band plate carrying device - Google Patents

Abstract

PURPOSE:To provide a band plate carrying device which executes the specified operation with high accuracy and at high speed on the band plate while the stripped band plate being continuously carried one after another. CONSTITUTION:A band plate carrying device is provided with a pair of first and second grip parts 7a, 7b to hold the respective rear end parts of two stripped band plates 11a, 11b and a pair of first and second holding parts 8a, 8b to hold the first and the second grip parts 7a, 7b in a vertically movable manner. In addition, a pair of servo driven type first and second ball screws 9a, 9b which are arranged in parallel where the first and the second holding parts 8a, 8b are independently screwed, and the respective grip parts 7a, 7b are reciprocated in the same perpendicular plane, and two band plates 11a, 11b are simultaneously carried in the constant direction by keeping the fixed space, and a control part 10 the respective servo driving of the first and the second ball screws 9a, 9b so as to detect the respective positions of the first and the second grip parts 7a, 7b and hold the minimum constant space between the two grip parts are provided, and the respective grip parts are controlled with high accuracy and at high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip conveying device, and more particularly to a strip conveying device for carrying out laser marking, bonding, etc. on an element while conveying a lead frame having a semiconductor element mounted thereon.

[0002]

2. Description of the Related Art For example, in manufacturing a semiconductor device, when laser marking or bonding is performed on a semiconductor element mounted on a lead frame, a predetermined work is carried out while the lead frame is being carried. The marking operation will be described below with reference to FIG. In the figure, (1) is a lead frame on which a semiconductor element is mounted, (2) is a grip part that holds the rear end of the lead frame (1) and can be opened and closed and opened and closed.
(3) is a timing belt for raising and holding the grip portion (2), and (4) and (4) are pulleys around which the timing belt (3) is wound and whose shaft is connected to a motor (not shown). , (5) are laser markers arranged at predetermined positions on the timing belt (3).

In the above structure, the rear end portion of one lead frame (1) is gripped by the grip portion (2), conveyed to the laser marker side by the timing belt (4), and mounted directly below the laser marker (5). Each time an element arrives, laser marking is sequentially performed on the element. When all the markings of one lead frame (1) are completed, the lead frame (1) is removed, the pulley (4) is rotated in the reverse direction to return the grip part (2) to the initial position, and thereafter, the same is performed. Repeat the transportation and marking work.

[0004]

The problem to be solved is to reverse the timing belt (3) every time a predetermined work such as laser marking is completed to temporarily return the grip portion (2) to the initial position. Therefore, during the return time, the work is temporarily interrupted, a loss time is generated, and productivity is lowered. Also, the timing belt (4) (4)
Since the paper is conveyed in the same manner, there is a problem that the conveyance speed varies and the position accuracy decreases, the marking position varies, and the marking character arrangement is irregularly disturbed.

[0005]

According to the present invention, there are provided a pair of first and second grip portions for holding respective rear end portions of two strip-shaped strips, and the first and second grip portions. A pair of first and second holding portions that are vertically movably held, and a pair of parallel arrangements,
Servo drive type in which the first and second holding parts are independently screwed to reciprocally drive each grip part in the same vertical plane and two strips are simultaneously conveyed in a fixed direction with a fixed interval. First,
Characterized by having a second ball screw,

Further, there is provided a control section for detecting each position of the first and second grip sections and controlling each servo drive of the first and second ball screws so as to maintain a minimum constant distance therebetween. It is characterized in that each grip section is controlled at high speed, and that the control section has at least work processing data relating to the strip length and the number of strip mounting elements.

[0007]

According to the above-mentioned technical means, the rear end portions of the two strips of the lead frame or the like are held by the first and second grip portions, respectively, and the grip portions are oriented in the same vertical plane. And continuously conveyed with the minimum constant interval maintained. Then, each time the preceding grip portion reaches the work position, the work is performed on the strip plate, and when the work is completed, the work is continuously performed on the rear grip portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a strip plate conveying device according to the present invention will be described below with reference to FIGS. First, FIGS. 1 and 2 show a schematic plan view and a side view of a belt plate transporting device (6) according to the present invention. In the figure, (7a) and (7b) are first and second grip portions, (8a) and (8b) are first and second holding portions, and (9).
a) (9b) is the first and second ball screws, and (10) is the controller. The first and second grip portions (7a) (7b)
Is openable and closable, and holds the rear end portions of the strip-shaped strips (11a) (11b) such as lead frames as in the conventional case. First,
The second holding portions (8a) and (8b) hold the first and second grip portions (7a) and (7b) vertically movable. The first and second ball screws (9a) and (9b) are connected to the servomotors (12a) and (12b) in a parallel arrangement, and the first and second holding portions (8a) and (8b) are independent of each other. Screwed on. And each grip part (7a) (7
b) is reciprocally driven in the same vertical plane (P), and the two strips (11a) and (11b) are simultaneously conveyed in a fixed direction while maintaining a constant interval. The control unit (10) is equipped with a computer and has work processing data such as a strip length, the number of mounted elements on the strip, and the number of prints in the case of marking, and rotation of the servo motors (12a) (12b). Each position and speed of each grip part (7a) (7b) is detected by calculation from the number and speed. Therefore, for example, the position detection data of the first grip portion (7a) is sent to the second grip portion (7b), and each grip portion (7a) is kept so that a constant constant interval is maintained between them.
(7b) is speed controlled or numerically controlled.

The operation of the present invention based on the above configuration will be described below. First, the rear end portion of the strip plate (11a) is gripped by the first grip portion (7a), and the rear end portion of the strip plate (11b) is held by the second grip portion (7b) at a certain distance behind the grip portion. , And as shown in FIG. 2, each strip (11a) (1
The height of the second grip portion (7b) is set to be slightly lower than that of the first grip portion (7a) so that the first grip portion (7b) does not collide with the first grip portion (7a). Therefore, the servo motor (12a) servo-rotates the first ball screw (9a) to move the first grip portion (7).
a) is conveyed to a work position side (left direction in the drawing) for laser marking or the like with high precision at a predetermined speed. At the same time, the second ball screw (9b) is servo-rotated to keep the second grip portion (7b) from the first grip portion (7a) rearward at a minimum constant interval with high precision, and at the work position side (leftward in the drawing). Simultaneously convey at a predetermined speed.

Therefore, each time the strip plate (11a) reaches the work position, a predetermined work such as laser marking is carried out on the mounted elements and the like thereon. And the strip (11
When the work for a) is completed, a predetermined work such as laser marking is continuously performed on the strip plate (11b) held by the second grip portion (7b). At the same time, the servo motor (12a) is reversely rotated to immediately return the first grip portion (7a) to the initial position, and the same operation is repeated. At this time,
The control unit (10) controls the servomotors (12a) (12
Based on the rotation speed and speed of b), each grip part (7a) (7b)
The position and speed of each of the grips (7a) (7
When work is interrupted when b) returns to the initial position, the servo motors (12a) and (12b) are reversely rotated at the highest speed to minimize work loss time. In addition, similarly, the positions of the first and second grip portions (7a) and (7b) are detected from the rotation speeds and speeds of the servo motors (12a) and (12b) to control the grip portions (7a) and (7b). ), Speed control or numerical control is performed, and the second grip portion (7b) is driven so as to always keep the minimum constant interval with respect to the preceding first grip portion (7a). As a result, high precision and high speed work were realized, and the work loss time could be greatly reduced. According to the measurement, the work time could be shortened from about second to about second.

Next, referring to FIGS. 3 and 4, a general structure of the strip conveying apparatus according to the present invention will be described below. (7a)
(7b) is the first and second grip portions, (8a) and (8b) are the first and second holding portions, and (9a) and (9b) are the first and second ball screws. The first and second grip portions (7a) (7
b) is a strip guide (13a) (1) as shown in FIG.
3b) in the gap corresponding to the strip width (W),
Slide part (14a) of the second holding part (8a) (8b)
(14b) is vertically movably held, and as shown in FIG. 4, each pair of vertically movable gripping pieces (T
a) (Tb). Then, the gripping pieces (T) are attached to both ends of the rod (15) which rotates the seesaw around the fulcrum (B).
a) While connecting the lower ends of (Tb), the rod (1
5) One end is urged downward by a tension spring (R).

Further, the slide portions (14a) (14b) are held by an external upper and lower two-stage cylinder (16), and the cylinder (1
When 2 steps of 6) are projected or retracted at the same time, the slide parts (14a) (14b) and the gripping pieces (Ta) (Tb) are raised or lowered with the opening, and only the upper stage of the cylinder (16) is withdrawn. Then, the gripping pieces (Ta) (Tb) are closed. Therefore, after the gripping pieces (Ta) (Tb) are lifted while they are open, only the upper stage of the cylinder (16) is retracted, and the gripping pieces (T
a) Close (Tb) and grip the end of the strip. Also, the first
The first and second holding portions (8a) and (8b) are screwed into the second ball screws (9a) and (9b), and the strip plate is guided (13a).
While being guided by (13b), it is conveyed in a fixed direction by servo rotation.

[0013]

According to the present invention, the strip-shaped strips are gripped by the two grip portions one by one and continuously conveyed in a state where the minimum constant interval is maintained, and the strip-shaped strips are placed on the strips in the working position. Since the predetermined work is performed, high-precision and high-speed work can be realized, the work time is greatly shortened, and the productivity is greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of a strip board conveying device according to the present invention.

FIG. 2 is a schematic side view showing an embodiment of a strip board conveying device according to the present invention.

FIG. 3 is a front view showing a general structure of a strip board conveying device according to the present invention.

FIG. 4 is a partial side view showing a general configuration of a strip plate conveying device according to the present invention.

FIG. 5 is a schematic side view showing an example of a conventional strip board conveying device.

[Explanation of symbols]

 7a 1st grip part 7b 2nd grip part 8a 1st holding part 8b 2nd holding part 9a 1st ball screw 9b 2nd ball screw 10 control part 11a strip 11b strip

Claims (3)

[Claims] 1. A pair of first and second grip portions for holding a rear end portion of the strip-shaped strip, and a pair of first and second grip portions for holding the first and second grip portions in a vertically movable manner. Two holding parts are arranged in parallel with each other, and the first and second holding parts are independently screwed to reciprocally drive each grip part within the same vertical plane to hold the strip strips at regular intervals. A belt plate transporting device comprising: servo driven first and second ball screws for transporting in a fixed direction in a state. 2. The first and second grip portions are detected so as to detect the respective positions of the first and second grip portions and always maintain a minimum constant distance therebetween.
Equipped with a control unit that controls each servo drive of the ball screw,
The strip board conveying device according to claim 1, wherein each of the grip portions is controlled at a high speed. 3. The strip conveying apparatus according to claim 2, wherein the control unit has at least work processing data relating to the strip length and the number of strip mounting elements.