Method of placing components on carriers and device for carrying out the method

Abstract: The invention relates to simultaneous placement of components (13) by means of several placement heads (9) on multiple carriers (5), placement heads (9) having a fixed stroke being used and the multiple carriers (5) being moved simultaneously in the x,y plane.

Description: The invention relates to a method of placing components on carriers, in which within a placement period a number of carriers are transported in a transport direction to a placement region, after which several placement cycles are carried out, during which components are picked up from supply positions and are then placed simultaneously on the carriers . A method of the kind to which the present invention relates is known from US-A-4,346,514. In this known method, components are picked up by placement heads and are then placed simultaneously on the carriers. When several components are placed by a placement head on the same carrier, a placement head must perform a movement in the x,y plane. A disadvantage of the method described above is that a separate driving mechanism for each placement head is required for performing these x,y movements. The invention has for its object to provide a method of the kind described above, by which in an economical manner components can be placed with the aid of comparatively simple means on carriers and more particularly on multiple carriers. The term "multiple carrier" is to be understood to mean herein a carrier consisting of a number of identical subcarriers coupled to each other. According to the invention, this object is achieved in that before the first placement period, all placement heads are positioned in a predetermind fixed position above the placement region , and that in the same placement period after a placement cycle the carriers in the placement region are displaced simultaneously according to the same movement pattern in the x-y plane and next placement cycle is carried out. In contrast with the method according to US-A-4,346,514, when components are placed on multiple carriers by means of the method according to the invention, the placement heads are once positioned and fixed and the multiple carriers are displaced simultaneously in the x,y plane so that the components can be placed simultaneously on different subcarriers. Preferably, each placement head places components of the same type at a predetermined area in the placement region. In an embodiment of the method according to the invention, after a placement period the carriers are transported stepwise in the transport direction, at least one carrier being removed from the placement region and at least one fresh carrier being fed into the placement region. After a multiple carrier has passed through a number of placement periods and the required components have been placed on all subcarriers, this multiple carrier is removed stepwise in the transport direction and a fresh multiple carrier is fed into the placement region. In general, after each placement period only one multiple carrier will be removed in the transport direction. However, situations are conceivable, in which several multiple carriers are removed after one placement period. The invention also relates to a device for carrying out the method. The device comprises a transport device for carriers, a number of placement heads and feeding mechanisms for components and is characterized by placement heads having a fixed stroke and by an elongate table displaceable in the x,y direction. When using placement heads having a fixed stroke, the construction of the device becomes simple. The device becomes even simpler when using placement heads having an identical fixed stroke. The placement heads are once positioned and then place components at a predetermined area in the placement region. Due to the elongate table, several multiple carriers can be displaced in a simple manner simultaneously and according to the same desired movement pattern in the x,y plane. The table may be of the kind already proposed in a prior Patent Application of the Applicant, now European Patent No. 0 388 006. The invention will be described more fully with reference to the drawing. In the drawing: Figure 1 shows diagrammatically an embodiment of a device according to the invention; Figure 2 shows carriers in different cycles of a placement period. Figure 1 shows diagrammatically an embodiment of a device 1 according to the invention mainly consisting of a transport device 3 for supplying and removing carriers 5 in the direction of the arrows 7, a number of placement heads 9, feeding mechanisms 11 for feeding components 13 and an elongate table 17 displaceable according to the arrows 15 in the x,y direction. The carriers 5 are multiple and consist of a number of identical subcarriers S coupled to each other. In the embodiment shown, four sextuple carriers 5 are positioned on the table 17. Each placement head 9 places a component 13 on each subcarrier S of the sextuple carriers 5. The transport device 3 for the carriers 5 supplies on one side empty carriers and removes full carriers on the other side. Figure 2 shows diagrammatically carriers 5 in different placement cycles of a placement period. The parts corresponding to Figure 1 are designated by the same reference numerals. The various situations and placement cycles are designated by B, C1, C2, C3, C4 and E. In the situation B, three quadruple carriers 5b, 5c and 5d are shown in a placement region 19, which is covered by the table 17. On one side of the placement region 19, empty carriers are supplied; on the other side full carriers are removed in the transport direction 7. Reference numeral 5e designates an empty carrier still to be supplied and reference numeral 5a designates a removed full carrier. Each of the multiple carriers 5a to 5e comprises identical subcarriers S1, S2, S3 and S4. Components must be placed on the subcarriers 5b to 5e in the marked positions 21. Components are placed on the four subcarriers S1 to S4 of the carriers 5b, 5c and 5d during the placement cycles C1 to C4. In the placement cycle C1, components are placed on the subcarriers S1; in the cycle C2, components are placed on the subcarriers S2; in the cycle C3 components are placed on the subcarriers S3 and in the cycle C4 components are placed on the subcarriers S4. Between the various cycles, the quadruple carriers 5b, 5c and 5d are moved simultaneously according to the arrows 15 in the x,y plane. The placement heads 9 remain fixed in their adjusted positions. In the situation E, the result after placement of components in the cycles C1 to C4 is shown. All components 13 have now been placed on the quadruple carrier 5b and this carrier 5b can be removed in the transport direction 7. A fresh carrier 5e is fed into the placement region; the multiple carriers 5c and 5d are passed on and the situation B is obtained again. A new placement period, in which components 13 are placed on the subcarriers of multiple carriers, can be started. When the components 13 have to be placed in a different configuration on the carriers, the placement heads 9 are fixed in a different position before a new placement period is started. During a placement period, the placement heads 9 are stationary.

Claims: A method of placing components on carriers (5), in which within a placement period a number of carriers (5) are transported in a transport direction (7) to a placement region (19), after which several placement cycles (C1,...C4) are carried out, during which placement heads (9) pick up components (13) from supply positions and then place them simultaneously on the carriers (5), characterized in that, before the first placement period all placement heads (9) are positioned at a predetermind fixed position above the placement region (19), and that in the same placement period after a placement cycle (C1,...C4) the carriers (5) in the placement region (19) are displaced simultaneously according to the same movement pattern in the x-y plane and next placement cycle is carried out. A method as claimed in claim 1, characterized in that after a placement period the carriers (5) are transported stepwise in the transport direction (7), at least one carrier being removed from the placement region (19) and at least one fresh carrier being fed into the placement region. A device for carrying out the method as claimed in claim 1 or 2, comprising a transport device (3), a number of placement heads (9) and driving mechanisms for components, characterized by placement heads (9) having a fixed stroke (pick and place) and by an elogate table (17) displaceable in the x-y direction.

Inventors: SMOLDERS JOZEF GERARDUS HENDRI, SYGALL PETER IVAN, SMOLDERS JOZEF GERARDUS HENDRIK MARIA, SYGALL, PETER IVAN
Applicants: PHILIPS ELECTRONICS NV, PHILIPS ELECTRONICS N.V.
Application year: 1990
Main classification: H05K13
IPC codes: B23P21, B65B5, H05K13