CN104582462A - with feeder - Google Patents

Abstract

The present invention provides a tape feeder, the tape feeder by transferring pitch and for supporting the holding member and the belt member is supplied to the pickup position of the component mounting apparatus, the tape feeder comprising: a first a sprocket, and is formed at a constant pitch in the belt engagement holes, and transmits the band; first rotation driving means, so that rotation of the first sprocket; second sprocket, disposed upstream of the first sprocket side, and is formed at a constant pitch in the belt engagement holes, and transmits the band; second rotation driving means, the rotation of the second sprocket; a control unit controlling the first and the second rotary driving unit rotating driving unit operation, wherein the continuous second sprocket teeth are omitted, the number of teeth at least equal to the number of the omitted teeth of the second sprocket tape at the tape transport path of the engagement, when the ends of the belt When the member reaches the picking position, the control unit causes the second rotation drive unit is stopped.

Description

with feeder

This application claims Japanese Patent Application No. 2013-213859 filed with the Japan Patent Office on October 11, 2013 and Korean Patent Application No. 10-2013-0167486 filed with the Korean Intellectual Property Office on December 30, 2013 Interest, the disclosures of said two patent applications are hereby incorporated by reference in their entirety.

technical field

One or more embodiments of the present invention relate to tape feeders, and more particularly, to a tape feeder that is conveyed by pitch for supporting and holding The belt of components is supplied to the pick-up position of the component mounting device.

Background technique

In the component mounting apparatus, a method using a tape feeder is known as a method of supplying components to a pick-up position of a nozzle of a component mounting head. According to the method, a belt supporting and holding a component is drawn out from a supply reel at a specified pitch, and the belt is conveyed at a pitch in synchronization with the component mounting timing, thereby supplying the component to the nozzle. Pick up location.

In the prior art, a sprocket and a motor for rotating the sprocket are generally used as a mechanism for conveying such a belt (for example, Japanese Patent Application Publication No. 2000-114777). The belt transmission mechanism pitch-transfers the belt by inserting sprockets into holes formed in the belt at a constant pitch and rotationally driving a motor.

In addition, recently, a tape feeder that further employs a second sprocket ( The sprocket (the first sprocket) that pitches the belt differently for mounting the parts) to aid in the belt delivery on the belt delivery path of the belt feeder or to help peel off the cover tape used to cover the belt.

However, the motor (second motor) for rotationally driving the second sprocket may be stopped when the components are installed. The reason is that it is difficult to control synchronization if the second motor is driven together with the motor (first motor) for rotationally driving the first sprocket. In addition, when two motors are driven simultaneously, power consumption increases.

However, even if the second motor is stopped, the second sprocket is engaged with the belt, and therefore, the second sprocket rotates in conjunction with the rotation of the first sprocket. Therefore, the load for jointly rotating the second sprocket is also applied to the first motor. In other words, since the second sprocket rotates following the rotation of the first sprocket, the belt conveying resistance increases, thus occurring including a decrease in belt conveying accuracy, damage to the holes (transfer holes) of the belt, and increased second sprockets. A motor power consumption problem.

[Prior art literature]

[Patent Document]

Japanese Patent Application Publication No. 2000-114777 (April 21, 2000)

Japanese Patent Application Publication No. 2010-199567 (September 9, 2010)

Contents of the invention

One or more embodiments of the present invention include a belt feeder including a first sprocket that pitches a belt to mount components and a second chain on an upstream side of the first sprocket. wheels and reduce belt transport resistance during component installation.

Additional aspects of the exemplary embodiments will be set forth in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

According to one or more embodiments of the present invention, a tape feeder supplies components to a pick-up position of a component mounting apparatus by pitch-feeding a tape for supporting and holding the components, the tape feeder comprising : a first sprocket that engages with holes formed on a belt at a constant pitch and conveys the belt; a first rotation drive unit that rotates the first sprocket; a second sprocket that is disposed on the first sprocket The upstream side of the belt meshes with the holes formed on the belt at a constant pitch and conveys the belt; the second rotation drive unit rotates the second sprocket; the control unit controls the first rotation drive unit and the second rotation drive unit operation of the drive unit in which the teeth of the second sprocket are continuously omitted, the number of omitted teeth being at least equal to the number of teeth of the second sprocket meshing with the belt at the belt conveyance path, when the end of the belt When the parts at reach the pick-up position, the control unit stops the second rotary drive unit.

The teeth of the second sprocket are consecutively omitted, and the number of omitted teeth is equal to the number of teeth of the second sprocket that are engaged with the belt at the belt transport path.

The control unit sets the initial position of the second sprocket such that the toothless portion of the second sprocket reaches the belt transport path when the component at the end of the belt reaches the pick-up position.

According to one or more embodiments of the present invention, a tape feeder supplies components to a pick-up position of a component mounting apparatus by pitch-feeding a tape for supporting and holding the components, the tape feeder comprising : a first sprocket that engages with holes formed on a belt at a constant pitch and conveys the belt; a first rotation drive unit that rotates the first sprocket; a second sprocket that is disposed on the first sprocket The upstream side of the belt meshes with the holes formed on the belt at a constant pitch and conveys the belt; the second rotation drive unit rotates the second sprocket; the control unit controls the first rotation drive unit and the second rotation drive unit Operation of a drive unit in which an intermediate gear or intermediate gears are provided between a sprocket fixed to the second sprocket and a rotary drive gear fixed to the second rotary drive unit, and a toothless portion is provided at the intermediate gear , so that when the second sprocket rotates, the intermediate gears do not mesh with the sprocket or the rotating drive gear, or such that when the second sprocket rotates, the intermediate gears do not mesh with each other, when the parts at the ends of the belt When the pick-up position is reached, the control unit stops the second rotary drive unit.

A toothless portion is formed at the intermediate gear meshing with the sprocket.

The control unit sets the initial position of the second sprocket such that when the part at the end of the belt reaches the pick-up position, the toothless part of the intermediate gear reaches the other of the facing sprocket, the rotating drive gear and the intermediate gear The location of one of the .

Description of drawings

These and/or other aspects will become clear and easier to understand through the following description of the embodiments in conjunction with the accompanying drawings, in which:

1 is a schematic diagram showing a tape feeder according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a hole detection sensor (optical sensor) with a feeder in FIG. 1;

Figure 3 is an enlarged view of a tape end detecting sensor (tape end detecting sensor) in the tape feeder of Figure 1;

FIG. 4 is a schematic diagram illustrating the rotation of the second sprocket in chronological order according to the first embodiment of the present invention;

5 is a schematic diagram showing a mechanism for rotationally driving a second sprocket according to a second embodiment of the present invention;

Figure 6 is a top view partially showing the end of the strap in more detail.

Detailed ways

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as limited to the embodiments set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

FIG. 1 is a schematic diagram showing a tape feeder according to an embodiment of the present invention.

The tape feeder according to the embodiment shown in FIG. 1 includes components described below in a cuboid-shaped tape feeder body 1 .

A tape conveying path 2 is provided on the tape feeder main body 1 . The tape T is introduced from the tape introducing unit 2 a of the tape conveyance path 2 and guided along the tape conveyance path 2 . Although not shown, the belt T supports and holds the components at a specified pitch (constant pitch) along the length of the belt.

The first sprocket 3 is provided on the downstream side of the belt transport path 2 . The teeth of the first sprocket 3 interlock with belt transfer holes formed in the belt T at a constant pitch, and the belt T is pitch-transferred as the first sprocket 3 rotates at a pitch. The rotation shaft of the first motor 5 is connected to the first sprocket 3 via a plurality of intermediate gears 4 , wherein the first sprocket 3 is rotated by the rotation of the first motor 5 . A position adjacent to the downstream side of the first sprocket 3 corresponds to a component pickup position P. As shown in FIG.

The second sprocket 6 is provided on the upstream side of the first sprocket 3 , and the third sprocket 7 is provided on the upstream side of the second sprocket 6 . The teeth of each of the second sprocket 6 and the third sprocket 7 are meshed with the belt delivery holes formed in the belt T at a constant pitch, as the second sprocket 6 and the third sprocket 7 rotate. The tape T is conveyed along the tape conveyance path 2 . The second sprocket 6 and the third sprocket 7 are rotated via the plurality of intermediate gears 4 by the rotation of the second motor 8 and the third motor 9 , respectively. The rotations of the first motor 5 , the second motor 8 and the third motor 9 are controlled by the control unit 10 . Although the types of the first motor 5, the second motor 8, and the third motor 9 are not limited, a servo motor with an encoder is used in the current embodiment.

Between the second sprocket 6 and the third sprocket 7, an optical sensor 11 is arranged adjacent to the second sprocket 6 as a hole detection sensor for detecting a hole of the tape T positioned on the tape conveyance path 2, while A tape end detection sensor 12 for detecting the end of the tape T is arranged on the upstream side of the optical sensor 11 .

FIG. 2 is an enlarged view of a hole detection sensor (optical sensor) with a feeder in FIG. 1 .

The optical sensor 11 is a transmissive optical sensor, and includes a light emitting unit 11a arranged below the tape T conveyed on the tape conveying path 2, and a light receiving unit 11b arranged on the side of the tape T facing the light emitting unit 11a. above. Therefore, when the hole unit with T reaches a position corresponding to the optical axis position of the optical sensor 11, the amount of light received by the light receiving unit 11b increases. Information on the amount of light received by the light receiving unit 11b is sent to the control unit 10, and the control unit 10 detects the arrival of the aperture unit based on the increase in the amount of received light.

FIG. 3 is an enlarged view of a tape end detection sensor in the tape feeder in FIG. 1 .

As shown in FIG. 3 , the tape end detection sensor 12 is a mechanical sensor using a lever 12 a whose end is located in the tape conveyance path 2 and includes a lever 12 a and an optical sensor device 12 b. When the end of the strap T reaches the end of the lever 12a, the end of the lever 12a is lifted by the end of the strap T and rotated about the point 12a-1. Accordingly, the optical sensor device 12b is turned on, and the end of the tape T is detected. When the belt T is passed, the end of the lever 12a is kept lifted, and when the rear end of the belt T is passed, the end of the lever 12a is lowered. Therefore, the optical sensor device 12b is turned off, and the rear end portion of the tape T is detected. Information about the detection result of the end of the strap at the lever 12a is sent to the control unit 10 .

In the above-described configurations according to the above-described embodiments, one of two structures described below may be employed to reduce belt conveyance resistance during component mounting.

FIG. 4 is a schematic diagram showing the rotation of the second sprocket in chronological order according to the first embodiment of the present invention.

first embodiment

According to the first embodiment of the present invention, a toothless portion 6a is formed at the second sprocket 6 (as shown in FIG. 4 ). The toothless portion 6 a refers to a portion of the second sprocket 6 in which the teeth of the second sprocket 6 are omitted. In the toothless portion 6a, the teeth of the toothless portion 6a of the second sprocket 6 are continuously omitted, wherein the number of omitted teeth in the toothless portion 6a is at least equal to or greater than that in the belt transmission. The number of teeth meshing with belt T at path 2.

In the embodiment shown in FIG. 4, the total number of teeth of the second sprocket 6 is 40, the number of teeth meshing with the belt T at the belt conveying path 2 is 7, and in the toothless portion 6a The number of omitted gear teeth is also seven. By forming the toothless portion 6a as described above, when the toothless portion 6a reaches the belt conveyance path 2 as shown in (d) in FIG. Sliding on the toothless portion 6 a of the second sprocket 6 to be transmitted.

In the first embodiment as described above, the initial position of the second sprocket 6 can be set such that when the part at the end of the belt T as shown in (d) in FIG. 4 reaches the pick-up position P , the toothless portion 6a reaches the belt conveying path 2 .

In addition, although the initial position of the second sprocket 6 is set in the embodiment shown in FIG. , but there is no need to set the initial position in the current embodiment.

Even when the component at the end of the tape T reaches the pick-up position P, the cogless portion 6a does not reach the belt conveyance path 2, due to the combined rotation of the second sprocket 6, the cogless portion 6a eventually reaches the tape conveyance path 2. The combined rotation of the second sprocket 6 means that the second sprocket 6 rotates following the rotation of the first sprocket 3 . Since the second sprocket 6 does not rotate in conjunction thereafter, the belt conveyance resistance can be reduced. Of course, the initial position of the second sprocket 6 can be set as in the embodiment shown in FIG. 4 to reduce belt transport resistance from the beginning of the component mounting process.

Referring to FIG. 4 , from the time point when the end of the belt T (hole position H1 of the end) initially meshes with the teeth of the second sprocket 6 to the time point when the component at the end of the belt T reaches the pick-up position P, the belt T The distance that T is transmitted is 108mm.

Meanwhile, the teeth pitch of the second sprocket 6 is 4mm. Thus, when the belt T is conveyed a total distance of 108 mm, the second sprocket 6 rotates 108/4=27 teeth. Therefore, if the 27 gear teeth are reversely rotated from the time when the gearless portion 6a reaches the rotational position of the second sprocket 6 of the belt conveyance path 2 (as shown in (d) in FIG. 4 ), The position of the corresponding second sprocket 6 is set as the initial position of the second sprocket 6 , then when the component at the end of the tape T reaches the pick-up position P, the toothless portion 6a can reach the tape conveying path 2 .

The initial position is shown in (a) in FIG. Position H1 is engaged. The control unit 10 sets the initial position of the second sprocket 6 . The control unit 10 can set the rotational position shown in (a) in FIG. The initial position of the second sprocket 6.

(b) in FIG. 4 shows that the end of the belt T is fully engaged with the second sprocket 6 , that is, the 7 holes from the end of the belt T are engaged with the teeth of the second sprocket 6 . In addition, the end portion of the belt T is shown in (c) in FIG. 4 meshing with the first sprocket 3 . Furthermore, the arrival of the components at the end of the tape T to the pick-up position P is shown in (d) in FIG. 4 .

When the component at the end of the tape T reaches the pick-up position P, the control unit 10 stops the operation of the second motor 8 for rotationally driving the second sprocket 6 . The arrival of the part at the end of the tape T to the pick-up position P can be detected based on the encoder values from the second motor 8 and the first motor 5 .

In the state shown in (d) in FIG. 4 , the toothless portion 6 a is located at the belt conveying path 2 as described above, and the second motor 8 is stopped, and the second sprocket 6 does not rotate. Therefore, when the components are mounted after the state shown in (d) in FIG. 4 , the belt T is not engaged with the second sprocket 6 , and the belt T is and was transmitted. In other words, when the components are mounted, the second sprocket 6 rotates without coupling, and the belt transmission resistance can be reduced.

In the embodiment shown in FIG. 4, the number of teeth of the toothless portion 6a is equal to the number of teeth of the second sprocket 6 engaged with the belt T at the belt conveyance path 2 (7 teeth). However, the number of gear teeth of the gearless portion 6a may be greater than seven. In this case, the "specific position (tooth) 6b" of the second sprocket 6 is not limited to one position (one tooth), and there may be some margin around it. However, if the length of the cogless portion 6a becomes too long, the belt T cannot be properly conveyed by the cogs of the second sprocket 6 . Therefore, cog teeth can be continuously formed at the second sprocket 6, wherein the number of cog teeth can be at least the same as that used to transfer the belt T from the initial position as shown in (a) in FIG. The number of gear teeth at the position shown in (d) in 4 (27 gear teeth in the embodiment shown in FIG. 4 ) corresponds.

FIG. 5 is a schematic diagram showing a mechanism for rotationally driving the second sprocket 6 according to the second embodiment of the present invention.

second embodiment

According to the second embodiment of the present invention, a toothless portion 4e is formed at the intermediate gear 4a. Since the toothless portion 4e is formed at the intermediate gear 4a, even if the second sprocket 6 rotates in combination during mounting of the components, when the toothless portion 4e of the intermediate gear 4a reaches the sprocket fixed to the second sprocket 6 6c, the intermediate gear 4a and the gears between the intermediate gear 4a and the second motor 8 do not rotate either. Therefore, tape conveyance resistance can be reduced during component mounting.

In the second embodiment as described above, the initial position of the second sprocket 6 can be set so that when the part at the end of the belt reaches the pick-up position P (refer to FIG. 1 ), the toothless portion 4e reaches the facing The position of sprocket 6c.

Referring to FIG. 5 , four intermediate gears 4 a to 4 d are provided between the sprocket 6 c fixed to the second sprocket 6 and the rotation driving gear 8 a fixed to the second motor 8 . Here, the intermediate gear 4a is fixedly provided on the same shaft as the intermediate gear 4b, and the intermediate gear 4c is fixedly provided on the same shaft as the intermediate gear 4d. Moreover, the sprocket 6c meshes with the intermediate gear 4a, the intermediate gear 4b meshes with the intermediate gear 4c, and the intermediate gear 4d meshes with the rotation drive gear 8a. Here, the specified gear ratios (size ratios) for each mesh are as follows:

- sprocket 6c: intermediate gear 4a = 81:27

- intermediate gear 4b: intermediate gear 4c = 100:25

- intermediate gear 4d:rotation drive gear 8a = 100:30

Based on the combination of gears as described above, the rotation of the second motor 8 (rotation drive gear 8a) is decelerated and transmitted to the second sprocket 6 (sprocket 6c). The purpose of this design is that, based on the gear ratio, when the second motor 8 (rotation drive gear 8a) rotates one revolution, the second sprocket 6 (sprocket 6c) rotates 1/40 of a revolution. The total number of teeth of the second sprocket 6 is 40 (as described above with reference to Figure 4), corresponding to 1/40 of a revolution, the belt is conveyed at a pitch of one tooth (4mm).

The above descriptions are relative to the design dimensions. Actually, in the embodiment shown in FIG. 5, 3 teeth out of 27 teeth of the intermediate gear 4a are omitted to form a toothless portion 4e. In this case, when the rotational drive of the second motor 8 (rotational drive gear 8a) is transmitted to the second sprocket 6 (sprocket 6c), three teeth of the intermediate gear 4a (that is, the intermediate gear 4a 3/27 (1/9) of the teeth of the corresponding gear teeth are omitted. Therefore, the total gear ratio is 8/9 times that of the total gear ratio without the toothless portion 4e, so that when the second motor 8 (rotation drive gear 8a) rotates one revolution, the second sprocket 6 (sprocket 6c) rotates 1/45 turn (≒3.56mm). In other words, it is necessary to rotate the second motor 8 by 9/8 turns in order to convey the second sprocket 6 by 4mm pitch.

The initial position of the second sprocket 6 may be set as follows so that when the part at the end of the belt reaches the pick-up position P, the toothless portion 4e reaches a position facing the sprocket 6c.

First, as described above with reference to FIG. 4, from the initial position as shown in (a) in FIG. 4 until the part at the end of the belt as shown in (d) in FIG. The total distance transmitted is 108mm. The number of revolutions for conveying the tape 108 mm is 108 mm/4 mm x (9/8) = 30.375 revolutions.

In other words, if the position of the intermediate gear 4a rotated 30.375 turns in the opposite direction from the toothless portion 4e (as shown in FIG. 5 ) facing the sprocket 6c in time is the initial position, when the end of the belt When the part at the part reaches the pick-up position P, a state as shown in FIG. 5 is established. In addition, when the component at the end of the belt reaches the pick-up position P, the control unit 10 stops the second motor 8 . As a result, since the second sprocket 6 (sprocket 6c) does not mesh with the intermediate gear 4a during component mounting, even if the second sprocket 6 rotates in combination, the intermediate gear 4a and the distance between the intermediate gear 4a and the second motor 8 The gears don't spin either. Therefore, tape conveyance resistance can be reduced during component mounting.

Here, the control unit 10 sets the initial position of the second sprocket 6 . The control unit 10 can detect the position of the toothless portion 4e of the intermediate gear 4a based on the sensor data received from the detection sensor provided at the intermediate gear 4a, and the control unit 10 will move from the detected position of the toothless portion 4e along the Rotate 30.375 turns in the opposite direction to set the initial position.

Furthermore, although in the embodiment shown in FIG. 5, the toothless portion 4e is formed at the intermediate gear 4a, the toothless portion may also be formed on other intermediate gears. In other words, as long as the toothless portion does not mesh with other gears when the second sprocket 6 rotates, the toothless portion may be formed on the intermediate gears other than the intermediate gear 4a. However, in order to reduce belt conveying resistance during mounting of components, a gearless portion may be formed at the intermediate gear 4a meshing with the sprocket 6c (as in the embodiment shown in FIG. 5). The reason for this is that at least the intermediate gear 4 a rotates in conjunction with the second sprocket 6 if the gearless portion is formed at the gear between the intermediate gear 4 a and the second motor 8 .

Furthermore, there is no need to set the initial position of the second sprocket 6 in the second embodiment either.

Even when the part at the end of the belt T reaches the pick-up position P, the toothless portion 4e does not reach the position facing the sprocket 6c, due to the combined rotation of the second sprocket 6, the toothless portion 4e eventually reaches The position facing the sprocket 6c. Since the gear between the intermediate gear 4a and the second motor 8 does not rotate afterwards, belt conveyance resistance can be reduced during component mounting. Of course, the initial position of the second sprocket 6 can be set as described above to reduce belt conveyance resistance from the beginning of the component mounting process.

In addition, in the first and second embodiments as described above, the third sprocket 7 rotates in combination during the installation of components, wherein a one-way motor 9 may be provided between the third sprocket 7 and the third motor 9 clutch to reduce the belt transmission resistance, and the first embodiment or the second embodiment can be applied to the third sprocket 7 to reduce the belt transmission resistance.

Next, a method of smoothly engaging the holes at the ends of the belt with the sprockets will be described. This approach shows common technical features of the first and second embodiments.

First, in order to smoothly engage the hole at the end of the tape T with the sprocket, the tape T may be cut from the center of the hole H1 at the end of the tape T perpendicular to the direction in which the tape T is conveyed (as shown in FIG. 4 ). Show). Therefore, the hole H1 at the end of the belt T is smoothly engaged with the teeth of the sprocket.

Figure 6 is a top view partially showing the end of the strap in more detail.

At the same time, if the end of the tape T and the center of the hole H1 of said end is shifted by L, the control unit 10 detects the dimension L and when putting the tape T on the sprocket or removing it from the sprocket At T, the rotation of the sprocket is shifted (delayed) by L.

The value of L is calculated based on the belt end position detected by the belt end detection sensor 12 (shown in FIG. 1 ) and the encoder value of the third motor 9 for rotationally driving the third sprocket 7 . In other words, the position of the hole H1 of the tape T can be determined based on the encoder value from the third motor 9, and L can be calculated by comparing the position of the hole H1 with the position of the tape end detected by the tape end detection sensor 12. value. In addition, when putting the belt T on the sprocket (the second sprocket 6 or the first sprocket 3) or removing the belt T from the sprocket (the second sprocket 6 or the first sprocket 3), it is possible to The hole H1 at the end of the belt T is smoothly engaged with the sprocket by shifting (delaying) L the rotation of the sprocket.

In addition, for example, when removing the belt from the third sprocket 7 and putting it on the second sprocket 6, the third motor 9 and the second motor 8 can be alternately operated little by little so that the third chain The rotation of the wheel 7 is synchronized to be similar to the rotation of the second sprocket 6 . Actually, it is difficult to completely synchronize the two motors by simultaneously rotating the two motors, and the power consumed by the motors increases.

For example, during conveyance at a common pitch, the second motor 8 rotates one revolution. Here, the second electric motor 8 rotates, for example, by 1/20 of a revolution, and the third electric motor 9 rotates correspondingly, wherein the electric motors are operated alternately. In addition, when the belt is removed from the second sprocket 6 and put on the first sprocket 3, the second motor 8 and the first motor 5 can be alternately operated bit by bit so that the second sprocket 6 The rotation of is synchronized to be similar to the rotation of the first sprocket 3.

As described above, according to one or more of the above-described embodiments of the present invention, since the number of consecutively omitted teeth of the second sprocket corresponds to the number of teeth engaged with the belt at the belt conveying path, when When the cogless portion reaches the belt transport path, the belt is not engaged with the second sprocket, and the belt is conveyed by sliding on the cogless portion of the second sprocket. In other words, since the second sprocket rotates without coupling when the components are mounted, belt conveyance resistance can be reduced.

As described above, according to one or more of the above-described embodiments of the present invention, since the gearless portion that does not mesh with other gears is provided at the intermediate gear for transmitting the rotational drive of the second motor to the second sprocket, So even if the second sprocket rotates in combination, when the toothless portion of the intermediate gear reaches a position facing the other gear, the intermediate gear and the gears between the intermediate gear and the second rotation driving unit (such as the second motor) also Does not rotate. Therefore, tape conveyance resistance can be reduced during component mounting.

It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.

While one or more embodiments of the invention have been described with reference to the drawings, those of ordinary skill in the art will appreciate that modifications may be made thereto without departing from the spirit and scope of the invention as defined by the claims. and various changes in details.

Claims (6)

Claims 1. A tape feeder for supplying components to a pick-up position of a component mounting device by pitching a tape for supporting and holding the components, the tape feeder comprising: a first sprocket engaging with holes formed on the belt at a constant pitch and conveying the belt; a first rotary drive unit to rotate the first sprocket; a second sprocket, disposed on the upstream side of the first sprocket, engages with holes formed on the belt at a constant pitch, and conveys the belt; a second rotary drive unit to rotate the second sprocket; a control unit controlling the operation of the first rotary drive unit and the second rotary drive unit, wherein the teeth of the second sprocket are consecutively omitted, the number of omitted teeth being at least equal to the number of teeth of the second sprocket meshing with the belt at the belt transport path, When the component at the end of the belt reaches the pick-up position, the control unit stops the second rotary drive unit. 2. The tape feeder according to claim 1, wherein the teeth of the second sprocket are continuously omitted, and the number of omitted teeth is equal to the number of wheels of the second sprocket meshing with the belt at the belt conveyance path. number of teeth. 3. The tape feeder according to claim 2, wherein the control unit sets the initial position of the second sprocket such that when the part at the end of the tape reaches the pick-up position, the toothless portion of the second sprocket Arrival belt conveyor path. 4. A tape feeder for supplying components to a pick-up position of a component mounting apparatus by pitching a tape for supporting and holding the components, the tape feeder comprising: a first sprocket engaging with holes formed on the belt at a constant pitch and conveying the belt; a first rotary drive unit to rotate the first sprocket; a second sprocket, disposed on the upstream side of the first sprocket, engages with holes formed on the belt at a constant pitch, and conveys the belt; a second rotary drive unit to rotate the second sprocket; a control unit controlling the operation of the first rotary drive unit and the second rotary drive unit, wherein an intermediate gear or intermediate gears are provided between the sprocket fixed to the second sprocket and the rotation drive gear fixed to the second rotation drive unit, Providing a gearless portion at the intermediate gear so that when the second sprocket rotates, the intermediate gear does not mesh with the sprocket or the rotation drive gear, or such that the intermediate gears do not mesh with each other when the second sprocket rotates , When the component at the end of the belt reaches the pick-up position, the control unit stops the second rotary drive unit. 5. The tape feeder according to claim 4, wherein the gearless portion is formed at an intermediate gear meshing with the sprocket. 6. The tape feeder of claim 4, wherein the control unit sets the initial position of the second sprocket such that when the part at the end of the tape reaches the pick-up position, the toothless portion of the intermediate gear reaches the surface The position of one of the sprocket, the rotating drive gear and the other of the intermediate gear.