JPH0553688B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention uses a pulse motor or a step motor to reinforce the torque output to the shaft in a mechanism that rotates the main shaft by a fixed angle each time. related to a device for

[Prior Art] FIG. 6 shows taped electronic components a,
A mechanical part of a device that selectively extracts an arbitrary electronic component a from a group of a is shown.

The electronic components a, a... have their lead wires c, c... held on a tape b at regular intervals, and the tape b is held intermittently at intervals of the electronic components a, a... by the transport drum 3. It shall be sent to the
A puller blade 9 with four arms is fixed to the rotatable main shaft 2, and this is located at the position where the electronic components a, a... are stopped, and the lowermost arm is the lead wire c of the stopped electronic component a. It is located at the base of the

Further, the main shaft 2 is driven by the pulse motor 1 via a transmission mechanism 8 composed of a helical gear.
This pulse motor 1 rotates by a certain angle when a starting signal is input, and rotates the main shaft 2 by 90 degrees in the direction of the arrow.
Rotate only.

For example, in the inspection process of electronic components a, a...
When it is confirmed that a particular electronic component a is a defective product, a start signal is input to the pulse motor 1 in synchronization with the electronic component a stopping at the position of the pulling blade 9. Then, the pulling blade 9 is rotated by 90° in the direction of the arrow, and the electronic component a is pulled out from the tape b.

[Problems to be Solved by the Invention] Devices using a fixed angle rotation mechanism as described above are often used in devices constructed for the purpose of automation, but the biggest drawback is that This means that there is insufficient force (torque) to carry out the work. In particular, pulse motors and step motors used as drive sources have a special winding structure that makes it difficult to generate large torque.
It has the characteristic that the inertia of the rotor increases and the accuracy of each rotation deteriorates. Therefore, there is a limit to the torque that can be obtained.

Therefore, with only the torque obtained from the pulse motor, the torque applied to the pulling blades 9 in the above electronic component pulling device easily overcomes the resistance generated between the tape b and the electronic component a. Therefore, electronic component a cannot be pulled out smoothly.

The present invention was made to solve the above-mentioned problems in the conventional constant angle rotation mechanism.

[Means for Solving the Problems] Referring to the reference numerals in FIGS. 1 to 5, the configuration of the present invention will be described. A drive wheel 14 is connected to an auxiliary drive source 13 that constantly rotates. In addition, the main shaft 1 is connected to the main drive source 11 that rotates by a fixed angle every time.
2 is driven, and a driven wheel 15 is connected to this main shaft 12. The driven wheels 15 are provided with transmission parts 16, 16, . . . driven by the driving wheels 14 at regular intervals, and non-transmission parts 17, 17, . Then, the transmission section 1
The intervals of 6, 16, . . . are set equal to one rotation angle of the driven wheel 15 by the main drive source 11.

[Function] When using this torque reinforcing device, when the main drive source 11 is stopped, the drive wheel 14 on the auxiliary drive source 13 side is connected to the non-transmission portion 17 of the driven wheel 15, as shown in FIG. , 17... are adjusted in advance.

From this initial state, when the main drive source 11 is rotated in the direction of the arrow in FIG.
It is rotated in the direction of the arrow in FIG. Then,
Since the driven wheel 15 connected to the main shaft 12 is also rotated, the transmission parts 16, 16... of the driven wheel 15 correspond to the driving wheel 14, as shown in FIG. is transmitted to the main shaft 12 via the driving wheel 14 and the driven wheel 15. During this time, the total torque given from the two drive sources, the main drive source 11 and the auxiliary drive source 13, is output to the main shaft 12.

Furthermore, at the time when the main drive source 11 finishes one rotation, the driven wheel 15 has also rotated by one angle, so the driving wheel 14 moves to the next non-transmission part 17, 17, etc. after the driven wheel 15. Correspondingly, the main shaft 12 of the auxiliary drive source 13 is separated. Therefore, the rotation of the auxiliary drive source 13 is not transmitted to the main drive source 11, and the main shaft 12 stops.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 to 5.

The embodiment shown in FIG. 1 is an example in which the torque reinforcing device according to the present invention is applied to the electronic component extraction device already exemplified in the section of the prior art. That is, a pulse motor is used as the main drive source 11, and its rotating shaft is transmitted to the main shaft 12 via a transmission mechanism 18 composed of a helical gear. The main shaft 12 is rotated by 90 degrees each time the main drive source 11 rotates once. A pulling blade 19 having four arms is attached to one end side of this main shaft 12.
is fixed, and this is the position where electronic components a, a, . And main drive source 1
Each time the tape 1 rotates, this rotation is transmitted to the main shaft 12, and the pulling blades 19 rotate to pull out the electronic component a from the tape b.

In addition, as already mentioned, electronic parts a, a...
The lead wires c, c, . . . are held at regular intervals on the tape b, and the tape b is intermittently fed by the conveyance drum 22 at pitches corresponding to the intervals between the electronic components a, a, .

Further, a driven wheel 15 is fixed to the other end of the main shaft 12. In the embodiment shown in FIGS. 1 to 3, an intermittent friction wheel is used as the driven wheel 15,
Transmitting portions 16, 16, . . . are formed at 90° intervals, and non-transmitting portions 17, 17, . . . are formed at 90° intervals therebetween.

The transmission parts 16, 16... have a circumferential surface centered on the main shaft 12, and the non-transmission parts 17, 17... have a concave surface recessed toward the center from this circumferential surface. The outer circumferential surface 20 forming the transmitting parts 16, 16... and the non-transmitting parts 17, 17... is made of rubber with a high coefficient of friction.

An auxiliary drive source 13 that always rotates at a constant speed is provided, and a drive wheel 14 is attached to this rotating shaft. In the embodiment shown in FIGS. 1 and 2, a friction wheel is used as the drive wheel 14, and its outer peripheral portion 21 is made of rubber or the like having a high coefficient of friction.
The main shaft 12 and the rotation axis of the auxiliary drive source 13 are arranged in parallel, and the distance between the center axes is such that the drive wheel 1
4 and the radius of the transmission portions 16, 16, . . . of the driven wheels 15.

Therefore, when the main drive source 11 is not rotating, as shown in FIG.
17... is initially set to correspond to the driven wheel 15, unless the driven wheel 15 rotates from this state, the driving wheel 14 and the driven wheel 15 are separated, and the rotation of the auxiliary drive source 13 will not be caused by the main shaft 12. Not communicated.

However, the main drive source 11 rotates and the main shaft 12
When rotated once, i.e. by 90°, the driven wheel 15
During this period, the transmission part 1 of the driven wheel 15 also rotates.
6, 16, . . . are in contact with the driving wheel 14 as shown in FIG. Therefore, during this period, the total torque generated by the main drive source 11 and the auxiliary drive source 13 is transmitted to the main shaft 12. Note that the rotation of the auxiliary drive source 13 is transmitted to the main shaft 12 only within a range of approximately 45° out of the total rotation angle of 90° for one rotation, where the driven wheel 15 of the driving wheel 14 contacts.

In addition, in the above embodiment, the outer peripheral portion 2 of the drive wheel 14
0 and the outer peripheral portion 21 of the driven wheel 15 are both made of rubber, but this is to obtain the friction necessary for transmitting rotation, and is not necessarily limited to such a material. For example, one or both peripheral surfaces may be made of rubber-lined fiber material or leather, or the metal surface may be round-knurled to ensure the necessary coefficient of friction.

4 and 5 show a case where the driving wheel 14 and the driven wheel 15 are constructed of gears. Of these, the driven wheel 15 is made of a partial gear, and the toothed portions are transmission portions 16, 16, . . . and the toothless portions are non-transmission portions 17, 17, . That is,
The driven wheel 15 meshes with the drive wheel 14 only at the toothed transmission portions 16, 16, . . . , and the rotation of the auxiliary drive source 13 is transmitted to the main shaft 12 only during that period. Of course, the rotation of the auxiliary drive source 13 is not transmitted to the main shaft 12 in the non-transmission parts 17, 17, .

In the above embodiment, the driven wheel 15 is directly fixed to the main shaft 12, and the driving wheel 14 is fixed directly to the rotating shaft of the auxiliary drive source 13, but these may be connected via a transmission mechanism such as a gear mechanism. You can also.

[Effects of the Invention] As described above, according to the present invention, the lack of torque of a pulse motor, a step motor, etc. with weak torque can be compensated for by the auxiliary drive source 13 in accordance with the rotation of these motors. Moreover, since the auxiliary drive source 13 is a constantly rotating drive source, it is not affected by fluctuations in torque during startup, and can reinforce the torque in a timely manner.
When the main shaft 12 should stop, the auxiliary drive source 13 and the main shaft 12 are completely disconnected.
The second side is not affected by the inertia of the auxiliary drive source 13 at all.

Therefore, a strong torque can be obtained, and at the same time, high rotational accuracy can be obtained without being affected by inertia.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram of a constant angle rotation mechanism using a torque reinforcing device showing an embodiment of the present invention, and FIGS. 2 and 3 are front views showing the relationship between a driving wheel and a driven wheel in the same embodiment. , FIGS. 4 and 5 are front views showing other embodiments of the driving wheel and the driven wheel, and FIG. 6 is a front view showing another embodiment of the driving wheel and the driven wheel.
FIG. 2 is a mechanism diagram showing a conventional example of a constant angle rotation mechanism. 11... Main drive source, 12... Main shaft, 13... Auxiliary drive source, 14... Drive wheel, 15... Driven wheel, 1
6...Transmission part, 17...Non-transmission part.

Claims (1)

[Claims] 1. Main drive source 11 that rotates by a fixed angle every time.
In a fixed angle rotation mechanism consisting of a main shaft 12 driven by the main drive source 11, a drive wheel 14 is connected to an auxiliary drive source 13 that rotates constantly, a driven wheel 15 is connected to the main shaft 12, and the driven wheel 15 is connected to the main shaft 12. The driving wheels 15 are provided with transmission parts 16, 16, .
6, 16... by the driven wheel 1 by the main drive source 11
A torque reinforcing device for a constant angle rotation mechanism, characterized in that the torque reinforcement device is set equal to the rotation angle of one rotation of item 5. 2. The torque reinforcing device according to claim 1, wherein the driven wheel 15 is an intermittent friction wheel. 3. The torque reinforcing device according to claim 1, wherein the driven wheel 15 is a partial gear.