JP2001300882A - Hand-held vacuum suction tweezers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide vacuum suction tweezers that are inexpensive, have a long battery life and are small and light. SOLUTION: The vacuum suction tweezers comprise a motor 6 capable of normal rotation on a depression of a push button 9 and of reverse rotation on a release thereof, a cylinder 3 having a suction nozzle 14 at the tip, a piston 2 capable of reciprocation along the length of the cylinder, a nonrotatable piston shaft 17 connected to the piston and formed with a threaded portion 17a, a secondary gear 8 whose internal circumferential portion is threaded on the threaded portion of the piston shaft and whose external circumferential portion is engaged with a primary gear 7 on the output shaft of the motor, a first spring 21 for energizing the secondary gear toward the base end, a secondary gear position detecting switch 16 for detecting a movement of the secondary gear toward the tip end against the energizing force of the first spring and then stopping the motor, and a piston starting point detecting switch 15 for detecting a return of the piston to the cylinder tip-side initial position thereof by reverse rotation of the motor and then stopping the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the mounting and transporting of electronic parts such as ICs and LSIs, precision small parts such as watches and clocks, and other small articles by utilizing the attraction force of vacuum, or in the physics and chemistry fields. The present invention relates to a vacuum suction tweezer suitable for handling work. In particular, the present invention relates to a portable hand-held vacuum suction tweezer which can be used without being connected to a station provided with a pump via an air hose.

[0002]

2. Description of the Related Art Conventionally, there are two types of hand-held vacuum suction tweezers: a rechargeable type and a manual type.

[0003] The rechargeable type is inside the hand-held grip,
A battery, a motor, and a vacuum pump are built in, and the suction force of the vacuum pump is applied to a nozzle attached to the grip. Therefore, when the vacuum suction tweezers are operated by pressing the push button provided on the grip, various components can be sucked up through the suction pad attached to the tip of the nozzle.

That is, when a component is to be sucked, the suction can be performed by bringing a suction pad into contact with the upper surface of the component, pressing a push button, and operating a vacuum pump. Then, after the component is moved to a predetermined position while the vacuum pump is operating, the vacuum pump is stopped by releasing the push button, and the component is released.

On the other hand, the manual type includes a type using a dropper as a vacuum generator and a type using a piston and a syringe like a syringe.

In a device using a dropper, after the dropper is deformed with a finger, a vacuum is created by using the restoring force. In this case, when the syringe is deformed with a finger and then restored, the component may be sucked through the nozzle and the suction pad connected to the syringe, the component may be moved to a predetermined location, and then the syringe may be pushed and released.

[0007] Further, a syringe using a syringe is provided with a compression spring in a syringe. The spring is compressed by pushing the piston with a finger, and the piston is pushed up by the restoring force of the spring to create a vacuum. is there. In this case, a suction pad is provided at the tip of the syringe, and after pressing the piston with a finger, the component can be suctioned and moved to a predetermined location.

[0008]

As described above, the hand-held vacuum suction tweezers do not have a connection hose to the grip portion and have good operability, but the conventional one has the following problems.

First, the rechargeable battery uses an expensive rechargeable battery, and requires a spare battery, a charger, an adapter, and the like. Further, a diaphragm type or vane type vacuum pump which must be driven by a motor is used, and a high output motor for driving these pumps is required. For these reasons, the rechargeable type is expensive.

Also, in the conventional rechargeable type, the vacuum pump is continuously operated from the suction of the parts to the opening after the parts are conveyed, and the degree of vacuum remains increased during the suction of the parts. Since the motor load increases and the current also increases, the operating life of the battery is shortened.

Further, the conventional rechargeable type is large in size and heavy since it has a built-in rechargeable battery, motor and vacuum pump.

On the other hand, in the conventional manual type, in both the dropper type and the syringe type, the vacuum is operated with a fingertip, so that a considerable force is required for the operation. Burden was heavy. In addition, since the syringe type cannot be operated while holding the pen, it is not suitable for detailed operations.

The present invention has been made in view of the above circumstances, and its main objects are to provide a low cost, a long battery life,
An object of the present invention is to provide a hand-held vacuum suction forceps that is small, lightweight, easy to operate, and can easily perform fine work.

[0014]

In order to achieve the above-mentioned object, a first hand-held vacuum suction forceps according to the present invention is characterized in that it has the following basic structure. (1) A drive motor that rotates forward when operated by an operator and reverses when the operation is released. (2) A cylinder having a suction nozzle at the tip. (3) A piston that is fitted in the cylinder in an airtight manner and that can move back and forth along the longitudinal direction of the cylinder. (4) A piston shaft that is connected to the piston on the distal end side, has a threaded portion on the outer peripheral surface on the base end side, and is axially movable with respect to the cylinder. (5) The inner peripheral portion is threadably engaged with the thread portion of the piston shaft so as to advance and retreat, and the outer peripheral portion is engaged with the primary gear of the output shaft of the drive motor to be rotatable. A secondary gear that moves the shaft to the proximal end while moving the piston shaft to the distal end during reverse rotation. (6) A piston end point detection switch that stops the rotation of the drive motor by detecting that the piston has moved to the base end of the cylinder due to the forward rotation of the drive motor. (7) A piston start point detection switch that stops rotation of the drive motor by detecting that the piston has returned to the initial position on the cylinder tip side due to reverse rotation of the drive motor.

The second hand-held vacuum suction forceps according to the present invention is characterized in that it has the following basic structure. (1) A drive motor that rotates forward when operated by an operator and reverses when the operation is released. (2) A cylinder having a suction nozzle at the tip. (3) A piston that is fitted in the cylinder in an airtight manner and that can move back and forth along the longitudinal direction of the cylinder. (4) A piston shaft that is connected to the piston on the distal end side, has a threaded portion on the outer peripheral surface on the base end side, and is axially movable with respect to the cylinder. (5) The inner peripheral portion is threadably engaged with the thread portion of the piston shaft so as to advance and retreat, and the outer peripheral portion is engaged with the primary gear of the output shaft of the drive motor to be rotatable. A secondary gear that moves the shaft to the proximal end while moving the piston shaft to the distal end during reverse rotation, and that can move slightly along the axial direction of the primary gear together with the piston shaft. (6) A first spring that biases the secondary gear toward the base end. (7) Stopping the drive motor by detecting that the secondary gear has moved to the tip end side with respect to the primary gear against the urging force of the first spring when the inside of the cylinder has a predetermined degree of vacuum or more. Secondary gear position detection switch to be activated. (8) A piston start point detection switch that stops rotation of the drive motor by detecting that the piston has returned to the initial position on the tip side of the cylinder due to reverse rotation of the drive motor.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The hand-held vacuum suction forceps 1 of the present invention will be described in more detail below.

FIGS. 1 and 2 are longitudinal sectional views showing one embodiment of the vacuum suction forceps 1 of the present invention. FIG. 1 shows a state in which a piston 2 is at a starting point position, and FIG. 3 shows a state at an intermediate position. FIG. 3 is a perspective view showing a main part of the internal structure of the vacuum suction tweezers 1 of this embodiment, and FIG. 4 is a circuit diagram of the vacuum suction tweezers 1 of this embodiment.

The vacuum suction tweezers 1 of this embodiment includes a pencil-shaped grip case 4 in which a suction mechanism, a power supply battery 5 and the like are built. The grip case 4 is pencil-shaped, so it is easy to hold,
Easy to work.

The vacuum suction tweezers 1 includes a drive motor 6
Driven by In this embodiment, a small-output small motor (1.5 V) is used, and a vacuum generator composed of a piston 2 and a cylinder 3 is driven via gears 7, 8, and the like.

The drive motor 6 is configured to rotate normally when operated by an operator, and to rotate reversely when the operation is released. This operation is performed, for example, by pushing a push button 9 protruding from the upper surface on the distal end side of the grip case 4. A part of the push button 9 is pivotally supported by the grip case 4 and can be pushed so as to rotate about the pivot 10. And push button 9
A portion for operating the operation switch 11 is provided, and a tube deforming convex portion for deforming a tube 13 of a branch air passage 12 for vacuum breaking described later is provided at an end portion on the tip side of the pivot 10. 9a are formed.

The operator can press the push button 9 protruding from the grip case 4 to rotate the drive motor 6 in the normal direction and suck the component through the suction nozzle 14.
Release the push button 9 and press the push button 9
By returning to the original state, the drive motor 6 can be reversed to return the suction mechanism to the initial state. In order to realize this operation, as shown in FIG. 4, an electric circuit including a power supply battery 5, a drive motor 6, an operation switch 11, a piston start point detection switch 15 and a secondary gear position detection switch 16 is used. I have. By pressing the normally open (NO) switch with the push button 9 to close it, the normally closed (NC) switch is opened, and the flow of the supply current to the drive motor 6 is increased. Can be changed. In the circuit shown, the piston start point detection switch 15 is turned off at the piston start point, and the secondary gear position detection switch 16 is
The inside of the cylinder 3 is turned off when the degree of vacuum is equal to or higher than a predetermined value or the piston shaft 17 is pulled out to the proximal end side up to the maximum stroke.

A substantially cylindrical cylinder 3 is built in the tip side of the grip case 4. This cylinder 3
Is opened at the base end side, and a slender passage 3a is integrally formed at the tip end, and the tip end of the passage 3a protrudes from the grip case 4 to the tip end side. And
An elongated suction nozzle 1 is provided at the tip of the elongated passage 3a.
4 are connected, and a suction pad 18 is attached to the tip of the suction nozzle 14. Therefore, the suction force on the cylinder 3 side can act on the suction pad 18 via the suction nozzle 14, and the suction pad 18
Can suck the part A (FIG. 2).

The piston 2 is fitted in the cylinder 3 in an airtight state. The piston 2 is connected to a piston shaft 17 that can move axially with respect to the cylinder 3. The piston shaft 17 is an elongate rod having a distal end connected to the piston 2 and a proximal end protruding from the cylinder 3 and extending toward the proximal end. Piston shaft 1
With the movement of 7, the piston 2 can move forward and backward along the longitudinal direction of the piston shaft 17.

A thread is formed on the outer peripheral surface on the base end side of the piston shaft 17 to form a threaded portion 17a. Further, two blades 17b, 17b are formed on the piston shaft 17 so as to be opposed to each other and arranged on the same plane so as to protrude, adjacent to the end on the tip end side of the screw portion 17a. In the illustrated example, two blades 17b, 17b protruding in the front-rear direction of the piston shaft 17 are arranged in a horizontal state. The blades 17b are arranged along the horizontal plane on the lower surface of the drive motor 6. Thereby, the piston shaft 1
7 impinges on the side surface of the motor 6 and the rotation of the piston shaft 17 is prevented.

The secondary gear 8 is threadably engaged with the screw portion 17a of the piston shaft 17 so as to be able to advance and retreat. That is, the secondary gear 8 has a screw hole in the inner peripheral portion, and the screw hole is screwed to the screw portion 17 a of the piston shaft 17 so as to be able to advance and retreat. On the other hand, a gear is formed on the outer peripheral portion of the secondary gear 8,
This gear is rotatable by meshing with a primary gear 7 provided on an output shaft of a drive motor 6. The ratio of the number of teeth between the primary gear 7 and the secondary gear 8 is 8 in this embodiment.
The rotation of the primary gear 7 on the drive motor 6 side is reduced and transmitted to the secondary gear 8.

With the above configuration, the rotational force of the drive motor 6 is transmitted from the primary gear 7 to the piston shaft 17 via the secondary gear 8. However, as described above, since the piston shaft 17 cannot be rotated, the piston shaft 17 eventually moves along the longitudinal direction with the rotation of the drive motor 6. here,
When the drive motor 6 rotates forward, the piston shaft 17 can be moved toward the base end, and when the drive motor 6 is rotated backward, the piston shaft 17 can be moved toward the distal end.

The secondary gear 8 has a piston shaft 17
Is disposed between two bearings 19 and 20 which hold the base end of the bearing. The bearings 19 and 20 are arranged at positions sandwiching the primary gear 7. Then, between the bearing 19 on the distal end side and the secondary gear 8, a first biasing urging of the secondary gear 8 to the proximal end side is performed.
A spring 21 is provided. The first spring 21 of this embodiment is formed by a compressed coil spring, and is fitted and arranged on the piston shaft 17. The first spring 21 has a distal end in contact with the bearing 19 and a proximal end in contact with the secondary gear 8 via a flat washer 22. As a result, the secondary gear 8 is attached to the base-side bearing 20 by the flat washer 23 by the urging force of the first spring 21.
Is pressed so as to be brought into contact with the contact.

The secondary gear 8 is slightly slidable along the axial direction of the primary gear 7 together with the piston shaft 17 within a range where the engagement with the primary gear 7 is not released. In other words, the secondary gear 8 can move toward the distal end while engaging the urging force of the first spring 21 in a state of being engaged with the primary gear 7.

When this movement of the secondary gear 8 occurs, it is detected by the secondary gear position detection switch 16. The secondary gear position detection switch 16 of the present embodiment is constituted by a limit switch.
A pin or lever for detecting the limit position of the
The position of the secondary gear 8 is detected by contacting or separating from one axial end surface (a base end surface in the illustrated example).

By the way, a piston start point detection switch 15 is arranged near the base end side opening of the cylinder 3. The piston start point detection switch 15 detects that the piston 2 has returned to the initial position on the cylinder tip side by the reverse rotation of the drive motor 6 and stops the rotation of the drive motor 6.

The piston start point detection switch 15 of the present embodiment
Consists of limit switches. A pin or lever for detecting the limit position of the limit switch 15 is provided with a sensor dog 17 projecting from the piston shaft 17.
By being moved by b, it is detected that the piston 2 has returned to the initial position on the cylinder tip side. As the sensor dog 17b, one of the two blades protruding from the piston shaft 17 is used. That is, the blade 17b formed on the piston shaft 17 functions as a sensor dog and also as a rotation stop.

At the base end of the grip case 4, a battery 5 for driving a drive motor 6 is arranged. In this embodiment, an AA battery (1.5 V) is used. In order to dispose the dry battery 5, the battery case side and the mechanical section are partitioned by a partition wall 4a, and a part of the partition wall 4a functions as a piston stopper 4b. When the piston 2 moves to the base end of the cylinder 3, a part of the piston shaft 17 (the base end in the present embodiment) is brought into contact with the piston stopper 4 b, and the piston stopper 4 b further moves. 17 is prevented from moving toward the proximal end. This prevents the piston 2 from falling off the cylinder 3.

On the side wall of the distal end of the cylinder 3, there is provided a branch air passage 12 for vacuum breaking for communicating the inside and the outside of the cylinder 3 and opening the inside of the cylinder 3 to the outside pressure. A flexible tube 13 is connected to the branch air passage 12 for vacuum breaking, and the tube 13 extends along the inner surface of the side wall of the grip case 4 toward the push button 9 and is opened. And the tip of the tube 13
The push button 9 is disposed between the side wall of the grip case 4 and the tube deforming projection 9 a at the tip of the push button 9.
Therefore, when the operator pushes the push button 9, a part of the tube 13 is pressed against the inner surface of the grip case 4 and crushed by the tube deforming convex portion 9 a of the push button 9, and the branch air passage 12 for vacuum breaking is provided. Is closed. On the other hand, when the pushing of the push button 9 is released, the tube 1
3 is released. Thereby, the tube 1
The deformed portion 3 is restored to its original state, and the branch air passage 12 for vacuum breaking is opened.

Next, the vacuum suction forceps 1 of this embodiment
The state of use will be described. First, with the suction pad 18 lightly touching the component A, the push button 9 is pushed downward. As a result, the tube deformation convex portion 9A at the tip of the push button 9 is connected to the tube 1 of the vacuum break branch air passage 12.
3, the cylinder 3 is closed by closing the branch air passage 12 for vacuum breaking. Further, when the push button 9 is pressed, the drive motor 6 is driven to rotate forward, and its rotational force is transmitted to the primary gear 7 and the secondary gear 8. That is, the rotational force of the motor 6 is transmitted from the primary gear 7 to the secondary gear 8 at a reduced speed corresponding to the number of teeth, and rotates the secondary gear 8.

However, the rotation of the piston shaft 17 is prevented by the blade 17b for stopping rotation, and the secondary gear 8 is pressed by the first spring 21 toward the opposite side of the cylinder (the base end) at the time of starting. Therefore, the piston shaft 17 is, as shown in FIG.
It is pulled and moved toward the base end by one pitch per rotation, and a vacuum is generated in the cylinder 3. In this embodiment, the piston shaft 17 is fed in the axial direction by 0.5 mm per rotation. Then, the component A can be sucked to the suction pad 18 through the suction nozzle 14 connected to the cylinder 3 by the suction force of the vacuum.

As the motor 6 continues to rotate, the degree of vacuum in the cylinder 3 increases, and the piston shaft 17 receives a force that is pushed back to the tip of the cylinder. When the rotation is further continued, the push-back force of the piston 2 becomes larger than the repulsive force of the first spring 21. Then
The secondary gear 8 slides toward the cylinder 3 while compressing the first spring 21 while opposing the urging force of the first spring 21. Therefore, by making the spring pressure appropriate, it is possible to determine the slide amount at a predetermined degree of vacuum. That is, when the degree of vacuum reaches a predetermined level or more, the secondary gear 8 can be moved to the distal end side.
The presence or absence of this movement is determined by the secondary gear position detection switch 1.
The detection at 6 makes it possible to automatically stop the rotation of the drive motor 6 when the secondary gear 8 moves to the distal end with a predetermined degree of vacuum.

Incidentally, there is a case where the vacuum leaks little by little depending on the condition of the suction surface of the component A.
Since the spring 21 automatically extends and slides the secondary gear 8 toward the base end, the drive motor 6 is driven again. Thus, according to the configuration of this embodiment,
The drive motor 6 can be automatically rotated or stopped depending on the presence or absence of a predetermined degree of vacuum, and unnecessary drive of the motor 6 can be avoided.

When the piston shaft 17 has moved to the maximum stroke, the rear end of the piston shaft 17 on the base end side contacts the piston stopper 4b. In this case as well, the drive motor 6 continues to rotate, but the secondary shaft 8 moves to the cylinder 3 side because the piston shaft 17 cannot move. Then, the secondary gear position detection switch 16 operates to stop the motor 6. Therefore, there is no possibility that the piston 2 will fall off the cylinder 3.

Since the above-described mechanism is employed, it is not necessary to always move the piston 2 to the full stroke of the cylinder 3, and it is possible to greatly reduce energy consumption. Moreover, since the operation time is short, comfortable work is also possible.

In this manner, the component A
Then, the component A can be released from the suction pad 18 by releasing the push of the push button 9 after sucking and moving to the predetermined position. That is, the circuit is switched by the release of the push button 9, the circuit is switched, the drive motor 6 is reversed, and the piston 2 is moved to the end of the cylinder until the sensor dog 17 b is detected by the piston start position detection switch 15. Will be returned. In addition, when the push button 9 is released, the branch air passage 12 for vacuum break provided at the tip of the cylinder 3 is opened, and the vacuum in the cylinder 3 is instantaneously broken. Work can be done comfortably.

The vacuum suction tweezers 1 according to the present embodiment is easy to operate because the grip 4 has a pencil shape. In addition, since the suction operation is performed by the push button 9 which can be operated by a finger, precision work is easily performed. Further, since the battery is of the electric type using only one dry battery 5, it is possible to reduce the burden on the finger. Moreover, since only one inexpensive dry battery 5 is used, a dedicated charger, adapter and dedicated spare battery are not required. In the present invention, a commercially available dry battery type rechargeable battery can also be used.

Further, since a combination of a piston-cylinder system and a gear device is adopted for the vacuum generating device, it is possible to sufficiently secure the suction force and the battery life by using a small commercial motor of 1.5V and a 1.5V dry battery. , Low price. In addition, the battery life is long, small and lightweight.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the hand-held vacuum suction tweezers 1 according to the present invention.
Indicates a state at the start point position. Since the vacuum suction tweezers 1 of this embodiment also has basically the same configuration as that of the first embodiment, the following mainly describes the differences between them.

In the vacuum suction tweezers 1 of this embodiment,
There is no spring 21 provided in the above embodiment. Further, the secondary gear 8 is disposed between the bearings 19 and 20 so as to be unable to move in the axial direction with respect to the primary gear 7. further,
The drive motor 6 is arranged so that its output shaft is directed toward the distal end, which is the opposite direction to that of the above embodiment. Along with this,
The secondary gear 8 is arranged adjacent to the proximal opening of the cylinder 3. And, on the base end side of the secondary gear 8,
The piston start point detection switch 15 and the piston end point detection switch 16E are arranged apart from each other in the axial direction.

The piston start point detection switch 15 is connected to the sensor dog 1 of the piston shaft 17 in the same manner as in the above embodiment.
7b is a limit switch for detecting that the piston 2 has returned to the initial position.

On the other hand, the piston end point detection switch 16E
Is the secondary gear position detection switch 16 in the above embodiment.
It is provided in place of the piston stopper 4b, and is a limit switch for detecting that the piston 3 has moved to the base end of the cylinder 3 by the sensor dog 17b and stopping the motor 6.

In this embodiment, although the stroke of the piston 2 is fixed, there is no problem in actual work. The operation stroke may be adjusted by moving the piston end point detection switch 16E in the axial direction.

FIGS. 6A and 6B are longitudinal sectional views showing a third embodiment of the hand-held vacuum suction forceps 1 of the present invention, wherein FIG. 6A shows a state where the piston 2 is at an intermediate position, and FIG. Indicates a state at an initial position, and (C) indicates a state at a predetermined vacuum position or a maximum stroke position.
Since the vacuum suction tweezers 1 of this embodiment also has basically the same configuration as that of the first embodiment, the following mainly describes the differences between them.

In this embodiment, in addition to the first spring 21A for urging the secondary gear 8 toward the proximal end, a second spring 21B for urging the secondary gear 8 toward the distal end is further provided. That is, between the bearing 19 on the distal end side and the secondary gear 8, the first spring 21 for biasing the secondary gear 8 to the proximal end side
While A is provided, a second spring 21B for urging the secondary gear 8 toward the distal end is provided between the bearing 20 on the proximal end side and the secondary gear 8. Each spring 21A, 21B
Are composed of compressed coil springs, and are respectively fitted to the piston shafts 17.

In place of the secondary gear position detection switch 16 and the piston start point detection switch 15 of the above embodiment,
The first detection switch 16A and the second detection switch
The detection switch 16B is arranged so that the gear body of the secondary gear 8 is sandwiched between the pins for detecting the limit position. In the illustrated example, the first detection switch 16 </ b> A is provided on the distal end side of the secondary gear 8, and the second detection switch 16 </ b> B is provided on the proximal end side of the secondary gear 8.

Then, for example, as shown in FIG. 6 (B), the secondary gear 8 moves toward the proximal end with respect to the primary gear 7 by advancing the piston 2 to the distal end of the cylinder 3 and making contact therewith. By moving and proceeding, the initial position is detected by the second detection switch 16B, and the motor 6 is stopped.

On the other hand, as shown in FIG. 6C, the piston 2 advances to the base end of the cylinder 3, the piston shaft 17 comes into contact with the piston stopper 4b, and the secondary gear 8 Moves to the front end side, and the maximum stroke position is detected by the first detection switch 16A, and the motor 6 is stopped. Similarly, even when the piston 2 is at the intermediate position with respect to the cylinder 3, if the inside of the cylinder 3 has a predetermined degree of vacuum or more, the piston 2 is pushed back to the front end side of the cylinder 3 so that the primary gear 7 , The secondary gear 8 moves to the front end side and advances, and the motor 6 is stopped by the first detection switch 16A.

[0053]

As described in detail above, according to the vacuum suction forceps of the present invention, it is inexpensive, has a long battery life, is compact,
It is lightweight, easy to operate, and can perform fine work easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a vacuum suction forceps according to the present invention, showing a state where a piston is at a starting point position.

FIG. 2 is a longitudinal sectional view showing the vacuum suction tweezers of FIG. 1, showing a state in which a piston is at a middle position of a cylinder.

FIG. 3 is a perspective view showing a main part of an internal structure of the vacuum suction forceps of FIG. 1;

FIG. 4 is a circuit diagram used for the vacuum suction forceps of FIG. 1;

FIG. 5 is a longitudinal sectional view showing a second embodiment of the vacuum suction tweezers of the present invention, showing a state where a piston is at a starting point position.

FIGS. 6A and 6B are longitudinal sectional views showing a main part of a third embodiment of the vacuum suction tweezers of the present invention, wherein FIG. 6A is a state in which a piston is at an intermediate position, FIG. (C) shows the case where the piston is in the maximum stroke position or a predetermined vacuum state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hand-held vacuum suction tweezers 2 Piston 3 Cylinder 4 Grip case 4a Partition wall 4b Piston stopper 5 Dry battery 6 Drive motor 7 Primary gear 8 Secondary gear 9 Push button 12 Branch air passage for vacuum breaking 13 Tube 14 Suction nozzle 15 Piston start point detection Switch 16 Secondary gear position detection switch 17 Piston shaft 17a Screw portion 17b Blade (sensor dog, rotation stop) 21, 21A First spring 21B Second spring

Claims (10)

[Claims] 1. A drive motor which rotates forward by an operation of an operator and reverses when the operation is released, a cylinder having a suction nozzle at a tip end thereof, and is fitted in the cylinder in an airtight state, and the length of the cylinder is adjusted. A piston that can move back and forth along the direction, a distal end side connected to the piston, a threaded portion formed on the outer peripheral surface on the proximal end side, and a piston shaft that can move in the axial direction with respect to the cylinder; The outer periphery is engaged with the primary gear of the output shaft of the drive motor so as to be rotatable. A secondary gear that moves the piston shaft to the distal end, and rotation of the drive motor is stopped by detecting that the piston has moved to the base end of the cylinder due to forward rotation of the drive motor. A hand-held vacuum, comprising: a piston end point detection switch for causing the piston to return to an initial position on the cylinder tip side by reverse rotation of the drive motor; and a piston start point detection switch for stopping rotation of the drive motor. Suction tweezers. 2. A drive motor which rotates forward by an operation of an operator and reverses by releasing the operation, a cylinder having a suction nozzle at a tip end thereof, and is fitted in the cylinder in an airtight state, and the length of the cylinder is reduced. A piston that can move back and forth along the direction, a distal end side connected to the piston, a threaded portion formed on the outer peripheral surface on the proximal end side, and a piston shaft that can move in the axial direction with respect to the cylinder; The outer periphery is engaged with the primary gear of the output shaft of the drive motor so as to be rotatable. A secondary gear that moves the piston shaft to the distal end and is slightly movable along the axial direction of the primary gear together with the piston shaft; and a first spring that biases the secondary gear toward the proximal end. When the inside of the cylinder becomes equal to or higher than a predetermined degree of vacuum, it detects that the secondary gear has moved to the distal end side with respect to the primary gear against the urging force of the first spring, and stops the drive motor. A hand-held vacuum, comprising: a next gear position detection switch; and a piston start point detection switch that stops rotation of the drive motor by detecting that the piston has returned to an initial position on the cylinder tip side due to reverse rotation of the drive motor. Suction tweezers. 3. The vacuum suction tweezers further includes a second spring for urging a secondary gear toward a tip end, and the piston start point detection switch is configured such that a piston and a piston shaft are initially set at a tip end side of a cylinder by a reverse rotation of a drive motor. By returning to the position and abutting against the tip of the cylinder, it detects that the secondary gear has moved proximally with respect to the primary gear against the urging force of the second spring, and stops the rotation of the drive motor. 3. The hand-held vacuum suction tweezers according to claim 2, wherein the tweezers are used. 4. The piston end point detection switch or the secondary gear position detection switch comprises a limit switch, and a pin or lever for detecting the limit position of the limit switch is a sensor dog protrudingly formed on the piston shaft.
The movement of the secondary gear is detected by being moved by one end surface in the axial direction of the secondary gear. The piston start point detection switch also includes a limit switch, and a pin or lever for detecting the limit position of the limit switch. Is a sensor dog protruding from the piston shaft,
The piston is returned to an initial position on the tip side of the cylinder by being moved by the other axial end surface of the secondary gear, thereby detecting that the piston has returned to the initial position. Hand-held vacuum suction tweezers. 5. The piston shaft is formed with two blades protruding therefrom. The blades are brought into contact with a side surface of a drive motor or the like,
The hand-held vacuum suction forceps according to claim 4, wherein the piston shaft is not rotatable, and at least one of the blades also functions as the sensor dog. 6. A piston stopper for contacting a base end of a piston shaft when the piston moves to a base end of a cylinder to prevent further movement of the piston shaft toward the base end. The hand-held vacuum suction tweezers according to any one of claims 2 to 5, wherein the tweezers are provided. 7. A vacuum breaking branch air passage for opening the inside of the cylinder to an external pressure is provided at a tip portion of the cylinder, and the vacuum breaking branch air passage is closed by the operation by an operator. The hand-held vacuum suction tweezers according to any one of claims 1 to 6, wherein the tweezers are opened by releasing the operation. 8. The operation of the operator is performed by pushing a push button, and the branch air passage for vacuum breaking is provided with a flexible tube, and the tube is elastically deformed by pushing the push button. By pressing down, the branch air passage for vacuum break is closed, while the deformed portion of the tube is restored by releasing the push button, whereby the branch air passage for vacuum break is opened. The hand-held vacuum suction tweezers according to claim 7. 9. The piston, the stopper and the driving mechanism thereof are housed in a pencil-shaped grip case,
The piston stopper is configured by a partition wall that partitions the inside of a grip case, and the tube is sandwiched and closed between a part of the push button and a side wall of the grip case when the push button is pressed. The hand-held vacuum suction forceps according to claim 8, characterized in that: 10. The hand-held vacuum suction tweezers according to claim 9, wherein the driving motor is driven by a dry battery built in the grip case.