JPS62282832A - Parts automatic clamping method and automatic clamping machine therefor - Google Patents

Abstract

PURPOSE:To make parts stably holdable in a catcher, by feeding these parts, with pressure, piece by piece from a parts feeder at every work cycle, and supplying air all the time when this part is held in the catcher. CONSTITUTION:When a signal for work starting is entered, a parts feeder 30 is set in motion, and only one piece of parts is fed, with pressure, to the inside of a feed hose 25 via air. Supply of this air is continued all the time when the part is held by a jaw 22 of a catcher 20, and successively this part is advanced forward while rotating a clamping member. With this constitution, the part goes forward as being supported by a clamping action member, thus the part is clamped to a work. If this operation is over, this clamping action member is returned to its original position, and when the next start signal is entered, the above-mentioned operation is repeated. Therefore, even in case of parts of a short screw being relatively leg long to a head diameter, a bolt or a nut, etc., stabilized holding is securable at all times.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is an automatic parts fastening machine for fastening parts such as screws, bolts, rivets, nuts, etc. to a workpiece, and in particular, This invention relates to an automatic parts fastening machine that prevents backflow of parts during fastening work from below.

(Prior Art) Conventionally, when parts such as screws, bolts, rivets, nuts, etc. are fastened to such places, a catcher 200 for holding these parts has been configured as shown in FIG. 3 or 4. .

What is shown in these figures is a catcher 20 that holds the screw 2.
For example, as shown in FIG.
a driver bit 110 that is rotatable and movable back and forth within the guide hole 10a of the nose 210;
The stop pawl 260 is elastically biased to protrude into the jaw 220 and prevents the screw 2 held by the jaw 220 from flowing backward. Then, in advance, when the screw 2 is supplied from a supply device (not shown) via air for each work cycle, the screw 2 is locked with the stop claw 260 to prevent it from flowing backward, and the screw 2 is held with the jaw 220. When the work start signal is input, the driver bit 110 moves forward while rotating to perform the screw tightening work, and when the work end signal is received, the screw 2 is force-fed from the supply device and held by the jaw 220, and one work cycle is completed. It ends.

In addition, the catcher 200 shown in FIG. 4 has a pair of jaws 220 that hold the screw 2 at their tips, each equipped with a blocking claw 270 whose tips protrude elastically inward and grasp the screw 2 that is force-fed from the feeding device. With this, after the screw 2 is held so as not to flow backward, the driver bit 110 prevents the jaw 220 from opening until the screw 2 is fitted into the driver bit 110.

As in the conventional example, a signal to start work is input in advance while the screw 2 is held, and the same work cycle as described above is performed.

[Problem that the invention seeks to solve]

However, in an automatic parts fastening machine that has a catcher with such a structure and a control circuit that performs such a work cycle, the parts are already pressure-fed from the parts supply device and held in the catcher before the start of work. At the beginning of the work, the parts are often not held correctly in the catcher and are tilted, so the operator has to check whether the parts are held correctly in the catcher before starting work. FK each time
I needed to acknowledge it.

In addition, especially for parts such as screws, bolts, rivets, or nuts whose leg length is relatively short compared to the head diameter, if a stop claw or blocking claw is used, mistakes may occur when holding these parts in the catcher. This is likely to occur, resulting in problems such as the parts fastening work becoming unstable and lacking in reliability.

(Means for Solving the Problems) The present invention was invented for the purpose of solving the above-mentioned problems and providing a method and machine for automatically fastening parts that are reliable in operation and simple in structure. In this method, when a start signal is input, the parts are fed one by one from the parts supply device 30 for each work cycle, and air is supplied while the parts being fed under pressure are held in the catcher 20.
Subsequently, the parts held by the catcher 20 are fastened to the workpiece using a fastening member,
On the other hand, a machine that implements this method is equipped with a parts supply device 30 that pumps parts through air every work cycle.
Supply hose 2 whose one end is connected to this component supply device 30
A catcher 20 that holds the component is connected to the other end of the component 5, and a fastening member that applies power to the component is inserted into the catcher 20 so as to be movable back and forth. An air control circuit is provided which supplies air at least while the catcher 20 is holding the part by force and moves the fastening action member forward after a predetermined period of time has elapsed.

[Effect]

When a signal to start work is received, the parts supply device 30 operates,
Only one component is pumped through the supply hose 25 via air. This air is supplied while the component is held by the jaws 22 of the catcher 20, and then the fastening member is rotated and advanced. As a result, the part moves forward while being supported by the fastening member, and the part is fastened to the workpiece. Once this work is complete,
The fastening member returns to its original position, and when the next start signal is received,
The above operations are repeated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In Figure 1, 1 inserts the screw 2 from below into the workpiece (
This screw fastening unit 1 is fixed to a fixing plate 3 fixed to a base (not shown). A piston cylinder 4 for moving the screw tightening unit 1 up and down is fixed to this fixed plate 3, and a piston rod 4a of this piston cylinder 4 is connected to a member 5 for attachment. A first stopper 6 prevents the piston rod 4a from moving forward. Also,
For installation, the member 5 is a support member 7a fixed to the fixed plate 3.
, 7b, and are slidably disposed on a pair of guide shafts 8 which are disposed parallel to each other in the vertical direction and whose both ends are fixed. For this attachment, a case 10 containing a drive source (not shown) for the screw tightening unit 1 is fixed to the rear of the member 5, and a driver bit 11 is connected to the tip of the drive source.

In addition, a sleeve 12 that is extendable and retractable is inserted into the case 10, and a spring 13 is built into the sleeve 12 around the driver bit 11 to elastically bias the driver bit 11 forward at all times. .

Furthermore, a suction pipe 14 containing the driver bit 11 in a rotatable and movable manner is connected to the tip of the sleeve 12, and a nose 21 forming the killature 20 is formed at the tip of the suction pipe 14. guide hole 21a
It is inserted so that it can move freely for 1 m.

A pair of jaws 22 are attached to the tip of the nose 21, the tips of which are opposed to each other with the center line in between, and which are always elastically biased so that the tips are closed. This nose 21 is fixed to the tip of the guide $18 via a nose guide 23, and this nose guide 23 is connected to a second stopper 2 that prevents the sleeve 12 from moving forward at a predetermined position.
4 is attached so that it can be adjusted freely. On the other hand, the nose 2
1 has a supply hole 2 that intersects with the guide hole 21a in a 7-shape.
1b is formed, and a supply hose 25 through which the screw 2 is supplied is connected to this supply hole 21b.

At the other end of this supply hose 25, screws 2, which are scooped up by a scooping plate 32 from a supply hopper 31 of a parts supply device 30 and arranged and supplied on a chute 33, are separated and supplied one by one for each work cycle. It is connected to the supply unit 34.

Furthermore, FIG. 2 shows an air control circuit that controls the operation timing of this automatic screw tightening machine, in which air supplied from an air source 40 passes through an air pressure adjustment unit 41 and is passed through a first solenoid valve 42. It is connected to the piston cylinder 43 of the separate supply unit 34 of the component supply device 30. Further, the side to which the first electromagnetic valve 42 is connected is branched and connected to a supply hose 25 that guides the screw 2 from the separation supply units 1 to 34 to the catcher 20. On the other hand, suction units 1 to 44 that suck air from the tip of the suction pipe 14 are connected between the air pressure adjustment unit 41 and the first electromagnetic valve 42 . This suction unit 44 is set to suck air from the tip of the suction pipe 14 for a predetermined period of time by a separately provided control unit (not shown).

Furthermore, the air pressure adjustment unit 41 includes a second solenoid valve 4.
The second electromagnetic valve 45 is connected to a piston cylinder 4 that moves the screw tightening unit 1 up and down.

Next, the operation of this embodiment will be explained. A large amount of screws 2 are stored in advance in the supply hopper 31 of the parts supply device 30.
When a start signal is input from the state in which the materials are arranged and supplied onto the chute 33, one by one is supplied into the supply hose 25 from the screw 2 at the tip of the chute 33 by the separate supply unit 34 for each work cycle. Subsequently, air is supplied from the air source 40 into the supply hose 25, and the screw 2 is forced into the supply hose 25 and enters the catcher 20, and as shown in FIG. Retained. At this time, this air continues to flow for a predetermined period of time, that is, at least the second solenoid valve 45 is activated, the screw tightening unit 1 is raised, the suction pipe 14 is raised while performing a suction action, and the screw 2 is The liquid is supplied until it is adsorbed and held by this suction pipe 14. In this embodiment, the air is supplied until the screw is suctioned and held by the suction pipe, but the air may be supplied until the screw is completely tightened.

When the screw 2 is held in the suction pipe 14 in this way, the first electromagnetic valve 42 is operated to stop the air supply and the separation supply unit 34 returns to its original state. On the other hand, even after the screw tightening unit 1 holds the screw 2 in the suction pipe 14, it rises together with the driver bit 11, and the catcher 20 rises just before the catcher 20 comes into contact with a workpiece (not shown). stop. After this, the driver bit 11 continues to rotate and move up to start screwing. Moreover, at the same time, the suction action of the air is stopped, so there is no suction of dust during screwing. In this way, the screw 2 is screwed into the workpiece, and the screw tightening work is completed.

In this embodiment, the screw 2 is held by suction on the suction pipe 14, and the screw 2 is screwed into the workpiece using the driver bit 11 inside the suction pipe 14, but the invention is not limited to this. For example, the fastening member composed of the pipe 14 and the driver bit 11 may be one in which the screw 2 held by the catcher 20 is directly screwed into the work by the driver bit 11.

Furthermore, although this embodiment has been described for screw tightening work, it can also be used for rivet caulking, pin press-fitting work, etc. .

(Effects of the Invention) As is clear from the embodiments described above, the present invention has parts arranged so that when a start signal is input, parts such as screws, bolts, rivets, nuts, etc. are force-fed one by one during the work cycle. Air is supplied through the supply hose 25 connected to the supply device 30, and the air used for this supply operation is supplied to the screw 2.
This is a method and device in which an air control circuit is arranged so that air is fed under pressure while the catcher 2G is holding the workpiece, and the parts held in the catcher 2G are fastened to the workpiece by a fastening member.

In this way, in each work cycle, the parts are quickly supplied to the catcher, and the air used for this is continuously supplied to detect the backflow of the parts, so that the parts are It is stably and correctly held in the V-shaped structure, and there is no possibility of tilting. This makes it difficult for the Ministry of Works to check whether the parts are correctly held in place before work begins. Also,
Particularly, even parts such as screws, bolts, nuts, etc. whose leg length is relatively short compared to the head diameter can be stably held at all times. Furthermore, since there is no longer a need for stoppers or blocking claws to hold parts in the catcher and prevent backflow as in the past, the number of parts is reduced and the catcher as a whole becomes more compact. It will be done.

[Brief explanation of the drawing]

) Figure 1 is a sectional front view of essential parts showing an embodiment of the present invention, Figure 2 is an air control circuit diagram of this embodiment, Figure 3 is a sectional view of essential parts showing a conventional example, and Figure 4 is a diagram of a pond. FIG. 2 is a cross-sectional view of a main part without showing a conventional example. 1 is a screw tightening unit 1 to 1, 2 is a screw, 3 is a fixing plate, 4 is a piston cylinder, 4a is a piston rod, 5 is a mounting member, i 6 is a first collar, 7a, 7b are supporting members , 8 is the guide shaft, 1 10 is the case, 11 is the driver bit,
12 is a sleeve, 13 is a spring, 14 is a suction pipe, 2o is a catcher, 21 is a nose, 21a is a guide hole, 21b is a supply hole, 22 is a jaw, 2
3 is a nose guide, 24 is a second stopper, 25 is a supply hose, 30 is a parts supply device, 31 is a supply hopper,
32 is a scooping plate, 33 is a chute, 34 is a separation supply unit, 40 is an air source, 41 is an air pressure adjustment unit,

Claims (1)

[Claims] 1) When a start signal is input, the parts are fed from the parts supply device 30 one by one in each work cycle, and air is supplied while the parts that have been fed under pressure are held in the catcher 20. An automatic parts fastening method characterized in that: and then, the parts held by the catcher 20 are fastened to the workpiece using a fastening member. 2) A parts supply device 30 that pumps parts through air every work cycle is arranged, and a supply hose 2 with one end connected to this parts supply device 30.
A catcher 20 that holds the pressure-fed parts is connected to the other end of the 5, and a fastening member that applies power to the parts is inserted into the catcher 20 so as to be movable back and forth. An air control circuit is disposed that supplies air at least while the catcher 20 holds the component after the component is force-fed from the supply device 30, and operates to advance the fastening member after a predetermined period of time has elapsed. An automatic parts fastening machine characterized by: