JP2865014B2 - Automatic assembly station with automatic screw tightening system and screw tightening hand tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic assembling station provided with an automatic hand changing device (hereinafter, AHC), and more particularly to an automatic screw tightening system using AHC.

[0002]

BACKGROUND OF THE INVENTION Automatic screw tightening devices are generally classified into a pressure feeding system, a pick-and-place system, and a system directly connected to a parts feeder according to a method of supplying a screw.

An example of the screw pressure feeding method is introduced as "Precision Screw Tightening Robot SR320S" in "Automation Technology" magazine (1991, Vol. 23, No. 1, pp. 63-71). This robot has a configuration in which a screw pressure feeding unit incorporating a parts feeder and an automatic screw tightening machine are connected by a screw supply hose. The screw feed unit cuts out the screws supplied from the parts feeder one by one,
They are pumped by means of compressed air through a screw supply hose to a screwdriver. The screw fed by pressure is taken into the catcher of the screw tightening machine, and a vertical driving device such as an air cylinder operates while the screw is held by the catcher, so that the entire screw tightening machine descends. When the screw tightening machine descends to a predetermined position, the bit of the screw tightening machine further descends and engages with the screw head, and the screw is tightened by rotating the bit. When the screw tightening is completed, the screw tightening machine is raised to a predetermined position, and a series of automatic screw tightening operations is completed.

[0004] As a method of holding the screw in the catcher, a chuck claw method in which the screw is tightened while the screw is held in the chuck, and a method in which the suction pipe containing the screw tightening bit is evacuated to make the bit smaller. There is known a vacuum method in which a screw is attracted to tighten a screw. In general, a vacuum system in which the restriction on the dead space of the work target is moderate is often used.

In this screw pressure feeding system, not only the screw pressure feeding unit but also a fine design is made so that the screw does not fall or clog in the hose, and the catcher at the tip of the screw tightener obtains the required posture of the screw. Is required,
Also, the bit of the screw tightening machine needs to be adapted to the nominal diameter of the screw to be applied and the shape of the fitting groove, and as a result, everything from the parts feeder to the screw tightening machine is configured exclusively for the screw used.

Next, the pick-and-place method is for a screw to which the above-mentioned pressure feeding method cannot be applied. That is, the pick-and-place method is applied to a screw in which the entire length of the screw is smaller than the screw head diameter and the screw cannot be transported due to overturning or clogging in the screw feeding hose. This method consists of a parts feeder that supplies and arranges screws one by one, a screw tightener with a suction pipe supported by a spring so that it can slide in the axial direction of the screw tightener, and a workpiece that tightens the parts feeder and screws. And a robot-type screw tightening device that has a within its operating range. First, the screw tightening device moves the screw tightening machine right above the first screw aligned and supplied from the parts feeder and lowers the screw vertically.
Then, the screw is sucked to the head of the suction pipe by operating the vacuum suction device, and the screw tightening machine is moved to a predetermined position on the workpiece and lowered to perform automatic screw tightening. This method has a drawback that the work tact time is slower than the pressure feeding method, but is effective for screws that cannot be pressure fed.
Also in this method, the parts feeder and the screw tightening machine are configured for exclusive use of the screw used.

[0007] Finally, as a method of improving the work tact time of the pick-and-place method, there is a part feeder direct connection method. One such example is introduced as “Precision Screw Tightening Robot SR320F” in the aforementioned “Automation Technology” magazine. In this robot, a parts feeder is mechanically connected and fixed to a screw tightening machine, and a screw is directly supplied from the parts feeder to the screw tightening machine to perform screw tightening. Although this method improves work tact time, when tightening screws at multiple points of the work object with this method,
It is necessary to mount a screw tightener and a parts feeder on the leading end of the robot, which has a disadvantage that the load on the robot increases and miniaturization becomes difficult. Also in this method, the parts feeder and the screw tightening machine are configured for exclusive use of the screw to be applied, similarly to the above-mentioned method.

As described above, a commercially available automatic screw tightening apparatus generally has a screw head shape specified in advance.
Only a screw with a specific nominal diameter and a fixed length could be handled. In addition, in order to perform multiple types of screw tightening with one screw tightening machine, it was necessary to replace parts such as bits, parts feeders, catchers, etc. of the screw tightening machine, even with specially considered equipment. .

[0009]

2. Description of the Related Art Various automatic screw tightening apparatuses which can handle a plurality of types of screws have been proposed. 1-11
In the screw supply switching device disclosed in Japanese Patent No. 5623, a plurality of types of screws can be supplied by connecting a plurality of feeder hoses on the circumference of a fixed substrate and selecting one feeder hose by a rotating member. ing. In the screw tightening machine disclosed in Japanese Patent Application Laid-Open No. 57-39411, a plurality of screw tightening heads are mounted on an arm, and a screw tightening head to be operated according to the type of screw is selected.

[0010]

However, in the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 1-115623, the feeder hose on the screw tightening machine side is a fixed type of hose, so that the screw fed by pressure is used. If the screw head diameter d is larger than the inner diameter of the feeder hose, the screws cannot be fed by pressure. Further, in order for the screw to be transported in a required direction without falling down in the hose, the length of the screw with respect to the inner diameter of the hose needs to be a certain value or more. Therefore, the types of screws that can be applied are limited depending on the screw supply hose used. In addition, the screw tightening machine at the end of the screw supply hose is obviously fixed, and the screw tightening bit of the screw tightening machine is of a type that fits the shape of the predetermined screw head, such as a cross hole, a slot, or a hexagonal hole. And other than those of size can not be used.

Further, in the screw tightening machine disclosed in Japanese Patent Application Laid-Open No. 57-39411, a plurality of types of screw tightening heads are mounted on the tip of the robot arm. There is a problem that the weight increases and the driving mechanism of the arm becomes large. In addition, mounting a large number of screw tightening heads requires an extra control mechanism for positioning each head, resulting in an increase in complexity and size of the apparatus.

In general, when an automatic assembly line is constructed, a screw tightening station can often handle only a specific screw in many cases. It needed to be modified or renewed. In addition, automatic screw tightening machines are often purchased from specialized manufacturers and used, so they tend to be dedicated stations.When changing the order of the screw tightening process in the assembly process, move the automatic screw tightening station itself or They need to be replaced.

An object of the present invention is to provide an automatic screw tightening system which can easily cope with various kinds of screws.

Another object of the present invention is to provide an automatic assembly station having an automatic screw tightening system capable of constructing a flexible automatic assembly line capable of easily responding to changes in the automatic assembly line.

[0015]

An automatic assembling station according to the present invention includes an AHC for selecting and removing a desired hand tool from a plurality of hand tools placed at predetermined positions, and the AHC includes a plurality of types of screws. It has a screw supply unit for supplying one screw for each type in a predetermined positional relationship, and the plurality of hand tools include a plurality of screw tightening hand tools respectively corresponding to each type of screw.

Each of the plurality of screw tightening hand tools is mounted on the AHC while the screw tightening hand tools are mounted on the AHC.
A screw receiving unit that receives any one of the screws supplied from the screw supply unit, a catcher that holds the screw received by the screw receiving unit at a predetermined position, and a screw tightening machine that screws the screw held by the catcher When,
Consists of

[0017]

A plurality of screw tightening hand tools are prepared in advance as AHC hand tools. The screw receiving portion, catcher, and screw tightening device of the screw tightening hand tool are set so as to be compatible with the type of screws handled by the screw tightening hand tool. The AHC selects and mounts a screw tightening hand tool according to the type of screw used in the automatic assembly station, and performs a predetermined screw tightening operation on a workpiece using the tool.

[0018]

FIG. 1 is a perspective view showing an automatic assembling unit equipped with an embodiment of a screw tightening system according to the present invention. The automatic assembling unit 10 is one station constituting an automatic assembling line for a certain product, and the necessary number of conveyors 101 provided in front of the unit 10 are arranged in a continuous manner to form an automatic assembling line for a certain product. Is configured.

The automatic assembly unit 10 includes a conveyor 10
1 is provided with an orthogonal portal robot 102, and a tray supply conveyor 1 is provided below the orthogonal portal robot 102.
03 is provided. The tray supply conveyor 103 is
Conveying, positioning, and component trays with components to be assembled
And discharge the empty tray to the rear. Further, a tray supply device 104 for supplying component trays and collecting empty trays is provided behind the tray supply conveyor 103.

The arm 201 of the orthogonal portal robot 102 is freely movable in the X and Y directions.
An actuator 202 is attached to the end of the arm 201, and the actuator 202 is moved in the Z-axis direction (vertical direction) by a Z-axis driving device built in the arm 201. The actuator 202 has four types of feeder hoses 204a.
Through 204d are connected to the screw pressure feeding devices 105a to 105d, respectively. Screw pressure feeding devices 105a-10
In 5d, four types of screws are stored in advance, and as described above, the corresponding types of screws are passed through the respective feeder hoses by the compressed air and the actuators 202 are driven.
Supplied to

Below the orthogonal gate type robot 102, a hand placing table 106 is arranged alongside the tray supply conveyor 103.
Is provided, and a hand rest 107 is also provided in front of the conveyor 101. A plurality of component assembling hand tools required for the work performed in the station or an automatic screw tightening hand tool for performing a screw tightening operation are arranged on these hand tables. In this embodiment, it is assumed that four types of screw tightening hand tools are placed on the hand placing table 106.

The schematic operation of the automatic assembly unit 10 having such a configuration will be described. In accordance with an instruction from a line controller (not shown) for controlling the entire automatic assembly line, the orthogonal portal robot 102 selects and mounts an assembly hand tool or a screw tightening hand tool that matches the work content, and the conveyor 101 from the upstream station. A predetermined assembling process is performed on the conveyed workpiece. When this assembling is completed, the work object is sent out to a downstream station by the conveyor 101.

[0023] Orthogonal gantry robot Figure 2 is a schematic partial sectional side view of the orthogonal gantry robot 102 selected fitted one screwing hand tools. In the figure, the arm 2 of the orthogonal gate type robot 102 is shown.
01 is provided with an actuator 202, and an AHC
A master 203 is attached. Actuator 2
Numeral 02 moves up and down by the Z-axis driving device in the arm 201, and the AHC master 203 rotates and attaches / detaches the hand tool by the actuator 202. That is, the arm 201 moves to the designated hand rest 106,
Select and install the specified screw tightening hand tool 301,
Conveyor 10 using the screw tightening hand tool 301
A predetermined screw tightening operation is performed on the work object 401 conveyed by 1.

The four types of screws are respectively connected to the feeder hose 2
04a-204d, but in practice one type of screw specified by the line controller is supplied through the corresponding feeder hose. One screw tightening hand tool 30
1 is configured to accept only one type of screw. The orthogonal portal robot 102 selectively mounts the screw tightening hand tool corresponding to the type of the supplied screw to the AHC master 203 according to the instruction of the line controller.

FIG. 3 is a detailed side view of the AHC hand unit in FIG. The AHC master 203 provided at the tip of the actuator 202 includes a screw tightening hand tool 301.
AH tool detachable joint with AHC tool joint 302
Base plate 30 to which C tool joint 302 is fixed
A screwing machine 304 is attached to 3 by a structure described later. A catcher 305 is provided at the tip of the screw tightening machine 304, and captures a screw that has been fed through a feeder hose. Hereinafter, the configurations of the actuator on the AHC master side and the screw tool on the AHC tool side will be described in detail.

Actuator FIG. 4 is a front view showing the structure of the actuator on the AHC master side in FIG. The actuator 202 is fixed to a base plate 205, and an AHC master 203 is attached thereto via a rotatable Z-axis shaft 209. The support plates 206 and 2 connected to the base plate 205 are provided on both sides of the actuator 202.
07 are fixed, the support plate 206 has feeder hose connections 208a and 208b, and the support plate 207 has feeder hose connections 208c and 208c.
d are arranged respectively. Feeder hoses 204a to 204d are respectively attached to the feeder hose connection portions 208a to 208d.

The actuator 20 configured as described above
2 is provided at the tip of the arm 201 of the orthogonal portal robot 102, and moves in the Z-axis direction. Actuator 2
In No. 02, the hand tool joined to the AHC master 203 can be freely rotated and positioned by rotating the Z-axis shaft 209.

The screw fastening hand tool Figure 5 is a front view of the screw fastening hand tool 301 in FIG. 3, FIG. 6 is a plan view, FIG. 7 is a side view thereof.

As shown in FIGS. 5 and 6, at both ends of the base plate 303 of the screw tightening hand tool 301, support plates 306 are provided by support columns 310a and 310b.
However, the support plate 307 is supported by the support columns 310c and 310d, respectively. In the screw tightening hand tool 301, the support plate 306 has the screw receiving portion 3
08a, the screw receiving portions 308c and 308d are arranged on the support plate 307, respectively. Of course, only one required screw receiving portion may be provided, or all the screw receiving portions 308a to 308d may be provided.

The positional relationship between the screw receiving portions 308a to 308d depends on the feeder hose connecting portion 20 of the actuator 202.
8a to 208d. Therefore, AHC
By mounting the screw tightening hand tool 301 on the master 203, as shown in FIG.
8a to 208d screw discharge ports and screw receiving portions 308a to 308
08d can be overlapped with the screw receiving port.

As shown in FIGS. 6 and 7, in this screw tightening hand tool 301, only the screw receiving portion 308c passes through the transfer hose 309 and the screw input port 3 of the catcher 305 is used.
13 is connected. Since the screw receiving portion 308c corresponds to the feeder hose connection portion 208c on the AHC master side, a screw of the type fed under pressure by the feeder hose 204c is inserted into the screw input port 313 through the screw receiving portion 308c and the transfer hose 309.

As shown in FIG. 5, two linear guides 311a and 311b are fixed to the base plate 303, and guide shafts 312a and 312b penetrating therethrough are fixed to the plate 315. The guide shafts 312a and 312b are urged by springs 314a and 314b to
Since the screwing machine 304 penetrates through 11a and 311b, it is guided by a linear guide and is attached to the base plate 303 in a floating state by springs 314a and 314b.

The screw tightening hand tool 301 of the present embodiment
Has four types of screw receiving portions 308a to 308d, and thus can handle four types of screws. For example, as shown in FIG. 7, a screw tightening machine 304c, a catcher 305c
If the transfer hose 309c is connected to the screw receiving portion 308c using the screw input port 313c, the feeder hose 20
4c is a screw tightening hand tool 301c for handling screws of a type fed by pressure. Similarly, as shown in FIG. 8, if the transfer hose 309d is connected to the screw receiving portion 308d,
The screw tightening hand tool 301d handles a screw of a type fed by the feeder hose 204d. Of course, the catcher 305 and the screw slot 313 can be shared depending on the type of screw.

Specific Operation Examples Hereinafter, as specific examples, the screws to be used are pan-head small screws, the feeder hose 204a is for the nominal diameter M1.4, the feeder hose 204b is for the nominal diameter M2, and the feeder hose 2 is
04c is for nominal diameter 2.6 and feeder hose 20
4d is for nominal diameter M3. In response to these,
Screw tightening machines 304a-304d of screw tightening hand tools 301a-301d, feeder hose connection portions 208a-
208d, screw receiving portions 308a to 308d, transfer hoses 309a to 309d, catchers 305a to 305d,
The screw input ports 313a to 313d are also set to be suitable for each screw type. For example, in the case of a screw with a nominal diameter of M1.4, the bit of the screw tightening machine 304a is set to the JCIS-8-
The # 0 (S) type specified in No. 70 is used, and the transfer hose 309a is connected to the screw receiving portion 308a. Similarly,
In the case of a screw with a nominal diameter of M2, the bit of the screw tightening machine 304b uses the # 0 (H) type specified in JIS-B1111 and the transfer hose 309b is connected to the screw receiving portion 308b. In the case of a screw with a nominal diameter of M2.6, a screw tightening machine 30
4c bit # 1 specified in JIS-B1111
(H) type is used, and the transfer hose 309c is connected to the screw receiving portion 308c. In the case of a screw with a nominal diameter of M3, the bit of the screw tightening machine 304d is set to the bit of JIS-B1111.
# 1 (H) type specified in
9d is connected to the screw receiving portion 308d.

FIG. 9 is a schematic plan view of the automatic assembly unit 10 for explaining the operation of the orthogonal portal robot 102. As shown in the figure, four types of set screw tightening hand tools 301 a to 301 d are arranged at predetermined positions of the hand placing table 106.

The case where the automatic assembling unit 10 executes the screw tightening process of the nominal diameter M1.4 according to the instruction of the line controller will be described. First, the orthogonal gate type robot 102
Operates the screw tightening hand tool 301a corresponding to M1.4 by the command of the line controller.
2 is attached to the AHC master 203. At this time, the AHC master 203 is joined at a predetermined position of the AHC tool joining portion 302, and is arranged at the feeder hose connection portions 208a to 208d arranged on the master side support plates 206 and 207 and the tool side support plates 306 and 307. The screw receiving portions 308a to 308d are positioned so as to coincide with and overlap with each other.

Subsequently, the orthogonal portal robot 102 transmits a screw pressure feeding instruction to the screw pressure feeding device 105a through a control cable (not shown). In response to the pumping instruction, the screw pumping device 105a inserts the M1.4 screw into the feeder hose 20.
4a to the actuator 202. The screw fed through the feeder hose 204a is fed into the screw input port 313a through the feeder hose connection part 208a arranged on the master side support plate 206, the screw receiving part 308a arranged on the tool side support plate 306, and the transfer hose 309a. Then, it is held in a predetermined posture in the catcher 305a. Then, as described later, automatic screw tightening is performed by a bit of the screw tightening machine 304a.

The same applies to the case of performing the screw tightening step of the nominal diameter M2. First, the orthogonal portal robot 102 positions the M2 compatible screw tightening hand tool 301b and mounts it on the AHC master 203 according to a command from the line controller. Subsequently, the orthogonal portal robot 102 transmits a screw pressure feeding instruction to the screw pressure feeding device 105b, and the screw pressure feeding device 10b
5b to M2 screws are received through feeder hose 204b. Then, the screw is inserted into the screw input port 313b through the transfer hose 309b, held in a predetermined position in the catcher 305b, and automatic screw tightening is performed by a bit of the screw tightening machine 304b.

Similarly, when performing the screw tightening process for the nominal diameters M2.6 and M3, the orthogonal portal robot 102 also mounts the screw tightening hand tools 301c and 301d, respectively, and sets the screws from the screw pressure feeding devices 105c and 105d. Automatic screw tightening is performed when supplied.

Screw Tightening Mechanism FIG. 10 is a schematic sectional view of a screw tightening machine according to this embodiment. Screw tightening bit 316 is suction pipe 317
The bit 316 and the suction pipe 317 can be moved in the Z direction (vertical direction) with respect to the screw tightening machine 304 by a driving device (not shown) in the screw tightening machine 304. The suction pipe 317 can suck the screw by sucking air. Screw inlet 3
The screw inserted from 13 is held by the catcher 305 with the screw head facing the bit 316, and the screw is tightened as described below.

FIGS. 11A to 11C are schematic sectional views showing the screw tightening operation of the screw tightening machine in the present embodiment. As shown in FIG.
When 1 is held by the catcher 305, the bit 316 and the suction pipe 317 are lowered, and the screw 501 is sucked by the suction pipe 317. As a result, FIG.
As shown in (B), the screw 501 is sucked into the suction pipe 317, and the groove of the screw head and the bit 316 are fitted.
Subsequently, the bit 31 is inserted with the screw 501 fitted and sucked.
6 and the suction pipe 317 further descend and protrude from the catcher 305 as shown in FIG. In this state, as shown in FIG. 2, the work target 401 is lowered to the screw fixing position, and the bit 316 is rotated with a predetermined torque to perform automatic screw tightening.

Although this screw tightening hand tool uses a vacuum type catcher, the suction pipe 31
7 and the screw tightening bit 316 can take two positions relative to the catcher 305 as shown in FIGS. Thereby, the screw tightening hand tool according to the present embodiment can feed the screw as described above to perform automatic screw tightening, and can perform the automatic screw tightening.
By performing vacuum suction of the suction pipe 317 at the position 1 (C), it is possible to perform screw tightening of the pick-and-place method.

Although the screw tightening hand tool uses a vacuum type catcher, the vertical movement of the screw tightening hand tool 301 is performed by a driving mechanism built in the arm 201 of the orthogonal gate type robot 102.
Therefore, the hand tool is vertically moved by the same drive mechanism as when the assembling hand tool is mounted.

As described above, the screw pressure feeding device and the feeder hose suitable for the screw to be applied in advance are provided in the automatic assembling unit, and the screw tightening hand tool for the screw to be applied is arranged on the hand rest, and the AHC device is set. , It is possible to handle a plurality of types of screws that cannot share the bit and tightening torque of the screw tightener 301, the inner diameter of the feeder hose 204, the shape of the catcher 305, and the like in one station. .

By setting the AHC-related dimensions of the assembling hand tool to be the same as those of the screw tightening hand tool, the assembling hand tool and the screw tightening hand tool can be selectively used by using the same AHC device. As a result, assembly of parts and automatic screw tightening of a plurality of types become possible.

[0046]

As described above, the automatic assembling station having the automatic screw tightening system according to the present invention has the following features.
A plurality of screw tightening hand tools are prepared in advance as HC hand tools, and a screw receiving portion, a catcher, and a screw tightening machine of these screw tightening hand tools are set so as to be suitable for the type of screw. The AHC selects and mounts a screw tightening hand tool according to the type of screw used in the automatic assembling station, and executes a predetermined screw tightening operation on the workpiece using the hand tool.

By preparing a screw tightening hand tool corresponding to a plurality of types of screws, it is possible to provide an automatic screw tightening system capable of easily coping with various types of screws. In addition, a flexible automatic assembly line can be constructed because the automatic assembly line can be easily changed by simply changing the screw tightening hand tool to another assembly hand tool.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an automatic assembly unit equipped with one embodiment of a screw fastening system according to the present invention.

FIG. 2 is a schematic partially cutaway side view of the orthogonal portal robot 102 to which one screw tightening hand tool is selectively mounted.

FIG. 3 is a detailed side view of an AHC hand unit in FIG. 2;

FIG. 4 is a front view showing a configuration of an actuator on the AHC master side in FIG. 3;

FIG. 5 is a front view of the screw tightening hand tool in FIG. 3;

FIG. 6 is a plan view of the screw tightening hand tool in FIG. 3;

FIG. 7 is a side view of the screw tightening hand tool in FIG. 3;

FIG. 8 is a side view of a screw tightening hand tool for handling different kinds of screws.

FIG. 9 is a schematic plan view of the automatic assembly unit 10 for explaining the operation of the orthogonal portal robot 102.

FIG. 10 is a schematic cross-sectional configuration diagram of a screw tightening machine in the present embodiment.

FIGS. 11A to 11C are schematic cross-sectional configuration diagrams illustrating a screw tightening operation of the screw tightening machine in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automatic assembly unit 101 Conveyor 102 Orthogonal gate type robot 103 Tray supply conveyor 104 Tray supply device 105a-105d Screw feeding device 106 Hand placing table 107 Hand placing table 201 Arm 202 Actuator 203 AHC master 204a-204d Feeder hose 205 Base plate 206 Support plate 207 Support plate 208a to 208d Feeder hose connection portion 209 Z axis shaft 301 Screw tightening hand tool 302 AHC tool joint 303 Base plate 304 Screw tightener 305 Catcher 306 Support plate 307 Support plate 308a to 308d Screw receiving portion 309a to 309d Transfer hose 310a ~ 310d Support column 311a Linear guide 311b Linear guide 312a Guy Shaft 312b guide shaft 313 threaded inlet 314a spring 314b spring 315 plate 401 work object

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23P 19/06 B25B 23/04 B25B 23/02

Claims (6)

(57) [Claims] 1. An automatic hand changing device (hereinafter referred to as AHC) capable of selecting a desired screw tightening hand tool from a plurality of screw tightening hand tools placed at a predetermined position and detachably mounting the same.
That. ), The AHC includes screw supply means for supplying a plurality of types of screws one by one in a predetermined positional relationship for each type, and each of the plurality of screw tightening hand tools A screw receiving unit that faces the screw supply unit in a state where the screw tightening hand tool is mounted on the AHC, and that receives a predetermined type of screw supplied from the screw supply unit; An automatic screw tightening system comprising: an automatic screw tightening system, comprising: screw holding means for holding the received screw at a predetermined position; and screw tightening means for screwing the screw held by the screw holding means. Assembly station. 2. The screw supply means, wherein the screw transport means transports the plurality of types of screws one by one for each type, and wherein the predetermined position is connected to the screw transport means, and the predetermined position is provided for each type of screw. The automatic assembly station according to claim 1, further comprising: a plurality of screw outlets for discharging the screw in a relationship. 3. The screw transport means is provided corresponding to each of the plurality of screw pressure feeding devices, the plurality of screw pressure feeding devices for transporting the plurality of types of screws one by one by compressed air, and the plurality of screw pressure feeding devices, respectively.
The automatic assembling station according to claim 2, comprising: a plurality of transport hoses for transporting the screws sent from the screw pumping device. 4. The screw tightening hand tool according to claim 1, further comprising a screw transfer unit that connects the screw receiving unit and the screw holding unit. 5. The screw tightening hand tool according to claim 1, wherein the screw receiving unit has a positional relationship corresponding to the predetermined positional relationship of the screw supplying unit and corresponds to the type of the screw. A screw tightening hand tool comprising a plurality of screw receiving ports. 6. The screw tightening hand tool according to claim 5, further comprising a screw transfer unit that connects one of the plurality of screw receiving ports to the screw holding unit.