JPH06134629A - Crew member assembling device - Google Patents

Abstract

PURPOSE:To completely automate an assembling process for intentions such as the reduction of working man-hour, the improvement of the accuracy of an assembly finished product, and the lowering of an inferior rate by subdividing a guide roller assembly process and clasifying it into many single purposes, and introducing an automatic screwing device suitable for the above simple work. CONSTITUTION:A screw member assembling device is provided with a working table 10 where a previously tapped base work 32 is positioned and fixed by a fixing jig 12, and stations arrangedly provided on the circumference can be severally indexedly positioned, and the stations on the circumference of the work table 10 are selectively and properly provided with the first automatic screwing device 14 and the second automatic screwing device 16, which automatically assemble a guide roller with the base work 32, according to each assembling process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw member assembling apparatus, and particularly when the screw member to be automatically assembled is a guide roller assembly, it is supplied and fixed to an index table provided for indexing. A screw member assembling apparatus for automatically tightening the automatically supplied screw member by indexing and positioning each tap hole of the base work at each station arranged around the index table. Regarding

[0002]

2. Description of the Related Art Heretofore, in the assembly of a guide roller assembly, a guide roller is screwed and attached to a base work and the height is adjusted by a manual operation and a simple assembly jig. That is, when the guide roller is screwed into the screw hole that has been pre-machined in the base work, after screwing the guide roller into the screw hole until it contacts the bottom of the screw hole with a torque driver with a torque set, rotate the guide roller slightly backward to rotate the guide roller head. The part is returned to a predetermined height and its position is measured, and then the side screw for fixing the shaft part of the guide roller is screwed from the direction orthogonal to the shaft part to assemble the base work on the guide roller. All this work was done manually.

[0003]

As described above, in the manual assembly work, the guide roller is screwed in until it comes into contact with the bottom of the screw hole, and the work of adjusting the head to a predetermined height while rotating the head in reverse is a skilled operation. The accuracy of the height to be adjusted is in micron units, and there is a drawback that it cannot be said that the technical level required by the product is adequately met no matter how much the assembly jig is improved. It was Further, since the fine parts are manually assembled, the assembly man-hours are required to some extent, and the certainty is poor, resulting in a high defect rate.

Therefore, an object of the present invention is to subdivide the guide roller assembling process into a single unit and to introduce an automatic assembling work apparatus suitable for the simple work, thereby reducing the work man-hours and the accuracy of the finished assembly. It is an object of the present invention to provide a structure of a screw member assembling apparatus for the purpose of completely automating the assembling process, which is intended to improve the manufacturing cost and reduce the defective rate.

[0005]

In order to achieve the above object, a screw member assembling apparatus according to the present invention is a screw member assembling apparatus for automatically assembling a screw member on a base work which has been pre-threaded. Comprises a first tap hole formed on the seat surface and a second tap hole formed in a direction orthogonal to the axis of the first tap hole, and the screw member assembling device positions and fixes the base work. A work table that can be indexed and positioned in order of each assembly process for each of a plurality of stations that are arranged around the periphery to automatically assemble screw members on the lever base work, and a fixing jig on this work table. A first station for automatically supplying a base work and a second station for automatically supplying a first screw member to a first tapped hole of a base work that is positioned and fixed. In this second station, the first screw member supplied and locked in the first tap hole is brought into contact with the bottom portion of the first tap hole by the positive rotation of the first automatic screw tightening device by the predetermined torque, and then the predetermined rotation is performed. A third station that reverses and sets it to a predetermined height position, and a second screw member that is gripped by a second automatic screw tightening device in a second tap hole of the positioned base work by a predetermined torque of this device. Fourthly, the screw is screwed in the forward rotation, and the tip of the screw is brought into contact with the first screw member, and then the screw is rotated by a predetermined rotation in the reverse direction to set the position.
The station and the first screw member screwed to the base work in the next step are positioned and set at a predetermined height position, and the first and second screw members are fastened to the first screw member with a predetermined torque. Fifth with automatic screw tightening device
When the station and the first screw member screwed to the base work in the next process are given a reverse rotational force by the predetermined set torque of the first automatic screw tightening device, the height position of the first screw member is set to the set height. It is composed of a sixth station for checking the tightened state by comparing with the position, and a seventh and an eighth station for discharging a non-defective product or a defective product determined by the tightened state of the screw member in the next step, respectively. And

[0006]

According to the screw member assembling apparatus of the present invention, when the screw member is automatically assembled to the base work which is preliminarily screwed, the guide roller as the screw member is incorporated when completing the assembly. 1 screw hole and a second screw hole for screwing a side screw as a second screw member for pressing and fixing the shaft portion of the guide roller from the direction orthogonal to this axis are formed in the base work, and this base work is mounted on the index table. The guide roller and the side screw are screwed into contact with the first screw hole and the second screw hole by using automatic screw tightening devices, respectively, and then they are slightly reversed. And set it to a predetermined position, then set the incorporated guide roller to a predetermined height position, and then set the side screw to the shaft part of the guide roller. Various automatic screw tightening devices that can confirm the tightening state of the guide roller by contacting and tightening it fully, and finally rotating the guide roller in reverse with a predetermined set torque and measuring and comparing the height position. By configuring an automatic assembly device using, the screw members can be assembled reliably, the accuracy of the assembly parts is improved, the defective rate is extremely reduced, and the assembly man-hours are significantly shortened, thus improving productivity. Can be measured.

[0007]

Embodiments of the structure of the screw member assembling apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. 1 is a schematic overall layout showing an embodiment of the structure of a screw member assembling apparatus of the present invention, FIG. 2 is an exploded perspective view of a guide roller assembly to be assembled, and FIG. 3 is mounted on a work table. Fig. 4 is an explanatory view of the process of assembling the guide roller to the base work. Fig. 4 shows the guide roller assembled in the first screw hole of the base work at an appropriate height position from the vertical direction.
FIG. 5 is a schematic structural cross-sectional view of an automatic screw tightening device for tightening a screw, and FIG. 5 is a schematic structural cross-sectional view of an automatic screw tightening device in which side screws are laterally screwed to press a shaft portion of a guide roller incorporated in a base work. Is. First, the overall configuration will be described. In FIG. 1, a mounting jig for fixing the base work 32 in a predetermined posture at each equally-divided position (8-divided in this embodiment) on the work table 10 that can be indexed and positioned. A tool 12 (see FIG. 2) is arranged, and around the work table 10, various automatic screw tightening devices 14, which are used for automatically assembling the guide roller 40 as a screw member on the base work 32, 16 and automatic carrier 1
8, 20, 22, and 24 are arranged to form a plurality of work stations.

Therefore, for the work stations divided into eight from the first station to the eighth station, the devices in these stations and the work process by these devices will be described. First, the guide roller assembly 30 to be assembled will be described with reference to FIGS. 2 and 3. Reference numeral 32 denotes a plate-shaped base work formed in a different shape. The base work 32 has a first tap. A hole 34 and a second tap hole 36 are formed in a direction orthogonal to the axis of the first tap hole 34. The first tap hole 34 has a small-diameter hole 38 formed coaxially through the bottom of the female screw portion, and the second tap hole 36 is orthogonally inserted into the small-diameter hole 38. On the other hand, the first tap hole 34
The guide roller 40 as a screw member screwed into
The roller R is rotatably supported on a support shaft having a locking groove 42 formed in its head, and a screw part 40a that can be screwed into the first tap hole 34 is formed on the support shaft below the roller R. At its lower end, a shaft portion 40b that can be fitted into the small diameter hole 38 is formed. The guide roller 40 screwed into the first tap hole 34 is set at a predetermined height position, and then the shaft portion 40b thereof is tightened and fixed by the side screw 44 to complete the assembly.

Next, the respective devices and processes from the first station to the eighth station of the work station will be described in detail for each station with reference to FIGS. 1 and 3. First, the first station (1.S
In t), when the base work 32 is transferred to the mounting jig 12 on the work table 10 by the automatic transfer device 18, the base work 32 is placed on the mounting jig 12 in a predetermined posture via the clampers 50 and 52. When fixed and mounted, the work table 10 is indexed to the second station.

Second station (2.St) in the next step
Then, the guide roller 40 is supplied by the automatic transport device 20. That is, the guide roller 40 is supplied to the first work hole 32 of the base work 32 by the automatic transfer device 20, and the shaft portion 40b of the guide roller 40 is supplied to the small diameter hole 3 of the base work 32.
8 is fitted and locked.

Subsequently, at the third station (3.St) in the next step, the first automatic screw tightening device 14 shown in FIG.
Is provided. However, as shown in FIG. 4, the first automatic screw tightening device 14 is elastically constantly downwardly supported by the holding member 60 by the linear motion bearing 64 so as to be vertically movable. The sleeve 80 to be pressed and a locking portion (not shown) which is rotatably supported by bearings 75, 75 in the sleeve 80 and is locked to the groove 42 of the head portion of the guide roller 40 are provided at the lower end and the upper portion. The sleeve 80 is lifted by the swinging motion of an arm 85 which operates in a seesaw method against the elastic force of a bit 56 as a rotating shaft having a pulley 84 attached to it and a compression spring 82 locked to a flange 66 of a sleeve 80. And a pneumatic cylinder 86 for driving the cylinder. Further, the rotary power of the pulse motor 70 is transmitted to the pulley 84 via a torque limiter 66 set to a predetermined set torque by an endless belt 65 stretched over a drive pulley attached to the output shaft. be able to.

By configuring the first automatic screw tightening device 14 as described above, the head of the guide roller 40 is positioned immediately below the bit 56 axis of the drive unit 54 of this screw tightening device 14, and the drive unit 54 is driven. Is lowered to rotate the bit 56, the bit 56 is locked in the groove 42 at the head of the guide roller 40.
By the positive rotation of the
The screw is advanced until a comes into contact with the bottom of the first tap hole 34 of the base work 32. This confirms whether the threaded portion of the first tap hole 34 is complete, and further rotates the bit 56 in the reverse direction to return the guide roller 40 to a predetermined height position, and the position of its head is measured by the measuring device 58. By comparing the height position of the screw member with a predetermined setting reference, the work table 10
Automatically moves to the 4th station.

The fourth station to be indexed next (4.S.
At t), the side screw 44 is screwed in by the second automatic screw tightening device 16 shown in FIG. That is, the second tap hole 36 is provided in this station with the drive unit 6
It is positioned so as to face the axis of the bit 62 of 0. In this case, the second station installed at this station
The automatic screw tightening device 16 is a parts feeder P shown in FIG.
The side screw 44, which is the second screw member supplied by F, is attached to the side screw 44 by the parts feeder, the drive unit 60 having a rotary drive unit that holds the side screw 44 as the second screw member by the vacuum suction portion at the tip and rotates the bit 62 with a predetermined set torque. It is configured to move up and down and reciprocate between a supply position (not shown) and the indexed second tap hole 36 of the base work 32.

The side screw 44 is elastically pressed against the second tap hole 36 by the drive unit 63 of the second automatic screw tightening device 16 thus constructed, and the bit 62 is normally rotated by the set torque to be screwed in. The side screw 44 is screwed until it comes into contact with the shaft portion 40b of the guide roller 40, and it is confirmed whether or not the screw portion of the second tap hole 36 is complete. Then, the side screw 44 is reversely rotated about two rotations to set it at a predetermined position. .

At the next fifth station (5.St),
Final assembly and dimensional measurement are performed by the first and second automatic screw tightening devices 14 and 16 described above. That is,
The work table 10 is rotated to move the base work 32 to the fifth position.
When the indexing positioning is performed on the station (5.St), the guide roller 40 is automatically torqued by the torque setting device 1
The drive unit 54 of No. 4 rotates a predetermined number of times to set it at a predetermined height position, and this is measured to compare and confirm with the set value. Then, the side screw 44 is rotated by the drive unit 60 to rotate the shaft portion 44b of the guide roller 40.
And is securely tightened by the set predetermined torque to complete the assembling work.

Next, at the sixth station (6.St),
The automatic screw tightening device 14 checks the looseness of the guide roller 40. That is, the guide roller 40 screwed to the base work 32 is the sixth station (6.S.
When indexed to t), the guide roller 40 fixed by the side screw 44 in the previous step is reversely rotated by the drive unit 54 of the torque-set automatic screw tightening device 14, and its height position is measured, Check the looseness of the guide roller 40 by comparing this with the set value,
The inspection / inspection work as the guide roller assembly 30 is performed, and the pass / fail judgment is executed.

When the inspection / inspection work is completed in this way, at the seventh station (7.St) indexed next, only the non-defective products judged at the sixth station (6.St) are transferred to the next transfer device 22. Carry out to the process. Further, the defective product is carried out to the outside by the carrying device 24 at the further indexed eighth station (8.St). As described above, according to the screw member assembling apparatus of the present invention, by automatically assembling the screw member by the method described above, the screw member can be surely assembled, the accuracy of the assembled parts is improved, and the defective rate is It is possible to improve the productivity by drastically reducing the number of assembly steps. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention.

[0018]

As described above, according to the structure of the conveying device of the present invention, in the screw member assembling device for automatically assembling the screw member on the base work which has been pre-tapped, the base work is It comprises a first tap hole formed in the seat surface and a second tap hole formed in a direction orthogonal to the axis of the first tap hole. A work table is provided for indexing and positioning in order of each assembly process at each of a plurality of stations arranged around the periphery where the screw members are to be automatically assembled on the base work, and the base work is mounted on the fixing jig on this work table. A first station for automatically supplying the first screw member and a second station for automatically supplying the first screw member to the first tap hole of the base work which is positioned and fixed. At the second station, the first screw member supplied and locked to the first tap hole is brought into contact with the bottom portion of the first tap hole by the normal rotation of the first automatic screw tightening device with the predetermined torque, and then the predetermined rotation is reversed. The third station for setting the lever at a predetermined height position and the second screw member gripped by the second automatic screw tightening device in the second tapped hole of the positioned base work are rotated normally by the predetermined torque of this device. The fourth station, in which the tip of the screw is screwed in and abutted against the first screw member and then rotated for a predetermined rotation to set the position, and the first screw member screwed to the base work in the next step is positioned at a predetermined height position. Position and set the second screw member to the first screw member with a predetermined torque, and the fifth station in which the first and second automatic screw tightening devices are arranged, and the base work in the next step. Checking the tightened state by comparing the height position of the first screw member with the set height position when applying a reverse rotational force to the combined first screw member by a predetermined set torque of the first automatic screw tightening device. By comprising 6 stations and 7th and 8th stations which respectively discharge good or defective products judged by the tightening state of the screw member in the next step, reliable assembly of the screw member becomes possible. The accuracy is improved, the defective rate is extremely reduced, the number of assembling steps is significantly shortened, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a schematic overall layout showing an embodiment of the structure of a screw member assembling apparatus of the present invention.

FIG. 2 is an exploded perspective view of a guide roller assembly to be assembled.

FIG. 3 is a process explanatory view of assembling a guide roller on a base work mounted on a work table.

FIG. 4 is a schematic structural cross-sectional view of an automatic screw tightening device for vertically assembling and screwing a guide roller into a first tap hole of a base work at an appropriate height position.

FIG. 5 is a schematic structural cross-sectional view of an automatic screw tightening device that laterally screws side screws to press a shaft portion of a guide roller incorporated in a base work.

[Explanation of symbols]

 10 working table 12 mounting jig 14 automatic screw tightening device 16 automatic screw tightening device 18 automatic transport device 20 automatic transport device 22 automatic transport device 24 automatic transport device 30 guide roller assembly 32 base work 34 first tap hole 36 2 tap hole 38 small diameter hole 40 guide roller 40a screw part 40b shaft part 42 locking groove 44 side screw 50 clamper 52 clamper 54 drive unit 56 bit 58 measuring device 60 drive unit 62 bit P / F parts feeder R roller

Claims (1)

[Claims] 1. A screw member assembling apparatus for automatically assembling a screw member on a base work pre-tapped with a tap hole, wherein the base work has a first tap hole formed on the seat surface and an axis line of the first tap hole. And a second tap hole formed in a direction orthogonal to the base member. The screw member assembling device is arranged around the periphery where the base work is positioned and fixed and the screw member is automatically assembled to the base work. A work table provided for indexing and positioning in each of the assembling steps in each station, a first station for automatically supplying a base work to a fixing jig on the work table, and a first work for positioning and fixing the base work. A second station for automatically supplying the first screw member to the tap hole, and a first station for supplying and locking the first tap member at the second station. The member is brought into contact with the bottom portion of the first tap hole by the normal rotation of the first automatic screw tightening device with a predetermined torque, and then is rotated by a predetermined rotation in the third station to set it at a predetermined height position. The second screw member gripped by the second automatic screw tightening device is screwed into the second tap hole of the base work by the normal rotation of the device by a predetermined torque, and the tip of the second screw member is brought into contact with the first screw member and then the predetermined rotation is reversed. Then, the fourth station for positioning the first screw member and the first screw member screwed into the base work in the next step are positioned and set at a predetermined height position, and the second screw member is predetermined for the first screw member. The fifth station, in which the first and second automatic screw tightening devices are arranged for tightening with torque, and the first screw member screwed to the base work in the next step
A sixth station for checking the tightening state by comparing the height position of the first screw member with the set height position when a reverse rotational force is applied by a predetermined set torque of the automatic screw tightening device, and the screw in the next step. 7. A screw member assembling apparatus, comprising: a seventh station and a eighth station for discharging a non-defective product or a defective product, respectively, which is determined by a tightened state of the member.