JPH0218070Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention brings the work tool to the working position to start and stop the work tool when assembling parts in the manufacturing process of articles, and uses a spring spring to bring the work tool to the working position. A function that automatically controls the operation by returning to the original position with the stored elasticity of the machine, and also confirms whether the specified work has been performed at the work position and whether the work has been performed in the determined work order. The present invention relates to a spring balancer having:

In general, the assembly work of parts in the manufacturing process of articles, for example, the assembly process of automobile seats, is required to be carried out perfectly according to a predetermined assembly order, and therefore standard work is carried out in each assembly process. In order to ensure thoroughness, it is necessary to start and stop the working tools during the above-mentioned assembly work, perform the work in each process, and check whether or not the assembly is carried out in the prescribed order.

Various methods are known for starting and stopping the power tool, performing work in each process, and checking whether or not assembly has been carried out in the prescribed order.
Particularly in the automobile manufacturing process, when assembling parts, cotton impregnated with ink is attached to the tip of the work tool, and the parts are assembled at the same time as the work tool is used to assemble the parts. Apply the above ink to a part. The operator then checks whether or not the predetermined assembly has been performed by checking the presence or absence of ink on the parts. By the way, the working tool for performing the above-mentioned assembly work was attached to the spring balancer.

The configuration of a conventional spring balancer is as shown below.

In FIG. 1, reference numeral 1 denotes a case body of a spring balancer, which has a truncated conical shape, and has an opening groove 2 of a predetermined length formed in a part of its circumferential surface. Reference numeral 3 denotes a shaft which is a non-rotating shaft, both ends of which are supported by the case body 1, the first side end surface 4 protrudes from the small diameter end surface 5 of the case body 1, and a ratchet wheel 6 is attached to the end portion 4; The ratchet wheel 6 is then locked by a claw-like stopper 7 provided on the case body 1. That is, the shaft 3 is attached to the case body 1 so that it can rotate in one direction. 8 is a wire drum which is a truncated conical member;
It is rotatably installed on the shaft 3, and a spiral groove 10 is formed on its peripheral surface 9, and a wire (not shown) is wound around the spiral groove 10. Also, the wire drum 8 has a spiral spring 11.
One end 12 of the spiral spring 11 is fixed to the shaft 3, and the other end 13 is fixed to the side surface of the wire drum 8. Therefore, when the wire is pulled out, the wire drum 8 rotates while winding the spiral spring 11, causing the spiral spring 11 to accumulate winding force. As shown in FIG. 2, a hook-shaped hook 14 is attached to the circumferential surface of the case body 1, and a wire 15 that is wound around the circumferential surface of the wire drum 8 and pulled out from the opening groove 2 of the case body 1 is attached. A mounting member 16 for mounting a working tool is attached to the tip.

When assembling the parts to achieve the above-mentioned structure, a working tool suspended via a mounting member 16 is attached to the drawn-out end of the wire 15 of the spring balancer installed above the work position on the process line. When pulled downward, the wire 15 fitted in the wire drum 8 inside the case body 1 is pulled out. The wire 15 is pulled out by a predetermined length to bring the working tool to a predetermined working position. Thereafter, the assembly work is performed by operating the drive switch attached to the work tool. Here, since a spiral spring 11 is installed inside the wire drum 8 in the case body 1, the restoring force of the spiral spring 11 makes it possible to turn off the drive switch of the power tool and release the power tool at the end of the above-mentioned assembly work. For example, the wire 15 is automatically moved by the stored elasticity of the mainspring spring 11.
is wound up and the work tool is pulled into position before use. By the way, there are various kinds of the above-mentioned work tools, and their weights etc. are also different. Therefore, in order to smoothly move the above-mentioned work tools up and down at the start and end of use, the above-mentioned work tools are installed in the wire drum 8. The tensile force by the spiral spring 11 must be adjusted. To make this adjustment, move the stopper 7 away from the ratchet wheel 6,
The spiral spring 1 whose one end 12 is fixed to the shaft 3 is rotated manually.
1, the ratchet wheel 6 is locked by the claw-shaped stopper 7, the ratchet wheel 6 is fixed at a proper position, and the tensile force of the spiral spring 11 is adjusted.

In the structure of the conventional spring balancer as described above, the rotational force of the rotating part, which is the wire drum, cannot be extracted to the outside of the case body. Therefore, it is not possible to take out a signal depending on the rotational state of the wire drum, and it is not possible to use this signal to control starting and stopping of the working tool during assembly work. Therefore, the assembly work lacked reliability. Furthermore, it was difficult to confirm whether or not the predetermined assembly was performed. One of the above confirmation methods is to use the ink mentioned above, but if too much ink is applied to the part, it will stain the part, and if it is too little, the ink will run out during the work, which can cause problems. As a result, ink must be replenished, which is very troublesome and time-consuming.

The present invention has been developed in view of the above-mentioned problems of the conventional art.The present invention is a truncated cone shaped member 8 having a spiral groove 10 on the circumferential surface inside the case body 1 which is shaped like a truncated cone and has an opening groove 2 on the circumferential surface. is rotatably provided on the non-rotating shaft 3 with a spring spring 11 biasing the wire in the winding direction, and while the case body 1 is suspended above the working position, the wire is wound in the spiral groove 10 of the truncated conical member 8. This is a spring balancer in which a working tool is fixed to the end of a wire drawn out from an opening groove 2, and the end 4 of a non-rotating shaft 3 which rotatably supports the truncated conical member 8 is supported by the case body 1. The end portion 4 is made to protrude from the case body 1, and the rotation of the non-rotating shaft 3 is restricted by ratchet mechanisms 6 and 7 provided between the protruding end portion 4 and the case body 1, and the other end is inserted into the case body 1. The truncated conical member 8 is inserted into the non-rotating shaft 3 so that the side surface on the side of the ratchet mechanism is directly supported by the non-rotating shaft 3, and the other side is supported by a bearing member 17 whose end protrudes from the case body 1. The other end of the non-rotating shaft 3 and the case body 1 are rotatably supported through the bearing member 17, and a small gear 18 is fixed to the protruding end surface of the bearing member 17.
The case body 1 is provided with a large gear 19 that meshes with the small gear 18, a cam 20 is fixed to the large gear 19, and a limit switch 21 that is turned on and off by the cam 20 is provided on the case body 1. The cam 20 is rotated at a reduced speed in conjunction with the rotation of the truncated conical member 8 due to the wire pulling operation and the winding operation of the spiral spring 11, and the limit switch 21 is turned on and off at predetermined times, and the power tool is driven by this signal. To provide a spring balancer characterized in that it is configured to control, complete execution of work, and confirm suitability of work order.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 3 and 4, reference numeral 1 denotes a truncated cone-shaped case body, and an opening groove 2 of a predetermined length is formed in a part of the circumferential surface. 3 is the shaft which is a non-rotating axis,
The end portion 4 is supported by the lower end surface 5 of the case body 1 and protrudes from the case body 1, a ratchet wheel 6 is mounted on the protrusion 4, and a claw engages with the ratchet wheel 6 on the case body 1. A stopper 7 having a shape is provided, and the ratchet wheel 6
and the stopper 7 constitute a ratchet mechanism, which allows the shaft 3 to rotate in one direction. In addition,
The other end of the shaft 3 extends to the vicinity of the inner surface of the other end of the case body 1, and is supported by the case body 1 via a wire drum 8 and a bearing member 17, as will be described later. 8 is a wire drum which is a truncated conical member, and this is connected to the shaft 3 above.
A spiral groove 10 is formed on the circumferential surface 9, and a wire (not shown) is wound around the spiral groove 10. In addition, a mainspring 11 is installed inside the wire drum 8.
One end 12 of the spiral spring 11 is fixed to the shaft 3, and the other end 13 is fixed to the side surface of the wire drum 8. Reference numeral 17 denotes a bearing member, which extends from the center of the large-diameter end surface of the wire drum 8.
It is rotatably attached to the end of the shaft 3, that is, a portion located near the inner surface of the case body 1, and a part of the bearing member 17 is extended to the center of the end surface of the case body 1, and this extension is attached to the case body 1. It is rotatably supported with respect to the case body 1 at the center of the end face. An extension of the bearing member 17 is exposed at the upper end surface 5' of the case body 1. A small gear 18 is installed on the upper end surface of the extension of the bearing member 17 and meshes with a large gear 19 installed on the upper end surface 5' of the case body 1. Small gear 18 and large gear 19
has a predetermined gear ratio. Reference numeral 20 denotes a cam of a predetermined shape, which is installed on the upper end surface of the large gear 19. Reference numeral 21 denotes a limit switch, which is connected to the case body 1 so as to be activated by the rotation of the cam 20.
It is installed at a predetermined position on the upper end surface of.

Using the spring balancer with the above configuration, parts are assembled in the following manner. When the work tool suspended from the wire tip of a spring balancer installed above the work position of the process line is pulled downward, the wire (not shown) wound around the wide drum 8 inside the case body 1 is pulled out. Ru.
The wire is pulled out by a predetermined length and the working tool is installed at a predetermined working position. At this time, the wire drum 8 rotates a predetermined number of times. This rotation of the wire drum 8 is transmitted to a bearing member 17 installed on the upper end surface of the wire drum 8, and the bearing member 1
A small gear 18 rotates via the gear 7. When the small gear 18 rotates, the large gear 19 rotates at a reduced speed and counter-rotates by a predetermined angle, and the cam 20 similarly rotates by a predetermined angle. At the end of the rotation, that is, the wire is pulled out by a predetermined length and the work tool is at a predetermined working position. When set to , the limit switch turns ON and the power tool starts automatically. Furthermore, when the worker releases the work tool after completing the work, the wire is automatically wound around the wire drum 8 by the restoring force of the spiral spring 11 installed in the wire drum 8, and the work tool is returned to its predetermined position before use. pulled into position. This reverse rotation of the wire drum 8 causes the small gear 18 and the large gear 19 to rotate in the reverse direction via the bearing member 17, returning the cam 20 to its original state, and the limit switch is released.
It becomes OFF and the work tool automatically stops.

The timing adjustment for operating the limit switch is determined by the shape of the cam 20.
Therefore, the above timing adjustment is performed by replacing the cam 20. In addition, since there are various types of work tools and their weights etc. are different, in order to smoothly move the work tools up and down at the time of starting and ending use of the above-mentioned work tools, they are installed in the wire drum 8. The tensile force by the mainspring spring 11 must be adjusted. This adjustment is done by stopper 7.
is released from the ratchet wheel 6, and by rotating the ratchet wheel 6, the spiral state of the spiral spring 11 whose one end 12 is fixed to the shaft 3 is changed via the shaft 3, and after adjustment, the ratchet wheel 6 is rotated. By engaging the claw-like stopper 7 with the ratchet wheel 6, the ratchet wheel 6 is fixed at a proper position and the tensile force of the spiral spring 11 is adjusted.

As explained above, according to the present invention, the rotating part, which is the wire drum, can be taken out of the case body via the bearing member, so this movement can be used to start the power tool during assembly work. It becomes possible to control the operation and stopping, and the reliability of the work is dramatically improved. Further, by using this spring balancer, it becomes very easy and simple to check the performance status and work order of a predetermined assembly work, as shown below.

For example, during assembly work such as bolt tightening work, when parts placed on a conveyor are transported, the bolts are tightened while being suspended from a spring balancer installed above the work position on the process line. When the impact wrench, which is an attached tool, is set at a predetermined working position, a limit switch installed in the case body is turned on, the impact wrench is automatically started, and the bolt is tightened with an appropriate tightening torque. When the worker releases the impact wrench after the tightening work is completed and the impact wrench is pulled up to the position before use, the limit switch is activated.
When turned OFF, the impact wrench will automatically stop. At this time, a signal indicating the operating state of the limit switch of the spring balancer is transmitted to a control box installed outside the process line, and is displayed by an indicator light via the control box. Furthermore, the parts are transported to the next working position, and the bolts are tightened to a predetermined tightening torque using a QL wrench with a limit switch, which is a bolt tightening confirmation tool. At this time, a signal indicating the operating state of the limit switch of the wrench is transmitted to the control box and displayed by the indicator light via the control box. Therefore, when bolt tightening work, which is assembly work based on work standards, is performed, the conveyor will operate normally, but if work that differs from the above work standards is performed, the control box will determine an abnormality and issue an alarm. A buzzer and indicator light notify the operator of the occurrence of an abnormality, and the conveyor stops at a predetermined position. If the predetermined assembly work is quickly performed here, the alarm buzzer and indicator light will be turned off and the conveyor will resume normal operation.
Therefore, in the assembly work using the spring balancer according to the present invention, it is easy to control the start and stop of the power tool, and to confirm the execution of the work and the operation order, and the operator can quickly and accurately perform the assembly work. It is possible to work more efficiently, and work efficiency is dramatically improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional spring balancer, FIG. 2 is a schematic perspective view of FIG. 1, and FIG. 3 is a plan view of a spring balancer according to an embodiment of the present invention.
FIG. 4 is a front sectional view of FIG. 3. 3... Non-rotating shaft, 8... truncated conical member, 17...
... Bearing member, 18 ... Large gear, 19 ... Small gear,
20...cam, 21...limit switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A state in which a truncated cone-shaped member having a spiral groove on the periphery is biased in the direction of winding the wire by a spiral spring inside a truncated-conical case body having an opening groove on the periphery. The spring balancer is rotatably mounted on a non-rotating shaft, the case body is suspended above the working position, and a working tool is fixed to the end of the wire wound in the spiral groove of the truncated conical member, which is pulled out from the opening groove. The end of the non-rotating shaft rotatably supporting the truncated conical member is supported by the case body, and the end protrudes from the case body, and a ratchet mechanism is provided between the protruding end and the case body. to restrict the rotation of the non-rotating shaft, the other end is kept inside the case body, the truncated conical member is inserted into the non-rotating shaft, the side surface on the side of the ratchet mechanism is directly supported by the non-rotating shaft, and the other end is held in the case body. , the other end of the non-rotating shaft and the case body are rotatably supported via a bearing member whose end protrudes from the case body, a small gear is fixed to the protruding end surface of the bearing member, and the case body has a A large gear that meshes with the small gear is provided, a cam is fixed to the large gear, a limit switch is provided on the case body that is turned on and off by the cam, and the truncated conical member is rotated by the pulling out of the wire. In addition, the cam is rotated at a reduced speed in conjunction with the winding operation by the mainspring spring, and the limit switch is turned on and off at predetermined times, and this signal is used to control the drive of the work tool, complete the work, and confirm the suitability of the work order. A spring balancer characterized by: