JPS6248462A - Dressing system for automatic buff machine - Google Patents

Abstract

PURPOSE:To automatically reshape and clean a buff, by placing the buff, in rotation, to approach a dressing tool and stopping the approaching action, when an electric motor rotating the buff generates an electric load current to agree with the predetermined value, simultaneously performing dressing work for a predetermined time. CONSTITUTION:If a dressing device is placed coming to the predetermined position of a buffing unit, a buff table advances in a quick feed speed from a stop position P0, before dressing work, to a position P1 simultaneously stops moving the vertical direction position of a buff to the neutral point. Next, the buff table advances in a slow feed speed from the point P1, and if an external diameter part of the buff 7 is brought into contact with a dressing tool 6, an electric current value of a buff motor gradually increases, soon if the load current value agrees with a preset level, the buff table stops in a stop position P2. The buff 7 immediately starts oscillation in a direction of a-b, and after a predetermined time, the buff table, both rapidly retracting to a position P3 and stopping also the oscillation, finishes the dressing work. Accordingly, the contact position P2 generates almost no change even if an external diameter of the buff 7 gradually decreases.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dressing system for an apparatus that automatically buffs and finishes watch case parts and the like.

[Conventional technology]

Various attempts have been made to develop devices for automatically buffing watch case parts. ing.

[Problem that the invention seeks to solve]

However, since the body of a wristwatch case part has a complicated shape and the finishing quality required is higher than that of the case back, no suitable device has been provided. Various types of buffs are used in buffing work, but since the work being processed has a complex shape, the initial shape may gradually collapse and become deformed, or abrasives and abrasive powder may condense on the surface of the buff. Polishing ability decreases, making it difficult to maintain uniform polishing quality. In such cases, dressing work is required, and in most cases the dresser is held manually and brought into contact with the buff to shape and clean the buff surface.

Therefore, a great deal of time is required for the dressing operation, and automation of the dressing operation has become an indispensable element in automatic equipment for buffing operations.

An object of the present invention is to solve the above-mentioned conventional problems and provide an automatic buff dressing system for an automatic buffing device.

[Means for solving problems]

In the present invention, a dressing device is disposed on a conveying plate that moves on a conveying table, and a dressing tool that can be freely rotated by the contact pressure of a buff is attached to the shaft portion of the dressing device.
When the rotating buff approaches and contacts the dressing tool with its oscillation operation stopped, the load current value of the motor that rotates the buff is compared with a preset current value, and when they match. The buff approaching operation is stopped, and at the same time, oscillation is applied to the buff to perform dressing work for a predetermined period of time.

〔Example〕

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

FIG. 1 shows a cross-sectional view of the dressing device of the present invention. Reference numeral 2 denotes a conveyor plate of a station type automatic buffing machine, and the dresser or workpiece mounting jig table is mounted on a conveyor wheel 7'. Reference numeral 3 denotes a base of the dressing device, which is installed and fixed on the conveying plate 2. 4 is a dresser bearing, which is fixed to the dressing device base O. Reference numeral 5 denotes a dressing tool holding shaft, which is supported by a dresser bearing 4 and can freely rotate together with the dressing tool 6 as the buff comes into rotational contact with the dressing tool 6. Reference numeral 6 denotes a dressing tool, which in this embodiment is a grindstone with a shaft, the shaft portion of which is fixed to the dressing tool holding shaft 5. Fig. 2 is a perspective view showing the dressing device and workpiece fixing jig table mounted on the conveyance table, and Fig. 3 shows how the rotating buff approaches or stops the dressing tool.
It is an explanatory view showing a state of retreating.

Next, the process of dressing the buff 7 will be explained based on FIGS. 1, 2, and 3. Further, this dressing work is shown in the flowchart of FIG.

First, a buff motor (not shown) is used to rotate the buff 7.
Turn on the power. A large starting current momentarily flows through the motor, but it quickly stabilizes to a constant no-load current value. After this, a current sensor (not shown) is electrically turned on. Next, turn on the cycle start switch. Therefore, the conveyance plate 2 moves by one pitch. When a sensor (not shown) detects that the dressing device has come to a predetermined position of the buffing device, the buffing table (not shown) is brought to a stop position P before the dressing operation. At the same time, the buff moves to a neutral point in the vertical direction and stops. Next 2
From the 1st point, the robot continues to move forward until a stop signal is input. Eventually, when the outer diameter of the buff 7 comes into contact with the dressing tool 6, the current value of the buff motor gradually increases, and when it matches the value set as the load current value through an electrical comparison circuit, a buff table stop signal is output and the buff table stops. stops at stop position P2. The buff 7 immediately starts oscillating in the direction of arrow a-b by a buff oscillation device (not shown). At the same time, a timer is activated, and when the set predetermined time has elapsed, an output signal is issued from the timer and the buff table rapidly retreats and stops at 23 points. Note that the oscillation operation is also stopped and the series of dressing operations is completed. The amount of retreat from point 22 to point 21 is set so that point Pa and point 23 match.

Although the outer diameter of the buff 7 gradually decreases due to dressing work and polishing work pressure, the contact position P2 with the dressing tool 6 hardly changes as described above. The position of the point is automatically corrected in the forward direction. Furthermore, by appropriately setting the distance between P2.25, the length of time required for the buff 7 to move forward does not increase when the buff diameter changes.

4 and 5 show the direction of the buff and the forward cutting direction with respect to the dressing tool 6, and dressing work is possible in either case.

In the figure, 8.9 is a buff, 8a and 9a are buff axes,
A is the direction of the buff with respect to the dressing tool and the forward cutting direction, B
-B indicates the direction of rotation of the dressing tool driven by the movement of the buff.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, shaping and cleaning of the buff can be automated. Also, if you keep the load current set value constant, you can always obtain a stable dressing condition.Depending on the condition of the buffing surface, you can lengthen or shorten the dressing interval or change the load current set value or dressing time set value to adjust the situation. It is possible to provide the best conditions that match.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIG. 1 is a sectional view of the dressing device, and FIG. 2 is a perspective view showing the state in which the dressing device and the workpiece fixing jig are mounted on the transfer table. Figures 3 and 3 are explanatory diagrams showing the states in which the buff approaches, stops, and retreats from the dressing tool. Figures 4 and 5 are driven by the direction of the buff relative to the dressing tool, the forward cutting direction, and the movement of the buff. FIG. 6 is a flowchart showing a series of operating states. 1... Transfer table, 2... Transfer plate, 4... Dresser bearing, 6...
Dressing tools, Fig. 1 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] A dressing device is disposed on a conveying plate that moves on a conveying table, and a dressing tool that can freely rotate by the contact pressure of a buff is attached to the shaft of the dressing device, and the rotating buff performs an oscillation operation. The load current value of the motor that rotates the buff, which is generated by approaching and contacting the dressing tool with the dressing tool stopped, is compared with a preset current value, and when the current value matches, the approaching operation of the buff is stopped, and at the same time A dressing system for an automatic buffing machine characterized by being configured to apply oscillation to a buff and perform dressing work for a predetermined period of time.