JPS59166457A - Polisher - Google Patents

Abstract

PURPOSE:To polish a thin sheet without damaging it, by providing a sensor downstream to a polishing brush to reverse a motor at the time of detection of the front edge of the sheet and reverse the motor again at the time of detection of passage of the rear edge of the sheet. CONSTITUTION:An upper polishing brush 4 is rapidly rotated counterclockwise so that a sheet 10 is pulled in between the brush and a backup roller 3 and polished and conveyed. The sheet 10 is conveed between a conveying wheel 1 and a push roller 2 as the sheet is directed by guides 7. When the front edge of the sheet 10 is detected by a sensor 8, a motor 5 is reversed by a signal from a controller 9 to rotate the polishing brush 4 clockwise. Since the sheet 10 is further conveyed as the motor is rotating clockwise, the rear edge of the sheet is not tossed by the polishing brush 4. When the rear edge of the sheet has passed by the sensor 8, the motor 5 is rotated counterclockwise again. A lower polishing brush is also operated similarly. Both the sides of the thin sheet can thus be simultaneously polished without damaging it.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a polishing apparatus suitable for polishing thin sheet materials such as inner layer materials of multilayer printed circuit boards.

Prior Art Conventional polishing devices for thin sheet materials have a mechanism in which the polishing brush rotates only in one direction. When the sheet material enters the brush, it enters smoothly, but when the sheet material comes out from the polishing brush, it does not flip up the sheet material, and the end surface of the sheet material is damaged. Conversely, if the polishing brush rotates in the opposite direction to the above, the sheet material will be thrown up when it enters the polishing brush.

When the polishing brush was rotated only in one direction as described above, there were problems in conveying and polishing the sheet material.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a polishing device capable of polishing thin sheet materials as soon as they are damaged.

The present invention provides a polishing device having a polishing brush that polishes a thin sheet material while being rotated by a motor, and a sensor that is provided on the exit side of the sheet material from the polishing brush and detects the presence of the sheet material; When the leading end of the sheet material is detected by receiving a signal from the sensor, the rotation direction of the motor is reversed, and when it is detected that the trailing end of the sheet material has finished threading by receiving a signal from the sensor. The polishing apparatus is characterized by having a control section that reverses the rotational direction of the motor again and returns it to the original direction.

Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a schematic diagram of the entire polishing apparatus viewed from the side. The compare wheel 1 and the pressing roll 2 are for conveying the sheet material.

The polishing brush 4 is a rotating body driven by a motor 5, and has a brush implanted on its surface. The guider is an aligning tool that reliably transports sheet materials with large warpage. Further, the control unit 9 changes the rotation direction of the motor 5 that drives the polishing brush 4 based on the signal from the sheet material detection sensor 8 . The spray nozzles 6 are for spraying abrasive, and are provided before and after the polishing brush 4 so that the rotation direction of the polishing brush 4 is reversed so that the polishing agent can be efficiently sprayed onto the polishing brush 4. The left half of FIG. 1 is a part for polishing the top surface of the sheet material, and the right half is a part for polishing the bottom surface.

FIG. 2 shows the portion where the upper surface of the sheet material 10 is polished and the process of transporting and polishing the sheet material 10 for that portion. Before putting the sheet material 10 into the polishing device,
The upper polishing brush 4 is rotating counterclockwise. The upper polishing brush 4 rotates at high speed and conveys the sheet material 10 while drawing it between it and the backup roll 3 while polishing it. When the sheet material 10 leaves the upper polishing brush 4, it is straightened by the guide 7 and transferred to the next compare wheel 1.
When the sheet material is conveyed between the presser roll 2 and the sheet material detection sensor 8 located ahead of it and detects the leading edge of the sheet material, the control section 9 is actuated by the detection signal to reverse the rotation of the polishing brush drive motor 5. and rotate it clockwise.

When the sheet material is conveyed in this state, when the sheet material leaves the upper polishing brush 4, the polishing brush 4 is rotating clockwise, so that the sheet material can be conveyed without flipping up the edge of the sheet material. When the rear end of the sheet material passes the sheet material detection sensor 8, the control section 9 is actuated by the detection signal, and the rotation of the polishing brush drive motor 5 is reversed to return to the original state of counterclockwise rotation. .

By controlling the lower polishing brush 4 in the same manner as the upper polishing brush 4, the lower surface of the thin sheet material can be polished.

Effects of the Invention According to the present invention, as soon as a thin sheet material is damaged, both sides of the sheet material can be simultaneously polished.

[Brief explanation of the drawing]

FIG. 1 is a side view of a polishing device according to an embodiment of the present invention, as seen from the side, and FIG. 2 shows a portion of the polishing device shown in FIG. FIG. 3 is a side view showing the polishing process. 4... Polishing brush 5... Motor 8... Sheet material detection sensor 9... Control department attorney Akio Takahashi 12 O 2 Field

Claims (1)

[Scope of Claims] An apparatus comprising upper and lower transport rolls for transporting a thin sheet material, a polishing brush that is driven by a motor and polishes one side of the unused sheet material while rotating, and an apparatus comprising: a sensor provided on the exit side of the sheet material to detect the presence of the sheet material; and a sensor for reversing the rotational direction of the motor when the leading end of the sheet material is detected by receiving a signal from the sensor; A polishing device comprising: a control section which reverses the rotational direction of the motor again and returns it to the original direction when it is detected that the rear end of the sheet material has finished passing by receiving a signal from the motor.