JPS6344500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt grinding device that grinds the outer surface of a wristwatch case into a desired shape while applying rotation.

The upper slope or side surface of a wristwatch case has a complex continuous curve or shape, and it was necessary to grind and buff this complex shape into an elegant and well-balanced shape in plan view.

Conventionally, this was done manually by selecting a skilled worker and relying on the skill of that worker, or relying on the experience and intuition of workers who have been working for many years, by bringing the processing case into contact with the grinding belt. . As a result, the shape of the product is not consistent, resulting in poor yields, and the work requires careful and time-consuming work, resulting in poor productivity and high labor costs.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide an apparatus that mechanizes the grinding of a wristwatch case and takes automatic control into consideration.

The present invention will be explained below based on the illustrated embodiments. The overall structure of the belt grinding device of the present invention is shown in FIG.

The belt grinding device is equipped with grinding belts A and B, and requires a grinding belt drive mechanism 1 using motors M ₁ and M ₄ as drive sources, and a wristwatch case 9 chucked on a chuck 12 attached to a case holding shaft 11. and a case drive mechanism section 2 configured for grinding into a shape, both of which are incorporated into the device main body 10 so as to face each other. The general configuration of the grinding belt drive mechanism section 1 includes a drive mechanism 39 for the grinding belt A using a motor _M1 as a drive source, and a grinding belt B using a motor _M4 as a drive source for continuous rotation and inching rotation.
Drive mechanism 4 for the grinding belt B to achieve a seed drive mode
It is composed of 0. Further, the general configuration of the case drive mechanism section 2 includes a case holding device 3 consisting of a case holding shaft 11, a chuck 12, etc., and a case 9.
a motor M ₃ , a cam 13 , and a cam 13 for rotating and performing a copying motion for grinding to a required external shape;
Cam follower 14, timing belt 15 (second
A rotation and copying mechanism 4 consisting of
A motor for reciprocating the case 9 within the width of the grinding belt so as to effectively use the width of the grinding belt.
A case reciprocating mechanism 5 consisting of M ₂ , a disc 17, a connecting rod 18, etc., and an air cylinder L ₂ for moving the case 9 from grinding belt A to grinding belt B or from grinding belt B to A, etc. It is mainly composed of a case moving mechanism 6 and a mechanism 7 that moves the entire case drive mechanism section 2, which is composed of an air cylinder _L1 and the like for bringing the case 9 into contact with either of the grinding belts A and B during processing. There is. Further, a control device 8 is provided in the belt grinding device main body 10 in order to control the operation of each mechanism 39, 40, 4, 5, 6, 7 of the grinding belt drive mechanism section 1 and the case drive mechanism section 2. .

Next, the details of the configuration will be explained. First, the case drive mechanism section 2 will be explained.

The table 21 is attached to the main body 10 of the apparatus in the front-rear direction (the direction in which it is near and far from the grinding belt drive mechanism section 1,
The piston rod of the air cylinder L ₁ serves as a mechanism 7 that moves the table 21 forward and backward at its rear end and moves the entire case drive mechanism 2 placed on the table 21. I am wearing it. A work stand 22 is placed on the table 21.
is placed so as to be able to slide in the left and right direction (left and right directions with respect to the grinding belt drive mechanism section 1, hereinafter the left and right descriptions are the same), and one end is fixed to the left end of the table 21 to grind the case 9. Attach the piston rod of air cylinder _L2 for left and right movement, which constitutes the case moving mechanism 6 that moves between belts A and B.
The left end erected edge 22a is provided with a motor _M2 for a case reciprocating mechanism 5 for reciprocating the case holding device 3 via a bracket 23, and a disc 17 fixed to its drive shaft. A work head stand 24 is placed on the work stand 22 so as to be movable from side to side by being fitted into two guide rods 25 and 26 extending between the left and right edges of the work stand 22, and at the left end thereof is the circle. One end of the connecting rod 18 is pivotally connected to an eccentric position of the plate 17, and the other end of the connecting rod 18 is pivotally connected. Note that the eccentric distance of the pivot point of the connecting rod 18 on the disk 17 side with respect to the center of the disk 17 is slightly smaller than the width W of the grinding belts A and B. The work head stand 24 passes two guide rods 27 and 28 between the standing edges at the front and rear ends, and these
9 is inserted and guided. A spring 31 surrounded by each of the guide rods 27 and 28 is provided between the work head 29 and the standing edge of the rear end of the work head stand 24.
The work head 29 is always pressed forward. Further, a cam follower 14 is fixed to the right side between the front and rear erected edges of the work head 29 so as to be able to adjust its position back and forth. The work head 29 is equipped with a case holding shaft 11 at the front and a camshaft 32 and a motor _M3 at the rear.
are arranged parallel to each other in the left-right direction and connected to each other by a first timing belt 15 (FIG. 2).
Furthermore, the camshaft 32 and the drive shaft of the motor _M3 are connected to the second
are connected by a timing belt 16 (Fig. 1),
The case 9 rotates and follows the cam 13 to make a grinding belt surface and perform a following movement. A chuck 12 is attached to the right end of the case holding shaft 11, and the case 9 is attached and removed using a well-known chucking method.
is applied to loosen the chuck 12 and remove the case 9. With the lever 30 left in place, the case 9 is inserted into the chuck 12, and the lever 30 is returned to its original position.
Open it and fix case 9.

As described above, the case drive mechanism section 2 is connected to the table 2.
1. The work table 22, the work head table 24, and the work head 29 have a four-layer structure that allows them to slide relative to each other.

Next, the structure of the grinding belt drive mechanism section 1 will be explained. In this embodiment, an endless grinding belt A for rough grinding and an endless grinding belt B for finish grinding and for forming filaments formed by abrasive grains after finishing grinding are arranged side by side. Grinding belt A
is wrapped around a drive pulley A41, an idle pulley A42, and a contact roller A43, and the grinding belt B, like the grinding belt A, is wrapped around a drive pulley B44,
Idle pulley B45, contact roller B46
It's all over the place. (Figures 1 and 3). The drive pulley A41 and the drive pulley B44 (FIG. 3) are each independently mounted on the main body 10, and the idle pulley A42 and the idle pulley B45 are separately mounted on the top of the support member 47 that stands up from the main body 10. The contact roller A43 and the contact roller B46 are separately mounted on shafts at the rear end of the main body 10 (on the side of the case drive mechanism section 2). Pulley A4 provided coaxially with drive pulley A41 of grinding belt A
A transmission belt 51 is stretched between 1a and an output pulley A48 of the motor _M1 , and transmits the power of the motor _M1 to the grinding belt A. A transmission belt is installed between pulley B (same as pulley A, not shown) provided coaxially with drive pulley B44 of grinding belt B and motor M ₄ (same as motor M ₁ , not shown). 5
2 is tensioned, and motor M ₄ is installed in the same way as grinding belt A.
power is transmitted to the grinding belt B. In addition, the motor
Since M ₄ is controlled by the output signal from the control device 8 so that it can perform two types of driving modes, continuous rotation and inching rotation, the grinding belt B is given continuous rotation and inching. Note that the rear end surfaces (front end surfaces for the case 9) of the contact rollers A43 and B46 of the grinding belts A and B are in the same plane with respect to the moving direction of the work head table 24. Also,
A stopper (not shown) is provided on the main body 10 in front of the table 21 in the moving direction to restrict the amount of forward movement of the table 21.

In addition to the above, motors _M1 to _M4 , air cylinders
The control device 8 includes a control circuit for controlling L ₁ , L _{2 ,} etc., and although the details of the circuit are omitted, it has a program setting section, a program storage section, and an output section in terms of blocks.

Next, the operation of this device will be described. In this embodiment, two grinding belts A and B with different grain sizes are used to perform rough grinding, finish grinding, and basis weight processing. Here, a first type process that performs the first two processes and a second type process that performs the three processes will be explained as examples. In either case, it is assumed that the control circuit has memory of the program for that process.

"Type 1 process" (1) By pressing the first start button (not shown), the motor _M1 is activated, and the transmission belt 51,
Grinding belt A rotates via pulley A41a and drive pulley A41. At this time, the motor
_M4 is stopped.

(2) Attach the case 9 to be processed to the chuck 12 of the case holding shaft 11. At this time, a pin (not shown) is provided on the chuck 12 so that the case 9 and the copying cam 13 are in the same phase, and the case 9 is brought into contact with the cam 13 to match the shape.

(3) Press the cycle button (not shown) to start the motor.
M ₂ and M ₃ operate, the case holding shaft 11 and the cam shaft 32 rotate synchronously, and the work head stand 2
4 starts reciprocating from side to side within the width W of the grinding belt.

(4) Operate the forward and backward air cylinder _L1 to move the table 21 forward until it contacts the stopper. This movement is controlled by the control device 8 in the case 9.
When the grinding belt approaches the grinding belt A, the speed can be slowed down.

(5) Case 9 is in contact with grinding belt A, and copying cam 1
3, copy grinding is performed. Case 9 moves the grinding belt A in small steps from side to side within the belt width W to effectively use the entire width of the belt A and extend the life of the belt.

(6) When the time required for the case 9 to rotate one or more times has elapsed, the rough grinding ends, the air cylinder _L1 operates in the opposite direction to move the table 21 backward, and the case 9 is transferred to the grinding belt A. away from.

(7) Next, the left-right moving air cylinder _L2 is activated, the work table 22 moves to the right, and the case 9 moves to a position corresponding to the grinding belt B. motor
M ₂ and M ₃ continue to rotate, and the rotation of the case 9 and the left-right reciprocating movement of the work head stand 24 continue.

(8) Motor _M4 is activated and motor _M1 is stopped by pressing a second activation button (not shown). The operation of the motor _M4 causes the grinding belt B to continuously rotate via the output pulley B, belt 52, pulley B, and drive pulley B44.

(9) Operate the forward and backward air cylinder L ₁ again,
Finish grinding is performed by bringing the workpiece 9 into contact with the grinding belt B. When the grinding is completed after a predetermined time,
Air cylinder _L1 operates in the opposite direction to the table 21.
is moved backward, and the workpiece 9 (which is a finished product) is separated from the grinding belt B.

(10) The left-right moving air cylinder _L2 operates in the opposite direction to move the work head stand 24 to the left, and the work head stand 24 returns to its original position. At this point, the motors M ₂ and M ₃ stop for the first time, so the work 9 that has been finished being ground is removed, and the work 9 that has not yet been machined is mounted on the chuck 12 .

(11) Repeat the above cycle.

"Type 2 process" (1) Perform up to step (8) of "Type 1 process".

(2) Operate the forward and backward air cylinder L ₁ again,
Finish grinding is performed by bringing the workpiece 9 into contact with the grinding belt B. When the grinding is completed in a predetermined time, the air cylinder _L1 operates in reverse to move the table 21 backward and separate the case 9 from the grinding belt B.

(3) By pressing the third start button (not shown), the motors _M1 to _M4 are stopped, and the rotation of the grinding belts A and B and the left and right movement of the work table 22 are stopped. Then, the control of the motor _M4 is switched so that the activation state of the motor _M4 has a rest period and a rotation period.

(4) Activate the forward and backward air cylinders _L1 to press the ground case 9 onto the grinding belt B.
Motor _M3 is activated to rotate case 9, but
At that time, since the grinding belt B is stopped while the motor _M4 is in rest, the abrasive grains of the belt B are rubbed on the ground surface of the case 9, and the unevenness of the rubbing is the desired design of the case 9. becomes. The motor _M4 is activated when the case 9 is moved backward, and the grinding belt B is inched and stopped. This makes it possible to prevent poor fabric weight due to clogging of the grinding belt B. Most of the shape of the case 9 is such that the legs to which the band is attached rotate every half turn, so at this time, the case 9 is moved back by an amount equivalent to the protrusion of the legs and an amount equivalent to the gap that does not come into contact with the grinding belt B. Since the profile of the cam 13 is formed at this time, the grinding belt B is rotated by an inch by the motor _M4 .

(4) After repeating the above-mentioned operations of weighting and inching, after a predetermined time has elapsed for finishing the weighting, the work table 22 is moved back by the operation of the air cylinder _L1 , and the finished case 9 after the weighting is separated from the grinding belt B. ,
The operation of motor M ₄ is stopped. On the other hand, when the table 21 reaches the rear end, the motor _M3 stops the inching rotation, and the left/right movement air cylinder _L2 operates in the opposite direction to move the work table 22 to the left end, and the work head table 24 returns to its original position. Return to position. At this point, the finished case 9 is removed and a new case 9 is attached to the chuck 12.

(5) Repeat the above cycle.

The above is a description of the process performed by the apparatus of the present invention.

As another embodiment, instead of the contact rollers A43 and B46 of the grinding belts A and B, as shown in FIG.
6 or a flat platen 54 as shown in FIG. The former is convenient for grinding fine curved surfaces, and the latter is convenient for grinding flat surfaces.

The above explanation has been based on the embodiments, but specific points such as the number of grinding belts, the method of reciprocating the work head table from side to side, the number of belts to be inched or stopped, and the method of inching and stopping are not explained in the above embodiments. Not limited to those listed in.

For example, in this example, motor _M4 is used for continuous rotation and inching, but one additional motor is provided, and continuous rotation and inching are performed by separate motors, and the belt is changed according to the required operation. It is also possible to apply it to the grinding belt.

The present invention described above has the following effects.

(1) By mechanizing manual work that relies on experience and intuition, it is possible to improve the shape, precision, and yield of products.

(2) Items with uniform shapes can be mass-produced, labor can be saved through automation, and costs can be reduced.

(3) Since it is an automated device that is equipped with a plurality of different types of grinding belts and has different operating modes, the processing cycle can be shortened, efficiency is high, and the number of grinding devices can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a mechanism for rotationally driving the workpiece holding device shown in FIG. 1, and FIG. 3 is a view showing the grinding belt drive mechanism shown in FIG. 4 is a block diagram showing an embodiment of the present invention, FIG. 5 is a side view of a main part showing another embodiment of the invention, and FIG. 6 is a main part showing another embodiment of the invention. FIG. DESCRIPTION OF SYMBOLS 1... Grinding belt drive mechanism part, 2... Case drive mechanism part, 3... Case holding device, 4... Rotation and copying mechanism, 6... Case moving mechanism, 7... Case drive mechanism part moving mechanism, 8 ……Control device.

Claims (1)

[Claims] 1. A belt grinding device for grinding a wristwatch case, comprising: a grinding belt drive mechanism section having two grinding belts with different grain sizes and a drive mechanism that provides two types of drive modes to at least one of the grinding belts; , a rotation mechanism for rotating the case, a copying mechanism for cooperating with the rotation to cause the case to perform a copying motion, and a moving mechanism for moving the case between the two grinding belts; A belt grinding device for processing a wristwatch case, comprising: a case drive mechanism that moves so as to bring the case into contact and enable grinding; and a control device that controls the operation of each of the mechanisms.