JPH0354814Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pearl holder used when drilling holes in pearls.

[Conventional technology]

When drilling pearls, the first step is to examine the shape and luster of the pearl.
After the worker observes the ridges or scratches on the surface and other internal dirt, etc. and determines the best drilling position, the worker holds the pearl in a chuck, and then inserts a drilling awl into this selection point. The desired drilling operation is performed by applying this action.

In other words, in the conventional piercing work for pearls, for example, as shown in Japanese Utility Model Publication No. 7590/1983, the pearls with the determined piercing part are placed concentrically opposite each other on the left and right sides of the machine, and the levers are pressed up and down. The chucks were directly sandwiched between a pair of claw-shaped chucks that could be moved toward and away from each other by moving the chucks, and horizontally movable platforms installed on both sides of the chucks were then moved back and forth alternately to install the chucks at opposite front parts. The drilling work is performed using each drill.

[Problem that the invention attempts to solve]

By the way, in the conventional example described above, a pair of left and right chucks for holding a pearl are brought close to each other by operating a lever with one hand or foot, and the pearl is held in a predetermined position with the perforated part selected. , one person has to move the drilling drill forward and backward one after the other, which causes a lot of mental, physical and eye strain, and if this type of work continues for a long time, it becomes difficult to make decisions about the critical drilling position. This can lead to people neglecting to drill the holes incorrectly, which can lead to the loss of the value of valuable pearls.

Furthermore, since the above-mentioned pair of chucks each have a gripping portion in the form of a claw with three branches, even if the pearl-facing surface of each claw is formed in a spherical shape, the degree of clamping force may vary. This chuck has the disadvantage of damaging the pearl, and furthermore, this chuck has the disadvantage that the carefully selected perforation location is half covered by the left and right chucks, which tends to disturb the orientation of the selected location when pinching. There is.

Therefore, the present invention was developed so that the selection of the perforation part for each pearl, which requires skill, and the perforation work, which can be performed mechanically by any person, can be performed in separate processes, so that the perforation part of each pearl is exposed. It is an object of the present invention to enable skilled personnel to efficiently select the drilling position by providing a holder that independently accommodates and grips the holes.

[Means to solve the problem]

The pearl holder used for pearl piercing of the present invention has a holding hole for holding the pearl in the center of the main body case, which has a window hole with a diameter larger than the diameter of the pearl to be held on both sides of the center. , and a holder divided equally in the circumferential direction is housed by interposing a ring-shaped spacer with a hole in the center on both sides and an elastic member arranged around the outer periphery of the holder to keep the holder in a condensed state. It is characterized by being forced.

[Effect]

In the holder of the present invention, a number of holders each containing a large number of pearls with approximately similar diameters and a holder having a gripping hole slightly smaller than the diameter of these pearls are prepared, and then each of the pearls is inserted into the holder. shape and luster,
The position of the core part to be drilled is selected by taking into account scratches and other defects, and then the pearl is placed in the case by positioning this core part in the center of the gripping hole in the holder. When the holder is pressed into the holding hole through one of the window holes and the through hole of the spacer, the diameter of the holding hole of this holder becomes slightly smaller than the diameter of the target pearl, and the holder is circular. Since the holder is divided into several pieces in the circumferential direction, the holder expands the elastic member on the outer periphery outward and temporarily moves outward in the radial direction to hold the pearl in the holding hole. is inserted, and the pearl after insertion is held under strong pressure from the outer periphery via the holder due to the elastic restoring force of the elastic member.

For this reason, the pearl is held with reasonable force by a holder that is condensed with an elastic member, and in the center of the holder, with the diametrical perforation exposed through the windows on both sides. As a result, even an unskilled person can perform the subsequent drilling work easily and accurately.

[Example] Next, the present invention will be explained with reference to the example shown in the figure.
In Figures 1 and 2, reference numeral 1 denotes each circumferential side wall 3 of an outer case 3 and an inner case 4 so that a rectangular cavity 2 can be provided inside.
The box-shaped case body is formed by fitting the boxes 3 and 4 in an overlapping manner, and window holes 3b and 4b communicating with the cavity 2 are provided at the center of the opposing bottom surfaces of each of the boxes 3 and 4. 5 and 6 are ring-shaped spacers with smooth facing surfaces that are fitted into the cavity 2 so as to align with the opposing bottom surfaces of the case body 1, and the window hole 3b is provided in the center of both spacers 5 and 6. , 4b are provided, and between the spacers 5 and 6 is a hole for holding a pearl 7, which has a smaller diameter than the window holes 3b and 4b and the through holes 5a and 6a. A holder 9 formed around 8 and equally divided in the circumferential direction (in the illustrated example, divided into three equal parts) is interposed so as to maintain a condensed state by an elastic member 10 disposed around the holder.

The elastic member 10 pushes back the holder 9, which was pushed outward in the radial direction when the pearl 7 is press-fitted into the holding hole 8 of the holder 9 from one side, in the axial direction, and holds the pearl 7 in the holder 9. The elastic member 10 is shown as a soft ring functioning as a rubber spring in the figure, but it can also be made of a coil material wound into a circular shape. Alternatively, several springs capable of pressing the divided holder toward the axis may be individually arranged in a radial manner. In addition to having an arcuate cross-section, the inner circumferential surface of the gripping hole 8 may be formed into a V-shape as shown in the figure to ensure that the pearl can be held securely.

In the retainer of the present invention, a pre-selected perforation is inserted into the gripping hole 8 of the holder 9 through one window hole 3b of the case body 1 and the through hole 5a of the spacer 5. When the holder 9 is pushed in the axial direction so as to match the center position of the holder 8, the circumferentially divided holder 9 is pushed outward in the radial direction against the elasticity of the elastic member 10 located on the outer periphery. When the pearl is inserted into a predetermined position inside, the holder 9 is pushed back in the axial direction by the elastic restoring force of the elastic member.
The pearl is held with the perforations exposed through the window holes 3a and 3b on both sides of the case body 1 with a force that is not applied from the surroundings. Furthermore, the pearls can be easily taken out from the case body 1.

Next, an example of the structure and process for inserting and holding a pearl into the holder will be explained with reference to FIG.
Reference numeral 21 denotes a pedestal having a convex cross-section, the upper surface of which is a receiving part 22 of the pearl 7, and an air hole 24 in the axial center of the convex part 23.
is formed, and 25 is the above-mentioned pedestal 21.
It is a movable body disposed opposite to the upper part thereof coaxially with the retainer 1' of the present invention, and has a protruding retainer 26 on its lower surface which is concentric with the retainer 1' of the present invention and adsorbs it horizontally, and a cylindrical intake hole 27. is formed around the axis. The movable body 25 is designed to be movable between A' and A'' on the left and right sides with reference to the illustrated position A, and between a predetermined position below the A position close to the pedestal 21, and to move between the pedestal 21 and Air hole 2 in 21
4 is designed to be able to suck in external air at all times from above the receiving part 22, whereas the intake hole 27 in the other movable body 25 stops sucking air only when the movable body moves to the A'' position. , so that air can be taken in from the outside at all times except at the A″ position above. When the desired pearl 7 is placed on the receiving portion 22 of the pedestal 21 and the air intake from the air hole 24 is weakened, the movable body 25 moves from the A position to the A' position again. It returns to position B, then lowers toward the lower pedestal 21 for a predetermined distance, then rises to position A, and then moves back and forth between position A and position A''. This is done in such a way that the exercise can be performed automatically.

However, when the movable body 25 moves to the A' position,
If the separately prepared holder 1' is adsorbed into the holder 26, when a predetermined pearl 7 is placed on the receiving part 22 with the perforation section vertically defined as described above, the movable body 25 moves from A to A' to receive the holder, returns to A position shown in FIG. The pearl will be captured and held inside, and then it will rise to position A and then move to A'', where it will open the air intake hole 2.
7 stops, the retainer that has been adsorbed to the lower surface is separated and returns to position A, where it is once again ready for the next operation.

The pearls may be inserted into the holder by hand without using the device described above.

Next, although this is well known, the piercing means for the pearl 7 held in the holder will be explained with reference to FIG. A large number of recesses 32 are formed at equal intervals on the line, into which the holder 1' of the present invention holding the pearl 7 at a predetermined position is fitted in a restraining manner, and a hole 32' is provided at the center of the bottom. has been done. 33, 33' are one recess 3 when the table 31 is stopped.
A pair of perforators arranged so as to be able to move up and down on the same axis with respect to mount 3.
4 and 34', the required cone 3 rotates to the right, respectively.
A pressurizing plate 3 supports motors 36, 36' to which motors 5, 35' are attached, and is brought into parallel contact with the upper and lower surfaces of the table 31 by guide rods 37, 37' provided as a pair on the left and right sides of the motors, respectively.
8, 38' are equipped to be retracted against respective springs 39, 39', and the pressure plates 38,
It has a structure in which perforated chucks 40, 40' are protruded from the center of the facing surface of the pearl 7 to be press-fitted to the upper and lower exposed surfaces of the pearl 7.

Therefore, the frame 34 of each of the above-mentioned drilling machines 33, 33',
When the table 31 is stopped at a predetermined position, the chucks 34' approach each other from the upper and lower positions with respect to the pearls 7 in the retainer 1' fitted in the recess 32 of the table, so that the chucks 40 and 40' are first The pressure plates 38 and 38' are pressed against both sides of the table 31 while holding the pearl 7 from above and below, and the pedestal is also pressed against the spring 3.
By gradually compressing 9, 39', cone 35, 3
5' approaches and makes a hole in the pearl 7 from the upper and lower coaxial center portions. Just before this perforation reaches the middle of the pearl, the awl 35' stops and at the same time the lower pedestal 3
4' is moved back in the opposite direction, and the remaining hole is drilled by the advancement of the upper awl 35. Therefore, the pearls 7 held in the holder 1' with predetermined perforation locations can be perforated without any difficulty.

[Effect of idea]

When using the pearl holder of the present invention, instead of holding individual pearls directly with a chuck during piercing work as in the past, the pearls to be pierced are
Since the pearls can be held in the center of the case body while being exposed through the window holes provided on both sides of the case body, handling of processed pearls, especially during piercing operations, is facilitated. This prevents any deviation in the perforation position relative to the pearl.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the holder that captures the pearl in a desired position, Fig. 2 is a cross-sectional view of the center of the holder, and Fig. 3 is a structural diagram of the process for capturing the pearl in the holder. Front view, FIG. 4 is a partially cutaway front view of the pearl punching machine. 1 is a case body, 2 is a cavity, 3b and 4b are window holes, 5 and 6 are spacers, 5a and 6a are through holes, 8 is a gripping hole, 9 is a holder, and 10 is an elastic member.

Claims (1)

[Scope of utility model registration request] A holder with a holding hole for holding pearls in the center and equally divided in the circumferential direction is inserted into the cavity of the main body case, which has window holes with a diameter larger than the diameter of the pearl to be held on both sides of the center. A pearl for use in pearl piercing, characterized in that a ring-shaped spacer with a hole in the center is interposed on both sides, and an elastic member for keeping the holder in a condensed state is arranged around the outer periphery of the holder. retainer.