JPH0818179B2 - Method and device for removing dam burr of lead frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dam burr removing method and a dam removing device for a lead frame for destroying and removing burrs (dam burrs) generated in a lead frame in a molding process in an electronic component manufacturing process. .

[0002]

2. Description of the Related Art Generally, I
Functional elements such as C and capacitors are bonded (connected) to the lead frame by thermocompression bonding or ultrasonic pressure bonding.
Then, it is covered with (synthetic) resin such as epoxy resin and packed. The process of packing the functional element with resin is called a molding process.

In the molding process, molten resin is injected from the injection molding machine into the cavity under high pressure every shot. Here, in order to cover and pack the functional element without leaving bubbles or chips, it is necessary to inject a larger amount of resin than the cavity volume (packing capacity) between the mold cavity and the functional element.

The excessively supplied resin leaks from the cavity and solidifies to form burrs around the package. This kind of burrs is called dam burrs (also called junk).

The occurrence of dam burrs is unavoidable in injection molding, and in the past, the occurrence of dam burrs was not a serious problem.
Electronic parts with dam burrs are also used without any problems. However, recently, removal of dam burrs is required due to high integration of ICs and the like.

In the manufacturing process of electronic parts, a resin package is used.
Since it is necessary to punch out the cut functional element with a press and cut it from the lead frame, a method of punching and removing dam burrs at the same time in this step (cutting step) is generally adopted. According to this punching of the press, the dam burr can be removed in the cutting process without adding a special process for removing the dam burr.

[0007]

However, in such a punching method using a press, the shape of the press die is complicated for dam burr removal, and the press die is expensive. Further, as the shape becomes complicated, the press die wears hard, which makes maintenance difficult.

Therefore, instead of punching with a press,
Prior to the cutting step, a method is used in which abrasive particles are jetted together with water or air at high pressure. According to this method, a wide range of dam burrs can be quickly destroyed and removed.

However, a dam burr having a certain thickness or more remains after withstanding a jet flow, and in order to destroy such a dam burr, it is necessary to increase the injection pressure or lengthen the injection time. However, if exposed to a high-pressure jet for a long time, there is a risk that the package or the lead frame will be polished, the package will be cracked, or the lead frame will be bent. Therefore, the injection conditions are restricted and the dam burr cannot be removed sufficiently.

Further, a method of destroying dam burrs and removing them by jetting only water at high pressure without containing abrasive particles is also known. In this method, if the jet flow is made thin in order to increase the water pressure (injection pressure), the injection range becomes narrow and it becomes difficult to quickly remove the dam burr.

There is also known a method of irradiating with laser light to melt gas to remove dam burrs, and in this method, dam burs are relatively easily removed regardless of the thickness. However, since the molten gasified resin adheres to other parts of the lead frame, a post-process of cleaning the lead frame is added to complicate the process. A method is also known in which a rotary blade is formed on the side surface of the roller, the roller is rotated in synchronization with the feeding of the electronic component, and the dam burr on both side surfaces of the electronic component is removed by the rotary blade. However, most of recent electronic components are formed by connecting a functional element to a lead frame. A large number of cutouts are formed in the lead frame, and resin flows into the cutouts to generate dam burrs. The rotary blade on the side surface of the roller cannot enter the notch and cannot remove the dam burr from the notch of the lead frame.

The present invention provides a method for removing dam burrs in a lead frame and a dam burr removing apparatus for the same, which destroys and removes dam burrs without damaging the package and the lead frame without the need for a post process. It is an object.

[0013]

In order to achieve this object, according to the method for removing dam burrs of the present invention, a roller having a large number of projections on its peripheral surface has the projections notched in the lead frame. The dam burr inside the notch is destroyed and removed by rotating it while inserting it inside. The rotation of the roller is synchronized with the feed of the lead frame.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIG. 1, which is an overall perspective view, a dam burr removing apparatus 10 for the dam burr removing method of the present invention is shown.
Is a support table 12 on which a lead frame 11 (see FIG. 2) is conveyed, a feed mechanism 14 for the lead frame, and a breaking roller for breaking and removing dam burrs of the lead frame. And a feed mechanism and a drive source 18 for the breaking roller.

First, the lead frame 11 will be described. As shown in FIG. 2 which is an enlarged perspective view, for example, the lead frame is a resin package in which functional elements are sealed.
It has a long shape in which 11a is stacked on the upper and lower surfaces in the center, and a large number of notches 11b are provided to form a tie bar and a lead. Then, a series of pilot holes 11c are formed on both sides of the lead frame 11 at a predetermined pitch.
A hole 11d for discriminating between the front and the back is provided at the front end or the rear end of the frame.

Although not shown in order to avoid complication of the drawing, during molding of the package 11a, excessively supplied resin leaks from the mold cavity into the notch 11b and solidifies to form a dam burr. To be done.

As shown in FIG. 1 and FIG. 3 which is a partially enlarged view thereof, the support table 12 is formed with a guide groove 12a corresponding to the shape of the lead frame 11 on the upper surface thereof. −
The dframe is inserted into this guide groove and conveyed, for example, from the front left side in the figure to the right side as seen from the arrow. The support table 12 is horizontally provided on the base 13.

As shown in FIG. 1 and FIG. 4 which is a partial perspective view from below, the feed mechanism 14 of the lead frame is provided with a feed roller 20, the roller shaft 21 of which is a support table 12.
The bearing 22 and the flange 24 are interposed between the lower surface of the base and the vertical wall 13a of the base. The feed roller 20 is arranged so that a long hole 12b is formed in the support table 12 and a part thereof faces the support table through the long hole.

The feed roller 20 is formed in a spline shape having a series of guide pins 20a which are engaged with the pilot holes 11c of the lead frame from below at the outer edge of its peripheral surface. The guide pin 20a has an involute tooth shape (see FIG. 5). The feed roller 20 is rotated while the guide pin 20a is engaged with the pilot hole 11c of the lead frame from below, whereby the lead frame 11 is rotated.
Are fed at a predetermined pitch in the guide groove 12a of the support table.

In the embodiment, since the peripheral surface of the guide pin 20a has an involute tooth shape, the guide pin is provided with a lead frame.
Smoothly engages the pilot hole 11c of the
The dframe 11 can be sent accurately.

A holding lever (not shown) is provided on the support table 12 above the elongated hole 12b, and the holding lever is provided.
Holds the lead frame 11 lightly on the support table to prevent the lead frame from rising. Presser lever
Is sufficient to prevent the lead frame 11 from being lifted up. For example, one end of the lead frame 11 is pivotally supported on the support table 12 and the other end (free end) is lowered under the biasing force of a spring. The lead frame 11 is lightly pressed onto the upper surface of the support table by pushing.

The breaking roller 16 is formed with a large number of projections 16a and guide pins 16b on its peripheral surface. The projections are shaped to fit into the notches 11b of the lead frame, and the guide pins are Each of them is formed into a shape that can be engaged with the pilot hole 11c of the lead frame.

As can be seen from FIGS. 6 and 7 in addition to FIG. 1, in the embodiment, the breaking roller 16 is not an integral member but is formed by combining seven rollers. . That is, the rollers with protrusions 32, 3 on the left and right of the small-diameter center roller 31
Place two rollers 3, 34 and 35 on each side, and insert a roller (guide roller) 36 with a guide pin 16a on the outer side of the inner roller.
A press roller (side roller) 37 is arranged on the side.

The structure of the breaking roller 16 will be described in detail. As shown in FIG. 6, the sleeve 42 is put on the roller shaft 40 while the flanged portion 42a is in contact with the flange 40a of the roller shaft 40. And is positioned by the pin 43. Then, the rollers 37, 35, 34, 31, 33, 32, 36 are slid from the outside.
42 is installed in sequence, and key 3 is used to roll 3 on the roller shaft.
7, 35, 34, 31, 33, 32, 36 are non-rotatably mounted to define the mutual position of a series of rollers.

A bearing nut 46 is screwed onto a male screw (not shown) on the left end of the sleeve to press the rollers 31 to 37 against the flange 42a of the sleeve to position them axially. Further, a hexagon socket head cap screw 50 is screwed into a tap hole (not shown) at the outer end (right end) of the roller shaft with a collar 48 interposed, and the flange 40a of the roller shaft.
The sleeve 42 is axially positioned by pressing the sleeve 40 against the sleeve 42.

Left and right rollers 32, 33, 3 of the center roller 31
Protrusions 16a are provided on the peripheral surfaces of 4 and 35.
The shape corresponds to the cutout 11b of the dframe, and the cutout is
It is formed so as to fit into 11b and destroy and remove the dam burr in the notch. In the embodiment, since the breaking roller 16 is not an integral member but is divided, the lead frame 16
The projection 16a with a shape corresponding to the notch 11b
Can be accurately molded on the peripheral surface of la.

A guide roller 36, which is a roller at the outer end, is also provided.
Has a series of guide pins 16b integrally engaged with the pilot holes 11c of the lead frame from above on the outer edge of the peripheral surface. The guide pins are guide pins 20a of the feed roller.
Similarly, the tooth profile has an involute tooth profile (see FIG. 8). Since the peripheral surface of the guide pin 16b has an involute tooth shape, the guide pin 16b can be smoothly engaged with the pilot hole 11c of the lead frame without rattling, and the pilot hole is not damaged.

Still further, as shown in FIG. 6, the sleeve 52 is fixed to the base 13 by fixing the flange 52a to the vertical wall 13a of the base by means of the hexagon socket head bolt 54, and the sleeve 52 is fixed. The bearing (not shown) built into the
Ras shaft 40 is supported. The gear 56 is fixed to the roller shaft 40 by screwing a bolt into the tap hole of the boss 56a.

Reference numeral 57 indicates a bearing nut screwed to the male thread of the roller shaft 40. The bearing nut positions the roller shaft and the sleeve 52 via a washer and a color bearing. Are positioned

An axial blind hole 58a, which is a part of the flow path of the pressurized air, is formed in the roller shaft 40 from the left end,
A plug 60 with a conduit for pressurized air is screwed into a tap hole at the left end of the la shaft 40. Lateral hole 58 communicating with blind hole 58a
b is formed so as to penetrate through the peripheral surfaces of the roller shaft 40 and the sleeve 42, has a large diameter at the outer edge of the lateral hole, and has a radial groove 58c communicating with the lateral hole through the large diameter portion. -It is formed on both left and right sides of LA 31.

Further, as shown in FIG. 8, an annular groove 58d.
Are formed between the opposing rollers 34 and 35 and between the rollers 32 and 33, respectively, and communicate with the groove 58c. A gap 58e is formed between the rollers 32 and 33 facing each other so that the annular groove 58d communicates with the outside air. Similarly, the gap 58
e is formed between the rollers 34 and 35 to communicate the annular groove 58d with the outside air.

In such a structure, the flow path 58 communicating with the outside air through the gap 58e is formed by the holes 58a, 58b and the grooves 58c, 58d. Therefore, if the high pressure air is supplied by connecting the conduit of the plug 60 to the high pressure air supply source, the high pressure air will
Flow through the gap 58e between the rollers 34, 35 and the rollers 32, 3
It is ejected from the gap 58e of 3.

Drop holes 12c for dam burrs are formed in the support table 12 below the rollers 32 and 33 and below the rollers 34 and 35, respectively (see FIGS. 4, 6 and 8). .

Below the breaking roller 16, the reel is
In order to prevent the dframe 11 from rising out of the guide groove 12a of the support table, the holding plate 62 is attached to the support table 12a.
Is bolted to the upper surface of. As can be seen from FIGS. 3 and 8 in addition to FIG. 1, the holding plate 62 includes the pressing piece 62a.
It has a substantially L-shape with a tip at the tip, and this pressing piece lightly presses the edge of the lead frame 11 from the outside of the pilot hole 11c on the right side from above to lift the lead frame. To prevent.

As can be seen from FIG. 1, the drive source 18 for driving the lead frame feed mechanism 14 and the breaking roller 16 is a motor.
The motor 64 and the speed reducer 66 are attached to the vertical wall 13a of the base by a bracket 67. The output of the motor 64 is reduced by the reduction gear 66 to generate a gear 68.
Is transmitted to the roller shaft 40 of the breaking roller via the gear 56 meshed with the gear 68. And FIG.
As you can see, the rollers of destruction rollers 31 to 37 are
It is driven integrally with the Ra shaft 40.

Destruction roller 16, lead frame feed mechanism
14 is driven synchronously by the motor 64. Destruction
In order to transmit the driving force of the motor 64 from the roller 16 to the feed mechanism 14, in the embodiment, below the roller shaft 40 of the breaking roller and at the same height as the roller shaft 21 of the feed roller. An intermediate shaft (not shown) is pivotally supported on the vertical wall 13a of the base.

Then, the gear on the intermediate shaft is meshed with the gear 56 on the breaking roller side, and a timing belt is installed between the roller shaft 21 of the intermediate shaft and the feed roller to break the breaking roller. 16, the feed roller 20 of the feed mechanism 14 is synchronously driven.

Since the breaking roller 16 and the feed roller 20 are driven in synchronization with each other, both guide pins 16b and 20a are simultaneously engaged with the pilot holes 11c of the lead frame at positions separated from each other. The dframe 11 is delivered exactly at the predetermined pitch.

Destruction roller 16, lead frame feed mechanism
The configuration in which 14 is driven in synchronization is not limited to this, and various other configurations can be adopted.

The dam burr removing device 10 having the above structure is
It is operated by supplying high-pressure air from the pressurized air supply source to the conduit of the plug 64 while starting the 64, and the breaking roller 16 and the lead frame feed mechanism 14 are synchronized by the start-up of the motor. And be driven.

The pilot hole 11c on the side having the front and back discrimination hole 11d is set to the right and is re-inserted in the guide groove 12a of the supporting table.
Insert the frame 11 to guide the feed roller 20
20a is engaged with the pilot hole 11c of the lead frame,
The lead frame is sent at a predetermined pitch. Here, a presser lever (not shown) supports the lead frame 11.
Because it is lightly pressed on the bull, the lead frame is sent without floating.

Since the guide pin 20a of the feed roller 20 has an involute tooth shape, it smoothly engages with the circular pilot hole 11c of the lead frame without rattling.
11 is sent correctly. Moreover, the pilot hole 11c is not damaged.

The lead frame 11 is also fed by the guide roller 36 of the breaking roller 16 at the downstream side of the feed roller 20. That is, the guide pin 16b of the guide roller 36 that rotates in synchronization with the feed roller 20 is
Engage with pilot frame 11c
Giving feed to Mu 11. Guide pin of guide roller 36
Since 16b has an involute tooth profile, it can be smoothly engaged with the circular pilot hole 11c of the lead frame without rattling, and the pilot hole is not damaged.

In this way, a plurality of rollers 20, 36 that synchronize with each other are provided.
Since the feed is added at, the lead frame 11 can be accurately fed without causing slack. Also, the destruction
Near the la 16, the pressing piece 62a of the pressing plate 62 presses the edge of the lead frame 11 outside the pilot hole 11c to prevent the lead frame from floating.

The lead frame 11 is accurately delivered without floating, and the rollers 32 to 35 of the breaking roller are:
It is precisely synchronized with the feed roller 20 and rotates integrally with the guide roller 36. Therefore, the protrusions 16a of the rollers 32-35 are
Is accurately fitted in the notch 11b of the lead frame 11. By fitting the protrusion 16a into the notch 11b, the dam burr in the notch is scraped by the protrusion and destroyed to be removed.

In the present invention, the projections of the rollers 32, 33, 34, 35 are
The dam burr can be easily broken and removed only by forming 16a into a shape corresponding to the notch 11b of the lead frame 11 and rotating the roller in synchronization with the feed of the lead frame 11. And since the dam burrs are removed in a separate process from punching and cutting the lead frame by pressing, unlike the conventional method of removing dam burrs during punching by pressing,
In this invention, the shape of the press die is not complicated, and maintenance of the die is not complicated.

In conventional punching with a press, dam burrs cannot be removed unless the lead frame is stopped and the lead frame is stopped, and the removal work must be intermittent. On the other hand, in the present invention, since the protrusion 16a of the breaking roller 16 is continuously fitted in the notch 11b of the lead frame in progress, the lead frame is not fed. Up to dam burr can be removed. Therefore, dam burrs can be removed continuously and work efficiency is dramatically improved.

In the conventional method of removing dam burrs by injecting water or air alone or together with abrasive particles at a high pressure, the impact of the jet flow may cause cracks in the package or bending of the lead frame. There is. However,
In the present invention, dam burrs are removed from the lead frame without touching the lead frame 11 and the package 11a,
Since the impact force does not act, it may damage the package,
Do not bend the lead frame.

In the embodiment, since the breaking roller 16 is not a unitary body but is constituted by combining a plurality of rollers 31 to 37, the projection 16a of the breaking roller is provided with the lead frame 11. Can be accurately formed into a shape corresponding to the notch 11b. for that reason,
The dam burr can be reliably destroyed and removed without remaining in the notch 11b.

Since the breaking roller 16 and the feed roller 20 of the lead frame feeding mechanism are driven by the same drive source 18, the breaking roller is not complicated. Is accurately synchronized with the feed of the lead frame 11.

Further, the flow path 58 formed in the breaking roller 16
High-pressure air is blown out through the gaps between the rollers with protrusions 34 and 35 on the left and right of the center roller and the gaps with the rollers 32 and 33 with protrusions. Then, the drop hole 12c of the dam burr is provided on the support table 12 just below the rollers 34, 35 and the rollers 32, 33.
Is formed.

In this manner, the rollers 32, 33, 34, 35 eject the high pressure air to fit the projection 16a at the tip end into the notch 11b of the lead frame 11. Therefore, the dam burr destroyed by the protrusion 16a and removed from the notch 11b is
It is blown by high-pressure air and immediately falls through the drop hole 12c. Therefore, dam burrs do not adhere to and accumulate on the lead frame 11, and the break roller 16 does not become clogged.

Since the breaking roller 16 is composed of a plurality of rollers 31 to 37, not the one body, the flow passage 58 for the high pressure air can be easily secured. In the embodiment, the blind hole of the roller shaft 40
The high-pressure air flowing through the flow path 58 including the 58a, the lateral holes 58b, and the grooves 58c and 58d is ejected from the gap 58e. However, the destruction roller
16 blows out high-pressure air while notching the lead frame 11
It suffices that the dam burr is removed by fitting with c, and the flow path 58 of high-pressure air, the jetting position, etc. are not limited to those of the embodiment.

As shown in FIG. 4, if a dust collector 70 is provided on the lower surface of the support table 12 just below the drop hole 12c, dam burrs can be collected without scattering. In particular, the dust collector 70
By connecting the negative pressure source with 72 and sucking the dam burr to the dust collector 70 under a negative pressure, adhesion and accumulation of the dam burr on the lead frame 11 and clogging of the break roller 16 are surely prevented. .

Further, the dam burr destroyed from the notch 11b can be removed by spontaneous fall or by forced suction by negative pressure without adhering to or accumulating on other parts of the lead frame. Therefore, the method of the present invention can be carried out without a post-process such as cleaning of the lead frame.

The above-mentioned embodiments are intended to explain the present invention, and are not intended to limit the present invention at all, and all modifications and alterations within the technical scope of the present invention are also included in the present invention. It goes without saying that it will be done.

[0058]

As described above, the lead frame of the present invention is
According to the method for removing dam burr of the drum, the dam burr can be continuously removed while the lead frame is being fed, and the working efficiency is dramatically improved.

Since the impact force does not act on the lead frame and the package, dam burrs are destroyed and removed without damaging the package and the lead frame. Also, no post process is required.

Since the dam burrs are removed in a separate process from punching and cutting the lead frame by a press, the shape of the press die does not become complicated and maintenance of the die does not become complicated.

If the dam burr is removed while ejecting high-pressure air from the peripheral surface of the breaking roller, adhesion and accumulation of dam burr on the lead frame and clogging of the breaking roller can be sufficiently prevented. It

Further, according to the dam-flame removing device of the lead frame of the present invention, the above-mentioned removing method is accurately performed with a simple structure, and the dam burrs are surely destroyed and removed.

The destruction rollers are not a single body but a plurality of rollers.
If it is configured by combining the rollers, the protrusion of the destruction roller can be removed.
Can be accurately molded into a shape that corresponds to the cutout of the dframe.
Make sure to destroy the dam burr without leaving it in the notch,
Can be removed. Further, the flow path for the high-pressure air can be easily formed, and the dam burr removing device that breaks and removes the dam burr while ejecting the high-pressure air by the breaking roller can be configured without complicating the structure. The dam burr removing device surely removes the dam burr without adhering to or depositing on the lead frame.

If the peripheral surface of the guide pin on the peripheral surface of the breaking roller has an involute tooth shape, the guide pin is provided with a lead frame.
The synchronism of the break roller with respect to the feed of the lead frame can be accurately ensured by smoothly engaging the pilot hole of the frame without rattling.

Under the breaking roller, on the support table,
If a holding plate for preventing the floating of the dframe is provided, the projection of the breaking roller is accurately fitted into the notch of the lead frame, and the dam burr can be reliably broken and removed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a dam frame removing device for a lead frame according to the present invention.

FIG. 2 is an enlarged perspective view of a lead frame.

FIG. 3 is a partial perspective view of a support table near a breaking roller.

FIG. 4 is a partial perspective view of a support table seen from below.

FIG. 5 is an enlarged partial perspective view of a feed roller.

6 is an end view, partially broken, of the dam burr removal device taken along the line AA in FIG. 1 (however, the position of the high-pressure air plug is shown bent at 90 °).

FIG. 7 is a partial front view of the breaking roller near the center.

FIG. 8 is an enlarged view of a B part in FIG.

[Explanation of symbols]

10 Lead frame dam burr removal device 11 Lead frame 11a, 11b, 11c, 11d Lead frame package, notch, pilot hole, front / back discrimination hole 12 Support table 12a, 12b, 12c Support table guide groove, long hole, dam burr drop hole 13 Base 13a Base vertical wall 14 Lead frame feed mechanism 16 Break roller 16a Break roller peripheral surface Protrusion 16b Guide pin on the peripheral surface of the break roller 18 Drive source 20 Feed roller 20a Guide pin of the feed roller 31 to 37 Roller of the break roller 40 Roller shaft of the break roller 44 Key − 56 Gear 58 High pressure air flow path 60 High pressure air supply plug 62 Presser plate 62a Presser plate pressing piece 64 Motor 66 Speed reducer 68 Gear 70 Dust collector 72 Conduit to negative pressure source

Claims (9)

[Claims] 1. A roller having a large number of protrusions on its peripheral surface is relieved.
A method for removing dam burrs in a lead frame, which is rotated in synchronism with the feeding of the drape and the projection is fitted into the notch in the lead frame to destroy and remove the dam burr in the notch. 2. The method for removing dam burrs of a lead frame according to claim 1, wherein the dam bur is removed while ejecting high pressure air from the peripheral surface of the roller. 3. A feed mechanism of a lead frame for continuously feeding a lead frame on a support table, a plurality of guide pins engaged with pilot holes of the lead frame, and a lead. -A breaking roller having a large number of protrusions fitted on the notches of the frame and breaking the dam burrs in the notches on the peripheral surface and rotated in synchronization with the feed of the lead frame; A lead frame dam burr removing device comprising a feed mechanism and a drive source for driving a breaking roller. 4. A support table having a guide groove on its upper surface, which serves as a carrying path for the lead frame, and a lead frame provided in the support table and within the guide groove of the support table. Of the lead frame, a plurality of guide pins engaged with the pilot holes of the lead frame, and a dam burr in the notch of the lead frame. A breaking roller, which is provided on the support table with a large number of projections that break the inner surface of the support table and is rotated in synchronization with the feeding of the lead frame by the feeding mechanism, and the supporting table. It is provided with a lead frame feed mechanism,
The destruction roller comprises a drive source for driving the destruction roller, and the destruction roller is configured by arranging a plurality of rollers with protrusions on the left and right sides of a central roller having a small diameter. -A red frame dam burr removal device in which the feed mechanism of the drape frame and the breaking roller are driven in synchronization. 5. A flow path communicating with a pressurized air supply source is formed by interposing a roller shaft of a breaking roller, and a gap is formed between adjacent rollers with protrusions to communicate with the flow path. The dam burr removing device according to claim 4, wherein the dam burr is removed. 6. The lead frame according to claim 3, wherein a drop hole for dam burr is provided in the support table below the roller with projection, and a dust collector is provided under the drop hole. Dam burr removal device. 7. The dam burr removing device for a lead frame according to claim 6, wherein the dust collector is connected to a negative pressure source. 8. The dam burr removing device for a lead frame according to claim 3, wherein the peripheral surface of the guide pin of the breaking roller has an involute tooth shape. 9. A pressing plate for pressing from above the end of the lead frame on the side having the pilot hole with which the guide pin is engaged is provided on a supporting table below the breaking roller along the feeding direction. 9. The relief according to claim 3, which is provided.
Dough frame dam burr removal device.