CN218735277U - Light source structure and plug-in device - Google Patents

Abstract

The utility model belongs to the technical field of plug-in components machine, a light source structure and plug-in components device is related to, this light source structure includes frame and a plurality of light source, set up on the frame and dodge the through-hole, dodge the through-hole and be used for supplying the plug-in components module of external equipment to wear to establish, the light source install in dodge on the internal perisporium of through-hole; when the electronic component is located in the avoiding through hole, the light source emits light rays towards the avoiding through hole so as to illuminate the pin of the electronic component. Obviously, this light source structure can concentrate on most light in dodging the through-hole through above-mentioned structure, concentrates on electronic components's pin promptly to reduce dispersing of light to a great extent, reach the effect of polishing of preferred to electronic components's pin, and obtain clearer image, the accurate control plug-in components device work of being convenient for improves plug-in components device's work efficiency and plug-in components quality.

Description

Light source structure and plug-in device

Technical Field

The utility model relates to a plug-in components machine technical field especially relates to a light source structure and plug-in components device.

Background

An automatic component inserter is a processing device that inserts various electronic components to a designated position of a PCB (Printed Circuit Board). Electronic components generally include a main body and a plurality of pins, and the PCB board is provided with a plurality of jacks corresponding to the pins of the electronic components.

However, in the process of grabbing and plugging in the existing plug-in machine, pins of electronic components can shift, which affects the accuracy of the plug-in machine, and although related plug-in machines exist, the conditions of pin positions, angles and the like of the electronic components are identified through a light source structure, the problems of large light source irradiation range and unsatisfactory lighting effect still exist, so that interference can be caused to a camera for collecting pin images of the electronic components, and the working efficiency and quality of the plug-in machine are affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at, the light source structure of solving current plug-in components machine is polished the effect not good, and leads to the not clear technical problem of electronic components image of gathering.

In order to solve the technical problem, an embodiment of the utility model provides a light source structure has adopted following technical scheme:

the light source structure comprises a base and a plurality of light sources, wherein an avoiding through hole is formed in the base and is used for a plug-in module of external equipment to penetrate through, and the light sources are arranged on the inner peripheral wall of the avoiding through hole;

when the electronic component is located in the avoiding through hole, the light source emits light towards the avoiding through hole so as to illuminate the pin of the electronic component.

Further, in a preferable scheme of some embodiments, the inner peripheral wall of the avoiding through hole is provided with a plurality of mounting portions for mounting the light source, and the mounting portions are arranged at intervals along the length direction of the avoiding through hole.

Further, in a preferable scheme of some embodiments, the mounting portion includes a first mounting hole, a second mounting hole and a third mounting hole, and a central axis of the first mounting hole is perpendicular to a central axis of the avoiding through hole;

in the length direction of the avoidance through hole, the second mounting hole and the third mounting hole are respectively located on two sides of the first mounting hole, and included angles of the second mounting hole and the third mounting hole are arranged with the first mounting hole.

Further, in some embodiments, the included angle is in the range of 20 ° to 30 °.

Further, in a preferable scheme of some embodiments, the light source structure further includes a circuit board, an accommodating groove with an opening is formed in an outer peripheral wall of the avoiding through hole, and the circuit board is mounted in the accommodating groove;

the first mounting hole, the second mounting hole and the third mounting hole are communicated with the accommodating groove, so that the light source is electrically connected with the circuit board.

Further, in a preferable scheme of some embodiments, the light source structure further includes a protection plate, and the protection plate is disposed on the outer peripheral wall of the avoiding through hole to close the opening of the receiving groove.

Further, in a preferred version of some embodiments, the light source is a laser lamp.

In order to solve the above technical problem, an embodiment of the present invention further provides a plug-in device, which adopts the following technical solution: the plug-in device comprises:

a substrate mounted on an external device;

the driving assembly is vertically arranged on the base plate;

the clamping jaw assembly is mounted on the substrate and is in transmission connection with the driving assembly so as to move under the driving of the driving assembly and insert the electronic component on the target mounting plate;

the camera shooting assembly comprises a MARK point camera and a CCD camera, the MARK point camera is installed on the substrate, and a lens of the MARK point camera faces the target installation plate and is used for visually shooting MARK points;

the CCD camera is arranged on external equipment, and a lens of the CCD camera faces the clamping jaw assembly so as to photograph the electronic component after the clamping jaw assembly clamps the electronic component; and

in the light source structure, the light source structure is mounted at the bottom end of the substrate and used for providing a line light source for irradiating the pins of the electronic component.

Further, in a preferable scheme of some embodiments, the driving assembly includes a first driving module and a second driving module, the first driving module is configured to drive the jaw assembly to move toward or away from the electronic component, and the second driving module is configured to drive the jaw assembly to rotate around a central axis of the jaw assembly.

Further, in a preferred version of some embodiments, the number of first drive modules is the same as the number of jaw assemblies.

Compared with the prior art, the embodiment of the utility model provides a pair of light source structure and plug-in components device mainly has following beneficial effect:

this light source structure is through installing a plurality of light sources on dodging the internal perisporium of through-hole to when making when electronic components be located dodging the through-hole, a plurality of light sources homoenergetic are dodged the through-hole and are jetted out light, in order to illuminate electronic components's pin. It should be noted that most of light can be concentrated in avoiding the through holes, namely on the pins of the electronic components through the structure, so that the divergence of the light is reduced to a greater extent, the pins of the electronic components are polished better, a clearer image is obtained, the work of the plug-in device is controlled accurately, and the work efficiency and the plug-in quality of the plug-in device are improved.

Drawings

In order to illustrate the solution of the present invention more clearly, the drawings needed for describing the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

fig. 1 is a schematic perspective view of a light source structure according to an embodiment of the present invention;

FIG. 2 is an exploded view of the light source structure of FIG. 1;

FIG. 3 is a schematic view of the arrangement of the light source mounting location of FIG. 1;

FIG. 4 is a schematic perspective view of the housing of FIG. 2;

fig. 5 is a schematic perspective view of an insertion device according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of the insert device of FIG. 5 at another angle;

FIG. 7 is an exploded view of the insert assembly of FIG. 5;

fig. 8 is an exploded view of the first driving module shown in fig. 7.

The reference numbers in the drawings are as follows:

1. a plug-in device;

100. a light source structure; 110. a machine base; 111. avoiding the through hole; 112. an installation part; 1121. a first mounting hole; 1122. a second mounting hole; 1123. a third mounting hole; 113. a top plate; 114. a base plate; 115. accommodating grooves; 120. a light source/laser light; 130. a protection plate;

200. a substrate;

300. a drive assembly; 310. a first driving module; 311. a slide rail; 312. a slider; 313. a first synchronization belt; 314. a first motor; 320. a second driving module;

400. a jaw assembly;

500. a photographing component; 510. MARK point camera.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, for example, the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or position illustrated in the drawings, which are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The meaning of "plurality" is two or more unless specifically limited otherwise.

In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

An embodiment of the present invention provides a light source structure 100, as shown in fig. 1 and fig. 2, the light source structure 100 includes a base 110 and a plurality of light sources 120. The base 110 is provided with an avoiding through hole 111, and the avoiding through hole 111 is used for a plug-in module (not shown) of an external device to penetrate through. Specifically, in the present embodiment, the base 110 includes a top plate 113 and two bottom plates 114, the avoiding through hole 111 is opened on the top plate 113, and both the two bottom plates 114 are fastened to the top plate 113.

As can be appreciated, when the external device takes the material, the plug-in module of the external device grabs the electronic component (not shown) through the avoiding through hole 111, and after the electronic component is grabbed, the plug-in module returns to the initial position; when the external device is plugged in, the plug-in module of the external device passes through the escape through hole 111, and the electronic component is inserted into a designated position of a PCB (not shown), and then returns to the initial position.

In addition, the light source 120 is installed on the inner peripheral wall of the avoiding through hole 111, and when the electronic component is located in the avoiding through hole 111, the light source 120 emits light toward the avoiding through hole 111 to illuminate the pin of the electronic component. Understandably, when the plug-in module of the external device passes through the avoiding through hole 111 to grab the electronic component, and returns to the initial position, the pin of the electronic component is positioned in the avoiding through hole 111, at the moment, the plurality of light sources 120 emit light towards the avoiding through hole 111, wherein most of the light irradiates on the pin of the electronic component, so that the better illuminating effect is achieved, and the image photographed by the electronic component is clearer.

In summary, compared with the prior art, the light source structure 100 at least has the following beneficial effects: the light source structure 100 is configured to mount the plurality of light sources 120 on the inner peripheral wall of the avoiding through hole 111, so that when the electronic component is located in the avoiding through hole 111, the plurality of light sources 120 can emit light toward the avoiding through hole 111 to illuminate the pins of the electronic component. It should be noted that, most of light rays can be concentrated in the avoiding through hole 111, that is, on the pins of the electronic component, so that the divergence of the light rays is reduced to a greater extent, the pins of the electronic component are polished better, a clearer image is obtained, the operation of the plug-in device 1 is controlled accurately, and the work efficiency and the plug-in quality of the plug-in device 1 are improved.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 8.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 1, fig. 2 and fig. 4, the inner peripheral wall of the avoiding through hole 111 is provided with a plurality of mounting portions 112 for mounting the light source 120, and the mounting portions 112 are disposed at intervals along the length direction of the avoiding through hole 111.

It should be noted that the width of the space is determined by the distance between the plurality of card modules of the external device. In detail, the position of the mounting portion 112 corresponds to the position of the plug-in module of the external device, so that after each plug-in module clamps the electronic component, the light source 120 can accurately irradiate on the pins of the electronic component clamped by each plug-in module, and the pins of the electronic component can be polished better, thereby obtaining a clearer image.

Further, as a specific embodiment of the light source structure 100 provided by the present invention, as shown in fig. 3 and fig. 4, in order to enable the light source 120 to achieve a better irradiation range and irradiation effect, the mounting portion 112 includes a first mounting hole 1121, a second mounting hole 1122, and a third mounting hole 1123, and a central axis of the first mounting hole 1121 is perpendicular to a central axis of the avoiding through hole 111. In the length direction of the avoidance through hole 111, the second mounting hole 1122 and the third mounting hole 1123 are respectively located at two sides of the first mounting hole 1121, and the second mounting hole 1122 and the third mounting hole 1123 are arranged at an included angle with the first mounting hole 1121.

It can be understood that the plurality of light sources 120 are respectively installed in the first installation hole 1121, the second installation hole 1122 and the third installation hole 1123, when the light sources 120 emit light toward the avoiding through hole 111, because the second installation hole 1122 and the third installation hole 1123 are both arranged at an included angle with the first installation hole 1121, the light sources 120 in the first installation hole 1121, the second installation hole 1122 and the third installation hole 1123 emit light in a divergent manner, and the emission range of the light sources 120 is larger, thereby achieving a better illumination effect on the pins of the electronic components.

Further, as a specific embodiment of the light source structure 100 provided by the present invention, as shown in fig. 3, the included angle a ranges from 20 ° to 30 °, so that the problem of dispersion of light emitted from the light source 120 and reduction of brightness due to an excessively large included angle a range can be avoided; secondly, the problem that the pins of the electronic components are not irradiated by light due to the fact that light emitted by the light source 120 is overlapped and too concentrated due to the fact that the range of the included angle a is too small can be avoided.

In this embodiment, preferably, the included angle a is 25 ° to achieve a better polishing effect of the light source 120 on the pins of the electronic component, so as to obtain a clear image, facilitate accurate control of the operation of the plug-in device 1, and improve the work efficiency and the plug-in quality of the plug-in device 1.

Further, as a specific embodiment of the light source structure 100 provided by the present invention, as shown in fig. 1, fig. 2 and fig. 4, the light source structure 100 further includes a circuit board (not shown), the outer peripheral wall of the avoiding through hole 111 is provided with an accommodating groove 115 having an opening (not shown), the circuit board is installed in the accommodating groove 115, wherein the first mounting hole 1121, the second mounting hole 1122 and the third mounting hole 1123 are all communicated with the accommodating groove 115, so that the light source 120 is electrically connected to the circuit board.

Further, as the utility model provides a light source structure 100's a specific implementation way, for the protection circuit board, prolong its life, light source structure 100 still includes protection shield 130, and protection shield 130 lid is located and is dodged the periphery wall of through-hole 111 to seal holding tank 115's opening. Specifically, in the present embodiment, the protection plate 130 is fastened and connected to the outer peripheral wall of the escape through hole 111 by a fastener (specifically, a screw member such as a screw or a screw).

As can be appreciated, on one hand, when the light source structure 100 is impacted by external force, the protection plate 130 can be firstly acted by external force to prevent the circuit board from being damaged by the external force; on the other hand, the protection plate 130 can prevent foreign objects from falling into the accommodation groove 115.

Of course, in other embodiments, the protection plate 130 may be mounted on the outer peripheral wall of the avoiding through hole 111 by using a fixing connection manner such as bonding or clamping, which is not limited by the present invention and can be selected by those skilled in the art according to actual situations.

In the present embodiment, the light source 120 is preferably a laser lamp. It should be noted that the laser lamp 120 is a line light source for providing light to the pins of the electronic components, and the light emitted from the line light source is more concentrated and less prone to be diffused compared to a surface light source, so that most of the light is concentrated in the avoiding through hole 111, i.e., on the pins of the electronic components, and thus a better polishing effect on the pins of the electronic components is achieved, and a clearer image is obtained. Therefore, the plug-in device 1 can acquire clear pin images of the electronic components and filter other background features to realize accurate positioning of the pins of the electronic components, so that plug-in errors can be reduced, and the plug-in precision of the plug-in device 1 is ensured.

Based on the light source structure 100, the embodiment of the present invention further provides a plug-in device 1, wherein, as shown in fig. 5 to fig. 7, the plug-in device 1 includes a substrate 200, a driving assembly 300, at least one clamping jaw assembly 400, a photographing assembly 500, and the light source structure 100. In which the substrate 200 is mounted on an external device (not shown) to ensure the stability of the entire card device 1. It should be noted that the substrate 200 can move under the action of an external force to drive the whole card device 1 to move, so that the card device 1 can move back and forth between the material taking area and the plugging area.

The driving assembly 300 and the clamping jaw assembly 400 are both mounted on the substrate 200, and the clamping jaw assembly 400 is in transmission connection with the driving assembly 300 so as to move under the driving of the driving assembly 300 and plug electronic components on the PCB. It can be understood that, when the card inserting device 1 takes the material, the driving assembly 300 drives the clamping jaw assembly 400 to move towards the direction close to the electronic component, so that the clamping jaw assembly 400 clamps the electronic component, and after the clamping jaw assembly 400 clamps the electronic component, the driving assembly 300 drives the clamping jaw assembly 400 to move towards the direction away from the electronic component, and returns to the initial position.

It should be noted that, when the PCB board to be plugged is placed in the external plugging area, and when an electronic component needs to be plugged in the PCB board, the substrate 200 moves under the action of an external force to drive the whole plugging device 1 to move to the plugging area, at this time, the clamping jaw assembly 400 clamps the electronic component and is located above the PCB board, and then, the clamping jaw assembly 400 is driven by the driving assembly 300 to repeat the above-mentioned approaching or separating operation, so as to plug the electronic component in the PCB board.

In addition, the photographing assembly 500 comprises a MARK point camera 510 and a CCD camera (not shown), the MARK point camera 510 is mounted on a surface of the substrate 200 facing away from the clamping jaw assembly 400, and a lens of the MARK point camera 510 faces the PCB for visually photographing the MARK point, so as to ensure that the card inserting apparatus 1 can accurately position the PCB. Wherein, the CCD camera is installed on external equipment, and the camera lens of CCD camera is towards clamping jaw assembly 400 to behind clamping jaw assembly 400 centre gripping electronic components, shoot electronic components.

In addition, as shown in fig. 5 to 7, the light source structure 100 is mounted at the bottom end of the substrate 200 for providing the line light source 120 for irradiating the pins of the electronic components. It should be noted that when the light source 120 assembly irradiates on the pins of the electronic component, the effect of illuminating the pins of the electronic component can be achieved, so that the light in the photographing area (not shown) is brighter, and a clearer image is obtained.

Understandably, before the card device 1 clamps the electronic component, the MARK point camera 510 performs visual shooting on the PCB, and then the card device clamps the electronic component at the card module, and in the process of moving to the PCB to be plugged, the CCD camera takes a picture of the electronic component clamped by the clamping jaw assembly 400, and at the same time, the light source structure 100 is turned on to irradiate on the pins of the electronic component, and finally, the card device 1 synchronously rotates and corrects the angle of the pins of the electronic component according to the shot image condition, or if the pins of the electronic component are found to be deformed or damaged according to the shot image, the pins can be directly thrown to a waste material area (not shown) and then perform the next step of card-in action.

Compared with the prior art, the plug-in device 1 has at least the following beneficial effects: by adopting the light source structure 100, the light source structure 100 is configured to mount the plurality of light sources 120 on the inner peripheral wall of the avoiding through hole 111, so that when the electronic component is located in the avoiding through hole 111, the plurality of light sources 120 can emit light toward the avoiding through hole 111 to illuminate the pins of the electronic component. It should be noted that, most of light rays can be concentrated in the avoiding through hole 111, that is, on the pins of the electronic component, so that the divergence of the light rays is reduced to a greater extent, the pins of the electronic component are polished better, a clearer image is obtained, the operation of the plug-in device 1 is controlled accurately, and the work efficiency and the plug-in quality of the plug-in device 1 are improved.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 7 and 8, the driving assembly 300 includes a first driving module 310 and a second driving module 320. Specifically, in the embodiment, the first driving module 310 and the second driving module 320 are disposed on the substrate, the first driving module 310 is fixedly connected to the clamping jaw assembly 400, and the second driving module 320 is rotatably connected to the clamping jaw assembly 400.

The first driving module 310 is configured to drive the clamping jaw assembly 400 to move towards a direction close to or away from the electronic component, so that the clamping jaw assembly 400 can clamp or plug the electronic component. In addition, the second driving module 320 is used for driving the clamping jaw assembly 400 to rotate around the central axis of the clamping jaw assembly 400, so that the plug-in device 1 can rotate and correct the angle of the pin of the electronic component according to the photographing condition.

In detail, as shown in fig. 7 and 8, the first driving module 310 includes a slide rail 311, a slider 312, a first synchronous belt 313 and a first motor 314, the slide rail 311 is vertically installed on the base plate 200, and the slider 312 is slidably connected to the slide rail 311 and fixedly connected to the clamping jaw assembly 400. The first motor 314 is installed on one side of the substrate 200 departing from the clamping jaw assembly 400, an output shaft of the first motor 314 extends out of the substrate 200, and the output shaft of the first motor 314 is in transmission connection with the sliding block 312 through the first synchronous belt 313, so that the first motor 314 can drive the clamping jaw assembly 400 to move towards or away from the electronic component along the sliding rail 311.

Further, as a specific embodiment of the apparatus provided by the present invention, the number of the first driving modules 310 is the same as that of the clamping jaw assemblies 400, so that each clamping jaw assembly 400 can operate independently.

Specifically, in the present embodiment, as can be seen from the above description, the number of the jaw assemblies 400 is four, so the number of the first driving modules 310 is also four, and the slide rail 311, the slide block 312, the first synchronous belt 313 and the first motor 314 in each first driving module 310 are mutually matched, so as to control the movement of the corresponding jaw assembly 400.

Therefore, on one hand, when one group of the first driving modules 310 and the corresponding clamping jaw assemblies 400 are in failure, other first driving modules 310 and the corresponding clamping jaw assemblies 400 can also work normally, so that the problem that the plug-in device 1 stops working is avoided, and production is guaranteed.

On the other hand, if the pins of the electronic components on the respective clamping jaw assemblies 400 are found to be deformed or damaged through the photographed images, the user can independently control the first driving module 310 corresponding to the clamping jaw assembly 400 to throw the damaged and deformed electronic components to the waste material area, so as to ensure the quality of the product after the plugging.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A light source structure is characterized by comprising a base and a plurality of light sources, wherein an avoiding through hole is formed in the base and is used for a plug-in module of external equipment to penetrate through, and the light sources are arranged on the inner peripheral wall of the avoiding through hole;

when the electronic component is located in the avoiding through hole, the light source emits light rays towards the avoiding through hole so as to illuminate the pin of the electronic component.

2. The light source structure according to claim 1, wherein the inner peripheral wall of the avoiding through hole is provided with a plurality of mounting parts for mounting the light source, and the mounting parts are arranged at intervals along the length direction of the avoiding through hole.

3. The light source structure according to claim 2, wherein the mounting portion includes a first mounting hole, a second mounting hole, and a third mounting hole, and a central axis of the first mounting hole is perpendicular to a central axis of the avoiding through hole;

in the length direction of the avoidance through hole, the second mounting hole and the third mounting hole are respectively located on two sides of the first mounting hole, and the second mounting hole and the third mounting hole are arranged at included angles with the first mounting hole.

4. A light source structure according to claim 3, characterized in that said included angle is in the range of 20 ° to 30 °.

5. The light source structure of claim 3, further comprising a circuit board, wherein a receiving groove having an opening is formed on the outer peripheral wall of the avoiding through hole, and the circuit board is mounted in the receiving groove;

the first mounting hole, the second mounting hole and the third mounting hole are communicated with the accommodating groove, so that the light source is electrically connected with the circuit board.

6. The light source structure of claim 5, further comprising a protection plate covering the peripheral wall of the avoiding through hole to close the opening of the receiving groove.

7. A light source arrangement according to any one of claims 1 to 6, wherein the light source is a laser lamp.

8. A card device, comprising:

a substrate mounted on an external device;

the driving assembly is vertically arranged on the base plate;

the clamping jaw assembly is mounted on the substrate and is in transmission connection with the driving assembly so as to move under the driving of the driving assembly and insert the electronic component on the target mounting plate;

the camera shooting assembly comprises a MARK point camera and a CCD camera, the MARK point camera is installed on the substrate, and a lens of the MARK point camera faces the target installation plate and is used for visually shooting MARK points;

the CCD camera is arranged on external equipment, and a lens of the CCD camera faces the clamping jaw assembly so as to photograph the electronic component after the clamping jaw assembly clamps the electronic component; and

the light source structure of any one of claims 1 to 7, mounted at a bottom end of the substrate for providing a line light source for illuminating pins of an electronic component.

9. The card assembly device according to claim 8, wherein the driving assembly includes a first driving module and a second driving module, the first driving module is configured to drive the clamping jaw assembly to move toward or away from the electronic component, and the second driving module is configured to drive the clamping jaw assembly to rotate around the central axis of the clamping jaw assembly.

10. An inserter device according to claim 9, wherein the number of first drive modules is the same as the number of jaw assemblies.

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