TWM597979U - Limiting device of PCB frame clip bracket - Google Patents

Abstract

The present model provides a limit device for a PCB frame clamp bracket, which includes two clamp arms which are symmetrically arranged on both sides of a crossbar used as a fixed end in a symmetrical manner that can be swivelled relative to each other. A PCB accommodating slot is formed between the two spans and the cross bar. The PCB accommodating slot is relatively far away from the cross bar and has a PCB accommodating entrance. It has at least one clamped width H ₁ , two stoppers are symmetrically arranged on the cross bar, and the two clamp arms are respectively positioned at the PCB placement entrance to a temporary width H ₂ via the restraints of the two stoppers. The pause width H _{2 is} greater than the clamped width H _{1 of} the PCB, thereby improving the problem that the bracket that does not clamp the PCB touches the adjacent PCB during the movement.

Description

Limiting device of PCB frame clamp bracket

The new model relates to the structure technology of a PCB clamp, in particular to a limit device of a PCB frame clamp bracket.

Printed circuit board (PCB) in the manufacturing process usually goes through ink coating, drying, baking and other processes, and usually conveying equipment is used to carry the PCB through the work station of the above process one by one to improve Capacity.

In PCB conveying equipment, you can often see the use of clamps to clamp the end of the PCB, so that the PCB is clamped by the clamp in a suspended form, and the movable components such as conveyor chains or belts are used to drive the clamps to move, and then carry the The suspended PCB moves on the production line through the work station of the above process.

Taking the existing PCB baking equipment as an example, the continuous mobile type has been adopted to carry PCB into the tunnel oven for baking; for this reason, it is common to use a circularly movable conveyor line with fixtures (such as Taiwan Patent I225029), using this clamp to clamp a frame part of the PCB that is not covered with ink, so that a piece of PCB can be clamped by the clamp at intervals, and move into the oven in the form of spaced hanging on the conveyor line. bake.

Moreover, PCBs are generally quadrilateral thin plates, and their area specifications (that is, length and width dimensions) are large or small, and the board body has thickness. When the above-mentioned clamp is used to hang and transport the PCB through the oven, it is easy to cause the clamped PCB to shake, and the shaking phenomenon of the thinner PCB is more obvious.

Therefore, the industry usually increases the spacing configuration of the hanging fixtures on the PCB conveyor line in the oven to prevent the clamped PCB from moving during the baking process. Defects such as ink sticking due to shaking. When the distance between the hanging fixtures on the plate conveyor line in the oven is larger, the number of pieces of the hanging PCB that can be baked in the oven per unit time will be relatively restricted, which even hinders the improvement of PCB baking production capacity .

In order to solve this problem, the industry has developed a PCB frame clamp bracket and a method of using the bracket to carry the PCB as disclosed in the Taiwan Announcement No. I660655 Patent Case. The bracket is used to fix multiple ends of the quadrilateral PCB. It can prevent the PCB from shaking during the mobile baking process, thereby reducing the distance between the PCB and other PCBs during the mobile baking process, and effectively improving the baking capacity of the PCB.

However, in actual operation, not every bracket holds the PCB. As shown in Figures 1 and 2, the bracket 10a without the PCB is moved by the conveyor chain 50a. The clamping arm 12a of the bracket 10a is prone to shaking, and then touches the PCB 70a clamped on the adjacent bracket 10a, causing damage to the PCB 70a. Therefore, how to avoid clamping of the bracket 10a that does not clamp the PCB 70a The arm 12a touches the PCB 70a clamped on the adjacent bracket 10a during the movement, which becomes a subject to be improved.

In view of the problems in the prior art, the purpose of the present invention is to improve the problem that the clamping arm of the bracket that does not clamp the PCB touches the PCB clamped on the adjacent bracket during the movement.

To this end, a preferred embodiment of the present invention is to provide a limit device for the PCB frame clamp bracket. The specific technical means include: two clamp arms, which are symmetrically arranged relative to each other and used as a fixed end On both sides of the crossbar, a span is formed symmetrically on the two clamping arms, a PCB accommodating slot is formed between the two spans and the crossbar, and the PCB accommodating slot is relatively far away from the crossbar The end edge of the PCB has an entrance for the PCB, and the surrounding end edges of the PCB have at least one clamping width H ₁ ; and two stoppers are symmetrically arranged on the cross bar, and the two clamping arms pass through the two The limiter is constrained and positioned at the PCB entrance to a rest width H ₂ , and the rest width H _{2 is} greater than the clamping width H _{1 of} the PCB.

In a further implementation, the stopper has a guide surface and a stop surface, the guide surface receives the push of an arm of the clamp arm, and the stop surface is used to stop the arm and restrain The clamp arm. An included angle of less than 90 degrees is formed between the guide surface and the stop surface, and the guide surface is a slope surface inclined relative to the cross bar, and the stop surface is a relatively perpendicular to the cross bar. Vertical facade.

In a further implementation, the stopper is a reed, one end of the reed is fixed on the cross bar, the other end of the reed is suspended, and the guiding surface continues the stop surface to be integrally formed on the On the reed. The suspended end of the reed is located at the end of the stopping surface.

In a further implementation, the stopper is a pressing member, the pressing member is pivotally disposed on the cross bar, and a spiral compression spring is disposed between the pressing member and the cross bar.

In a further implementation, the stopper is a pusher, the pusher is pivotally arranged on the crossbar, and a spiral tension spring is arranged between the pusher and the crossbar.

In a further implementation, two elastic elements are symmetrically arranged on the two clamping arms, and the two elastic elements respectively drive the two clamping arms to rotate in opposite directions to clamp and shrink the PCB placement opening.

In a further implementation, the cross bar is arranged on a moving path to move the PCB. At least one pusher is respectively configured on both sides of the moving path, and the arm of the clamp arm is driven by the pusher to push against the guide surface of the stopper, and make the arm of the clamp arm The part accepts the stop of the stop surface to restrain the clamp arm, and the pusher drives the clamp arm to escape from the restraint of the stopper and reset. The pusher includes a limit pusher, and the arm of the clamp arm is driven by the limit pusher to push against the guide surface of the limiter, and make the arm of the clamp arm accept the The stop of the stop surface restrains the clamp arm. The pusher group also includes a limit-releasing pusher, and the limit-releasing pusher is used to drive the clamp arm to be released from the restraint of the limiter and reset.

In a further implementation, the moving path includes a picking end and an unloading end of the PCB, and the moving path extends through the inside of an oven, the picking end and the unloading end The loading ends are respectively exposed outside the oven, the moving path is formed around by a circularly movable conveyor chain, and the carriage is driven by the conveyor chain to pass the picking end and the unloading end along the moving path. Wherein the limit pusher is arranged at the capture end. The capture end is also equipped with a PCB detection component, and the limit pusher is controlled by the PCB detection component. The pusher also includes a material-feeding and clamping-opening pusher arranged at the capturing end. The pusher also includes a discharge-clamping pusher arranged at the unloading end. The moving path is composed of a first rotation path, a first linear path, a second rotation path, and a second linear path. The capture end is located in the first rotation path, and the unloading end is located in the first rotation path. In the two revolving trajectories, the carriage moves from the extraction end to the unloading end along the first linear track, and moves from the unloading end to the extraction end along the second linear track. The limit releasing pusher is arranged on the second straight track or the unloading end.

According to the above technical means, the technical effect of the present invention is that the bracket that does not clamp the PCB is kept open during the movement process by the restraint of the stopper, which can effectively avoid touching the phase. Adjacent to the PCB clamped on the bracket, causing scratches on the PCB to improve the processing quality of the PCB.

In addition, the relevant technical details on which the present invention can be implemented will be described in the subsequent implementation modes and drawings.

10a, 10b: bracket

101: PCB housing slot

102: PCB entry

11: Crossbar

111: Block

112: pole

12a, 12b: clamp arm

121: first arm

122: second arm

123: Pivot

124: Cross Department

13: Elastic element

20: Stopper

201: Guide Surface

202: stop surface

21: Reed

22: Press fastener

23: push piece

24: spiral compression spring

25: spiral tension spring

30: Pusher

31: Feeding and opening clamp pusher

32: Discharge open clamp pusher

33: limit pusher

34: Lift the limit pusher

41: PCB detection components

42: Stopper

50a, 50b: conveyor chain

51: moving path

511: The first trajectory

512: The first straight track

513: Second trajectory

514: Second straight track

52: capture side

53: Uninstaller

60: Oven

61: scroll wheel

62: Conveyor belt

70a, 70b: PCB

H ₁ : width of clamp

H ₂ : Respite width

Fig. 1 is a schematic diagram between a traditional bracket without a PCB and a bracket with a PCB.

Fig. 2 is a side view of Fig. 1.

Figure 3 is a front view of the new bracket.

Fig. 4 is a partial enlarged view of Fig. 3.

5 and 6 are schematic diagrams of different embodiments of the stopper.

Fig. 7 is a sectional view of the bracket of the present invention disposed inside the oven.

Fig. 8 is a plan view of Fig. 7.

Figure 9a to Figure 9b are the feed opening clamp pusher or the discharge opening clamp pusher driving the clamp arm Schematic diagram of the action at the time.

Figures 10a to 10b are schematic diagrams of actions when the limit pusher drives the clamp arm.

Figures 11a to 11b are schematic diagrams of actions when the limiter is driven by the limiter lifter.

First of all, please refer to FIGS. 3 and 4 together to reveal the aspect of a preferred embodiment of the present invention, and explain the limit device of the PCB frame clamp bracket provided by the present invention, including the PCB frame clamp bracket 10b And two limiter 20. among them:

The main structure of the PCB frame clamp bracket 10b includes a cross bar 11 and two clamp arms 12b, wherein the cross bar 11 is used as a fixed end, and the proximal section of the cross bar 11 is protrudingly provided with at least one supporting PCB 70b.板片-shaped stop 111. The two clamping arms 12b are symmetrically arranged on both sides of the crossbar 11, so that the blocking portion 111 is located between the two clamping arms 12b. A cross portion 124 for clamping the PCB 70b is symmetrically formed on the two clamping arms 12b. A PCB accommodating groove 101 is formed between the two cross portions 124 and the blocking portion 111, and the PCB accommodating groove 101 An end side relatively far away from the blocking portion 111 has a PCB insertion opening 102, so that the PCB 70 b can enter and exit the PCB receiving slot 101 through the PCB insertion opening 102.

In terms of specific implementation, please refer to FIG. 7, which illustrates that the PCB frame clamp brackets 10b are essentially multiple, and are connected in series on a moving path 51 in parallel at adjacent intervals; specifically, each bracket 10b is It is installed on the moving path 51 by virtue of the cross bar 11. More specifically, the moving path 51 includes a picking end 52 and an unloading end 53 of the PCB. The moving path 51 can be built in an oven 60 so that the moving path 51 extends through the inside of the oven 60 and causes the The capturing end 52 and the unloading end 53 of the moving path 51 are respectively exposed outside the oven 60, and serve as the PCB inlet and the discharge port of the oven 60; in addition, the moving path 51 can be implemented as two sides of the inside of the oven 60 The conveyor chain 50b can rotate in a loop, so that the carriage 10 can bridge the conveyor chains 50b on both sides of the oven 60, and is driven by the conveyor chain 50b along the picking end 52 and the unloading end of the moving path 51 Move in a circle between 53.

The moving path 51 is composed of a first turning path 511, a first straight The linear trajectory 512, a second revolving trajectory 513, and a second linear trajectory 514 are looped around. The capturing end 52 is located in the first revolving trajectory 511, the unloading end 53 is located in the second revolving trajectory 513, and the support The rack 10b moves along the second linear track 514 from the unloading end 53 to the picking end 52 to pick up the PCB 70b to be baked, and moves along the first linear track 512 from the picking end 52 to the unloading end 53 to unload the baked PCB. 70b. In addition, the oven 60 is pivotally provided with a plurality of rolling wheels 61 at the picking end 52, and the PCB 70b to be baked is carried by the rolling wheels 61 to the picking end 52. The oven 60 is provided with a conveyor belt 62 at the unloading end 53 inside, and the PCB 70b that has been baked is carried away from the unloading end 53 by the conveyor belt 62. The inside of the oven 60 is provided with a PCB detection element 41 on the extraction end, and the PCB detection element 41 detects whether the bracket 10b at the extraction end 52 currently clamps the PCB 70b.

Please refer to FIGS. 3 and 4 again to illustrate that a vertical rod 112 is protruded on both sides of the crossbar 11, a pivoting portion 123 is symmetrically formed on the two clamping arms 12b, and the two clamping arms 12b pass through the pivots respectively. The connecting portion 123 is pivotally connected to the vertical rod 112, and is pivotally connected to both sides of the cross rod 11 in a relatively swingable manner. Furthermore, the two clamping arms 12b respectively have a first arm 121 and a second arm 122. The span 124 is formed on the first arm 121, and the pivoting portion 123 is located on the first arm. Between the section 121 and the second arm section 122. The length of the first arm 121 is greater than the length of the second arm 122, so that the two clamping arms 12b can clamp PCBs of different sizes. The perimeter of the PCB 70b in the end side by at least one clip having a width of H _1, H ₁ of the receiving nip width is the width between the two holding PCB 70b 12b receiving the end edge of the clamp arm.

Two elastic elements 13 are symmetrically arranged on the two clamping arms 12b, and the two elastic elements 13 are used to drive the two clamping arms 12b to rotate and retract the PCB insertion opening 102 in opposite directions. Furthermore, the two elastic elements 13 are implemented as torsion springs, which are respectively arranged on the two pivoting portions 123, and the two ends of the two torsion springs respectively press the second arm portion 122 and the cross bar of the clamp arm 12b. The vertical rod 112 on the 11 causes the first arm 121 of the two clamping arms 12b to swing in a relatively close direction through the driving of the two elastic elements 13 respectively, thereby clamping and shrinking the PCB insertion opening 102.

The two stoppers 20 are symmetrically arranged on the cross bar 11 and are located on the swing path of the second arm 122, and the second stoppers 20 are used to restrain the two clamping arms 12b from being positioned at the PCB insertion entrance 102 To a rest width H ₂ , the rest width H ₂ is greater than the clamping width H _{1 of the} PCB 70b, which can effectively prevent the clamping arm 12b of the bracket 10b that does not clamp the PCB 70b from touching the adjacent The PCB 70b clamped on the bracket 10b. Furthermore, the stopper 20 has a guide surface 201 and a stop surface 202. The guide surface 201 is used for receiving the pushing and contact of the second arm portion 122 of the clamping arm 12b. The stop surface 202 is used for The clamping arm 12b is restrained by stopping the second arm portion 122; in specific implementation, an included angle of less than 90 degrees is formed between the guiding surface 201 and the stopping surface 202, and the guiding surface 201 is inclined relative to the cross bar 11 An inclined slope surface, the stop surface 202 is a vertical surface relatively perpendicular to the cross bar 11.

More specifically, the stopper 20 can be a reed 21 in implementation. One end of the reed 21 is fixed on the cross bar 11, the other end of the reed 21 is suspended, and the guiding surface 201 continues The stop surface 202 is integrally formed on the reed 21, the suspended end of the reed 21 is located at the end of the stop surface 202 in implementation, and the guide surface 201 is located on the fixed end and the suspended end of the reed 21 Between ends.

Please refer to Figures 5 and 6, which illustrate that the stopper 20 can be a pressing member 22. The pressing member 22 is pivotally arranged on the cross bar 11, and the pressing member 22 is connected to the cross bar 11 A spiral compression spring 24 (as shown in FIG. 5) is arranged between, so that the pressing member 22 can return to the original position by the elastic force of the spiral compression spring 24; the stopper 20 may be a pusher 23, which The push piece 23 is pivotally arranged on the cross bar 11, and a spiral tension spring 25 (as shown in FIG. 6) is arranged between the push piece 23 and the cross bar 11, so that the push piece 23 can be moved by The elastic force of the helical tension spring 25 returns to its original position.

The method of the present invention for driving the clamping arm 12b to open the clamping and accept the limit can not only rely on manual operation, but also can be performed with the help of an automated pusher 30. When performing automatic clamping and limiting, at least one pusher 30 is respectively configured on both sides of the moving path 51, and the pusher 30 can be used to perform actions including: driving the clamping arm 12b to open the PCB insertion opening 102 Clamping the PCB 70b, driving the clamping arm 12b that has clamped the PCB 70b to open the PCB insertion opening 102 and unloading the PCB 70b, driving the clamping arm 12b that has not clamped the PCB 70b to the stopper 20, and the driving is restricted to The clamp arm 12b on the stopper 20 that does not clamp the PCB 70b is reset (that is, out of the restraint of the stopper 20). The above actions can be performed by a single pusher 30 on the moving path 51 or by multiple pushers 30 on the moving path 51.

Please refer to FIG. 7, FIG. 8 and FIG. 9 a together to illustrate that the pusher 30 may include a pair of material feeding and clamping pushers 31 disposed on the capturing end 52. The feed opening and clamping pusher 31 is symmetrically arranged on the outer side of the two clamping arms 12b, and is used to drive the two clamping arms 12b to swing forward and elastically open the PCB insertion opening 102. The material feeding and clamping pusher 31 may be a pneumatic cylinder in implementation. Furthermore, the material-feeding and clamping-opening pusher 31 can respectively push the second arm portions 122 of the two clamping arms 12b (as shown in FIG. 9b), when the material-feeding and clamping-opening pusher 31 is applied to the second arm portion 122 When the thrust force is greater than the elastic force exerted by the two elastic elements 13 on the second arm portion 122, the first arm portion 121 of the two clamping arms 12b can respectively swing in a relatively distant direction, thereby opening the PCB insertion opening 102. In addition, when the feed opening and clamping pusher 31 releases the second arm portion 122, the first arm portions 121 of the two clamping arms 12b are respectively driven by the two elastic elements 13 to swing in a relatively approaching direction, thereby clamping and shrinking the PCB. Insert the entrance 102; wherein, the action of the material feeding and clamping pusher 31 in pushing and touching and releasing the second arm 122 are all performed at the capturing end 52. In addition, the picking end 52 is also equipped with two stoppers 42. The two stoppers 42 are symmetrically arranged on the outside of the two clamping arms 12b and adjacent to the PCB insertion opening 102; when the two clamping arms 12b pass through the feeding In order to prevent the two clamping arms 12b from contacting the stopper 20 due to the rotation of the clamping pusher 31 to open the PCB insertion opening 102, the two clamping arms can be restricted by the stop of the second stopper 42 12b rotation range.

Please continue to refer to Figures 7 and 8, which illustrate that the pusher can include a pair of discharging and opening pushers 32 configured at the unloading end 53, the pair of discharging and opening pushers 32 are also symmetrically arranged on the two clamping arms The outer side of 12b, and can be a pneumatic cylinder, whose function is to drive the two clamping arms 12b that have clamped the PCB 70b to elastically open the PCB insertion opening 102 in a positive direction, so that manual or automatic tools can take out the PCB at the unloading end 53. The PCB 70b in the frame clip bracket 10b.

Please refer to FIG. 7, FIG. 8 and FIG. 10a together, which illustrate that the pusher may include a pair of limit pushers 33 disposed on the capture end 52, and the limit pushers 33 It is symmetrically arranged on the moving path 51 at the rear end of the feed opening and clamping pusher 31, and is located on the outside of the two clamping arms 12b, and can respectively drive the two clamping arms 12b to swing in the positive direction to elastically open the PCB insertion opening 102 and accept The restraint of the stopper 20 (as shown in FIG. 10b) is therefore different from the function of the feed opening and clamping pusher 31 which is used to push the clamping arm 12b to open the PCB insertion opening 102 to clamp the PCB 90b. However, in further implementation, the feeding and clamping pusher 31 and the limit pusher 33 can also be driven by the same pair of pushers 30 with different driving strokes to push the clamping arm 12b to open the PCB insertion port 102 to clamp the PCB 70b. The movement and the movement of opening the PCB into the entrance 102 but not clamping the PCB 70b by the clamping arm 12b directly receiving the restraint of the stopper 20 are all within the technical scope of the present invention.

Please refer to FIGS. 7, 8 and 11a together, which illustrate that the pusher may also include a pair of limit-releasing pushers 34 arranged on the second linear track 514, and the pair of limit-releasing pushers 34 are symmetrically arranged in The outer sides of the two stoppers 20 are used to respectively drive the stoppers 20 to release the two clamping arms 12b (as shown in FIG. 11b), so that the two clamping arms 12b elastically clamp the PCB insertion opening 102 in a reverse swing. The limit release pusher 34 may be a pneumatic cylinder in implementation. Furthermore, the release limit pusher 34 can push the guide surface 201 of the limiter 20, so that the limiter 20 is properly offset, and then the second arm 122 of the second clamp arm 12b is released to make the clamp arm 12b The first arm portions 121 of each are driven by the elastic element 13 to swing in a relatively close direction, and then return to the original state of clamping and shrinking the PCB insertion opening 102.

In addition, the position of the release limit pusher 34 can also be changed, that is, the release limit pusher 34 is installed on the unloading end 53 to replace the discharge clamp opening pusher 32, so that the release limit pusher 34 can The unloading end 53 performs a reset action to release the limit for the clamp arm 12b that has not clamped the PCB and has been restrained by the limiter 20, and the unloading end 53 can also be used for the unloading end 53 to clamp the PCB and not receive it. The clamping arm 12b restrained by the stopper 20 performs the action of opening the PCB insertion opening 102, so as to take out the PCB 70b in the frame clamping bracket 10b.

According to the above configuration, please refer to FIGS. 7 and 8 together to illustrate that when the carriage 10b is moved to the picking end 52 by the conveyor chain 50b, the carriage 10b The PCB insertion opening 102 is opened by the driving of the feed opening clamp pusher 31. Then, the PCB 70b is carried by the rolling wheel 61 and enters the PCB accommodating slot 101 through the PCB insertion opening 102. When the end edge of the PCB 70b touches the stop 111, the feed opening and clamping pusher 31 releases the two clamping arms 12b, so that the two clamping arms 12b can respectively be driven by the elastic element 13 to swing in a relatively approaching direction The PCB insertion opening 102 is clamped and retracted, so that the two clamping arms 12b clamp the PCB 70b. Immediately, the PCB detection component 41 on the capture end 52 detects whether the bracket 10b currently clamps the PCB 70b at the capture end 52. If the bracket 10b does not clamp the PCB 70b, the limit pusher 33 is activated. , By the driving of the limit pusher 33, the bracket 10b is restrained by the limiter 20 and maintained in the state of opening the PCB insertion opening 102; on the contrary, if the bracket 10b of the picking end 52 clamps the PCB 70b, the limit pusher 33 does not act. Then, when the bracket 10b clamps the PCB 70b and moves to the unloading end 53, the discharging opening and clamping pusher 32 on the unloading end 53 drives the two clamping arms 12b to open the PCB insertion opening 102 to facilitate the self-supporting of the PCB 70b The rack 10b is taken out and unloaded on the conveyor belt 62, and then the discharging opening and clamping pusher 32 is released, so that the two clamping arms 12b are reset to the original state of clamping and shrinking the PCB insertion opening 102. Alternatively, when the discharging opening and clamping pusher 32 drives the two clamping arms 12b to open the PCB insertion opening 102, the two clamping arms 12b can also be restrained by the stopper 20 and maintained in the state of opening the PCB insertion opening; subsequently, When the restricted carriage 10b moves to the capturing end 52 along the second linear track 514, the restrictor 20 is released by the driving of the releasing pusher 34 on the second linear track 514. The clamping arm 12b returns to the reset state, so that the picking end 52 can be pushed again to pick up the PCB 70b again.

In the above implementation, the conveyor chain 50b is only an example. In essence, the elements equivalent to the conveyor chain 50b include conveyor belts or other transmission parts that can drive the carriage 10b to move on the moving path 51. The conveying chain 50b defined in the claim provides an equal explanation. In addition, the present model cannot be understood as a limitation to the scope of the present model due to the above-mentioned embodiments. Therefore, this new model should be subject to the content of the claims defined in the scope of the patent application.

10b: bracket

101: PCB housing slot

102: PCB entry

11: Crossbar

111: Block

112: pole

12b: Clamping arm

121: first arm

122: second arm

123: Pivot

124: Cross Department

13: Elastic element

20: Stopper

50b: conveyor chain

70b: PCB

H ₁ : width of clamp

H ₂ : Respite width

Claims (19)

A limit device for a PCB frame clamp bracket, comprising: two clamp arms, which are symmetrically arranged on both sides of a cross bar used as a fixed end in a relatively rotatable manner; the two clamp arms respectively form a span symmetrically A PCB accommodating slot is formed between the two straddles and the cross bar. The PCB accommodating slot has a PCB accommodating inlet at the end relatively far away from the cross bar. It has a clamped width H ₁ ; and two stoppers are symmetrically arranged on the crossbar, and the two clamp arms are respectively positioned at the PCB placement entrance to a temporary width H by the restraints of the two stoppers _2. The rest width H _{2 is} greater than the clamping width H _{1 of} the PCB. The limit device for the PCB frame clamp bracket according to claim 1, wherein the limiter has a guide surface and a stop surface, and the guide surface receives the push of an arm of the clamp arm , The stop surface is used to stop the arm and restrain the clamp arm. The limit device of the PCB frame clamp bracket according to claim 2, wherein an included angle of less than 90 degrees is formed between the guide surface and the stop surface, and the guide surface is inclined relative to the cross bar The stop surface is a vertical surface relatively perpendicular to the crossbar. The limit device of the PCB frame clamp bracket according to claim 2 or 3, wherein the limiter is a reed, one end of the reed is fixed on the cross bar, and the other end of the reed When suspended, the guide surface continues the stop surface and is integrally formed on the leaf spring. The limit device for the PCB frame clamp bracket according to claim 4, wherein the suspended end of the reed is located at the end of the stop surface. According to claim 2 or 3, the limit device of the PCB frame clamp bracket, wherein the limiter is a pressing member, the pressing member is pivotally arranged on the cross bar, and the pressing member A spiral compression spring is arranged between the fastener and the cross bar. As claimed in claim 2 or 3, the limit device of the PCB frame clamp bracket, wherein the limiter is a push member, the push member is pivotally arranged on the cross bar, and the push member A spiral tension spring is arranged between the shift member and the cross bar. The limit device of the PCB frame clamp bracket according to claim 2, wherein two elastic elements are symmetrically arranged on the two clamp arms, and the two elastic elements respectively drive the two clamp arms to swing in opposite directions. Clamp the PCB into the entrance. The limit device of the PCB frame clamp bracket according to claim 2, wherein the cross bar is arranged on a moving path to carry the PCB to move. The limit device of the PCB frame clamp bracket according to claim 9, wherein at least one pusher is respectively configured on both sides of the moving path, and the arm of the clamp arm is driven by the pusher to push Touch the guide surface of the stopper, and make the arm of the clamp arm accept the stop of the stop surface to restrain the clamp arm, the pusher drives the clamp arm away from the stopper Restrained and reset. The limit device of the PCB frame clamp bracket according to claim 10, wherein the pusher includes a limit pusher, and the arm of the clamp arm is driven by the limit pusher to push against the The guide surface of the stopper and the arm portion of the clamp arm accept the stop of the stop surface to restrain the clamp arm. The limit device of the PCB frame clamp bracket according to claim 11, wherein the pusher group further includes a limit release pusher, and the limit release pusher is used to drive the clamp arm out of the restraint of the limiter. Reset. The limit device for the PCB frame clamp bracket according to claim 12, wherein the moving path includes a picking end and an unloading end of the PCB, and the moving path extends through the inside of an oven, and the picking end and The unloading ends are respectively exposed outside the oven, the moving path is formed around by a circularly movable conveyor chain, and the carriage is driven by the conveyor chain to pass through the picking end and the unloading end along the moving path. The limit device of the PCB frame clamp bracket according to claim 13, wherein the limit pusher is disposed at the capturing end. According to claim 14, the limit device of the PCB frame clamp bracket, wherein the capture end is further equipped with a PCB detection element, and the limit pusher is controlled by the PCB detection element. The limit device of the PCB frame clamp bracket according to claim 13, wherein the pushing The device also includes a material-feeding and clamping-opening pusher arranged at the capturing end. The limit device of the PCB frame clamp bracket according to claim 13, wherein the pusher further includes a discharge clamp open pusher arranged at the unloading end. The limit device of the PCB frame clamp bracket according to claim 13, wherein the moving path is composed of a first revolving track, a first linear track, a second revolving track, and a second linear track. The capture end is located in the first revolving track, the unloading end is located in the second revolving track, the carriage moves from the capture end to the unloading end along the first linear track, and along the second linear track Move from the unloading end to the capturing end. The limit device of the PCB frame clamp bracket according to claim 17, wherein the limit release pusher is disposed on the second linear track or the unloading end.

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