JP2000308931A - Chucking mechanism for thin plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve trouble with the deformation such as warp, deflection, etc., of a thin plate impeding a sure chuck, damaging the thin plate, lower the rate of operation of a machine and increasing man-hour by repair in a chucking mechanism constituted so as to chuck the thin plate by making an almost U-shaped pawl approach an end edge of the thin plate as a chucking object. SOLUTION: In a chucking mechanism holding thin plate both end edge in a recessed part 11a of each almost U-shaped pawl by making two pawls 11 of section in almost U shape approach relating to both the end edges of an easily deformed thin plate 20 and detaching it by moving the two pawls in a separating direction, a width of a hold plate 12 in the interior side constituting almost the U-shaped pawl is constituted larger than a width of a hold plate 13 in this side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mechanism for mechanically chucking easily deformable thin plates such as a printed board, a ceramic plate, a quartz plate, etc. The present invention relates to a thin plate chucking mechanism that can effectively prevent the nail of the thin plate from breaking the thin plate.

[0002]

2. Description of the Related Art Printed circuit boards used for the electrical components of various electronic devices and quartz plates and ceramic plates used for electronic components are formed into thin plates of 1.0 mm or less as required. In the case where these thin plates are moved to a predetermined assembly site or the operation of transferring the thin plates is automatically performed, a mechanical chucking mechanism is used. FIG. 4 is a perspective view showing an example of a conventional chucking mechanism.
The two chucks 2 having the above are brought close to the both edges of the thin plate 3, and the both edges of the thin plate are fitted into the concave portions 1a of the claws 1 to hold and transport the thin plate. Figures 5 (a), (b) and
(c) is a schematic view showing a procedure for chucking the thin plate with the U-shaped claw. First, as shown in (a) and (b), the thin plate 3 is moved to a predetermined position between the two claws 1 at the retracted position. Then, as shown in (c), the both claws 1 are moved toward the both ends of the thin plate 3 so that the two ends of the thin plate 3 are fitted and held in the concave portions 1a of the respective claws 1. However, when the thin plate 3 is deformed such as warpage as shown in FIGS. 6 (a) and 6 (b), when the chucking is performed using the above-described chucking mechanism,
As shown in FIG. 6B, a chucking failure occurs, and in some cases, the thin plate 3 may be damaged. Occurrence of such a situation may be caused by a decrease in the operating rate of the chucking device,
Problems such as an increase in the number of man-hours due to the rework are brought about.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a chucking mechanism configured to chuck a substantially U-shaped claw by approaching an edge of a thin plate as an object to be chucked. In order to solve the problem that the reliable chuck is hindered due to deformation such as warpage or bending of the thin plate, the thin plate is damaged, the operation rate of the machine is reduced, and the number of man-hours for rework is increased. is there.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that each claw is approximated by bringing two claws having a substantially U-shaped cross section close to both ends of a thin plate which is easily deformed. In the chucking mechanism for holding the both edges of the thin plate in the concave portion of the U-shaped claw and detaching the thin plate by moving the two claws in the separating direction, the chucking mechanism on the back side constituting the substantially U-shaped claw is provided. The width is configured to be larger than the width of the holding plate on the front side. In the invention of claim 2, when positioning the thin plate between the two claws, the positions of the claws are set so that the interval between the holding plates on the back side of each nail is smaller than the width of the thin plate. It is characterized by the following. The invention according to claim 3 is characterized in that the inner wall of the near-side holding plate is formed in a tapered shape. The invention according to claim 4 is characterized in that the edges of the holding plate on the back side constituting the two claws are formed in an uneven shape so as to fit in a telescopic manner.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1A is an explanatory diagram of a configuration of a chucking mechanism according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view illustrating a configuration of a claw. This chucking mechanism has two chucks 10 configured to be able to advance and retreat in the direction of the arrow, and claws 11 integrated with each chuck 10. Each of the claws 11 has a substantially U-shaped planar shape having a concave portion 11a so as to easily chuck both end edges of the thin plate 20. That is, each claw 11 includes a holding plate 12 on the back side, a holding plate 13 on the near side, and a recess 11a located between the holding plates 12, 13, and the width of the holding plate 12 on the back side is The width is set longer than the width of the holding plate 13 on the near side. Further, as shown in FIG. 1B, the inner wall 12a of the holding plate 12 on the far side is made flat while the inner wall 13a of the holding plate 13 on the near side is tapered. The reason why the width of the holding plate 13 on the near side is reduced and the tapered portion is formed on the inner wall 13a is to make it easier to insert the thin plate into the recess 11a.

As shown in FIG. 2 (a), a method of chucking a thin plate with both claws 11 is such that the distance W between both ends of the holding plate 12 at the back of the two claws 11 is smaller than the width L of the thin plate 20. In this state, the interval between the two claws 11 is set, and in this state, the thin plate 20 is pushed between the two claws 11 by the holding plate 15. At this time, as shown in FIG. 2 (b), the thin plate abuts against two holding plates 12 on the back side facing each other at a distance W, which is a distance smaller than the width L of the thin plate 20, and the pressing force of the pressing plate 15 is applied. Keeps the contact state. Therefore, even if the thin plate 20 is deformed such as warpage, both the holding plates 12 and the holding plate 1
5, the deformation is temporarily corrected to some extent. In this state, as shown in FIG.
Is moved toward both end edges of the thin plate, and when the holding plate 13 on the near side approaches the edge of the thin plate, the presser plate 15 is retracted. Subsequently, the chucking is completed by further moving the claws 11 in the approaching direction after the retraction of the presser plate 15 as shown in FIG. In the state shown in FIG. 2B, even if the edges of the thin plate are slightly warped or deformed, the inner wall of the holding plate 12 on the front side is tapered, so that each edge is easily recessed 11a. Can lead inside.

In the above embodiment, since the distance W between the two holding plates 12 in the state shown in FIG. 2B is wide, even if pressure is applied by the holding plate 15, deformation such as warpage cannot be sufficiently corrected. Ideally, as shown in FIG.
It is preferable to set the length so that the two end portions contact each other. However, in this configuration, the holding plate 12 is in the way and the claws cannot move further inward, so that it is impossible to chuck the thin plate. Therefore, in the second embodiment of the present invention, as shown in FIG. As a result, the above-described ideal structure was realized. In other words, even in the separated state shown in FIG. 3 (a), the pressed thin plate can be held by the projections 16a constituting the unevenness 16, so that the warp is generated by clamping the thin plate with the pressing plate 15. After sufficient correction, the both edges of the thin plate can be securely fitted and gripped by the recesses of the claws. Further, when the claws are moved in the approaching direction thereafter, there is a margin for the distance until one of the protrusions is completely fitted into the one of the recesses, so that the thin plate is sufficiently held. Can be.

[0008]

As described above, according to the present invention, there is provided a chucking mechanism in which a substantially U-shaped claw is brought close to an edge of a thin plate as an object to be chucked and chucked. Deformation such as deformation can hinder a reliable chuck, break a thin plate, reduce the operating rate of a machine, or increase the number of man-hours for rework. In other words, the invention of claim 1 holds the two ends of the thin plate in the recesses of the substantially U-shaped claws by bringing two claws having a substantially U-shaped cross section close to the both ends of the thin plate which is easily deformed. In the chucking mechanism for detaching the thin plate by moving the two claws in the separating direction, the width of the back side holding plate constituting the substantially U-shaped claw is configured to be larger than the width of the front side holding plate. . For this reason, when the thin plate is pushed between the two claws from the near side, and the two claws are brought close to each other to perform the work of holding the both ends of the thin plate, the holding plate on the near side does not become an obstacle, so that there is no warpage. The deformed thin plate can be reliably chucked. In the invention of claim 2, when positioning the thin plate between the two claws, the positions of the claws are set such that the distance between the holding plates on the back side of each nail is smaller than the width of the thin plate. Therefore, when pressing the thin plate between the claws using a holding plate or the like and positioning it, securely support the thin plate between the holding plates on the back side and temporarily compress deformation between the holding plate and warp etc. And the thin plate can be securely fitted and held in the recesses of both claws.
According to the third aspect of the present invention, since the inner wall of the holding plate on the front side is tapered, the edge of the warped thin plate is reliably guided by the tapered portion, and the edge of the thin plate is inserted into the recess of each claw. Can be guided without difficulty. According to the fourth aspect of the present invention, since the edge of the back side holding plate constituting the two claws is formed into an uneven shape to be fitted in a telescopic manner, when the thin plate is pushed between the two claws, the back side is pushed. While the thin plate can be reliably supported by the holding plate, a sufficient margin for subsequently moving both claws in the approaching direction can be secured.

[Brief description of the drawings]

FIG. 1A is a configuration explanatory view of a chucking mechanism according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view illustrating a configuration of a claw.

FIGS. 2A to 2D are diagrams illustrating a method of chucking a thin plate with a claw according to the present invention.

FIG. 3A is an explanatory view of a modification of the present invention, and FIG. 3B is a view showing a conventional defect.

FIG. 4 is an explanatory diagram of a conventional example.

5 (a), (b) and (c) are explanatory views of a chucking procedure by a conventional chucking mechanism.

FIGS. 6A and 6B are diagrams for explaining the disadvantages of the conventional example.

[Explanation of symbols]

Reference Signs List 10 chuck, 11 claw, 11a recess, 12 back holding plate, 12a inner wall, 13 front holding plate, 13
a Inner wall, 15 holding plate, 20 thin plate.

Claims (4)

[Claims] 1. A method for holding two ends of a thin plate in a recess of each substantially U-shaped claw by bringing two claws having a substantially U-shaped cross section close to both end edges of the thin plate which is easily deformed. In the chucking mechanism for detaching the thin plate by moving the thin plate in the separating direction, the width of the back side holding plate constituting the substantially U-shaped claw is configured to be larger than the width of the front side holding plate. A chucking mechanism for thin plates. 2. When positioning the thin plate between the two claws, the positions of the claws are set such that the distance between the holding plates on the back side of each nail is smaller than the width of the thin plate. The chucking mechanism for a thin plate according to claim 1, wherein: 3. The thin plate chucking mechanism according to claim 1, wherein an inner wall of the holding plate on the front side is tapered. 4. The thin plate according to claim 1, 2 or 3, wherein the edges of the holding plate on the rear side constituting the two claws are formed in an uneven shape so as to fit in a telescopic manner. Chucking mechanism.