JPH0674286U - Seating displacement prevention structure for vacuum cup - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a structure of a vacuum cup that does not cause seating displacement of the vacuum cup on a work. [Construction] The vacuum cup 20 has a cored bar 21 in which an air suction hole 25 is formed, and an elastic seating pad 22 attached to the cored bar 21 and seated on the surface of the cathode ray tube B. The seating pad 22 is formed in a straight tubular shape and has a flat seating surface 27 at its tip. The seating surface 27 is pressed against the surface of the cathode ray tube B when the vacuum cup 20 is seated on the cathode ray tube B. At the same time, the seating pad 22 receives a force in the crushing direction. Since the seating pad 22 is formed straight, the seating surface 27 receives a force in a substantially vertical direction from the seating pad 22, and adheres to the cathode ray tube B without sliding sideways.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for preventing a seat displacement of a vacuum cup on a work.

[0002]

[Prior art]

 Conventionally, a vacuum cup has been used when carrying a work such as a glass plate, a metal plate, a cathode ray tube, etc., which has a relatively thin material, a flat surface, and is difficult to grip. As shown in FIG. 5, the vacuum cup is a seating pad on which a core 12 having an air suction hole 11 and a ring-shaped elastic body are baked on the core 12 and seated on the surface of the work W. It is composed of 13 etc.

A lip portion 14 is formed on the seating pad 13. The lip portion 14 is provided so that the vacuum cup 10 can surely adsorb the work W. Therefore, the lip portion 14 is formed in a divergent shape at the end, and as the air in the vacuum cup 10 is sucked, the portion in close contact with the work W is widened. Further, the wall thickness of the lip portion 14 becomes thinner as it approaches the tip.

[0004]

[Problems to be solved by the device]

 However, in such a vacuum cup 10, the surface of the work W may be rubbed by the lip portion 14. Therefore, there are problems that the surface of the work W is scratched and the lip portion 14 is worn.

[0005]

[Means for Solving the Problems]

 The present invention is directed to a vacuum cup having a cored bar having an air suction hole and an elastic seating pad attached to the cored bar and seated on the surface of a work, the seating pad being a straight tube. The above-mentioned problems have been solved by a structure having a flat seating surface at the tip.

[0006]

[Action]

 The seating surface is pressed against the surface of the work when the vacuum cup is seated on the work. At the same time, the seating pad receives a force in the crushing direction. Since the seating pad has a straight seating surface, the seating surface receives a force in a substantially vertical direction from the seating pad and can be brought into close contact with the work without sliding sideways.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The vacuum cup 20 is incorporated in, for example, a transfer device (not shown) of a cathode ray tube manufacturing line, and sucks the cathode ray tube (work) B. The vacuum cup 20 includes a cored bar 21, a seating pad 22 and the like. The cored bar 21 is attached to the cylinder 34 of the transfer device, and an air suction hole 25 is formed in the center. A ring-shaped and rubber protection pad 26 is attached to the core 21. The protective pad 26 is provided to prevent the metal core 21 from contacting the cathode ray tube B and damaging it when the vacuum cup 20 adsorbs the cathode ray tube B.

The seating pad 22 is a rubber pad that is formed in a ring shape and is press-fitted into the cored bar 21. The thickness of the seating pad 22 in the diameter direction is uniform. As a material for the seating pad 22, sponge may be used instead of rubber. In the case of sponge, there are two types: a type of sponge with continuous air bubbles and a type of sponge with independent air bubbles, but both types can be used. A flat seating surface 27 is formed at the tip of the seating pad 22. The seating surface 27 is a portion that contacts the cathode ray tube B.

Next, the operation will be described. The vacuum cup 20 is seated on the surface of the cathode ray tube B. At this time, the vacuum cup 20 is pressed against the surface of the brown tube B by the cylinder 34 of the transfer device. After that, the air inside the vacuum cup 20 is sucked through the air suction hole 25, and the inside of the vacuum cup 20 approaches a vacuum. As a result, the vacuum cup 20 attracts the cathode ray tube B and lifts the cathode ray tube B by the operation of the cylinder 34. The vacuum cup 20 which has carried the cathode ray tube B to a predetermined place is supplied with air inside to release adsorption, and is moved to a new cathode ray tube B.

The seating surface 27 is pressed against the surface of the Braun tube B when the vacuum cup 20 is seated on the Braun tube B. At the same time, since the seating pad 22 is formed straight, it receives a force in the crushing direction. The seating surface 27 receives a force in a substantially vertical direction from the seating pad 22, and is brought into close contact with the cathode ray tube B without sliding sideways.

Therefore, the seating pad 22 is less likely to scratch or wear the surface of the cathode ray tube B. Further, since the seating pad 22 receives a force in the direction of being crushed, the amount of expansion and contraction is smaller than that of the conventional seating pad 22, and the durability is improved.

Although the seating pad 22 shown in FIG. 1 is formed in a ring shape having a uniform thickness, it is press-fitted into the core bar 121 of the seating pad 122 as shown in FIG. A bellows-shaped cushion 128 may be formed between the portion and the seating surface 27 to cushion the impact when the vacuum cup 20 contacts the cathode ray tube B. In this case, the seating pad 122 is also formed in a straight ring shape as a whole.

Further, the seating pads 22 and 122 are press-fitted into the cored bars 21 and 121 with a dimensional tolerance so that the seating pads 22 and 122 come off when an operator forcibly pulls them. Therefore, the seating pads 22 and 122 are attached so as not to be disengaged from the cored bars 21 and 121 in a normal use state and replaceable.

Further, as a structure for attaching the seating pad in a replaceable manner, there is the following structure. (1) The seating pad 22 is attached to the cored bar 21 with a known double-sided tape (not shown) interposed at the portion indicated by the arrow A in FIG. (2) As shown in FIG. 3, the seating pad 222 is attached to the core metal 221 with the screw 231. (3) As shown in FIG. 4, the seating pad 322 is attached to the core metal 321 by the engagement of the protrusion 333 and the groove 332.

[0015]

[Effect of device]

 The seat shift prevention structure of the present invention has the following effects. (1) Since the seating pad is formed straight on the seating surface, the seating pad receives a force in a direction substantially perpendicular to the seating surface and can be seated on the work without sliding sideways. Therefore, the seating pad is less likely to scratch or wear the surface of the work. (2) Since the seating pad receives a force in the crushing direction, the amount of expansion and contraction is smaller than that of the conventional seating pad, and the durability is improved accordingly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along an air suction hole of a vacuum cup having a seating displacement prevention structure of the present invention.

FIG. 2 is a sectional view showing a part of a vacuum cup to which a seating pad of another embodiment is attached.

FIG. 3 is a cross-sectional view showing a part of another attachment structure of the seating pad with respect to the cored bar.

FIG. 4 is a cross-sectional view showing a part of another attachment structure of the seating pad with respect to the cored bar.

FIG. 5 is a sectional view taken along an air suction hole of a conventional vacuum cup.

[Explanation of symbols]

 B cathode ray tube (work) 20 vacuum cup 21,121,221,321 core metal 22,122,222,322 seating pad 25 air suction hole 27,127 seating surface

Claims (1)

[Scope of utility model registration request] 1. A vacuum cup comprising a cored bar having air suction holes and an elastic seating pad attached to the cored bar and seated on the surface of a workpiece.
The seating pad is formed in a straight tubular shape and has a flat seating surface at a tip thereof.