JPH01278922A - Manufacture of lever device - Google Patents

Abstract

PURPOSE:To improve the accuracy of a lever device and to reduce the manufacturing cost by reducing a die diameter and a punch diameter sequentially, forming a bush hole by a plurality of deep drawings, then, integrally forming an arm part and a bush part by press operation in one body. CONSTITUTION:A metallic stock sheet 10 is pressed by a die 11a and a punch 12a to form a recess part 14. Then, the metallic stock sheet is pressed by dies and punches having sequentially smaller die diameters and punch diameters at a plurality of times to form a deep hole 17 finally. Further, the end part of a deep hole 17 is pressed by the die 11e having a hole 13e of desired diameter and a push member 18 in the lower part to form a bush part 8. At this time, an arm part 9, too, is press-formed integrally. Since the bush part 8 is formed by a plurality of drawings the accuracy of the bush part 8 is improved. Since the number of parts is decreased and the bush part 8 and the arm part 9 are formed by pressing only, the manufacturing cost of the lever device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a lever device, and more particularly to a lever device having a highly precise bushing portion.

For example, a VTR is equipped with a loading mechanism that pulls out a tape from a tape cassette and forms a tape bus for winding it around a rotating head.

Arms and levers used in the loading mechanism of a VTR like this allow for smooth loading operations.
In addition, relatively high viscosity parts are used to ensure this.

BACKGROUND OF THE INVENTION FIG. 4 shows a sectional view of an example of a conventional lever device having a high-precision bushing portion.

Manufacturing method of the lever device shown in FIG. 4 After caulking a cut-formed bushing portion 3 as shown in FIG. 5(B) to the arm portion 1 of the press-formed product as shown in FIG. 5(A), The hole 4 of the cut-formed bushing 3 was reamed to maintain the accuracy of the hole 4.

Problems to be Solved by the Invention However, for example, levers used in the mechanical parts of conventional VTRs require cutting a bushing part 3 to be caulked into a hole part 2 of a press-formed arm part 1 in order to improve the hole accuracy. After that, it is necessary to ream the hole 4 of the bushing part 3, which increases the number of parts to be processed and the number of parts, resulting in problems such as high cost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a lever device in which an arm portion and a bushing portion are integrally formed by press working.

Means for Solving the Problems The present invention provides a method for manufacturing a lever device comprising a bushing portion having a predetermined inner and outer diameter and an arm portion fixed to the bushing portion. The diameter is made smaller after each deep drawing process.
a step of pressing to form a recess in the blank; a step of punching out the recess to form a hole; placing the hole in a mold having the predetermined inner and outer diameters, and pressing the end surface of the hole with a pressing member. The arm part and the bushing part are integrally formed by press working.

After forming four parts by pressing the operating element plate while reducing the diameter of the die and the diameter of the punch corresponding to the die for each of multiple deep drawing processes, the hole part is punched and the hole part is formed. and placing the blank in a mold having predetermined inner and outer diameters,
A bushing portion having a predetermined inner and outer diameter is formed by pressing the end face around the hole portion of the blank plate with a pressing member, and an arm portion is formed by punching out the blank plate with the bushing portion formed thereon, and an arm portion and a bushing portion are formed. to form an integral part.

In the conventional method of manufacturing a lever device, the arm part is press-processed, the bushing part is cut, and the bushing part is caulked to the arm part.However, as described above, in the present invention, the bushing part is formed in the same way as the arm part. Since press processing is now possible, the arm portion and bushing portion can be integrally formed.

Embodiment FIG. 2 shows a plan view and a side view of a lever device according to an embodiment of the present invention.

The 1iJ manufacturing method of the lever device of this embodiment is used in a mechanism for arranging the pinch roller of a VTR inside the tape path, and shows a pinch roller arm that locks the pinch roller.

The pinch roller arm 5 locks a pinch roller 7, which is a first member, in a hole 6a provided in a part of the arm, and a shaft fixed at a predetermined position passes through the bushing part 8. Further, a second member, a pinch roller drive member (not shown), is engaged with the locking portion 6b. When loading the tape, the pinch roller arm 5 is positioned above the shaft to release the pinch roller 7 so as not to interfere with the loading process, and after loading, it rotates in a predetermined direction and presses the capstan with the pinch row 57. It is something. Therefore, the bushing part 8 needs to be molded with high precision in order to move up and down and rotate smoothly.

In this embodiment, the bush portion 8 and arm portion 9, which require high precision as described above, are integrally formed by press working.

Next, the manufacturing method will be explained with reference to FIG. First, as shown in FIG.
0 is a die 11 having a hole 13a with a predetermined diameter.
A and the bonder 12a having a diameter slightly smaller than the diameter of the hole 138 of the die 11a are pressed to form a shallow recess 14.

Next, as shown in FIG. 1(B), the hole 8IS1 of the blank plate 10 is
4, and a die 11b and a die 1 having a hole 13b having a diameter slightly smaller than the diameter of the hole 13a of the die 11a.
Punch 12b with a diameter slightly smaller than the diameter of hole 13b of 1b
By pressing, a recess 15 smaller in diameter and deeper than the recess 14 formed in the blank plate 10 is formed.

Subsequently, as shown in FIG. 1(C), the hole 15 formed in the blank plate 10 is further inserted into a die 11G having a hole 11G having a diameter slightly smaller than the diameter of the hole 13b of the die 11b. A recess 16 smaller in diameter and deeper than the recess 15 of the blank plate 10 is formed by pressing with a punch 12G having a diameter slightly smaller than the diameter of the hole 13C of the blank 11c.

Next, as shown in FIG. 1(D), the four parts 16 formed on the blank plate 10 are made into a die 11d having a hole 13d smaller in diameter than the hole 13c of the die 11G. The blank plate 10 is pressed with a punch 12d having a small diameter.
The recess 16 is formed to have a smaller diameter and deeper, and the punch 12 ([0) is passed through the blank plate 10 to form a deep hole 17.

As a finishing step, as shown in FIG. 1(E), a die 11e having a hole 13e with the same diameter as the outer part of the bushing part 8 which requires the deep hole 17 of the raw plate 10 and a bushing part which requires The deep hole 17 of the blank 10 is fixed with a bonder 12e having the same diameter as the inner diameter of the die 11e, and the hole 13 of the die 11e is fixed.
From below e, the end of the deep hole 17 is pressed by a pressing member 18 whose outer diameter is between the inner diameter of the hole 13d of the die 11e and between the inner diameter and the diameter of the punch 12e, as shown in FIG. A bushing portion 8 having a height of 10#I as shown in FIG.

Note that at this time, the arm portion 9 is also integrally pressed and processed.

According to the 'IJ33 method as described above, by performing deep drawing while gradually reducing the diameters of the pump and die, a deep hole can be formed without causing destruction of the blank plate 10 due to drawing. Further, in the step shown in FIG. 1(E), tolerances of the inner and outer diameters of the bushing portion are determined. For example, in the case of the processed product shown in Figure 1, the inner diameter + O, 0) f3
-0-ol, 3 is φ4, outer diameter is φ7-0
．． 03! Is it necessary to make it i? However, this dimensional accuracy can be sufficiently ensured by the above-described processing method.

The lever assembly d manufactured by the method described above is not limited to pinch roller arms, but can be widely applied to arms having bushings, levers, etc. Further, the steps are not limited to the above ten steps, but may be changed by changing the diameter of the deep drawing die and punch.

Effects of the Invention As described above, according to the present invention, the lever device manufacturing method integrally forms the arm portion and the bushing portion having the hole by press working, which reduces the number of parts and eliminates the need for caulking, etc. Since no work is required, costs can be reduced, and it has features such as improved immovability.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining an embodiment of the present invention, FIG. 2 is a plan and side view of a lever device manufactured by the lllll method of the present invention, and FIG. 3 is a diagram for explaining a lever device manufactured by the manufacturing method of the present invention. FIG. 4 is a sectional view of a conventional lever device, and FIG. 5 is a perspective view of each part of the conventional lever device. 5... Pinch roller arm, 8... Bushing part, 9
···arm. Patent applicant Representative of Victor Japan Co., Ltd. Patent attorney Tadahiko Ito
：・、゛、３゛＼２／ Same patent attorney Kaneyuki Matsuura・′〜“(−−4
:2, 11 Figure lI2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In a method for manufacturing a lever device comprising a bushing portion having a predetermined inner and outer diameter and an arm portion fixed to the bushing portion, the diameter of a die and the diameter of a punch corresponding to the die are determined. A step of forming a recess in the blank by pressing it into a smaller size after each process of multiple deep drawing processes, a step of punching out the recess to form a hole, and a step of forming the blank into the predetermined inner and outer diameters. forming a bushing portion with a predetermined inner and outer diameter by pressing an end surface around the hole of the blank plate with a pressing member, the arm portion and the bushing portion A method for manufacturing a lever device, characterized in that the lever device is integrally formed by press working.