JPH08197341A - Shaft insertion device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a shaft inserting device capable of securely and easily inserting a shaft such as a drum shaft into a hole of an object such as an upper drum by shrink fitting. [Structure] A shaft insertion device for inserting a shaft 2 into a hole 1c of an object 1 by shrink fitting, and has a shaft holding means 70 for holding the shaft 2 and an object holding means 80 for holding the object 1. . The object holding means 80 moves the heating means 10 for heating the object 1 to expand the hole 1c of the object by heat, and the axis holding means 70 and the object holding means 80 relatively move to target the axis 2. Inserting means 100 for inserting into the hole 1c of the article 1
And a centering means 90 for adjusting the coaxiality of the shaft 2 held by the shaft holding means and the object 1 held by the object holding means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft inserting device for inserting a shaft into a hole of an object by shrink fit.

[0002]

2. Description of the Related Art Generally, a rotary magnetic recording device or a rotary magnetic recording / reproducing device used in a VTR or the like has, for example, an upper drum, a lower drum, and a magnetic head mounted on the upper drum. The upper drum is fixed to the drum shaft, and the upper drum is rotatable with respect to the lower drum. By rotating the magnetic head together with the upper drum, it is possible to record information on a magnetic tape such as a VTR tape or reproduce information recorded on the magnetic tape.

When manufacturing such a rotary magnetic recording device or a rotary magnetic recording / reproducing device, there is a step of inserting a drum shaft into a hole of an upper drum (also referred to as a rotary drum). As a method of inserting the drum shaft into the hole of the upper drum, two methods of press fitting and shrink fitting are generally adopted. In the method of inserting the drum shaft by shrink fitting, the upper drum is heated, the hole of the upper drum is expanded to be larger than the shaft diameter of the drum shaft, and the drum shaft is inserted into the hole. . In such a shrink fitting method, the work of inserting the drum shaft into the hole has been performed by the operator's hand or by a hand press.

[0004]

However, when the drum shaft is inserted in this way, the insertion speed of the drum shaft into the hole is not constant, and the coaxiality between the drum shaft and the upper drum cannot be obtained well. To match the coaxiality well,
It depends largely on the skill of the worker. Therefore, depending on the operator, there is a possibility that the drum shaft may be inserted incorrectly or that the accuracy of the insertion may be poor. In addition, in order to make the coaxiality of the hole of the drum shaft and the upper drum highly accurate, it is necessary to make the parts precision of the drum shaft and the upper drum strict, and the precision of the device for processing them, too, resulting in high cost. become.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and a shaft such as a drum shaft can be securely and easily inserted into a hole of an object such as an upper drum by shrink fitting. It is an object of the present invention to provide a shaft insertion device capable of

[0006]

According to the invention of claim 1, there is provided a shaft inserting device for inserting a shaft into a hole of an object by shrink fitting, and a shaft holding device for holding the shaft. Means, object holding means for holding the object, and heating means for heating the object in order to expand the hole of the object by heat, the shaft holding means and the object holding means An insertion means for relatively moving the shaft to insert the shaft into the hole of the object, the shaft held by the shaft holding means, and the coaxial of the object held by the object holding means. And a centering means for adjusting the degree.

In the invention of claim 2, preferably, the object is a drum of a rotary magnetic drum device or an accessory thereof.

In the invention of claim 3, preferably, the insertion means relatively moves the shaft and the object to a first position where the end of the shaft and the hole of the object come into contact with each other. First moving means for moving the shaft and the object relative to each other from the first position to a second position where the end of the shaft is inserted into the hole of the object. Second
And a moving means.

In the invention of claim 4, preferably, the first
The moving means and the second moving means are fluid pressure driven cylinders.

[0010]

According to the invention of claim 1, the shaft holding means holds the shaft, and the object holding means holds the object. In such a state, the heating means of the object holding means heats the object and expands the hole of the object by heat. This facilitates insertion of the shaft into the hole in the object. The inserting means relatively moves the shaft holding means and the object holding means,
The shaft is adapted to be inserted into the hole of the object. At that time, the aligning means adjusts the coaxiality of the shaft held by the shaft holding means and the object held by the object holding means.
In this way, when inserting the shaft into the hole of the target object, the hole is expanded by the heat of the heating means and the coaxiality of the target object and the shaft is adjusted, so that the shaft is surely placed in the hole of the target object. Can be inserted by shrink fit.

According to the second aspect of the present invention, preferably, the object is a drum of a rotary magnetic drum device (also referred to as a rotary magnetic recording / reproducing device or a rotary magnetic recording device) or an accessory thereof (for example, a flange), and the drum Alternatively, the shaft can be surely and easily inserted into the hole of the appendage.

According to the third aspect of the invention, preferably, the inserting means has the first moving means and the second moving means,
By varying the speeds of the first moving means and the second moving means, it is possible to insert the shaft into the hole of the object by shrink fitting with higher efficiency.

According to the invention of claim 4, when the first moving means and the second moving means are preferably fluid pressure driven cylinders, the shaft is inserted into the hole of the object by shrink fitting with a simple structure. be able to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

FIG. 1 shows a preferred embodiment of the shaft inserting device of the present invention, which is a device for inserting the shaft into the hole of the upper drum by shrink fitting. The shaft inserting device includes a shaft holding means 70, an object holding means 80, an aligning means 90, an inserting means 100, and a device body 5. The shaft holding means 70 includes a slide portion 4 and a V block 1.
1, a spring 13, and sliders 16 and 17. The slide portion 4 includes a first portion 4a and a second portion 4b, and a slider 17 and a spring 13 are provided between the first portion 4a and the second portion 4b. The sliders 17 can move the slide portions 4a and 4b in the arrow Y direction. The slider 16 is arranged between the slide body 37 and the second portion 4b, and the slide body 37 and the second portion 4b are provided.
Are movable relative to each other in the direction of arrow Y. First part 4a
A V block 11 is attached to the V block 11, and the V block 11 detachably holds the upper end portion 2a of the shaft 2 as shown by the chain double-dashed line in FIG. That is, the V block 11 is attached to the shaft 2 by an air chuck (not shown)
Holds the upper end 2a of the. One end of the spring 13 is attached to the first portion 4a of the slide portion 4, and the other end of the spring 13 is fixed to the slide portion 4b. As a result, the spring 13 controls the force of the movement when the first portion 4a and the second portion 4b move relative to each other via the slider 17.

The object holding means 80 is a part for holding the upper drum 1 which is an object in a detachable manner, and has a base portion 3. The base portion 3 includes a pedestal 6, a guide 7, a roller 8, a retainer 9, a heater 10 as a heating means for the upper drum 1, and the like. The upper surface 6a of the pedestal 6 is formed in a concavo-convex shape, and the upper surface 6a has a shape substantially corresponding to the inner surface shape of the upper drum 1. As shown in FIG. 1, the gap between the receiving surface 1a of the upper drum 1 arranged on the upper surface 6a and the shaft abutting surface 6b of the upper surface 6a is set to the dimension a. The amount of protrusion of the lower end portion 2b of the shaft 2 from the upper drum 1 can be set by this clearance dimension a. A support plate 48 is arranged below the pedestal 6 via a retainer 9. The support plate 48 and the cradle 6
A retainer 9 and a roller 8 are arranged between them. The guide 7 is a portion for accommodating the lower outer peripheral surface of the pedestal 6, the retainer 9, and the roller 8. The inner diameter of the guide 7 is larger than the outer diameter of the pedestal 6. That is, the outer diameter of the outer peripheral portion of the lower portion of the pedestal 6 is smaller than the inner diameter of the guide 7. The roller 8 may be a steel ball or a ceramic ball, and the receiving table 6 is movable in the guide 7 in the arrow X direction (horizontal direction) via the roller 8. This guide 7, pedestal 6, roller 8 and retainer 9
Constitutes an aligning means 90 for adjusting the coaxiality between the shaft 2 and the upper drum 1. That is, when the shaft 2 is inserted into the hole 1c of the upper drum 1, the pedestal 6 is moved and adjusted in the direction of the arrow X, and the axis of the shaft 2 held by the V block 11 and the pedestal of the base portion 3 are adjusted. 6 and the shaft center of the upper drum 1 held by
It is designed to be adjusted automatically. The arrow X direction is a direction orthogonal to the above-mentioned arrow Y direction.

Next, the inserting means 100 will be described.
The insertion means 100 has a first air cylinder 12 and a second air cylinder 14. First air cylinder 12
Is attached to the column 5a, and the second air cylinder 14 is attached to the slide body 37. First
The rod 12a of the air cylinder 12 of the
It is connected to. Rod 1 of second air cylinder 14
4a is connected to the second portion 4b of the slide portion 4. The slider 15 is arranged between the slide body 37 and the column 5 a of the main body 5. By operating the air cylinder 12, the slide body 37 can be relatively moved in the arrow Y direction with respect to the column 5 a via the slider 15. On the other hand, by operating the second air cylinder 14, the second portion 4b can be moved with respect to the slide body 37 in the arrow Y direction via the slider 16.
The first air cylinder 12 relatively moves the shaft 2 and the upper drum 1 in the arrow Y direction up to a first position P1 (see FIG. 3) where the lower end 2b of the shaft 2 and the hole 1c of the upper drum 1 are in contact with each other. It is the first moving means for moving. Second air cylinder 14
Is the second position P2 in a state where the tip end surface 2a of the shaft 2 is inserted into the hole 1c of the upper drum 1 from the above-mentioned first position P1.
(Refer to FIG. 4) until the shaft 2 and the upper drum 1 are relatively indicated by the arrow Y.
It is a second moving means for moving in the direction. The expansion / contraction direction of the rod 12a of the first air cylinder 12 is parallel to the expansion / contraction direction of the rod 14a of the second air cylinder 14, but the direction is opposite.

Next, the operation of the shaft inserting device described above will be described with reference to FIG.
Or, it demonstrates based on FIG. In the state of FIG. 2, the first
The rod 12a of the air cylinder 12 is in an expanded state, and the rod 14a of the second air cylinder 14 is in a contracted state. The spring 13 is the first portion 4a of the slide portion 4.
The second portion 4b is held so as not to be displaced. On the upper surface 6a of the pedestal 6 of the base portion 3 shown in FIG.
Is set. The heater 10 is energized from a power source (not shown), and the heater 10 is in a state of heating the upper drum 1 via the pedestal 6. The size of the clearance between the receiving surface 1a of the upper drum 1 and the shaft abutting surface 6b of the pedestal 6 is indicated by the symbol a. In FIG. 2, 2 in FIG.
As shown by the dotted line, the upper end 2a of the shaft 2 is fixed to the V block 11 by an air chuck or the like (not shown).

As shown in FIG. 3, the first air cylinder 1
The rod 12a of No. 2 is contracted, and the slide body 37 is moved to the arrow Y.
Rapidly decrease in the direction of 1. Thereby, the lower end portion 2 of the shaft 2
b reaches the height P1 in contact with the chamfered portion of the inlet of the hole 1c of the upper drum 1. Thus, the first cylinder 12 has the shaft 2
The shaft 2 can be rapidly lowered to a height at which the lower end 2b of the drum contacts the chamfered portion of the hole 1c of the drum 1. Thus, the chamfered portion of the lower end portion 2b of the shaft 2 and the hole 1c of the upper drum 1
The step of lowering the shaft to a height at which the chamfered portion of the inlet of the contact is called the first step insertion step.

Next, as shown in FIG. 4, the rod 14a of the second cylinder 14 is extended, preferably slowly, in the direction of arrow Y1. As a result, the slide portion 4 is lowered in the direction of the arrow Y1 with respect to the slide body 37 via the slider 16, and the lower end portion 2b of the shaft 2 is completely inserted into the hole 1c of the upper drum 1. As shown in FIG. 4, when the shaft 2 is inserted into the hole 1c of the upper drum 1, the impact of the insertion of the shaft 2 and the tolerance of the length of the shaft 2 depend on the spring 13 of the slide portion 4. It is absorbed by stretching. In the state of FIG. 4, the lower end portion 2b of the shaft 2 is in contact with the shaft abutting surface 6b of FIG. Therefore, the end surface of the lower end portion 2b of the shaft 2 is in a state of protruding from the upper drum 1 by the amount a. In this way, when the shaft 2 is inserted into the hole 1c, the hole 1c is already heated by the heater, and the diameter of the hole 1c is expanded and expanded.
The shaft 2 can be easily inserted into the hole 1c of the upper drum 1. That is, the shaft 2 can be inserted into the hole 1c of the upper drum 1 by shrink fit.

When the shaft 2 is inserted into the hole 1c, the centering device 90 shown in FIG. 1 adjusts the coaxiality between the center of the shaft 2 and the center of the upper drum 1, that is, the center of the hole 1c of the upper drum 1. It is supposed to be adjusted. That is, in the guide 7 of FIG. 1, the cradle 6 is horizontally moved in the arrow X direction by the retainer 9 and the roller 8 so that the center of the shaft 2 of FIG. , Axis 2 automatically
And the center of the upper drum 1 can be aligned. As described above, when manufacturing the rotary magnetic recording device, when the drum shaft is inserted into the hole of the object such as the upper drum, the first cylinder and the second cylinder that relatively move the shaft and the upper drum. The shaft can be inserted into the hole of the upper drum with high precision and easily by mechanically driving the cylinder. At this time, the upper drum is heated to insert the shaft, and when the shaft is inserted, the center of the shaft and the hole of the upper drum can be aligned.

The shaft 2 is first moved by the first air cylinder 12.
If the speed of moving to the position P1 of 2 and the speed of moving to the second position P2 until the shaft 2 is completely inserted into the hole 1c of the upper drum 1 as shown in FIG. 3 are changed, A quick and stable insertion can be performed. As described above, for example, the speed until the lower end 2b of the shaft 2 reaches the first position P1 is increased, and thereafter, the lower end 2b of the shaft 2 is increased.
It is possible to consider a method in which the speed is relatively slow until the position reaches from the first position P1 to the second position P2.

The present invention is not limited to the above embodiment. In the above-described embodiment, an example of the upper drum of the rotary magnetic head device (rotary magnetic recording / reproducing device or rotary magnetic recording device) is shown as an object, and a drum shaft for attaching to the upper drum is used as the shaft. Shown in the example. However, the present invention is not limited to this, and can be applied to a case where the shaft is attached to the lower drum or the middle drum instead of the upper drum. In the case of the lower drum, the shaft is fixed to the lower drum, and the upper drum rotates about the shaft. In addition to the upper or lower drum,
The present invention can also be applied to a rotary drum device having an attachment attached to an upper drum or the like, when the shaft is directly inserted into the hole of the flange.

Further, in the embodiment of FIG. 1, the type in which the side of the shaft holding means 70 of the shaft 2 is moved and the side of the object holding means 80 holding the upper drum 1 is fixed is shown. Of course, the object holding means may be on the moving side and the shaft holding means may be on the fixed side. Further, even if the centering mechanism 90 shown in FIG. 1 is provided on the shaft holding means 70 side and the object holding means is the fixed side, the same object as in the above-described embodiment can be achieved.

FIG. 5 illustrates another preferred embodiment of the present invention. In the embodiment of FIG. 5, a screw 18 is adjustably attached to the female screw of the guide 7. The amount of protrusion of the inner end of the screw 18 can regulate the amount of movement of the pedestal 6 in the arrow X direction. The other elements in the embodiment of FIG. 5 are the same as the other elements of the embodiment in FIGS. 1 to 4, so the same reference numerals are given and their description is omitted.

[0026]

As described above, according to the present invention, a shaft such as a drum shaft can be securely and easily inserted into a hole of an object such as an upper drum by shrink fitting.

[Brief description of drawings]

FIG. 1 is a view showing a preferred embodiment of a shaft inserting device of the present invention.

FIG. 2 is a diagram showing an initial state of the shaft inserting device of FIG.

FIG. 3 is a view showing a state in which a tip end surface of a shaft is in contact with an entrance of a hole of an upper drum which is an object.

FIG. 4 is a view showing a state in which the shaft is completely inserted into the hole of the upper drum.

FIG. 5 shows another preferred embodiment of the shaft inserting device of the present invention.

[Explanation of symbols]

 1 Upper Drum (Target) 1c Hole of Upper Drum 2 Shaft 10 Heater (Heating Means) 12 First Air Cylinder (First Moving Means) 14 Second Air Cylinder (Second Moving Means) 70 Shaft Holding Means 80 Object Holding Means 90 Aligning Means 100 Inserting Means

Claims (4)

[Claims] 1. A shaft insertion device for inserting a shaft into a hole of a target object by shrink fitting, comprising: a shaft holding means for holding the shaft; and a hole for holding the target object by heat. An object holding means having a heating means for heating the object for expanding, and a relative movement of the shaft holding means and the object holding means to insert the shaft into the hole of the object. Insertion means, a shaft held by the shaft holding means, and an aligning means for adjusting the coaxiality of the object held by the object holding means. Shaft insertion device. 2. The shaft insertion device according to claim 1, wherein the object is a drum of a rotating magnetic drum device or an accessory thereof. 3. The first moving means for moving the shaft and the object relatively to a first position where the end of the shaft and the hole of the object come into contact with each other. A second moving means for relatively moving the shaft and the object from the first position to a second position where an end of the shaft is inserted into the hole of the object. The shaft insertion device according to claim 2, further comprising: 4. The shaft inserting device according to claim 3, wherein the first moving means and the second moving means are fluid pressure driven cylinders.