JPH08267372A - Method and device for press-fitting cylindrical work - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for press-fitting a cylindrical work (bearing inner ring) into a receiving work (bearing outer ring) without trouble such as floating when assembling bearings used in a copying machine or the like. [Structure] A press-fit pin portion 1 having a shaft 9 protruding downward is lowered onto a cylindrical work piece 22, and the cylindrical work piece 22 is held and then pulled up.
Move to the upper side of the receiving work 22 while pushing backward,
The press-fit pin portion 1 is lowered to press-fit the tubular work 22 into the receiving work 21, and the shaft 9 is extracted and housed in the shaft support 5, and the press-fit pin portion 1 is pulled upward and at the same time the shaft 9 is supported by the shaft support 5. Make it more prominent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cylindrical work (for example, a bearing inner ring of oil-impregnated resin) when assembling an oil-impregnated bearing used as a bearing of a roller used in a printer or an electronic copying machine. The present invention relates to a method and a device for press-fitting a received work (for example, a bearing outer ring made of metal or the like).

[0002]

2. Description of the Related Art First, a work handled by the conventional method and the press-fitting method according to the embodiment of the present invention is a bearing used for a developing roller of an electronic copying machine. As shown in FIG. The cylindrical work 2 is placed in the recess 24 of the delivery work 21.
2 is press-fitted, and the developing roller shaft (not shown) is in the center
Is formed on a single bearing that supports the. The cylindrical work 22 is an oil-impregnated resin molded product, and has a ring shape as shown in FIG. 4 (c / d), and the receiving work 21 is a metal cylinder, and the cylindrical work 22 is received at the upper part. A concave portion 24 is formed (FIG. 4 (a / b)). The hollow portion 23 of the cylindrical work 22 serves as a hollow portion for supporting the shaft of the developing roller and for inserting the shaft 9 (see FIG. 2) of the press-fit pin portion 1 described later.

A conventional general cylindrical work press-fitting method is, as shown in FIG. 5, a receiving work 21 and a cylindrical work 22.
Are placed at predetermined positions, and the work press-fitting pin 20 (corresponding to the press-fitting pin portion of the present invention) is lowered from above the cylindrical work 22 to move the shaft 9 ′ into the hollow portion 23 of the cylindrical work 22. Insert and hold. When the work press-fitting pin 20 is lifted, the cylindrical work 22 is lifted while being fitted to the shaft 9 ′ (FIG. 5 (b)). The dimensional accuracy of the outer diameter of the shaft 9 ′ and the inner diameter of the hollow portion 23 of the tubular work 22 and the elasticity of the tubular work 22 are fitted and held. The work press-fitting pin 20 moves above the receiving work 21 and then moves down to press the cylindrical work 22 into the recess 24 of the receiving work 21 (FIG. 5C). When the work press-fitting pin 20 is pulled up, the cylindrical work 22 is attached to the receiving work 21 and one step is completed (FIG. 5 (d)). It is considered that the cylindrical work 22 can be attached to the receiving work 21 depending on the dimensional accuracy and elasticity of the cylindrical work 22, but also on the dimensional difference between the outer peripheral length and the inner peripheral length of the cylindrical work 22. To be

[0004]

As described above, in the conventional press-fitting method for the cylindrical work, the fitting force between the inner peripheral surface of the cylindrical work and the outer peripheral surface of the shaft and the outer peripheral surface of the cylindrical work and the receiving surface are received. Due to the difference in the fitting force with the inner peripheral surface of the delivered work, the cylindrical work can be attached to the received work. Therefore, in principle, since the contact area of the latter (between the cylindrical work and the receiving work) is larger than that of the former (between the shaft and the cylindrical work), the cylindrical work becomes the receiving work. Once installed, only the shaft can be pulled up. However, the fitting force is influenced by the dimensional accuracy as well as the contact area, and the latter dimensional accuracy (between the cylindrical work and the receiving work) is better than the dimensional accuracy of the former (between the shaft and the cylindrical work). If it is bad (the latter gap is larger than the former gap), when the cylindrical work 22 is attached to the shaft when the cylindrical work 22 is pulled up after press-fitting the cylindrical work into the receiving work (Fig. 6 (a)), or the tubular work may be left in a partially lifted state (FIG. 6 (b)). In this case, it is necessary to stop the device and correct the position manually by the operator.

The present invention has been made in view of the above points,
An object of the present invention is to provide a work press-fitting method and device capable of eliminating the above-mentioned problems such as floating.

[0006]

In order to achieve the above object, a method of press-fitting a cylindrical work according to the present invention is as follows: 1) A press-fitting pin portion having a shaft protruding downward is lowered from above the cylindrical work, Holding the cylindrical work on the shaft and then pulling it up, 2) moving the press-fitting pin part holding the cylindrical work above the receiving work, and pushing the push plate backward by the press-fitting pin part, 3) the cylindrical form The press-fit pin portion holding the work is lowered to press-fit the tubular work into the received work, and the shaft is extracted from the tubular work and stored in the shaft support, and 4) the press-fit pin portion is pulled up. After the shaft is projected from the shaft support by the pressing plate, the press-fitting pin portion is moved above the next cylindrical work.

In order to achieve the above object, the cylindrical work press-fitting device of the present invention comprises: a) a vertically moving shaft which is slidably supported in a vertical direction on a frame and has a bearing attached to a lower end thereof; A pick and press machine having an operation unit attached so as to be slidable in the horizontal direction;
b) a push plate pivotally attached in a vertical direction to a push plate support attached to the frame; and c) a shaft vertically attached to the tip of the operation unit, and a shaft support and a press fit for inserting and removing the shaft. And a press-fit pin portion having a pin support.

In the press-fitting device according to claim 3, d) the press-fitting pin portion is provided with a shaft support and a press-fitting pin supporter for supporting the shaft slidably in the vertical direction in the center thereof.
e) The shaft has a contact part on the upper part, the lower part has a tip part that fits into the inner diameter of the cylindrical work, and a dog supported by a compression coil spring is attached in the middle thereof, f) the shaft support Is a tubular shape positioned on the outer periphery of the lower portion of the shaft, and supports the shaft and the compression coil spring by a linear bush provided therein; g) the press-fit pin support is tubular and the lower portion of the shaft is the shaft. A spring plunger that is joined to the upper part of the support, has a projecting opening for the shaft on the upper part, and has a protruding part connected to the operation unit on the side surface, and further projects a pin on the inner surface at a position corresponding to the dog of the shaft. Is provided.

[0009]

According to the method of press-fitting a cylindrical work of the present invention having the above-described structure, first, the press-fitting pin portion having the shaft protruding downward is lowered onto the cylindrical work, and the hollow portion of the cylindrical work is inserted. Insert the shaft. As described in the section of the related art, the cylindrical work is easily held on the shaft by fitting the outer diameter of the shaft and the inner diameter of the cylindrical work.

The press-fitting pin portion holding the cylindrical work is moved up and moved horizontally to a position above the received work. At this time, the press-fitting pin portion pushes the pushing plate, which will be described later, in the horizontal direction to retract it. This is because the push plate is attached above the receiving work below the contact portion (upper end of the shaft) of the press-fitting pin portion in order to project the shaft, which will be described later, from the shaft support.

The press-fitting pin portion is lowered, the tubular work is press-fitted into the recess of the receiving work, and the shaft is taken out from the tubular work and stored in the shaft support. When the cylindrical work is lowered onto the received work, first the lower end of the cylindrical work fits into the concave part of the received work, and then the press-fit pin part is lowered to push down the cylindrical work by the shaft support. Is press-fitted into the receiving work. In this state, an upward force is applied only to the shaft, and only the shaft is pulled out from the cylindrical work and stored in the shaft support. As a result, the tubular work is completely released from the shaft and is securely attached to the receiving work, so that the tubular work does not move (lift) when pulling up the press-fitting pin portion.

When the press-fitting pin portion is raised, the contact portion of the press-fitting pin portion abuts on the push plate located above it, and when it is further raised, the shaft projects below the shaft support. As a result, the next cylindrical work can be held. In this state, the press-fitting pin portion is moved above the next cylindrical work, and the press-fitting operation is started.

According to a second aspect of the present invention, there is provided a press-fitting device which is slidably supported on a frame in a vertical direction and has a lower end to which a bearing is attached, and a vertically moving shaft, and the bearing is horizontally slidably attached to the shaft. And a pick and press machine having an operating unit. The operation unit moves up and down as the up-and-down operation shaft slides in the up-and-down direction, and can be horizontally slid by being supported by bearings. It is possible to move vertically and horizontally between and the press-fitting position.

Each of the operating unit and the vertical operating shaft is connected to an end of an arm, one end of which abuts on a rotating cam and an intermediate portion of which is pivotally attached to the frame. By rotating the cam designed according to the intended movement of the press-fit pin portion at a predetermined speed, the operation unit can move in the horizontal and vertical directions.

In the push plate supporting member, the push plate is rotatable in the vertical direction, and the push portion (the lower portion of the push plate, the portion of the press-fitting pin portion that abuts the upper end of the shaft) always faces downward by its own weight. Is installed as. When the press-fitting pin part holds the cylindrical work and moves above the receiving work, the pushing part is temporarily pushed away by the upper end (abutting part) of the press-fitting pin part, but when the press-fitting pin part descends. It automatically turns downward and acts as a push plate. This is because the push plate is L-shaped and the lower push portion forms a protrusion.

Since the press-fitting pin portion is vertically attached to the operating unit, it can be held up and down to hold the cylindrical work by the tip portion of the shaft provided at the lower end thereof. Further, the press-fitting pin portion has a shaft support capable of inserting and removing the shaft, and the shaft support plays a role of press-fitting the cylindrical work into the receiving work and presses the shaft from the shaft support. It serves to hold the received work when removing it. The press-fit pin support has a mechanism that allows the shaft to be vertically attached to the operation unit and allows the shaft, which will be described later, to be inserted and removed from the shaft support.

In the press-fitting device according to the third aspect, the press-fitting pin portion includes the shaft, the shaft support and the press-fitting pin support. The shaft is slidably supported in the vertical direction at the center of the press-fit pin portion. A contact part is formed on the upper end of the shaft, and after pressing the cylindrical work into the receiving work,
When pulling up the press-fitting pin portion, it hits the push plate and pushes the shaft downward from the shaft support.
Since the lower end of the shaft has a tip portion that fits inside the cylindrical work, the cylindrical work can be held on the cylindrical work base due to its dimensional accuracy. Further, a dog whose lower portion is supported by a compression coil spring is provided near the center of the shaft, and is supported by a pin provided in a press-fit pin support tool described later.

The shaft support has a tubular shape and is located below the shaft. The shaft support has a linear bush therein to support the shaft slidably in the vertical direction. Further, the shaft support not only pressurizes the tubular work held by the shaft into the receiving work, but also suppresses the tubular work while removing the shaft, and further pulls out the shaft. To store.

The press-fitting pin support is attached to the tip of the operation unit, has a tubular shape, passes the shaft vertically inside, and connects the shaft support to the lower part. Further, a spring plunger is provided on the side surface corresponding to the position of the dog attached to the shaft. The dog is pushed upward with a predetermined force by a compression coil spring whose lower portion is supported by an upper portion of a shaft support.

The action of the dog in this configuration will be examined.
Before starting the work, the dog is set so as to contact the lower portion of the pin in a state where the shaft projects downward from the shaft support. The position of the dog is determined by the balance between the strength (A) of the spring plunger, the strength (B) of the compression coil spring, and the external force (C) applied to the shaft. That is, when inserting the shaft into the cylindrical work, A is larger than (B + C) and the shaft does not move. When the cylindrical work is press-fitted into the receiving work and the shaft is pulled out from the cylindrical work, (B + C) becomes larger than A, and the dog moves over the pin to the upper part of the pin. Further, when the press-fitting pin portion is lifted after the press-fitting is completed, when the shaft is projected from the shaft support by the pressing plate (C
-B) becomes larger than A and the dog moves again to the bottom of the pin.

More specifically, when the tubular work is mounted on the shaft, the dog is inserted while being in contact with the lower portion of the pin. When a strong upward force is applied to the shaft when press-fitting the cylindrical work into the receiving work, the dog moves upward beyond the pin, and the force of the compression coil spring moves the shaft further upward to move the entire shaft. Store in the shaft support. After the press-fitting of the cylindrical work into the received work, when the press-fit pin part is pulled up, the upper end (abutting part) of the shaft hits the pushing part of the push plate and strongly holds down the shaft. Is in a state of crossing the pin downward and abutting against the lower part thereof, and the lower end of the shaft is projected downward from the shaft support to be able to hold the next cylindrical work.

The strength of the compression coil spring cannot push the dog of the shaft upward beyond the pin by itself, but the dog is pushed by the pressing force of the operating unit when the tubular work is press-fitted into the receiving work. When it exceeds the pin, the force of the spring allows the shaft to be pulled out from the cylindrical work.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the cylindrical work press-fitting method and apparatus of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall side view showing an outline of an embodiment of a cylindrical work press-fitting device of the present invention. 2 is a drawing showing a press-fitting pin portion which is one of the main parts of the present invention. FIG. 2 (a) is a sectional view taken along line XX of FIG. 2 (b), and FIG. 2 (b) is the press-fitting portion of FIG. It is a left side view of a pin part. 3 (a) to 3 (d) are explanatory views sequentially showing the operation of the press-fit pin portion and the push plate for operating the press-fit pin portion. 4A and 4B are views showing a cylindrical work and a receiving work handled by the press-fitting device of the present embodiment. FIG. 4A is a plan view of the receiving work, and FIG. 4B is A- of FIG. 4A. A sectional view taken along the line A, FIG. 4 (c) is a plan view of the cylindrical work, and FIG. 4 (d) is B in FIG. 4 (c).
It is a -B line sectional view.

As shown in FIG. 1, the press-fitting device of the present invention has a pick & press machine 30, a push plate support 13 for supporting the push plate 14, and a press fit pin portion 1. The push plate support tool 13 is attached to the frame 32 of the pick and press machine 30, and the push plate support tool 13 is freely rotatable in the vertical direction.
4 is attached to the fulcrum 16. The drive source 33 is provided with a cam (not shown), moves the operation unit 31 in the horizontal direction (arrow X in the drawing) via the left and right drive arms 34, and moves the vertical operation shaft 36 in the vertical direction (via the vertical drive arm 35). Move to the arrow Y). Vertical movement shaft 3
The bearing 6 is slidably attached to the frame 32 in the vertical direction by a bearing 37, and has a bearing 38 at its lower end for supporting the operating unit 31 so as to be slidable in the horizontal direction. By driving the drive source 33 by these, the press-fitting pin portion 1 attached to the end portion of the operation unit 31 can be moved vertically and horizontally. As the pick and press machine 30 used in this embodiment, for example, a gate motion loader / left carry "standard type" X6061 manufactured by Machine Engineering Co., Ltd. is preferably used.

In this embodiment, the press-fit pin portion 1 is attached to the end of the operation unit 31, the press-fit pin portion 1 can be moved horizontally between the pickup position 41 and the press-fit position 40, and the respective positions can be changed. At the cylindrical work table 26
Alternatively, it can be lowered to the position of the receiving work table 25 (see arrow Z in FIG. 1).

Here, the overall operation of this embodiment will be briefly described. First, at the start of work, the operation unit 31 is moved to the right in the drawing, the press-fit pin portion 1 is moved to the position of the imaginary line (pickup position 41), and then the shaft 9 is lowered to project below. The cylindrical work (not shown) supplied from the chute 28 is picked up on the cylindrical work base 26. The press-fitting pin portion 1 holding the tubular work 22 is moved up and moved horizontally to the press-fitting position 40, and lowered to place the tubular work 22 on the receiving work 21 placed on the receiving work table 25. Press fit. Simultaneously with this press fitting, shaft 9
Is pulled out from the cylindrical work 22 and stored in the shaft support 5. After the press-fitting is completed, when raising the press-fitting pin portion 1,
The upper end (abutting portion 11) of the shaft 9 is pressed against the pushing portion 15 of the pushing plate 14 so that the tip end portion of the shaft 9 is projected below the shaft support 5 to return to the state of starting the work.

The press-fit pin portion 1 shown in FIG.
After the cylindrical work 22 is held in the press-fitting position 40, the pressing plate 14 is moved to the press-fitting position 40.
1 shows a state of being pushed away in the left direction of the drawing by 1. When the press-fitting pin portion 1 descends downward, the push plate 14 turns by its own weight so that the pushing portion 15 is downward.

Next, the relationship between the pressing plate 14 and the press-fitting pin portion 1 will be described in detail with reference to FIG. FIG. 3A shows a state in which the press-fitting pin portion 1 is raised by holding the cylindrical work 22 on the shaft 9 thereof, and the press-fitting pin portion 1 is continuously indicated by an arrow A.
Move in the direction of. FIG. 3B shows a state in which the press-fit pin portion 1 is moved to the press-fit position 40 (see FIG. 1).
The pushing portion 15 of the pushing plate 14 is pushed leftward in the drawing by the hitting portion 11, so that the pushing plate 14 revolves around the fulcrum 16 in the direction of arrow E. The height of this contact portion 11 is
It is designed to be higher than the position of the push portion 15 of the push plate 14 attached to the push plate support 13 (the reason will be described later), and the push plate 14 pivots vertically to the push plate support device 13. This is because it is attached freely. Then, the press-fitting pin portion 1 is lowered in the direction of arrow B.

FIG. 3 (c) shows a state in which the press-fit pin portion 1 is lowered to press-fit the cylindrical work 22 into the receiving work 21 and at the same time the shaft 9 is housed in the shaft support 5 (details will be described later). The push plate 14 shows a state in which the push portion 15 is swung downward. When the press-fit pin part 1 is lowered,
The push plate 14 is released from the contact portion 11 and pivots so that the push portion 15 is located below. Push part 15 of push plate 14
Is because the lower part of the push plate 14 is bent in an L shape, and has a constant area and weight. Subsequently, the press-fit pin portion 1 rises in the direction of arrow C.

FIG. 3 (d) shows a state in which the press-fitting pin portion 1 is pulled up from the state of FIG. 3 (c).
Hits the pushing portion 15 of the pushing plate 14 and is pushed down relatively to project the shaft 9 to the lower portion of the shaft support 5. Then, it moves in the right direction (arrow D) and enters the state of picking up the next cylindrical work 22.

As shown in FIG. 2A, the press-fitting pin portion 1 supports a shaft 9 at the center thereof by a shaft support 5 and a press-fitting pin support 3 so as to be slidable in the vertical direction. The shaft 9 has an abutting portion 11 on an upper portion thereof, a tip end portion for attaching / detaching the cylindrical work 22 on a lower portion thereof, and a dog 10 supported by a compression coil spring 12 in the middle thereof. The compression coil spring 12 is supported on the upper portion of the linear bush 7 provided on the inner surface of the shaft support 5. Since the upper surface of the contact portion 11 is formed in a horizontal plane, the push plate 14 does not rotate and retreat when the press-fit pin portion 1 rises even if the push plate 14 is pivotally attached (contact portion). 1
1 can be suppressed).

The shaft support 5 has a cylindrical shape and is mounted around the lower portion of the shaft 9, and has a linear bush 7 and a collar 17 for supporting the shaft 9 therein. It has a function of supporting the shaft 9 slidably in the vertical direction. The press-fit pin support 3 has a tubular shape and holds the shaft 9 therein and the lower part thereof is the shaft support 5.
Has a projecting opening for projecting the shaft 9 at the upper part. On the side surface of the press-fit pin support tool 3, there is a protrusion 18 that is connected to the operation unit 31, and further, on the inner surface of the shaft 9 at a position corresponding to the dog 10, the pin 8 is provided.
A plunger pedestal 4 having a spring plunger 6 projecting from is attached.

The position of the pin 8, the strength of the spring plunger 6 and the compression coil spring 12, and the shaft 9
The strength and the like of the fitting between the distal end of the and the hollow portion of the cylindrical work 22 are related to each other. That is, although it has already been described in the section of the action, specifically showing this, the shaft 9 and the cylindrical work 2
The force that fits with 2 requires the strength to hold and lift the cylindrical work 22, and when the cylindrical work 22 is press-fitted into the receiving work 21 (the dog 10 crosses above the pin 8), The shaft 9 must be able to be pulled out from the tubular work 22 by the force of the compression coil spring 12.
In other words, the strength of the spring plunger 6 is such that the dog 10 does not exceed the pin 8 only by the force of the compression coil spring 12, but when the tubular work 22 is press-fitted into the receiving work 21, the press-fit pin portion 1 is lowered. The strength is set so that the dog 10 can be passed over the pin 8 by a force. Further, when the press-fitting pin portion 1 is raised, the force (pulling force) that pushes the contact portion 11 of the shaft 9 against the pushing portion 15 causes
It is adjusted so that the dog 10 can be passed under the pin 8.

[0035]

As described above, according to the method of press-fitting a cylindrical work of the present invention, when the cylindrical work is press-fitted into the receiving work, the shaft can be completely removed from the cylindrical work. As a result, the cylindrical work is not pulled up together with the shaft and is not lifted up from the received work. Therefore, even if there is some variation in the dimensional accuracy (outer diameter, inner diameter) of the shaft, the cylindrical work, and the received work, the press-fitting work can be carried out without trouble such as lifting of the received work.

In the press-fitting device according to the second aspect of the present invention, a press-and-press machine is combined with a push plate supporter, an operating unit, and the like, and the shaft of the press-fitting pin portion is used for the progress of the process (pickup, movement, press-fitting, returning of the cylindrical work). ) And project it from the shaft support or store it. That is, by pressing the tubular work by the shaft support during press-fitting, the shaft can be pulled out from the tubular work without moving the tubular work. Further, when pulling up the press-fitting pin portion, at the same time, the shaft is projected downward so that the work can be continued as it is. As a result, the work press-fitting method of claim 1 can be easily carried out, and there is no trouble such as floating.

In the cylindrical work press-fitting device of the third aspect, the relationship between the dog attached to the shaft and the pin projecting inside the press-fitting pin support, and the strength of the compression coil spring and spring plunger supporting them is adjusted, The shaft can be automatically taken in and out from the shaft support by utilizing the up and down force of the press-fit pin portion. After press fitting,
By completely removing the shaft from the cylindrical work, problems such as floating when the cylindrical work is press-fitted do not occur.

[Brief description of drawings]

FIG. 1 is an overall side view showing an outline of an embodiment of a cylindrical work press-fitting device of the present invention. The imaginary line represents the position of the press-fit pin portion before the start of work.

2 is a view showing a press-fitting pin portion which is one of the main parts of the present invention, FIG. 2 (a) is a sectional view taken along line XX of FIG. 2 (b), FIG.
(b) is a left side view of the press-fitting pin portion of FIG. 1.

3 (a) to 3 (d) are explanatory views sequentially showing the action of a press-fit pin portion and a push plate for operating the press-fit pin portion.

4A and 4B are drawings showing a cylindrical work and a receiving work handled by the press-fitting device of the present embodiment, FIG. 4A is a plan view of the receiving work, and FIG. 4B is a view A in FIG. 4A. -A line sectional view, FIG. 4 (c)
Is a plan view of the cylindrical work, and FIG. 4D is a sectional view taken along line BB of FIG. 4C.

5 (a) to 5 (d) are drawings showing a procedure of press-fitting a cylindrical work into a received work by using a conventional work press-fitting device, including a front view of a press-fitting pin and a front view cross section of the work. It is a figure.

FIG. 6 (a) shows a state before press-fitting using a conventional work press-fitting device, and FIG. 6 (b) occurs when a tubular work is press-fitted using a conventional work press-fitting device. FIG. 3 is a front view of the press-fitting pin and a front sectional view of the work, showing a state where the tubular work is lifted up.

[Explanation of symbols]

 1: Press-fit pin part 3: Press-fit pin support 5: Shaft support 6: Spring plunger 7: Linear bushing 8: Pin 9: Shaft 10: Dog 11: Contact part 12: Compression coil spring 13: Push plate support 15: Push Plate 20: Work press-fitting pin 21: Receiving work 22: Cylindrical work 30: Pick and press machine 31: Motion unit 32: Frame 36: Vertical motion shaft 37, 38: Bearing

Claims (3)

[Claims] 1. A method of press-fitting a cylindrical work into a received work, wherein a press-fitting pin portion projecting a shaft at a lower portion is lowered from above the cylindrical work, and the cylindrical work is held on the shaft and then pulled up. The press-fit pin portion holding the cylindrical work is moved above the receiving work, and the press-fit pin portion pushes the push plate to move it backward, and the press-fit pin portion holding the cylindrical work is lowered to move the cylinder While press-fitting the work into the received work, the shaft is extracted from the tubular work and stored in the shaft support, the press-fit pin portion is pulled up, and the shaft is projected from the shaft support by the pressing plate, A method for press-fitting a cylindrical work, characterized in that the press-fitting pin portion is moved above the next cylindrical work. 2. A device for press-fitting a cylindrical work into a received work, which is vertically slidably supported by a frame and has a lower end on which a bearing is mounted, and a horizontal slide on the bearing. A pick-and-press machine having an operation unit attached so that it is possible, a push plate support attached to the frame, a push plate pivotally attached in a vertical direction, and a vertical attachment to the tip of the operation unit, A cylindrical work press-fitting device comprising: a shaft; a shaft support for inserting and removing the shaft; and a press-fit pin portion having a press-fit pin support. 3. The press-fitting pin portion is provided with a shaft support and a press-fitting pin supporter for supporting a shaft slidably in a vertical direction in the center thereof, and the shaft has a contact portion at an upper portion and a tubular shape at a lower portion. It has a tip part that fits into the inner diameter of the work, and a dog supported by a compression coil spring is attached in the middle of the tip part. The shaft support has a cylindrical shape located on the outer periphery of the lower part of the shaft, and is provided inside thereof. The shaft and the compression coil spring are supported by a linear bush, and the press-fit pin support has a tubular shape, a lower part thereof is joined to an upper part of the shaft support, a projecting opening of the shaft is provided on an upper part, and A spring plunger for protruding a pin is provided on the inner surface of the shaft at a position corresponding to the dog, by attaching a protrusion connecting to the operation unit. Item 2. The cylindrical work press-fitting device according to item 2.