JPH06210916A - Temporary fixing structure of shaft - Google Patents

Abstract

PURPOSE:To provide a structure capable of easily performing shaft attaching work and capable of simplifying a mechanism even when automatic assembling is performed. CONSTITUTION:An energizing member 40 energizing the shaft 21 supported at both ends thereof by a pair of the slots 32 formed to a frame 30 and curved at one ends thereof to be opened to the curved parts 33 of the slots from the inside to the outside is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft temporary fixing structure. In particular, the present invention relates to a temporary fixing structure of a shaft whose both ends are movably supported by an elongated hole of which one side is open.

[0002]

2. Description of the Related Art The structure shown in FIG. 8 is often found in various devices in the related art (for example, the actual open flat plate 3-9).
7436 publication).

In the figure, 1 is a frame of the apparatus, 2 is an elongated hole formed in the frame 1, and 3 is a shaft whose both ends 3a (only the front side is shown) are movably supported by the elongated hole 2. A roller or the like (hereinafter simply referred to as a roller) 4 is provided on the shaft 3.
Is provided. Reference numeral 5 denotes a roller whose shaft 6 is fixed to the frame at a portion not shown. A compression spring 7 is provided between the shaft 3 and the frame 1, and the action of the compression spring 7 biases the roller 4 toward the other roller 5.

[0004]

In the structure as described above, the shaft 3 is usually mounted so as to bridge the frame 1. Therefore, the length L2 of the shaft 3 (see FIG. 9) is longer than the interval L1 of the frame 1.

Therefore, in order to mount the shaft 3 in the long hole 2 of the frame, the shaft 3 is first tilted and inserted between the frames 1 as shown in FIG. 9, and then is rotated as shown by an arrow A. The shaft is moved as shown by arrow X1 so that one end of the shaft is inserted into one of the elongated holes 2. Next, the one end is moved in the direction of the arrow X2 so that the one end does not come out from the long hole 2, and the other end is put into the other long hole 2.

After that, an E-ring or the like (not shown) is fitted to the shaft end to complete the mounting of the shaft.

However, such work needs to be inserted between the frames 1 in a state where the shaft 3 is tilted, and further, a moving operation to the arrow X1 accompanied by a rotating operation to the arrow A direction,
Since the movement operation in the direction of arrow X2 is required, it is very complicated. In particular, when performing automatic assembly, there is a problem that the mechanism becomes complicated.

As a solution to such a problem,
As shown in FIG. 10, there is one in which one end of the elongated hole 2 is opened (the open portion is indicated by 2a) (for example, Japanese Patent Laid-Open No. 2-4127)
7 publication).

With such a structure, it is sufficient to drop the shaft 3 into the elongated hole 2, so that the shaft itself can be easily assembled.

However, this structure causes the following problems.

That is, when the shaft 3 is incorporated, the spring 7
In order to prevent the shaft 3 from jumping out from the open portion 2a, it is necessary to provide an unnecessary temporary fixing member 8 as shown in FIG. 11 until the roller 5 is attached in a later step. Will occur.

When the spring 7 is installed after the roller 5 is attached, the movable range of the shaft 3 is already in the range of the roller 5.
Since it is regulated by, it becomes difficult to assemble the compression spring 7 between the shaft 3 and the frame 1.

An object of the present invention is to solve the above problems, to facilitate the work of attaching the shaft, and to simplify the mechanism even when performing automatic assembly. To provide a temporary fixing structure.

[0014]

In order to achieve the above object, a shaft temporary fixing structure according to a first aspect of the present invention is provided with a pair of elongated holes formed in a frame and having one end curved and opened. A shaft having both ends supported by the slot and a biasing member for biasing the shaft toward the curved portion of the slot from the inside toward the outside are provided.

According to a second aspect of the present invention, there is provided the temporary shaft fixing structure according to the first aspect, wherein the biasing member includes a coil portion, an arm portion extending from the coil portion, and the arm portion. Is formed by bending the tip of the shaft, and the shaft is sandwiched between the acting part and the curved portion of the elongated hole.

[0016]

According to the structure for temporarily fixing a shaft according to claim 1, since one end of the elongated hole formed in the frame is open, the shaft can be easily elongated by dropping the shaft into the elongated hole from this opening. Can be incorporated into holes.

The open portion of the elongated hole is curved, and the shaft is urged by the urging member from the inside toward the outside of the curved portion, so that the curved portion does not jump out from the open portion. Is temporarily fixed at.

That is, according to this structure, since one end of the long hole is open, the shaft can be easily assembled, and yet, even though one end of the long hole is open, it is necessary in the prior art. The shaft can be temporarily fixed without the need for a temporary fixing member as described above.

According to the shaft temporary fixing structure of the second aspect,
In the temporary fixing structure of the shaft according to claim 1, the urging member is
A coil portion, an arm portion extending from the coil portion, and an action portion formed by bending a tip of the arm portion are provided, and the shaft is sandwiched between the action portion and the curved portion of the long hole. Therefore, the shaft is securely fixed temporarily.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially omitted side view showing an embodiment of a temporary fixing structure of a shaft according to the present invention applied to a paper discharging mechanism of a printer, and FIG. 2 is a partial front view (a view taken along an arrow II in FIG. 1). ).

First, the paper discharge mechanism will be briefly described. A paper (not shown) is wound around the paper feed roller 10 and supplied to the printing unit 12 via the pinch roller 11.
Inkjet head 13 mounted on the carriage 14
The paper printed at 1 passes through the paper ejection roller 15 and the star wheel 20 arranged opposite to the paper ejection roller 15 and the paper ejection port 16
Emitted from.

The shaft temporary fixing structure according to the present invention is applied to the shaft 21 of the star wheel 20.

An exploded perspective view around the star wheel 20
It is shown in FIG. 3 with the top and bottom reversed.

As shown in FIG. 3, the star wheel 20
Are fixed to both ends of the shaft 21. The shaft 21 includes a large-diameter portion 22, a medium-diameter portion 23 formed in the center of the large-diameter portion 22, and small-diameter portions 24 formed outside the star wheel 20 at both ends of the large-diameter portion 22.

In FIGS. 1 to 3, reference numeral 30 denotes a frame, and a part of the frame is bent to form a pair of support portions 31 of the shaft 21 of the star wheel 20. A long hole 32 is formed in the support portion 31, and the small diameter portion 24 of the shaft 21 is supported in the long hole 32 so as to be vertically movable. One end of the long hole 32 is curved and opened. The curved portion is indicated by reference numeral 33.

Reference numeral 40 denotes a biasing member, and in this embodiment, a coil portion 41 and an arm portion 4 extending from the coil portion 41.
2 and an action portion 43 formed by bending the tip of the arm portion 42 into an L-shape.
The urging member 40 has the coil portion 41 inserted into the tongue piece 34 formed on the frame 30.
Is attached to. One end 44 of the biasing member 40 extending in the direction opposite to the arm portion is engaged with a V-shaped hole 35 formed in the frame 30, and the arm portion 42 has the arm portion 42.
The star wheel 20 is urged toward the paper discharge roller 15 by engaging with the middle diameter portion 23 and pushing it downward.

In such a structure, the paper discharge roller 1
Since the paper discharge roller 15 comes into contact with the star wheel 20 after 5 is assembled, the shaft 21 is prevented from jumping out of the elongated hole 32. However, after the shaft 21 is assembled, the paper discharge roller 15 is assembled. Since it is not possible to obtain the regulation by the paper discharge roller 15, it is necessary to temporarily fix the shaft 21.

In this embodiment, temporary fixing is performed as follows.

In order to assemble the shaft 21, first, as shown in FIG. 3, the coil portion 41 of the urging member 40 is inserted into the tongue piece 34 formed on the frame 30, and the one end 44 is made into the V-shape.
The shaped hole 35 is engaged. Next, the arm portion 42 is pushed down below the open portion of the elongated hole 32, as indicated by a phantom line. In this state, the small diameter portions 24, 24 at both ends of the shaft 21 are inserted into the elongated holes 32, 32. After that, when the arm portion 42 is released, as shown in FIG. 4, the acting portion 43 of the biasing member 40 engages with the medium diameter portion 23 of the shaft 21, and the small diameter portion 24 of the shaft 21 with respect to the curved portion 33 of the elongated hole 32. The lever is urged from the inside to the outside (the urging force is indicated by arrow F).

In this way, the shaft 21 is temporarily fixed in a state of being sandwiched between the acting portion 43 and the curved portion 33 of the elongated hole 32.

After that, when the paper discharge roller 15 is incorporated, the paper discharge roller 15 contacts the star wheel 20 so that the shaft 21 moves against the urging force of the urging member 40, as shown in FIG. It becomes such a state.

Next, an example of automatic incorporation of the shaft 21 using a robot hand will be described.

First, as shown in FIG. 5, the action portion 43 of the biasing member 40 is grasped by the chuck portion 51 of the first robot hand, and the coil portion 41 is moved to the tongue piece 34 as shown by an imaginary line.
And the one end 44 is engaged with the V-shaped hole 35.

Next, as shown in FIG. 6, the cylinder 52 of the second robot hand is used, and the jig 52a provided at the rod tip of the second robot hand is used to move the arm portion 42 from the open portion of the slot 32 as shown by the phantom line. Also push down.

Thereafter, as shown in FIG. 7, the chuck portion 53 of the third robot hand grips the medium diameter portion 23 of the shaft 21, and the small diameter portions 24, 24 at both ends of the shaft 21 are inserted into the elongated holes 32, 32. .

Thereafter, when the chuck portion 53 is returned to its original position and the jig 52a is retracted, the shaft 21 is temporarily fixed as described above.

As described above, according to the temporary fixing structure of the shaft of this embodiment, one end of the elongated hole 32 formed in the frame 30 is open, so that the shaft 21 is extended from the open portion to the elongated hole 32. The shaft 21 can be easily incorporated into the elongated hole 32 by dropping it into the hole 32.

The open portion of the elongated hole 32 is curved, and the shaft 21 is biased by the biasing member 40 from the inside toward the outside of the curved portion 33, so that the shaft 21 pops out from the open portion. Instead, it is temporarily fixed at the bending portion 33.

That is, according to such a structure, the long hole 3
Since one end of 3 is open, the shaft 21 can be easily assembled, and even though one end of the elongated hole is open, a temporary fixing member that is conventionally required is required. The shaft 21 can be temporarily fixed without the need.

Further, the biasing member 40, the coil portion 41,
An arm portion 42 extending from the coil portion 41 and an action portion 43 formed by bending the tip of the arm portion 42 are provided, and the shaft 21 is provided between the action portion 43 and the curved portion 33 of the long hole.
Since the shaft 21 is sandwiched, the shaft 21 is reliably fixed temporarily.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified and implemented within the scope of the gist of the present invention.

For example, although the torsion spring is used as the urging member in the above embodiment, the present invention is not limited to this. For example, even if a leaf spring is used, the same effect can be obtained. What is important is that the biasing member exerts a biasing force on the curved portion from the inside to the outside thereof, and the component force of the biasing member with respect to the shaft toward the opening of the slot is reduced. Therefore, the biasing member may be a coil spring or the like. Therefore, it is possible to adopt various layouts of the biasing member and the elongated hole, the shape of the shaft, and the like.

[0044]

According to the present invention, the work of attaching the shaft can be easily performed, and the mechanism can be simplified even when the automatic assembly is performed.

[Brief description of drawings]

FIG. 1 is a partially omitted side view showing an embodiment of a temporary fixing structure of a shaft according to the present invention applied to a paper discharge mechanism of a printer.

FIG. 2 is a partial front view of the same (view along arrow II in FIG. 1).

FIG. 3 is an exploded perspective view in which the top and bottom of the main part are also reversed.

FIG. 4 is an operation explanatory view.

FIG. 5 is an assembly process diagram using a robot hand.

FIG. 6 is an assembly process diagram using a robot hand.

FIG. 7 is an assembly process diagram using a robot hand.

FIG. 8 is an explanatory diagram of a conventional structure.

FIG. 9 is an explanatory diagram of a conventional structure.

FIG. 10 is an explanatory view of another conventional structure.

FIG. 11 is an explanatory view of another conventional structure.

[Explanation of symbols]

 21 axis 30 frame 32 long hole 33 curved portion 40 torsion spring 41 coil portion 42 arm portion 43 action portion

Claims (2)

[Claims] 1. A pair of elongated holes formed in the frame, one end of which is curved and open, a shaft whose both ends are supported by the elongated holes, and the shaft with respect to the curved portion of the elongated hole. A temporary fixing structure of a shaft, comprising: a biasing member that biases the inside from the outside. 2. The urging member includes a coil portion, an arm portion extending from the coil portion, and an action portion formed by bending a tip of the arm portion. The action portion and the curved portion of the elongated hole. The shaft temporary fixing structure according to claim 1, wherein the shaft is sandwiched between the shaft and the shaft.