JPS5940358Y2 - Roller support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller support structure in a card feeding device for, for example, punched cards or magnetic cards.

The most typical conventional roller support structure in this type of card feeding device is a drive motor (not shown), as shown in FIGS. 1 and 2.

), etc. A pair of drive rollers 2, 2 are fixed to a drive shaft 1, which is driven by a drive shaft 1, and a driven shaft 3 is also provided with a pair of driven rollers 4, 4. is rotatably supported by two side plates 5, 5 as shown.

When the driving rollers 2, 2 are driven in the direction of the arrow in FIG. It is designed to be transferred in the direction of the arrow (the tangential direction of both rollers).

According to this support structure, both shafts 1°3 (both rollers 2,
4) Although it is easy to set the center-to-center distance a with high precision, there is a drawback that it is difficult to assemble and disassemble during maintenance and inspection.

Therefore, a guide groove 6 as shown in FIG.
The driven shaft 3 is inserted into the guide groove 6 from its open end, and after this insertion, the stop plate 7 is fixed to each side plate 5 via the screws 8, 8, thereby fixing the driven shaft 3 to a predetermined position. It is held rotatably in position, and the stop plate 7 is used during maintenance and inspection.
It has also been customary in the past to unscrew and remove the screws 8, 8, thereby making it possible to easily remove the driven shaft 3.

However, in such a separable structure, the conventional structure requires the provision of some other member such as the stop plate 7, which has the drawback of increasing manufacturing costs.

The present invention is an improvement to eliminate the drawbacks of the conventional structure described above, and examples thereof will be described below.

In FIG. 4, a drive roller 12 is fixed to a drive shaft 11, and a driven roller 14 is mounted to a driven shaft 13.

The drive roller 12 is made of a hard material whose outer diameter does not change in order to keep the paper feed amount or speed accurately constant.
In this example metal is used.

), and its drive shaft 11 is connected to both side plates 15.
．． 15, it is rotatably supported in exactly the same way as in the conventional case.

The driven roller 14 is made of elastic rubber, and is arranged so as to come into elastic contact with the drive roller 12 with a predetermined pressure in the supported state shown in FIG.

Further, the structure for mounting the driven roller 14 to the driven shaft 13 may be either a fixed structure or a rotatable structure.

Therefore, the support structure for the driven shaft 13, which is a feature of the present invention, will be explained.

The driven shaft 13 is fitted and held in a terminal end 16b of a guide groove 16 formed in the side plate 15.15 so that one end 16a is open.

The terminal end 16b of the guide groove 16 is formed at a position where the driven roller 14 can come into elastic contact with the drive roller 12 in the above-described relationship in the fitted and held state.

The guide groove 16 is formed at θ (in this embodiment, θ is set at 15°) with respect to a straight line L2 that is parallel to the tangent L1 between the driving roller 12 and the driven roller 14 and passes through the arc center C2 of the terminal end portion 16b. .

) is formed obliquely and linearly toward the drive roller 12 side (downward).

In this example, the open end 16a is provided on the card supply side (left side in FIG. 4), and the driven shaft 13 can be attached or removed from the open end 16a with the driven roller 14 attached. It looks like this.

By making the guide groove 16 have the above structure, the driven shaft 13
When the driven roller 14 is moved along this guide groove, the outermost peripheral surface of the driven roller 14 moves along a straight line (trajectory) L3.

Therefore, a portion 17 (hatched portion) where this locus L3 and the outermost circumferential surface of the drive roller 12 overlap is obtained, and the installation in which the driven shaft 13 is slid and inserted from the open end 16a toward the terminal end 16b is performed at a certain time. On the other hand, during removal, when the driven shaft 13 passes through this overlapping portion 17, it is subjected to great resistance.

That is, when the driven roller 14 passes through this overlapping portion 17, it moves while being compressed.

The resistance due to compression is maximum at the center C1 of the drive shaft 11 (or its bearing hole) and the arc center C2 of the terminal end 16b.
A point P where a straight line L3 extending from the center C1 at an angle θ with respect to the center line connecting the lines intersects with the outer circumferential surface of the drive roller 12.
This is when the driven roller 14 moves.

Next, attachment and detachment of the driven shaft 13 will be explained.

The driven shaft 13 is connected to the guide groove 16 at its open end 16a.
If you insert it from the beginning and slide it to the right, the driven roller 1
When the outer peripheral surface of 4 reaches the overlapping portion 17, it begins to receive resistance.

The driven shaft 13 is forcibly pushed against this resistance.

The resistance increases gradually, reaches its maximum when the outer circumferential surface of the driven roller 14 reaches point P, and thereafter gradually decreases.
After passing this point P, the driven shaft 13 is smoothly advanced to the terminal end 16b of the guide groove 16 by the restoring force of the compressed driven roller 14, and is stably held at that position.

That is, once the driven shaft 13 is fitted into the terminal end 16b, it will not come off from the terminal end 16b unless it is pushed to the left with a force greater than the above resistance.

In this mounting state, the driven roller 14 is in elastic contact with the driving roller 12 with a predetermined pressure, and the driving roller 12 is partially driven in the direction of the arrow (clockwise). 14 is in the direction of the dashed arrow (
counterclockwise).

At this time, the driven roller 14 has the driven shaft 13 at the terminal end 16.
Since a pressing force acts on the b side (right side in FIG. 4), the driven shaft 13 is stably fitted and held at the terminal end 16b even during rotation.

When removing the driven shaft 13, the driven shaft 13 can be removed from the guide groove 16 by performing an operation completely opposite to the above.

According to the support structure according to the present invention described in detail above,
The driven shaft 13 can be fitted and held stably on its own without requiring any separate parts, and therefore can be constructed at low cost, and after-sales service work such as assembly and maintenance inspection can be done extremely quickly. It can be done easily.

Note that the shape of the guide groove 16 is specified only by the scope of the utility model registration claims, and the design can be freely changed as long as it does not deviate from this.

For example, the guide groove 16 may be curved into a slightly arcuate shape, or may be formed into a substantially square shape so that the opening end 16a
may be placed at the upper end of the side plate 15.

[Brief explanation of the drawings] Fig. 1 is a partial sectional view showing the most typical conventional roller support structure, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is another conventional example. FIG. 4 is an enlarged side view showing one embodiment of the roller support structure according to the present invention. 11... Drive shaft, 12... Drive roller, 13... Driven shaft, 14... Driven roller, 15... Side plate, 16 ...Guide groove, 16a...Opening end, 16b...Terminal end, 17...Overlapping portion, θ...Inclination angle.

Claims (2)

[Scope of utility model registration request] (1) In a roller device consisting of a drive shaft rotatably supported on a side plate, a drive roller fixed to the drive shaft, and a driven shaft provided with an elastic driven roller that makes elastic contact with the drive roller. A guide groove is formed in the side plate, and the guide groove is open at one end and rotatably fits and holds the driven wheel at the terminal end, and the guide groove extends from the open end toward the terminal end. Or when moving the driven shaft in the opposite direction,
In the middle of the movement path and near the terminal end,
A roller support structure characterized in that the distance between the driven shaft and the drive shaft is smaller than that at the terminal end. (2) A utility model in which the guide groove has a linear portion that is inclined toward the drive roller at a certain angle with respect to a straight line passing through the center of the terminal end that is parallel to the tangents of both rollers. A roller support structure according to registered claim 1.