JP2501786Y2 - Bearing support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bearing support structure for mounting and supporting a bearing for a rotary shaft on a frame.

[Prior Art] Conventionally, for example, in a printer, as a bearing support structure for mounting and supporting a bearing for penetrating and supporting a platen shaft of a platen on a chassis of a frame, a structure as shown in FIGS. It was taken.

That is, the bearing 20 for penetrating and supporting the platen shaft 19 of the platen 5 is formed in a cylindrical shape, and the mounting groove 21 having a pair of cutout surfaces 21a is provided on the outer periphery thereof. The side plate of the chassis 3 is formed with an introduction groove 22 opening upward and a holding portion 23 continuous to the lower end of the introduction groove 22, and the width of the introduction groove 22 is the width between the cutout surfaces 21a of the mounting groove 21 of the bearing 20. The width of the holding portion 23 is larger than the width of the introduction groove 22 and is formed to be substantially the same as the width of the mounting groove 21 of the bearing 20.

Then, as shown by the chain line in FIG. 5, the mounting groove of the bearing 20
The mounting groove 21 of the bearing 20 is introduced into the holding portion 23 from above the chassis 3 through the introducing groove 22 in a state where both the notched surfaces 21a of the 21 are opposed to both side edges of the introducing groove 22. By rotating the mounting groove 21 by a predetermined angle (about 90 degrees), the outer peripheral surface of the mounting groove 21 engages with the holding portion 23, and the bearing 20 is held in the holding portion 23 without slipping upward from the introduction groove 22. It is like this.

Further, an elastic locking piece 31 is provided on the outer periphery of the bearing 20 so as to project in the radial direction, and an engaging projection 33 capable of engaging with an engaging hole 32 provided in the side plate of the chassis 3 is provided at the tip thereof. ing. Then, as shown by the solid line in FIGS. 5 and 6, after rotating the bearing 20 by a predetermined angle in the holding portion 23, the elastic locking piece
The engagement protrusion 33 of 31 is engaged with the engagement hole 32 of the chassis 3 to prevent the rotation of the bearing 20.

[Problems to be Solved by the Invention] However, in this conventional bearing support structure, since the elastic locking pieces 31 are radially provided on the outer periphery of the bearing 20, the bearing 20 is inserted into the introduction groove of the chassis 3. When it is introduced into the holding portion 23 from 22 and rotated by a predetermined angle, the elastic locking piece 31 is bent in the direction of separating from the side plate of the chassis 3 against its elasticity as shown by the chain line in FIG. Need to let the bearing
There was a problem that installation of 20 was very troublesome.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and its purpose is to easily operate a bearing for penetrating and supporting a rotating shaft with respect to a frame. It is to provide a support structure for a bearing that can be easily attached by.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, an introducing groove for introducing a cylindrical bearing for penetrating and supporting a rotating shaft into a frame and an introducing groove for the introducing groove are provided. Subsequently, a holding part for holding the bearing is formed, and when the bearing is rotated by a predetermined angle in a state where the bearing is introduced into the holding part from the introduction groove, the bearing is prevented from coming out of the introduction groove. The width is formed larger than the width of the introduction groove, and the bearing is provided with a hook that extends in the circumferential direction and is supported by a cantilever so as to be elastically deformable in the radial direction. When the hook is rotated by a predetermined angle, the hook is elastically deformed inward in the radial direction so as to get over the hook and engages with the tip of the hook to prevent the bearing from rotating in the unlocking direction. Provide a stopper so that the bearing is A locking portion is provided to prevent the bearing, which abuts on the stopper, from rotating in the locking direction when the clutch rides over the stopper.

[Operation] In the bearing support structure configured as described above, when the bearing is introduced into the holding portion from the introduction hole of the frame and rotated by a predetermined angle in the locking direction, the hook on the bearing serves as a stopper of the frame. Is elastically deformed inward in the radial direction of the bearing to ride over the stopper, and then the tip of the hook engages with the stopper to prevent the bearing from rotating in the unlocking direction. At this time, the locking portion on the bearing contacts the stopper on the side opposite to the hook, and rotation of the bearing in the locking direction is blocked. Therefore, the bearing can be attached to the holding portion of the frame without coming out of the introduction groove by a simple operation of rotating the bearing in the holding direction of the frame in the locking direction.

[Embodiment] An embodiment in which the present invention is embodied in a bearing support structure for a platen shaft of a printer will be described in detail with reference to the drawings.

As shown in FIG. 2, the frame 1 of the printer has a casing 2 made of synthetic resin with an open upper surface, a chassis 3 made of steel plate disposed in the casing 2, and a synthetic body mounted on the casing 2. The cover 4 is made of resin. The platen 5 is rotatably supported between both side plates of the chassis 3, and a guide rod 6 as a guide member is installed between both side plates of the chassis 3 so as to extend in parallel along the longitudinal direction of the platen 5. There is. The carriage 7 is supported by the guide rod 6 so as to be capable of reciprocating in the longitudinal direction thereof, and the print head 8 for printing on the print sheets P1 and P2 on the platen 5 is mounted on the upper portion of the carriage 7. The ribbon cassette 9 is detachably attached.

The paper guide 10 is formed on the casing 2 close to the outer periphery of the lower part of the platen 5, and extends from the upper paper supply port 11 provided in the cover 4 along the paper guide 10 to the platen 5.
The single-cut printing paper P1 is supplied on top. The rear paper supply port 12 and the lower paper supply port 13 are formed in the rear part and the lower part of the casing 2, and the continuous form printing paper P2 is supplied onto the platen 5 from these paper supply ports 12 and 13. Paper outlet 14 is cover 4
Of the print head 8 formed on the platen 5
Printing paper P1 and P2 printed by
Emitted from 4.

The paper feeding device 15 is detachably attached to the chassis 3 of the frame 1, and as shown by a solid line in FIG. 2, a position facing the paper discharge port 14 on the paper feeding side of the platen 5 and a chain line in the same figure. As shown by, it can be rearranged to a position facing the rear paper supply port 12 on the paper feeding side of the platen 5. Then, the paper feeding device 15
Is located on the paper feed side with respect to the platen 5, after the continuous printing paper P2 supplied from the bottom side of the casing 2 through the lower paper supply port 13 has passed the printing position on the platen 5, The paper feeding device 15 pulls out the paper from the paper discharge port 14. Also, the paper feeding device 15 is the platen 5.
When it is arranged on the paper feeding side with respect to, the continuous paper printing paper P2 is fed by the paper feeding device 15 from the rear paper feeding port 12 onto the platen 5, and then discharged from the paper discharging port 14 after passing through the printing position. To be done.

Next, a support structure for supporting both ends of the platen shaft 19 as a rotation shaft for supporting the platen 5 on both side plates of the chassis 3 of the frame 1 will be described.

As shown in FIGS. 1, 3, and 4, the platen shaft
19 is penetratingly supported by a bearing 20 formed of a synthetic resin material in a cylindrical shape, and its rightward movement is restricted by a pin 18 penetrating perpendicularly to the axial direction of the platen shaft 19. Although not shown, a platen gear for transmitting the rotational driving force to the platen is similarly attached to the outside (right side) of the bearing mounted on the right chassis by pins to prevent the platen from moving to the left. Regulated. A mounting groove 21 having a pair of cutout surfaces 21a is provided on the outer circumference of the bearing 20. The introduction groove 22 that opens upward is formed in the side plate of the chassis 3, and the holding portion 23 is continuous with the lower end of the introduction groove 22.
Is provided. The width of the introduction groove 22 is formed to be substantially the same as the width between the cutout surfaces 21a in the mounting groove 21 of the bearing 20, and the width of the holding portion 23 is larger than the width of the introduction groove 22, so that the bearing 20 is mounted. The groove 21 is formed to have almost the same width.

Then, as shown in FIG. 4, the mounting groove 21 of the bearing 20 is vertically arranged so that both notched surfaces 21a of the mounting groove 21 are opposed to both side edges of the introduction groove 22, and the mounting groove 21 of the bearing 20 is inserted into the chassis 3 Is introduced into the holding portion 23 through the introduction groove 22 from above, and the bearing 20 is rotated by a predetermined angle (about 90 degrees) in this state, whereby the outer peripheral surface of the mounting groove 21 engages with the holding portion 23, The bearing 20 is held in the holding portion 23 without coming out upward from the introduction groove 22.

The hook 24 is formed on the outer periphery of the chassis 3 by cantilever support so as to project from the outside of the chassis 3, extends in the circumferential direction along the outer peripheral surface of the bearing 20, and is elastically deformable in the radial direction of the bearing 20. There is. The stopper 25 is formed by cutting and raising the outside of the chassis 3 on one side of the holding portion 23, and is engageable with the hook 24 of the bearing 20. Then, when the bearing 20 is rotated in the holding portion 23 in the counterclockwise direction in the drawing by a predetermined angle, the stopper 25 engages with the outer peripheral surface of the hook 24, and the hook 24 is elastically deformed inward in the radial direction. Then, the stopper 25 is engaged with the tip of the hook 24 to prevent the bearing 20 from rotating in the unlocking direction (clockwise direction).

The locking portion 26 is formed on the outer circumference of the bearing 20 so as to be opposed to the tip of the hook 24 at a predetermined interval, and is engaged with the stopper 25 on the chassis 3. And
When the hook 24 gets over the stopper as the bearing 20 rotates, the locking portion 26 contacts the stopper 25 to prevent the bearing 20 from rotating in the locking direction.

The engaging piece 27 is formed by cutting and raising the outside of the chassis 3 in the vicinity of the lower portion of the stopper 25, and is engaged with the hook 24 of the bearing 20. Then, with the tip of the hook 24 being engaged with the stopper 25 and the rotation of the bearing 20 in the unlocking direction being blocked, the engaging piece 27 engages with the outer peripheral surface of the hook 24, It is designed to prevent the elastic deformation of 24 in the radial direction. That is, at this time, the stopper 25
Is sandwiched between the tip of the hook 24 and the locking portion 26, and cannot rotate in any direction.

Next, the operation of the support structure of the bearing for the platen shaft configured as described above will be described.

Now, as shown in FIG. 4, with both cutout surfaces 21a of the mounting groove 21 of the bearing 20 vertically arranged so as to face both side edges of the introduction groove 22, the mounting groove 21 of the bearing 20 is inserted into the chassis 3 When the bearing 20 is rotated counterclockwise by a predetermined angle (about 90 degrees) while being introduced into the holding portion 23 through the introduction groove 22 from above, as shown in FIG. Face is holding part 23
And the bearing 20 is held in the holding portion 23 without coming out upward from the introduction groove 22.

Further, when the bearing 20 is rotated by a predetermined angle in the holding portion 23, the hook 24 of the bearing 20 is elastically deformed inward in the radial direction of the bearing 20 due to the engagement with the stopper 25 on the chassis 3 side. 25, and then, as shown in FIG. 1, the tip of the hook 24 engages with the stopper 25 and the bearing 20
Is prevented from rotating in the unlocking direction (clockwise in FIG. 1). At this time, the locking portion 26 of the bearing 20 contacts the stopper 25 on the side opposite to the hook 24, and the rotation of the bearing 20 in the locking direction (counterclockwise direction in the figure) is blocked. Therefore,
The bearing 20 can be non-rotatably attached and held on the holding portion 23 of the chassis 3 by a simple operation in which the bearing 20 is rotated in the locking direction while being introduced into the holding portion 23 of the chassis 3.

Further, when the bearing 20 is attached, the first
As shown in the figure, the engagement piece 27 on the chassis 3 side is in a state of being engaged with the outer peripheral surface of the hook 24. Therefore, the bearing in this state
Even if the hook 24 tries to elastically deform outward in the radial direction due to a rotational force acting in the unlocking direction (clockwise direction in FIG. 1) on the hook 20, the elastic deformation is surely prevented by the engagement piece 27. It

Note that the present invention is not limited to the configuration of the above-described embodiment. For example, the bearing 20 is rotated by a predetermined angle in the holding portion 23 of the chassis 3, and the hook 24 and the locking portion 26 of the bearing 20 and the chassis 20 are rotated. By engaging with the stopper 25 on the 3 side, the bearing
The bearing 20 is fixed to the chassis 3 with a fixing screw in a state in which the rotation of the bearing 20 in the unlocking direction and the locking direction is prevented, and the mounting play of the bearing 20 is removed. It is possible to embody it by arbitrarily changing it within a range not departing from the gist of the present invention, such as implementing a bearing support structure for a rotating shaft different from the platen shaft 19 of FIG.

[Advantages of the Invention] Since the present invention is configured as described above, it has an excellent effect that it can be easily attached to a bearing frame for penetrating and supporting a rotating shaft by a simple operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of essential parts showing an embodiment in which the present invention is embodied in a bearing support structure for a platen shaft of a printer.
The figure is a partial cross-sectional view of the printer, FIG. 3 is a partial cross-sectional view of the support structure thereof, FIG. 4 is a partial side view showing the process of mounting the bearing on the frame, and FIG. 5 is a part showing the conventional bearing support structure. A side view and FIG. 6 are partial cross-sectional views of the support structure. 1 ... Frame, 3 ... Chassis, 5 ... Platen, 19
...... Platen shaft as rotary shaft, 20 …… Bearing, 22 …… Introduction groove, 23 …… Holding part, 24 …… Hook, 25 …… Stopper,
26 …… Locking part.

Claims (1)

(57) [Scope of utility model registration request] 1. An introduction groove (22) for introducing a cylindrical bearing (20) for penetrating and supporting a rotary shaft (19) with respect to a frame (1), and following the introduction groove (22). A holding part (23) for holding the bearing (20) is formed, and when the bearing (20) is introduced from the introduction groove (22) into the holding part (23) and rotated by a predetermined angle, the bearing ( Hold the holding part (2) so that the (20) does not come out from the introduction groove (22).
The width of 3) is formed to be larger than the width of the introduction groove (22), and the bearing (20) is provided with a hook (24) extending in the circumferential direction thereof and cantilevered so as to be elastically deformable in the radial direction. In the frame (1), when the bearing (20) is rotated by a predetermined angle in the holding portion (23), the hook (24) is elastically deformed inward in the radial direction and passed over. ,
A stopper (25) for engaging the tip of the hook (24) to prevent the bearing (20) from rotating in the unlocking direction is provided, and the hook (24) is provided as a stopper on the bearing (20). A bearing (26) provided with an engaging portion (26) for preventing the bearing (20) from rotating in the locking direction by coming into contact with the stopper (25) of the bearing (25). Support structure.