JPH0679936A - Recorder - Google Patents

Abstract

PURPOSE:To prevent the generation of abrasion or injuries in the engaging surface between a cam member and a rod, which are used for effecting the opening and closing operation of a clamping member, and restrain the generation of abnormal sound. CONSTITUTION:A rod member 19, movable freely in the axial direction thereof and engaged with a cam member 13 for driving the opening and/or closing of a clamping member when the rod 19 is advanced toward the side surface of a printing drum 1, is formed integrally with a shaft member 19a while an annular member 30 is attached rotatably to the shaft member 19a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus of a type in which a recording medium is wound around a drum for recording.

[0002]

2. Description of the Related Art In a recording apparatus of the above type, for example, a thermal transfer recording apparatus, a transfer paper (image receiving paper) is used as a recording medium, which is wound around a printing drum, and the wound transfer paper is Thermal transfer recording is performed with a thermal head or the like through a heat-melting type or heat sublimation type ink sheet.

When the transfer paper is displaced on the printing drum during such thermal transfer recording, it becomes impossible to record an image at a predetermined position. Further, in a color type thermal transfer recording apparatus that transfers images of colors such as yellow color, magenta color, cyan color (otherwise, black color in some cases), in order to prevent color misregistration, a transfer paper is used. It is essential that there is no gap between the two.

From this point of view, in this type of recording apparatus, the printing drum is provided with a clamp member, and the claw portion provided on the clamp member is opened and closed on the drum to clamp the front end portion of the transfer paper. Or releasing the clamped state.

To clamp the clamp member so that the pawl portion opens and closes on the drum, for example, on the side of the drum,
A cam member is provided and is connected to the clamp member.
A cam member of this type is displaced and driven by a rod provided outside the drum so as to move forward and backward with respect to the drum side portion, and the tip end portion of this rod is engaged with the cam member. When they are fitted together, both the cam member and the tip of the rod are easily scratched. In addition, the engagement surfaces of the rod and the cam member wear during repeated engagement and disengagement with the cam member. As described above, when the engaging surface is scratched or the engaging surface is worn, an abnormal sound is generated when the rod and the cam member slide relative to each other.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent wear and scratches on engagement surfaces of cam members and rods used for opening and closing clamp members,
It is to provide a recording device that suppresses the generation of abnormal sound.

[0007]

In order to achieve the above object, the present invention provides a drum around which a recording medium is wound around an outer peripheral surface,
A clamp member is attached to the drum so as to be freely rotatable and openable, and by rotating and opening and closing, a clamp member that clamps the leading end portion of the recording medium on the drum and releases the clamped state is integrated with the drum. The cam member that rotates integrally with the drum and the cam member that is provided outside the drum and that moves integrally with the drum is displaced so that the clamp member is driven to open and close by the engagement and disengagement of the cam member. The present invention proposes a configuration in which a shaft portion is formed at the tip of one of the rods, and a ring-shaped member serving as an engaging portion with the cam member is rotatably provided on the shaft portion. is there.

It is effective that the ring-shaped member is attached to the shaft portion via a bearing.

Further, it is effective that the ring-shaped member is detachable from the shaft portion.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a partial sectional view of a rod portion provided in a recording apparatus according to an embodiment of the present invention. Before explaining this, the overall configuration of the recording apparatus will be clarified.

FIG. 4 is a schematic configuration diagram of a color thermal transfer recording apparatus which is an example of the recording apparatus.

In FIG. 1, reference numeral 1 denotes a printing drum, which is driven to rotate in the direction of the arrow shown by a driving means (not shown). A transfer paper 3 as an example of a recording medium is accommodated in the paper feed cassette 2, and the transfer paper 3 is sent toward the drum 1 by a paper feed roller pair 4.

The transfer paper sent to the drum 1 is wound around the outer peripheral surface of the drum 1. A clamp member for clamping the front end of the transfer paper during the winding. A drum 5 is attached to the drum 1 to be rotatable and openable. That is, as shown in FIG. 5, the clamp member 5 has its base end portion fixed to the shaft 6, and its free end portion side is branched into a plurality of places.
As shown in FIG. 6, the hole 1a provided in the drum 1 is penetrated, and the hook-shaped claw portion 5A thereof faces the outside of the drum.

The shaft 6 is inserted in the drum and is rotatably supported by the drum. The shaft 6 is adapted to be intermittently rotated at a predetermined angle by means described later,
Along with this, the claw portion 5A opens and closes on the drum.

In FIG. 4, at the start of the recording operation,
First, the claw portion 5A of the clamp member 5 waits in a state of being opened at the position B, and the drum 1 is stopped at this time. Claw part 5A
Is in such a standby state at the time of sheet feeding, and the leading end of the transfer sheet sent from the sheet feeding cassette 2 has an open claw portion 5
Enter between A and drum 1. When the tip portion enters between them, the claw portion 5A is closed and the drum 1 starts rotating.

When the claw portion 5A is closed, the leading end portion of the transfer paper is clamped, and further, when the drum 1 is rotated, the transfer paper is wound around the drum 1.
When the claw portion 5A passes the printing portion 7, the rotation of the drum 1 is temporarily stopped, and in this state, the thermal head 8 descends from the position shown by the broken line, and as shown by the solid line, the ink sheet 9
And, it is pressed against the drum 1 via the transfer paper on the drum 1.

Next, the drum 1 starts to rotate again, and in this rotating state, thermal transfer recording is performed on the transfer paper on the drum 1 via the ink sheet 9. The ink sheet 9 is
At the time of recording, it is fed from the supply-side roll portion 9A and wound around the winding-side roll portion 9B.

When the transfer on the rear end side of the transfer paper is completed, the thermal head 8 rises to the position of the broken line and separates from the drum 1. In the meantime, the leading end positions of the transfer sheets are aligned, and the ink sheet of the next color of the ink sheet 9 is aligned. If the above-mentioned transfer is performed for yellow color, thereafter, transfer of magenta color and cyan color (black color is added in some cases) are sequentially performed respectively, and a predetermined color image is obtained on the transfer paper. To be

When all such transfer is completed, the claw portion 5A opens at the portion C, and the clamped state of the leading end portion of the transfer paper is released accordingly, and the transfer paper on the drum is ejected from the guide plate 10.
Is ejected along the sheet, passes through the pair of sheet ejection rollers 11, and passes through the tray 12
Housed on top.

As can be understood from the above description, the clamp member 5 is attached to the drum 1 so as to be rotatable and openable, and by rotating and opening and closing, the front end portion of the transfer paper is
It functions to clamp the drum and release the clamped state.

As shown in FIG. 7, a clamp member opening / closing drive cam member 13 that rotates integrally with the drum 1 is provided on the side surface of the drum 1. Note that FIG. 6 corresponds to FIG.
I saw the drum from the back, which is the opposite side from. Figure 5
Is also a cross-sectional view seen from this side.

Returning to FIG. 7, the cam member 13 is the drum 1
It has an arm shape that is curved so as to substantially follow the outer peripheral surface thereof, and its base end is fixed to the shaft 6 to which the clamp member 5 (FIG. 5) is attached. A tension spring 16 is hooked between the free end of the cam member 13 and the pin 15 fixed to the side surface of the drum. When the cam member 13 pivotally displaces with the center of the shaft 6 as a fulcrum, the clamp member 5 pivotally opens and closes, and the claw portion 5A closes or opens. In FIG. 5, the solid line shows the state in which the claw portion 5A is closed, and the chain line shows the state in which it is open.

In FIG. 8, the rotation center axis 1A of the drum 1
Are rotatably supported by the main body side plate 17 of the recording apparatus. A guide ring 18 is fixed to the body side plate 17 so as to be parallel to the drum 1, and a rod 19 is fitted into the guide ring 18 so as to be slidable in the axial direction.

The rod 19 is adapted to advance to and retract from the site of the cam member 13, and the plain spring is urged to move in the retreat direction by the extension elasticity of the compression spring 20. There is. A bracket plate 21 is provided on the main body side plate 17.
Is fixed with a screw, and a push-pull solenoid 22 is fixed to the plate 21. Further, a pressing plate 23 is screwed to the bracket plate 21, and the plate 23 is a solenoid 22.
The plunger 22a is pressed against the solenoid body so as not to come off.

When the solenoid 22 is excited, the plunger 22a is pulled into the solenoid body. The virtual line shows the state in which it is drawn. Along with this, the rod 19 advances to the site of the cam member 13, and the tip end portion 19a of the rod 19 engages with the inner cam edge portion 13A (FIG. 7) of the member.

When the drum 1 rotates with the rod 19 thus engaged with the cam member 13, the rod 1 is rotated.
9, the cam member 13 rotating integrally with the drum is rotationally displaced about the center of the shaft 6 as a fulcrum, and this rotational displacement causes the clamp member 5 in a closed state as shown by a solid line in FIG. Open as shown in. That is, due to the elastic elastic force of the spring 16 shown in FIG. 7, the claw portion 5A is in a normal state and closed on the drum 1, and the cam member 13 is relatively pushed by the rod 19 to rotate the spring 16 while extending it. When it is dynamically displaced, the clamp member 5 coaxially integrated with the cam member 13 is rotated, and the claw portion 5A is opened. When the cam member 13 and the rod 19 are disengaged,
The clamp member 5 will be closed.

In this way, the claw portion 5A of the clamp member 5 opens and closes at the above-mentioned predetermined timing to clamp or release the leading end portion of the transfer sheet.

The rod 19 provided outside the drum rotates integrally with the drum 1 so that the clamp member 5 is opened and closed by the engagement and disengagement with the cam member 13.
Works to displace.

Here, in the conventional recording apparatus, the tip end portion 19a of the rod 19 is directly engaged with the inner cam edge portion 13A. Therefore, at the time of this engagement, the engagement surfaces of the tip end portion 19a of the rod 19 and the inner cam edge portion 13A rub against each other, this portion is easily worn, and the engagement surface is liable to be damaged. . If such wear is promoted over time, or if the degree of damage becomes severe over time, the cam member 13 and the rod 19 will not be in a normal engagement state and the rod 19 An abnormal sound may be generated when is relatively slid with the inner cam edge portion 13A. Moreover, the rotation of the drum 1 may be hindered.

The present invention is intended to solve such a problem.

As described above, FIG. 1 is a partial cross-sectional view of the rod portion provided in the present recording apparatus, and is a partially enlarged view of FIG. 8. As is clear from this figure, the rod is 1
A shaft portion having a diameter smaller than that of the main body is formed on the tip portion 19a of the shaft 9. Hereinafter, the shaft portion will be described with reference numeral 19a, and the ring-shaped member 30 made of a wear resistant rigid body such as a metal material is rotatably fitted in the shaft portion 19a. The ring member 30 is a cam member 13.
It is a portion that engages with the inner cam edge portion 13A (FIG. 7). That is, the rod 19 does not directly contact the cam member 13, but the cam member 1 does not come into contact via the ring-shaped member 30.
It abuts 3. The ring-shaped member 30 is caulked so that the shaft portion 19a of the rod 19 is bulged and deformed as shown in the figure so as not to come off from the shaft portion 19a.

When the ring-shaped member 30 engages with the inner cam edge portion 13A of the cam member, the ring-shaped member 30 of the same member then comes into sliding contact with the inner cam edge portion 13A. Accordingly, the ring-shaped member 30 is attached to the shaft portion 1.
It comes to rotate around 9a. Due to such an action, the surface of the ring-shaped member 30 is prevented from being worn or scratched. Further, this prevents an abnormal sound from being generated or the rotation of the drum from being hindered when the rod and the cam member slide relative to each other.

In the rod 19 of the example shown in FIG. 2, the ring-shaped member 30 is attached to the shaft portion 19a via a bearing 31 such as a dry bearing. With such a rod structure, the rotation of the ring-shaped member 30 can be further smoothed, and the wear thereof can be made less likely to occur.

The rod 19 of the example shown in FIG. 3 has a shaft portion 19a.
On the other hand, the ring-shaped member 30 is detachable. That is, the washer 40 is in contact with the outer end of the shaft portion 19a, and the washer 40 is fixed by screwing the screw 41 into the screw hole of the shaft portion 19a.
The washer 40 thus fixed prevents the ring-shaped member 30 from coming off the shaft portion 19a. While using the recording device for a long time, the ring-shaped member 3
The inner peripheral portion of 0, the outer peripheral portion of the shaft portion 19a, or the like is worn, and “play” is generated between the ring-shaped member 30 and the shaft portion 19a. In view of such a point, it is convenient to replace the ring-shaped member 30.

The rod example shown in FIG. 3 is replaceable, and in order to replace an old ring-shaped member with a new one, the screw 41, washer 40, etc. are removed and the ring-shaped member 30 is rotated. The new ring-shaped member 30 is pulled out from the portion 19a and fitted into the shaft portion 19a. Then, washers 40, screws 41, etc. are attached as shown in the figure.

As a means for preventing the ring-shaped member 30 from coming off, an E-ring or the like can be used. Also in the example shown in FIG. 3, the ring-shaped member 30 is attached to the shaft portion 19 via a bearing such as a dry bearing.
It can be attached to a.

The present invention can also be applied to various recording apparatuses other than the thermal transfer recording apparatus, for example, a copying machine of a type in which a toner image formed on a photoconductor is transferred to a transfer paper clamped on a drum. It can also be applied to a recording device such as a copying machine in which the toner image on the photoconductor is transferred to an intermediate transfer member, and then the toner image on the intermediate transfer member is transferred to a transfer paper clamped on a drum. is there.

[0039]

According to the structure of the first aspect of the present invention, the engagement surfaces of the cam member and the rod used for opening and closing the clamp member are less likely to be worn or damaged. It is possible to suppress the generation of abnormal noise that occurs during sliding, and to prevent the rotation of the drum from being disturbed.

According to the second aspect of the present invention, since the ring-shaped member can be smoothly rotated, it is possible to further prevent abrasion of the cam member, the rod and the like, and the durability thereof. It becomes possible to further improve.

According to the third aspect, the ring-shaped member can be replaced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rod portion included in a recording apparatus according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing another example of a rod.

FIG. 3 is a partial cross-sectional view showing still another example of the rod.

FIG. 4 is a schematic configuration diagram of a recording apparatus according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a drum included in the recording apparatus.

FIG. 6 is a perspective view of a drum included in the recording apparatus.

FIG. 7 is a perspective view of the drum included in the recording apparatus as viewed from the front side.

FIG. 8 is a cross-sectional view of a clamp member drive mechanism portion included in the same recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 drum 5 clamp member 13 cam member 19 rod 19a shaft portion 30 ring-shaped member 31 bearing

Claims (3)

[Claims] 1. A drum around which a recording medium is wound around an outer peripheral surface, and a drum which is mounted on the drum so as to be rotatable and openable and closable so as to clamp the front end portion of the recording medium on the drum, and A clamp member for releasing the clamped state, a clamp member opening / closing drive cam member that rotates integrally with the drum, and a clamp member provided outside the drum, are opened / closed by engagement / disengagement operation with the cam member. As described above, a rod for displacing a cam member that rotates integrally with the drum is provided, and a shaft portion is formed at a tip end portion of the rod, and the shaft portion serves as an engaging portion with the cam member. A recording apparatus, wherein a ring-shaped member is rotatably provided. 2. The recording apparatus according to claim 1, wherein the ring-shaped member is attached to the shaft portion via a bearing. 3. The recording apparatus according to claim 1, wherein the ring-shaped member is detachable from the shaft portion.