JPH0594111U - Printer release device - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of the entire device by reducing the occupied space, and to significantly reduce the cost of parts. [Structure] A cam portion 4 attached to a rotatable cam shaft portion 3, and a released portion 2 which is engaged with the cam portion 4 and which is in a rotational position of the cam portion 4, releases the released portion Pr or a non-release position (set position). Ps) displaceable engagement mechanism section 5,
A transmission mechanism section 6 is provided which interposes the clutch section 7 and transmits the motion of the other drive system 8 to the camshaft section 3 to rotate the camshaft section 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printer release device for releasing a released portion such as a transfer charger by a predetermined distance after a recording operation is completed.

[0002]

[Prior art and problems]

 2. Description of the Related Art Conventionally, a printer that performs recording by an electrophotographic method is known, and generally, this type of printer is equipped with a transfer charger for transferring the toner adhering to the photosensitive drum onto a continuous recording paper.

In the label printer disclosed in Japanese Patent Application Laid-Open No. 2-163776, a transfer charger (released portion) is supported by a release device, and at the time of recording operation, the transfer charger is displaced to a set position approaching the photosensitive drum and recording is performed. At the end of the operation, it was displaced to the release position away from the photosensitive drum. That is, the release device disclosed in the publication includes a movable arm whose one end is rotatably attached, supports the transfer charger on the other end (tip end) side of the movable arm, and controls the intermediate position of the movable arm and the drive motor. The eccentric position of the drive gear that is rotated by the rotary mechanism is rotatably connected by a link, and the movable arm can be displaced within a certain angle range by the drive mechanism.

Note that the reason for providing such a release device is that in the case of a label printer, since recording is performed on continuous recording paper in which a large number of label sheets are attached at regular intervals, an unrecorded label in front of the fixing device is used. This is for rewinding by a certain length so that recording can be restarted from the unrecorded label when the recording operation is restarted.

However, since the above-mentioned conventional release device uses an independent drive mechanism including a drive motor dedicated for displacing the transfer charger (released part), the space occupied by these causes an increase in the size of the entire device. At the same time, there was a problem that the cost of parts increased significantly.

The present invention solves the problems existing in the prior art as described above. The release device of the printer can reduce the size of the entire device by reducing the occupied space and can significantly reduce the parts cost. For the purpose of providing.

[0007]

[Means for Solving the Problems]

 In the present invention, when the release device 1 of the printer for releasing the released portion 2 by a predetermined distance after the recording operation is configured, the cam portion 4 attached to the rotatable cam shaft portion 3 and the cam portion 4 are The engaging mechanism portion 5 which is engaged and is capable of displacing the released portion 2 to the release position Pr or the non-release position (set position Ps) by the rotational position of the cam portion 4 and the clutch portion 7 are interposed, and It is characterized by comprising a transmission mechanism section 6 capable of transmitting the motion in another drive system 8 to the camshaft section 3 and rotating the camshaft section 3.

In this case, the released portion 2 is preferably applied to the transfer charger 2 p in the electrophotographic printer. Further, as the other drive system 8, a main drive mechanism 8m for driving the traveling system can be used, and the clutch unit 7 can be an electromagnetic clutch 7c having an input gear 7i and an output gear 7o.

[0009]

[Action]

 According to the printer release device 1 of the present invention, by switching the electromagnetic clutch 7c constituting the clutch unit 7 to the connection mode, the movement of the main drive mechanism 8m, which is another drive system 8, causes the electromagnetic clutch 7c to move. It is transmitted to the camshaft portion 3 via the transmission mechanism portion 6 including the above. As a result, the camshaft portion 3 and the cam portion 4 rotate, and at the same time, the engagement mechanism portion 5 that engages with the cam portion 4 shifts in accordance with the rotational position of the cam portion 4. On the other hand, when the electromagnetic clutch 7c is switched to the disengagement mode, the movement of the main drive mechanism 8m is not transmitted to the camshaft portion 3, so that the displacement of the engagement mechanism portion 5 is stopped.

Therefore, the electromagnetic clutch 7c is switched to the connection mode to displace the engagement mechanism portion 5, and the released portion 2, that is, the transfer charger 2p approaches the photosensitive drum during the recording operation. Ps) or the release position Pr which is separated from the photosensitive drum by a certain distance at the end of the recording operation, the electromagnetic clutch 7c is switched to the disengagement mode. The charger 2p is selectively displaced to the set position Ps or the release position Pr.

[0011]

【Example】

 Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, in order to clarify the present invention, an overall schematic configuration of a label printer using an electrophotographic method will be described with reference to FIG.

The label printer P shown in the figure includes a machine body 50, and a photosensitive drum D is arranged in the middle of the machine body 50. On the other hand, the continuous recording paper L fed from a supply reel (not shown) is a traveling path formed by a paper guide 51, a plurality of roller mechanisms 52 including a pair of driving rollers and driven rollers, a plurality of guide plates 53, and the like. It is wound on a take-up reel (not shown) through F. Then, the continuous recording paper L contacts the outer peripheral surface of the photosensitive drum D.

On the other hand, facing the periphery of the photosensitive drum D, a cleaner (toner collector) 54, an eraser 55 for erasing the electric charge of the photosensitive drum D, a main charger 56 for giving an electric charge to the photosensitive drum D, a recording LED head 57 that forms an electrostatic latent image by writing (exposure) image information to photosensitive drum D, developer 58 that forms a visible image by attaching toner to the electrostatic latent image of photosensitive drum D, toner A transfer charger 2p (released portion 2) for transferring the sheet onto the continuous recording paper L is sequentially arranged.

The transfer charger 2p is supported by the release device 1 according to the present invention, is displaced to the set position Ps or the release position Pr with respect to the photosensitive drum D 1, and the continuous recording paper L is transferred to the photosensitive drum D 1 accordingly. To or away from. Further, a fixing device 61 for fixing the toner attached to the continuous recording paper L by a pair of heat rollers 62a and 62b is arranged on the traveling path F. The one heat roller 62a is supported by the displacement mechanism 63, and the heat roller 62a is displaced with respect to the heat roller 62b to a pressing position or a pressing releasing position (release position).

Next, the configuration of the release device 1 according to the present invention will be concretely described with reference to FIGS.

First, the release device 1 includes the engagement mechanism portion 5 shown in FIG. The engaging mechanism portion 5 has a movable plate 12 whose one end is rotatably supported by a support shaft portion 11, and is the other side of this movable plate 12 (the side to which the continuous recording paper L is supplied), and the photosensitive drum. A pair of engaging pieces 13s and 13r facing each other at a predetermined distance are bent at a right angle on the approaching side and the separating side with respect to D. The movable plate 12 of the embodiment is composed of a combination of a plurality of plate materials. Further, a transfer charger 2p facing the photosensitive drum D is attached at an intermediate position of the movable plate 12. Furthermore, a guide roller 14 that guides the continuous recording paper L is provided next to the transfer charger 2p, and a rewinding guide roller 15 is provided at the opposite side of the continuous recording paper L. .. In addition, a position restriction portion (not shown) that allows displacement of the movable plate 12 is provided only in a range between the set position Ps and the release position Pr.

On the other hand, a U-shaped cutout portion 16 is provided in the movable plate 12 between the engagement pieces 13s and 13r, and a camshaft that is perpendicular to the displacement direction of the movable plate 12 is provided inside the cutout portion 16. The cam portion 4 is attached to one end of the cam shaft portion 3 while the portion 3 is provided. For the cam portion 4, an eccentric cam 4e (see Japanese Patent Application Laid-Open No. 3-94286) can be used. The eccentric cam 4e has a pusher 18 elastically supported by a spring 17 on the peripheral surface farthest from the camshaft portion 3, and each time the eccentric cam 4e rotates 180 °, the pusher 18 engages each engaging piece. It is configured to selectively press 13s or 13r.

On the other hand, the transmission mechanism portion 6 shown in FIG. 1 is connected to the other end of the camshaft portion 3. The transmission mechanism portion 6 selectively transmits the motion of the other drive system 8, that is, the main drive mechanism 8m that drives the traveling system, to the camshaft portion 3 so that the camshaft portion 3 is rotatable.

In this case, the main drive mechanism 8m is provided with the feed motor 21, and at various locations, a transmitted portion, that is, a transmitted gear 22 for transmitting rotation to the photosensitive drum D, a heat roller of the fixing device 61, and the like. A transmission gear 23 for transmitting rotation, a transmission gear 24 for transmitting rotation to a plurality of roller mechanisms 52, etc. are provided, and guide rollers 25, 26, 27 are provided. Then, a timing belt 29 is bridged over the motor gear 28 attached to the rotary shaft of the feed motor 21, the gears 22-24, and the guide rollers 25-27.

Further, in the transmission mechanism section 6, reference numeral 7 is a clutch section, which uses an electromagnetic clutch 7c having an input gear 7i and an output gear 7o, and the input gear 7i meshes with a transmitted gear 24. On the other hand, a drive gear 30 is attached to the other end of the camshaft portion 3, and the drive gear 30 meshes with the output gear 7o. The electromagnetic clutch 7c is selectively switched between the connection mode and the disengagement mode in response to an input signal. In the connection mode, the rotation of the input gear 7i is transmitted to the output gear 7o. 7i idles, and the rotation is not transmitted to the output gear 7o.

On the other hand, a shutter plate 32 shown in FIG. 3 is attached to an intermediate position of the cam shaft portion 3, and a photo switch 33 having a light emitting portion and a light receiving portion is arranged in the movement path of the shutter plate 32, so that the cam plate The position detector 31 is configured. As a result, the optical path of the photo switch 33 is released (ON) or blocked (OFF) depending on the rotational position of the shutter plate 32. In this case, the shutter plate 32 blocks and blocks the optical path of the photo switch 33 at a position where the eccentric cam 4e presses one engagement piece 13s, that is, the transfer charger 2p is displaced to the set position Ps. The range is set to a range in which the camshaft portion 3 rotates 45 ° back and forth from this cutoff position.

Next, the function of the release device 1 according to the present invention will be described.

First, in the recording operation, the eccentric cam 4e is at the position shown by the solid line (cross section) in FIG. 2, and the pusher 18 presses the engaging piece 13s of the movable plate 12. As a result, the transfer charger 2p is displaced to the set position Ps approaching the photosensitive drum D. The continuous recording paper L contacts the photosensitive drum D and is guided by the guide roller 14. In addition, as shown in FIG. 3, the optical path of the photo switch 33 in the cam position detector 31 is blocked by the shutter plate 32 and turned off, and the electromagnetic clutch 7c is in the disengagement mode.

On the other hand, when the recording operation is completed, the electromagnetic clutch 7c is switched to the connection mode by the recording end signal. As a result, the movement of the main drive mechanism 8m, that is, the rotation of the transmitted gear 24 rotated by the movement of the timing belt 29 is transmitted to the drive gear 30 via the electromagnetic clutch 7c, and the camshaft portion 3 and the eccentric cam 4e. Rotates. When the camshaft portion 3 rotates by 45 °, the photoswitch 33 is switched from OFF to ON by the movement of the shutter plate 32, and therefore, the electromagnetic clutch 7c is switched to the disengagement mode after a certain time elapses from this point. This stops the rotation of the deflection cam 4e. The fixed time in this case is set in advance so that the deflection cam 4e is at a position rotated by about 180 °. The main drive mechanism 8m is stopped after such a series of operations is completed.

Therefore, since the eccentric cam 4e rotates to the position shown by the phantom line in FIG. 2, the pusher 18 presses the other engaging piece 13r of the movable plate 12. As a result, the transfer charger 2p is displaced to the release position Pr which is separated from the photosensitive drum D. Further, the continuous recording paper L is separated from the photosensitive drum D and is guided by the guide roller 15 at the time of rewinding. On the other hand, since the shutter plate 32 moves to a position rotated 180 ° from the photo switch 33, the photo switch 33 is turned off.

Then, in this state, the continuous recording paper L is rewound by a certain length. That is, in the case of the label printer P, since recording is performed on the continuous recording paper L formed by adhering a large number of label papers at regular intervals, the unrecorded label located in front of the fixing device 61 is wound by a predetermined length. When the recording is resumed and the recording operation is restarted, recording can be restarted from the unrecorded label.

Since the photo switch 33 of the cam position detector 31 is turned on or off corresponding to the position of the deflection cam 4e, that is, the set position Ps and the release position Pr, the deflection cam 4e is turned on or off depending on the ON-OFF state. It is determined in which position the is present.

When the recording operation is resumed, the main drive mechanism 8m is activated by turning on the power switch, etc., and the electromagnetic clutch 7c is in the connection mode. As a result, since the deflection cam 4e rotates and the shutter plate 32 enters the photo switch 33, the electromagnetic clutch 7c is placed in the disengagement mode after a certain time has elapsed from the time when the photo switch 33 was switched from OFF to ON. To do. The fixed time in this case is set in advance so that the deflection cam 4e is rotated by about 180 °. Therefore, the state of the recording operation is restored.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments. For example, although the transfer charger is illustrated as the released portion, the present invention can be similarly applied to the heat roller in the fixing device, and any other released portion such as a guide roller (guide pin). Further, although the rotation angle of the cam portion is controlled by the position and time of the shutter plate, it may be controlled by using a rotation angle detector such as a pulse generator. In addition, the detailed configuration and shape of the cam portion, the transmission mechanism portion, and the engagement mechanism portion can be arbitrarily changed without departing from the scope of the present invention.

[0031]

[Effect of the device]

 As described above, the printer release device according to the present invention engages the cam portion mounted on the rotatable cam shaft and the cam portion, and releases the released portion by the rotational position of the cam portion. Alternatively, it includes an engagement mechanism section that is displaceable to a non-release position, and a transmission mechanism section that intervenes a clutch section and that transmits the motion in another drive system to the cam shaft section and that can rotate the cam shaft section. Therefore, it is possible to reduce the size of the entire device by reducing the occupied space, and to significantly reduce the cost of parts.

[Brief description of drawings]

FIG. 1 is a configuration diagram mainly showing a transmission mechanism portion in a release device according to the present invention,

FIG. 2 is a configuration diagram mainly showing a cam portion and an engagement mechanism portion in the release device,

FIG. 3 is a configuration diagram clearly showing a cam position detection unit in the release device,

FIG. 4 is a schematic configuration diagram of a label printer including the release device,

[Explanation of symbols]

 1 Release Device 2 Released Part 2p Transfer Charger 3 Cam Shaft Part 4 Cam Part 5 Engagement Mechanism Part 6 Transmission Mechanism Part 7 Clutch Part 7c Electromagnetic Clutch 7i Input Gear 7o Output Gear 8 Other Drive System 8m Main Drive Mechanism Pr Release Position Ps set position (non-release position)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G03G 15/00 101 8910-2H 108 7369-2H 15/16

Claims (4)

[Scope of utility model registration request] 1. A release device for a printer, which releases a released portion by a predetermined distance after a recording operation, a cam portion mounted on a rotatable cam shaft portion, and a cam portion engaging with the cam portion and rotating the cam portion. It is possible to rotate the camshaft part by interposing a clutch part and an engagement mechanism part that can displace the released part to the release position or the non-release position depending on the position, and transmitting the motion in another drive system to the camshaft part. Release device for a printer, characterized in that the release device is provided with various transmission mechanisms. 2. The released portion is a transfer charger in an electrophotographic printer.
Release device for the described printer. 3. The printer release device according to claim 1, wherein the other drive system is a main drive mechanism for driving the traveling system. 4. The release device for a printer according to claim 1, wherein the clutch unit uses an electromagnetic clutch having an input gear and an output gear.