JPH0252773A - Printer - Google Patents

Abstract

PURPOSE:To engage a driving gear on the printer body side and a driving receiving gear on the paper feeder accurately and easily with each other, and to obtain a printer precisely transmitting driving force by movably installing the gear shaft of the driving receiving gear on the paper feeder side so that the driving receiving gear is brought into contact with and separated from the driving gear on the printer body side. CONSTITUTION:When a paper feeder 3 is placed onto a printer body 2, the side cover 12 of the paper feeder 3 is put onto the printer body cover 6 of the printer body 2 and positioned under the state in which a front cover 24 is opened and driving receiving gears 27, 28 are pulled up upward. The engaging protrusion 13 of the frame side plate 11 of the paper feeder 3 is interlinked with the engaging hole 9 of the printer body cover 6, thus locating the paper feeder 3 in the horizontal direction to the printer body 2. A cam 23 is pushed down downward, the upper ends of support plates 31, 32 are pushed open, and the cam 23 is pushed up upward by the front cover 2. Accordingly, the driving receiving gears 27, 28 are moved downward, and the driving receiving gears 27, 28 are engaged with a printer body driving gear 4b.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a printer, and more specifically, a drive receiver serving as a rotational power source on a paper feeder side transmits the rotation of a drive gear on the printer body side to a gear. It relates to a rotation transmission mechanism.

[Conventional technology]

2. Description of the Related Art Printers are known as output devices for computer systems, office automation systems, etc., and are known, for example, as shown in Japanese Utility Model Application No. 62-163331 (shown in FIG. 12).

In the figure, 101 is a printer, and the printer main body 102
and a paper feeder 103, and has a structure in which the paper feeder 103 can be placed and positioned on the printer main body 102 and can be removed. This will be explained in detail below.

104 is a platen of the printer main body 102, and its shaft 10
Both ends of the shaft 4a are rotatably attached to a frame 105 of the printer main body 102, and side plates 106a and 106b of the frame main body 106 of the paper feeder 103 are attached to this shaft 104a.
are removably engaged with each other, and are connected to a small DC motor 10B via a gear train 107.

On the other hand, in the paper feeder 103, a paper feed shaft 10 is provided between the left and right side plates 106a and 106b that constitute the frame body 106.
9 is rotatably suspended horizontally, and a rubber paper feed roller 110 is attached to the paper feed shaft 109.

111 is a paper ejection roller, and this roller 111 is attached to the left and right side plates 1.
A roller shaft 11 rotatably installed horizontally between 06a and 106b
It is attached to 2.

Therefore, the rotation on the printer main body 102 side is around the axis 1.04.
from the drive gear 113 attached to the paper feeder 103
The example drive receiver is gear 114. The rotation is transmitted to the rotation transmission shaft 116 via the gear 115. The rotation of the rotation transmission shaft 116 drives the paper feed shaft 109 and the roller shaft 112. That is, the drive gear 113 and the drive receiver are gear 1.
14, the rotation of the printer main body 102 is transmitted to the paper feeder 103 side.

Side plates 106a and 106b of the frame body 106 of the paper feeder 103 are removably engaged with the platen shaft 104a. This allows the paper feeder 103 to be connected to the printer 10.
2, the paper feeder 103 is accurately positioned with respect to the printer main body 102, and the drive gear 113
The gear 114 is engaged with the drive receiver.

In such a printer, the left and right side plates 106a, 106b are directly supported by the platen shaft 104a, and the driving gear 1 is
13 and the drive receiver have a structure in which the gear 114 meshes with each other. Therefore, the meshing of the drive gear 113 and the drive receiver with the gear 114 based on the left and right side plates 106a and 106b is accurate and easy.

However, since the platen shaft 104a directly supports the weight of the paper feeder 103 via the left and right side plates 106a and 106b, it is necessary to increase the strength of the platen shaft 104a and the frame 105. Depending on the weight of the printer 103, the operating accuracy of the printer 101 may decrease, or the printer main body 102 and paper feeder 103 may resonate, which may impair the outline of the print.

[Problem to be solved by the invention]

Therefore, the drive gear 113 and the drive receiver do not mesh with the gear 114 based on the side plates 106a and 106b, and the side cover 117 forms the edge of the upper opening of the printer main body 102, as shown in FIG. If the structure is such that it is placed on the printer body cover 118, the platen shaft 104a
The QIJ of the paper feeder 103 is not directly supported (this eliminates the above-mentioned problem. In this case, the drive gear 113 and drive receiver shown in FIG. However, there is a problem in that the meshing accuracy of these gears becomes inaccurate, and therefore, the transmission of rotation between the gears is uncertain, and gear wear also occurs.

The reason for this will be explained. In FIGS. 12 and 13, the reference plane when placing the paper feeder 103 on the printer body 102 is the printer body cover 118 of the printer body 102.
and a side cover 117 of the paper feeder 103,
The accuracy of the drive gear 113 with respect to the printer main body cover 118 and the drive bone with respect to the slide cover 117 are
Although it is necessary to ensure the accuracy of printer body cover 118. The side cover 117 is originally manufactured as a cover to prevent rings, etc., and there are variations in molded dimensions. Therefore, it is difficult to ensure the meshing accuracy of the drive gear 113 and the drive bone with the gear 114.

The present invention has been made to solve the above-mentioned problem, and its purpose is to control the rotation of the drive gear on the printer body side while the side cover of the paper feeder is placed on the printer body cover of the printer body. In printers where the drive bone on the paper feeder side is transmitted to gears, the drive gear on the printer main body side and the drive bone on the paper feeder side mesh with the gears accurately and easily, resulting in accurate transmission of driving force. The goal is to provide the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a printer main body and a paper feeder that can be placed on and removed from the printer main body, and the rotation of the drive gear on the printer main body side In a printer in which the drive bone as a rotational power source on the paper feeder side is transmitted to a gear, the drive bone on the paper feeder side transmits the rotation power source to the gear shaft of the gear,
The driving frame is movably provided in the paper feeder so that the gear comes into contact with and separates from the driving gear on the printer main body side.

It consists of a printer main body and a paper feeder that can be placed on and removed from the printer main body. In this printer, the drive bone supports the support shaft of the second gear of the gear train that meshes with the gear on the side plate of the frame of the paper feeder, and the drive bone supports the support shaft of the second gear of the gear train that meshes with the gear, and the drive bone is arranged so that the gear comes into contact with and separates from the drive gear on the printer main body side. The drive bone can also be configured to swing the gear shaft of the gear with respect to the support shaft of the second gear of the gear train.

Also, it consists of a printer main body and a paper feeder that can be placed on and removed from the printer main body, and a drive bone serving as a rotational power source on the paper feeder side transmits the rotation of the drive gear on the printer main body to the gear. In this printer, a pair of drive bones are attached to the frame side plate of the paper feeder, and support the support shaft of the second gear of the gear train that meshes with the gear, and connect the shaft center of the drive gear and the shaft center of the second gear of the gear train. The pair of drive bones have the gears facing each other and arranged with respect to the connecting line, and the drive bones drive the gears relative to the support shaft of the second gear in the gear train so that the gears come into contact with and separate from the drive gear on the printer main body side. The bone can also form the gear shaft of the gear so that it can swing freely.

[For production]

In the present invention, when the paper feeder is mounted on the printer main body, the drive shaft of the paper feeder moves downward from the position when the paper feeder is removed from the printer main body.
The gear on the drive bone meshes with the drive gear on the printer body.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 show the contents of a printer according to a first embodiment of the present invention.First, the overall structure such as positioning of the printer will be explained with reference to FIGS. 3 to 5, and then FIG. , the main part of the present invention will be explained with reference to FIG.

In FIGS. 3 to 5, reference numeral 1 denotes a printer according to this embodiment, which includes a printer body 2 and a
It is composed of a removable paper feeder 3.

The printer main body 2 includes internal mechanisms such as a platen 4, and both ends of the platen shaft 4a of the platen 4 are connected to a frame 5.
5 is rotatably attached to the shaft.

A drive gear 4b- is provided on the platen shaft 4a,
The outside of the frame 5.5 is protected by a printer body cover 6, and an upper opening 7 is formed at the top.

The peripheral edge part 8 of the printer main body cover 6 is formed into a structure having a portal shape in cross section, and includes flanges formed on the inner surfaces on both left and right sides of the peripheral edge part 8 forming the edge of the upper opening 7 of the printer main body 2. Engagement holes 9.9 are formed in each of 8A, and a flange 8B is formed on the right inner surface of the peripheral edge 8.

On the other hand, in the paper feeder 3, side covers 12 are provided on the outside of both frame side plates 11.11 that support the roller shaft 10a of the paper feed roller 10, etc., respectively. Engaging protrusions 13 are provided at the lower ends of both side plates 11°11, respectively. In addition, the right side plate 11
A hook 14 is attached to the.

Next, the main parts of the present invention will be explained with reference to FIGS. 1 and 2. In the figure, there is an L on the frame side plate 11 of the paper feeder 3.
A letter-shaped cam lever 21 is pivotally supported around a cam shaft 22, and a triangular cam 23 with a pointed tip is loosely fitted into one end of the cam lever 21.

One end of a coil spring 25 is connected to the camshaft 22, and the other end of the coil spring 25 is connected to a protrusion 2 provided on the frame side plate 11.
6, and a downward pulling force is applied to the camshaft 22. By pushing the other end of the cam lever 21 with a cam lever pushing piece 24A provided at the tip of the front cover 24, the cam lever 21 is rotated against the coil spring 25.

A pair of drive receivers 27 and 28 are gears that mesh with the drive gear 4b of the printer main body 2, and a drive receiver 29 is a second gear of the gear train that meshes with the gears 27 and 28, both of which are disposed on the paper feeder 3 side. . The pair of drive bearing gears 27 and 28 are opposed to each other with respect to a vertical line passing through the axis of the drive gear 4b of the printer main body 2.

A support shaft 30 supporting the second gear 29 of the gear train is provided on the frame side plate 11, and a pair of support plates 31 and 32 are rotatably supported on this support shaft 30. .32 intersect to form an X-shaped chisel. Gear shafts 27A, 28A provided at the lower end of each support plate 31.32 support gears 27, 28 in the drive receiver. 31. It is designed to swing through 32.

Further, a torsion spring 33 is mounted on the support shaft 30 that supports the second gear 29 of the gear train, and the gear shafts 27A, 28
A is pressed downward (in a direction in which they approach each other). The pressing force of this torsion spring 33 is smaller than the tensile force of the coil spring 25 that pulls down the cam 23.

In the figure, 34 is a third gear in the gear train that meshes with the second gear 29 in the gear train.

Next, the operation of this embodiment will be explained.

When placing the paper feeder 3 on the printer main body 2, open the front cover 24, pull up the gears 27 and 28 of the drive receiver, and place the side cover 12 of the paper feeder 3 on the printer main body 2. Place it on the cover 6 and position it.

That is, as shown in FIGS. 3 to 5, the paper feeder 3
Pass this through the side cover 12 to the printer body cover 6.
It is supported by the printer main body cover 6 by being placed on the peripheral edge 8 of the printer body. Further, by engaging the engagement protrusion 13 of the frame side plate 11 of the paper feeder 3 with the engagement hole 9 of the printer main body cover 6, the paper feeder 3 is positioned in the horizontal direction with respect to the printer main body 2. .

The state of the gear at this time is shown in FIGS. 6 and 8.

In this state, the front cover 24 is raised and the cam lever 21 is not pressed by the front cover 24. Here, the pressing force by the torsion spring 33 is
Since the tensile force of the coil spring 25 pulling down the cam 23 is smaller than the tensile force of the coil spring 25 pulling down the cam 23, the cam 23 is pushed down by the coil spring 25, and this force pushes open the upper end of the support plate 31, 32, so that the drive receiver .28 are rotated away from each other around the support shaft 30, and are lifted upward.

As shown in FIG. 1, when the front cover 24 is lowered, the cam lever 21 is pressed by the front cover 24, thereby pushing the cam 23 upward against the coil spring 25.

As a result, the upper end side of the support plate 31.32 becomes freely movable, and due to the force of the torsion spring 33, the drive receiver supported at the lower end of the support plate 31.32, which is pivotally supported on the support shaft 30, is moved to the gear 27. On the 2nd day, they move downward (closer to each other). Therefore, the drive receiver is gear 27.
28 meshes with the drive gear 4b of the printer body 2.

Next, the effects of this embodiment will be explained.

First, when the paper feeder 3 is placed and positioned on the printer main body 2, the position of the support shaft 30 on the paper feeder 3 side is not secured relative to the position of the shaft of the drive gear 4b on the printer main body 2 side (for example, , in FIG. 7, there is a relative dimensional error of 21 m in the vertical direction 2 front-rear direction), therefore, the relative dimensions of the drive receiving gears 27 and 28 with respect to the drive gear 4b may not be secured.

Even in this case, the gear shafts of the drive receiving gears 27 and 28 of the paper feeder 3 are movably provided in the paper feeder 3 so that the drive receiving gears 27 and 28 come into contact with and separate from the drive gear 4b of the printer body 2. Therefore, the drive receiving gears 27 and 28 of the paper feeder 3 are moved by an appropriate amount from their normal positions and mesh with the drive gear 4b of the printer main body 2 in a state that follows them.

Therefore, the drive gear 4b on the printer main body 2 side and the paper feeder 3
The meshing operation with the drive receiving gears 27 and 28 of the example becomes easy, and wear and tear on both gears can be prevented.

Furthermore, the paper feeder 3 can be placed on the printer main body cover 6 without any gaps, and it is also possible to prevent dust from entering the upper opening 7 or sound leaking from the upper opening 7 to the outside.

Second, as described above, when the paper feeder 3 is placed and positioned on the printer body 2, the drive gear 4b on the printer body 2 side
If the position of the drive receiving gears 27 and 28 of the paper feeder 3 is not secured with respect to the position of the paper feeder 3, the frame side plate 11 of the paper feeder 3
The gear shafts 27A, 28 of the drive receiving gears 27 and 28 are centered around the support shaft 30 of the second gear of the gear train fixed to the
As B swings, the drive receiving gears 27 and 28 are
It moves an appropriate amount from its normal position substantially along the normal direction to the drive gear 4b, and meshes with the drive gear 4b of the printer main body 2.

Therefore, the drive gear 4b on the printer main body 2 side and the paper feeder 3
The meshing operation with the drive receiving gears 27 and 28 on the side becomes easy, and wear and tear on both gears can be prevented.

Thirdly, since the pair of drive receiving gears 27 and 28 are arranged opposite to each other with respect to the vertical line passing through the axis of the drive gear 4b of the printer main body 2, the pair of drive gears 27 and 28 are arranged facing each other with respect to the vertical line passing through the axis of the drive gear 4b of the printer main body 2. One of the drive receiving gears 27 and 28 receives a force in the direction in which it meshes with the drive gear 4b, so that meshing of the gears can always be ensured, and the rotation direction of the drive gear 4b of the printer main body 2.

The speed can be accurately transmitted to the drive gears 27, 28 of the paper feeder 3.

In this embodiment, a pair of drive receiving gears 27.
28 are arranged opposite to each other with respect to a vertical line passing through the axis of the drive gear 4b of the printer main body 2. As shown in FIG. 9, the drive receiving gears 52. 53 and the gear train second gear 54 can also be arranged laterally. That is, the second gear train meshing with the pair of drive receiving gears 52 and 53 is attached to the side plate of the frame of the paper feeder.
The support shaft 55 of the gear 54 is supported, and the pair of drive receiving gears 52 and 53 are arranged to face each other with respect to a horizontal line connecting the axis of the drive gear 51 and the axis of the second gear 54 of the gear train. There is.

Even in such a modified example, when the drive gear 51 suddenly reverses forward or backward, one of the pair of drive receiving gears 52, 53 receives a force in the direction of meshing with the drive gear 51, so that the meshing of the gears can always be ensured. The same effects as in the embodiment are achieved.

FIG. 1O shows the main parts of a printer according to a second embodiment of the present invention.

In the second embodiment, one driven gear 27 is used as the driven gear.
The other configurations are the same as those of the first embodiment.

In this embodiment, when the drive gear 4b rotates in six directions, the support shaft 30 that supports the second gear 29 of the gear train
The support plate 31 supported by the support plate 31 receives a force in the direction a, and the rotation is reliably transmitted to the drive receiving gear 27. However, sometimes when the rotation of the driving gear 4b changes from the direction A to the direction B, the rotation of the drive receiving gear 4b changes from the direction A to the direction B. 27 may be pushed up in the direction b, causing the drive receiving gear 27 to float. In this case, in order to prevent this floating, the spring pressure of the torsion spring 33 may be increased.

The second embodiment also provides the same effects as the first embodiment.

FIG. 11 shows the main parts of a printer according to a third embodiment of the present invention.

As shown in the figure, the drive gear 41 on the printer main body side is engaged with the gear 42A of the toothed pulley 42 on the paper feeder side, and the drive bone is the Boo+J4 of the toothed pulley 42.
2B and a pulley 44B of a toothed pulley 44 provided on the roller shaft 43 is a belt 45.

In this case, the slack in the belt 45 due to displacement of the meshing position of the gear 42A of the toothed pulley 42 between the drive gear 41 and the drive bone is absorbed by adjusting the position of the tension pulley 46.

According to the third embodiment, the same effects as the first embodiment are achieved.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

In the printer according to claim 1, when the paper feeder is placed and positioned on the printer main body, the drive bone on the paper feeder side does not ensure the position of the gear relative to the position of the drive gear on the printer main body. There is. In other words, even if the relative dimensions of the gear are not ensured, the drive bone of the paper feeder should be aligned with the gear shaft of the gear, and the drive bone should be aligned with the drive gear of the paper feeder so that the gear comes into contact with and separates from the drive gear of the printer body. Since it is movable,
The driving gear of the paper feeder meshes with the driving gear of the printer main body in a state where the gear is moved an appropriate amount from its normal position and follows the driving gear of the printer main body.

Therefore, the drive gear on the printer main body side and the drive bone on the paper feeder side can easily mesh with the gears, and wear and tear on both gears can be prevented.

Furthermore, the paper feeder can be placed on the printer main body cover without any gaps, and it is possible to prevent dust from entering the upper opening or sound leaking from the upper opening to the outside.

According to the printer according to claim 2, when the paper feeder is mounted and positioned on the plink main body, the position of the drive bone on the paper feeder side is not secured relative to the position of the drive gear on the printer main body side. The drive bone of the paper feeder swings around the support shaft of the second gear, which is fixed to the frame side plate of the paper feeder. It moves an appropriate amount from its normal position approximately along the normal direction to the gear and meshes with the drive gear of the printer body. Therefore, the drive gear on the printer main body side and the drive bone on the paper feeder side can easily mesh with the gears, and wear and tear on both gears can be prevented.

According to the printer according to claim 3, since the pair of drive bones are disposed opposite to the line connecting the axis of the drive gear of the printer main body and the axis of the second gear of the gear train, When the gears rapidly rotate in the forward or reverse direction, the pair of drive bones receives a force in the direction in which one of the gears meshes with the drive gear, ensuring that the gears always mesh, and in the direction of rotation of the drive gear of the printer body.

The speed can be accurately transmitted to the gears by the drive bone of the paper feeder.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of a printer according to a first embodiment of the present invention. FIG. 2 is a sectional front view of the main parts of the printer. FIG. 3 is a partially sectional front view showing the overall structure of the printer. FIG. 4 is a partially sectional side view showing the overall structure of the printer. FIG. 5 is a sectional view taken along line XX in FIG. 4, showing the positioning relationship between the printer body and the paper feeder. FIG. 6 is an explanatory diagram of the operation of the printer. FIG. 7 is an operational explanatory diagram showing the meshing state of the driving gear and driven gear in the same printer. FIG. 8 is an explanatory diagram of the operation of the same printer, showing a state in which the driving gear and the driven gear do not mesh with each other. FIG. 9 is an explanatory diagram of the arrangement of gears showing a modification of this embodiment. FIG. 10 is a side view of essential parts of a printer according to a second embodiment of the present invention. FIG. 11 is a side view of essential parts of a printer according to a third embodiment of the present invention. FIG. 12 is a sectional view of a conventional printer. FIG. 13 is a partially sectional front view of a conventional printer. [Explanation of symbols of main parts] 1...Printer according to this embodiment 2...Printer main body 3...Paper feeder 4b...Drive gear 27, 28...Drive receiver is gear 27A, 28A...Gear shaft. Figure Figure Figure Figure Figure Garden

Claims (3)

[Claims] (1) Consists of a printer main body and a paper feeder that can be placed on and removed from the printer main body, and the rotation of the drive gear on the printer main body side is transmitted to the drive receiving gear as a rotational power source on the paper feeder side. 1. A printer characterized in that a gear shaft of a drive gear on the paper feeder side is movably provided on the paper feeder so that the drive gear comes into contact with and separates from the drive gear on the printer main body side. (2) Consists of a printer main body and a paper feeder that can be placed on and removed from the printer main body, and the rotation of the drive gear on the printer main body is transmitted to the drive receiving gear as a rotational power source on the paper feeder side. In this printer, the support shaft of the second gear of the gear train that meshes with the drive receiving gear is supported on the side plate of the frame of the paper feeder, and the gear train is supported so that the drive receiving gear comes into contact with and separates from the driving gear on the printer main body side. A printer characterized in that a gear shaft of a drive receiving gear is configured to be swingable with respect to a support shaft of a second gear. (3) Consisting of a printer body and a paper feeder that can be placed on and removed from the printer body, the rotation of the drive gear on the printer body side is transmitted to the drive receiving gear serving as a rotational power source on the paper feeder side. In this printer, the support shaft of the second gear in the gear train that meshes with the pair of drive receiving gears is supported on the frame side plate of the paper feeder, and the shaft center of the drive gear and the shaft center of the second gear in the gear train are connected. The pair of drive receiving gears are arranged to face each other with respect to the line, and the driving receiving gear is arranged relative to the support shaft of the second gear of the gear train so that the driving receiving gear comes into contact with and separates from the driving gear on the printer main body side. A printer characterized by a gear shaft configured to be swingable.