JPH0252774A - Printer - Google Patents

Abstract

PURPOSE:To position a paper feeder stably at a printer body by placing and locating the paper feeder to the printer body, releasing the separation of a gear and engaging a driving receiving gear with a driving gear. CONSTITUTION:The driving receiving gear 11 of a paper feeder 3 is separated from the driving gear 5 of a printer body 2 by a stopper before the paper feeder 3 is put onto the printer body 2. When the paper feeder 3 is placed and positioned, an operating rod 9 is pushed upward, and the mounting section 15a of a torsion spring 15 is moved upward. When the center point 13a of a support shaft 13 and the mounting sections 15a, 15b of the torsion spring 15 are adjusted so as to be formed in a straight line immediately before the paper feeder 3 is fast stuck to the printer body 2, the mounting section 15b is pushed when the paper feeder 3 is located at the printer body 2, and a support plate 14 is turned in the counterclockwise direction. That is, the state of the holding of the separation of both gears is released, and the driving receiving gear 11 is engaged with the driving gear 5 by a driving-receiving gear engaging mechanism.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printer, and more specifically, the present invention relates to a printer, and more specifically, a rotation mechanism that transmits the rotation of a drive gear on the printer main body side to a drive receiving gear serving as a rotational power source on the paper feeder side. Regarding the 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. 18).

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 and connected to a small DC motor 108 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 of the printer main body 102 is caused by the shaft 104.
The drive bone on the paper feeder 103 side from the drive gear 113 attached to 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 has a drive bone attached to the gear 11.
4, 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 drive bone and the gear 114 mesh with each other.

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 bone have a structure in which the gear 114 meshes with each other, so that the drive gear 113 and the drive bone mesh with the gear 114 based on the left and right side plates 106a and 106b accurately and easily.

However, since the weight of the paper feeder 103 is directly supported by the platen shaft 104a 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, the operating accuracy of the printer 101 may decrease, or resonance may occur between the printer main body 102 and the paper feeder 103, which may impair the outline of the print.

[Problem to be solved by the invention]

Therefore, with reference to the side plates 106a and 106b, the driving gear 113 and the driving frame do not mesh with the gear 114, and the side cover is placed on the printer main body cover that forms the edge of the upper opening of the printer main body 102. This eliminates the need for the platen shaft 104a to directly support the weight of the paper feeder 103, and the above-mentioned problems can be solved. In this case, it is necessary for the drive gear and drive bone to ensure the meshing accuracy of the gears, but when the paper feeder is mounted on the printer body, the drive bone is Regarding the timing of the positioning and engagement operation between the frame body of the machine and the printer body, when the paper feeder is positioned and placed on the printer body in the order of meshing operation → positioning and engagement operation, the relative relationship of the gear parts will change due to the meshing. It will be decided. In this case, the paper feeder is not stably placed on the printer main body at a proper position and becomes floating, and the state of engagement between the frame main body of the paper feeder and the printer main body becomes unstable. Therefore, there is a problem in that the transmission of rotation between the gears is uncertain, causing damage to the gears.

The present invention has been made to solve the above-mentioned problems, and its purpose is to operate the drive gear on the printer body side while the side cover of the paper feeder is placed and positioned on the printer body cover of the printer body. To provide a printer that stably positions the paper feeder on the printer body when the paper feeder is mounted and positioned on the printer body in a printer in which rotation is transmitted to a gear by a drive bone on the paper feeder side. be.

[Means to solve the problem]

In order to achieve the above object, the present invention consists of a printer main body and a paper feeder that is placed and positioned on the printer main body and is removable. In a printer in which a drive bone as a rotational power source on the machine side is transmitted to a gear, the drive bone of the paper feeder separates the gear from the drive gear of the printer and maintains that state, and the drive bone is a gear holding mechanism; After placing the paper feeder on the printer body and positioning it, the drive bone uses a gear release mechanism to release the separation between the two gears, and the drive bone uses the gear release mechanism to release the separation between the two gears. Accordingly, the drive bone and the gear meshing mechanism for meshing the gear with the drive gear are provided in the paper feeder.

[For production]

In the present invention, before the paper feeder is placed on the printer main body, the drive bone of the paper feeder is kept in that state by separating the gear from the drive gear of the printer main body by the gear holding mechanism. be done.

After the paper feeder is placed and positioned on the printer main body, the driving frame is released from the state in which the two gears are held apart by the gear release mechanism.

When the drive bone is released from the state in which the two gears are held apart by the gear release mechanism, the drive bone is caused to mesh with the drive gear by the gear engagement mechanism.

〔Example〕

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

1 to 3 show the contents of a printer according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a printer according to this embodiment, which is composed of a printer main body 2 and a paper feeder 3 that can be placed on and removed from the printer main body 2.

The printer main body 2 includes an internal mechanism such as a platen (not shown), and both ends of a platen shaft 4 of the platen are rotatably attached to a frame (not shown). A drive gear 5 is provided on the platen shaft 4, and the outside of the frame is protected by a printer body cover 6. On the other hand, in the paper feeder 3, the roller shaft (not shown) of the paper feed roller
A side cover 8 is provided on the outside of both frame side plates 7 that support the frame.

An actuating rod guide groove 8 is provided in the frame side plate 7 of the paper feeder 3, and an actuating rod 9 is attached to the actuating rod guide groove 8 so as to be slidable in the vertical direction.A coil spring 10 is attached to the upper end of the actuating rod 9.
is attached, and the other end of the coil spring 10 is attached to the frame side plate 7. The actuating rod 9 is urged downward by the coil spring 10 and protrudes from the bottom surface of the actuating rod guide groove 8.

Reference numeral 11 denotes a gear as a rotational power source that meshes with the drive gear 5 of the printer body 2, and 12 represents a gear of the gear train 2 that meshes with the gear 11, both of which are disposed on the paper feeder 3 side.

A support shaft 13 that supports the gear 12 of the gear train 2 is provided on the frame side plate 7. An L-shaped support plate 14 is rotatably supported on the support shaft 13. The drive bone gear 11 is supported by the gear shaft 11a provided at the lower end.Therefore, the drive bone gear 11 is rotated around the support shaft 13 via the support plate 14.
It meshes with the gear 12 of the gear train 2 and swings.

And, the torsion spring support part 14 of the support play) 14
b and the center of the actuating rod 9 are connected via a torsion spring 15, and the torsion spring 15 is weaker than the coil spring 10. By adjusting the spring pressure of the torsion spring 15, the drive bone can prevent the gear 11 from lifting up when the drive gear 5 is reversed (rotated counterclockwise), and can reliably receive and inherit the driving force even during forward and reverse rotations. Can be done. In addition, in the figure, 1
6 is a gear of the gear train 3 that meshes with the gear 12 of the gear train 2.

Thus, in the printer according to this embodiment, the drive frame of the paper feeder 3 separates the gear 11 from the drive gear 5 of the printer main body 2 and maintains that state. After placing and positioning on the printer main body 2, the drive bone that releases the maintained state of separation between the two gears has a gear release mechanism;
The drive bone is equipped with a gear meshing mechanism that meshes the gear 11 with the drive gear 5 by releasing the state in which the two gears are held apart by a gear release mechanism.

Next, the operation of this embodiment will be explained.

The state before the paper feeder 3 is placed on the printer main body 2 is the third state.
As shown in the figure.

In this case, if there is no coil spring 10, the support shaft 13
The center point 13a of the torsion spring 15 is attached to the part 15.
a and 15b should be in a straight line, but when the torsion spring 15 is installed, the part 15a is pulled downward by the coil spring 10, so the torsion spring 15 rotates counterclockwise, but in order to balance that moment. , a clockwise moment acts on the support plate 14, and therefore the support plate 14 rotates clockwise about the support shaft 13. In other words, the drive bone is controlled by the gear holding mechanism.
The driving gear 11 of the paper feeder 3 is separated from the driving gear 5 of the printer main body 2 by a suitable distance by a stopper (not shown), and this state is maintained.

A state in which the paper feeder 3 is placed and positioned on the printer main body 2 is shown in FIG.

In this case, the actuating rod 9 is pushed upward by the printer main body 2, and the mounting portion 15a of the torsion spring 15 moves upward against the coil spring IO. Just before the paper feeder 3 comes into close contact with the printer body 2 (the operating rod 9 is pushed upward and reaches the highest position), the center point 13a of the support shaft 13 and the mounting parts 15a and 15b of the torsion spring 15 are aligned. If the adjustment is made so that the paper feeder 3 is positioned in the printer main body 2, the attachment part 15a is the one that is attached, and the previous attachment is the part 1.
5a, 15b, and the center point 13a, the mounting section 15b is located below the line connecting the center point 13a and the torsion spring 15.
The component force of the spring pressure (force in the right angle direction of the support plate 14) presses the mounting portion 15b, and the support plate 14 rotates counterclockwise around the support shaft 13. That is, the drive bone is released from the state in which the two gears are kept apart by the gear release mechanism, the drive bone is released from the state in which the two gears are kept separated by the gear release mechanism, and the drive bone is released by the gear meshing mechanism. The gear 11 is meshed with the drive gear 5.

According to the above configuration, when the paper feeder 3 is placed on the printer main body 2 for positioning, the drive bone performs the meshing action between the gear 11 and the drive gear 3 and the positioning of the paper feeder 3 and the printer main body 2. Regarding the timing of the engagement operation, the operation is performed in the order of positioning engagement operation → meshing operation, and as a result, the paper feeder 3
can be stably positioned without floating on the printer main body 2.

Therefore, transmission of rotation between the gears can be ensured, and damage to the gears can be reduced.

Furthermore, since the paper feeder 3 can be placed on the printer main body cover 6 without any gaps, it is possible to prevent dust from entering the upper opening (not shown) or sound leaking from the upper opening to the outside.

4 to 12 show the contents of a printer according to a second embodiment of the present invention, and FIGS. 4 and 5 show the overall structure of the printer, such as positioning, and FIG. 6 shows the overall structure of the printer.

The main part of the present invention will be explained with reference to FIG. 7, the release of the front cover will be explained with reference to FIGS. 8 and 9, and the operation will be explained with reference to FIGS. 1O to 12.

In FIGS. 4 and 5, reference numeral 21 denotes a printer according to this embodiment, which is composed of a printer main body 22 and a paper feeder 23 that can be placed on and removed from the printer main body 22.

The printer main body 22 includes internal mechanisms such as a platen P, and both ends of a platen shaft 24 of the platen are rotatably attached to a frame (not shown). Platen shaft 24
is provided with a drive gear 25, the outside of the frame is protected by a printer body cover 26, and an upper opening 27 is formed at the top.

On the other hand, in the paper feeder 23, both frame side plates 30.30 are arranged to support the roller shaft 29 of the paper feed roller 28, etc., and engagement protrusions 30a are provided at the lower ends of the frame side plates 30.30. A side cover 31 is provided on the outside of each to cover this. Further, a front cover 32 is provided on the front of the paper feeder 23 to protect it and guide the printed paper to the stacker 31b, and the paper printed on the platen P of the printer main body 22 is ejected by the guide rib 31c. Guided by the paper roller 31d,
The paper is further discharged by the paper discharge roller 31d, and the printed paper is stacked on the stacker 31b.

In FIGS. 6 and 7, the frame side plate 3 of the paper feeder 23
0, an L-shaped cam lever 33 is pivotally supported around a cam shaft 34, and a triangular cam 35 with a pointed tip is loosely fitted to one end of the cam lever 33.

One end of a coil spring 36 is connected to the camshaft 34, and the other end of the coil spring 36 is connected to a protrusion 3 provided on the frame side plate 30.
7, and a downward pulling force is applied to the camshaft 34. As shown in FIGS. 8 and 9, the cam lever 33 is rotated against the coil spring 36 by pushing the other end of the cam lever 33 with a cam lever push piece 38A provided at the tip of the front cover 38. It has become.

39.40 is a pair of drive receivers that mesh with the drive gear 25 of the printer main body 22, and 41 is a gear.
This is the second gear of the gear train that meshes with the second gear, both of which are disposed on the paper feeder 23 side. The pair of drive receiver gears 39 and 40 are opposed to each other with respect to a vertical line passing through the axis of the drive gear 25 of the printer main body 22.

A support shaft 42 that supports the second gear 41 of the gear train is provided on the frame side plate 30, and a pair of support plates 43 and 44 are rotatably supported on this support shaft 42. .44 intersect to form an X-shape. Gear shafts 43A and 44A provided at the lower end of each support plate 43.44 support gears 39.40 of the drive receiver. .44 to mesh with the second gear 41 of the gear train and swing.

Further, a torsion spring 45 is hung on the support shaft 42 that supports the second gear 41 of the gear train, and the gear shafts 43A, 44
A is pressed downward (in a direction in which they approach each other). The pressing force of this torsion spring 45 is smaller than the tensile force of the coil spring 36 that pulls down the cam 35.

In the figure, 46 is a third gear in the gear train that meshes with the second gear 41 in the gear train.

Next, the operation of this embodiment will be explained with reference to FIGS. 8 to 12.

Figure 1O shows the paper feeder 23 removed from the printer main body 22, and the front cover 32 is shown as a solid line in Figure 4.
is jumping up. As a result, the drive receiver is gear 39.4
0 is forcibly pulled upward by a coil spring 36.

8 and 11 show a state in which the removed paper feeder 23 is placed on the printer main body 22. FIG. That is, the engaging protrusion 31a (shown in FIG. 4) of the paper feeder 23 is engaged with the retaining hole (not shown) of the printer main body 22, and the paper feeder 23 is attached to the printer main body 2.
Set the position to 2. In this case, the cam 35 is pushed downward by the coil spring 36, and this force pushes open the upper ends of the support plates 43, 44, so that the gears 39, 40 of the drive receiver are mutually centered around the support shaft 42. It rotates away and is lifted upwards. Therefore, gears 39 and 40 of the drive receiver are spaced apart from and do not mesh with the drive gear 25.

9 and 12 show the state in which the front cover 32 is lowered from the state shown in FIG. 11. By lowering the front cover 32, the cam lever pushing piece 38A of the front cover 32 presses the contact surface 33a of the cam lever 33, and the cam 35 is pressed against the coil spring 3.
Push upward against 6. As a result, the upper end of the support plate 43.44 becomes freely movable, and by the force of the torsion spring 45, the drive receiver supported at the lower end of the support plate 43.44, which is pivotally supported on the support shaft 42, is moved to the gear 39. .40 move downward (towards each other).

Therefore, the drive receiver is gear 39, 40 is the printer main body 22.
It meshes with the drive gear 25 of.

Therefore, in the printer according to this embodiment, the drive receiver of the paper feeder is a drive force that forcibly pulls up the gears 39 and 40 upward by the coil spring 36, separates them from the drive gear 25 of the printer main body 22, and maintains that state. After positioning the sacrum by placing the gear holding mechanism and the paper feeder 23 on the printer main body 22,
Push the cam lever push piece 38A of the front cover 32 into the cam lever 3.
3 to press the contact surface 33a of the cam 35 to the coil spring 3.
When the driving receiving gear release mechanism releases the holding state in which the two gears are kept apart by pushing upward against the force 6, the cover of the torsion spring 45 is released. (support play) 43.
The drive receiving gear meshing mechanism moves the driving receiving gears 39 and 40 supported at the lower end of the drive receiving gear 44 downward and meshing the driving receiving gears 39 and 40 with the driving gear 25.

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

13 to 15 show modified examples of the drive receiving gear release mechanism of the printer of the second embodiment.

In the second embodiment, the drive receiving gear release mechanism causes the cam lever pushing piece 38A of the front cover 32 to press the abutment surface 33a of the cam lever 33, and pushes the cam 35 upward against the coil spring 36. Although the structure is such that the holding state of the gears is released, the drive receiving gear release mechanism for the printer is not limited to this example, and the following structure is also available.

In FIGS. 13 and 14, a coil spring 54 is connected to one end of a cam lever 52 rotatably provided on a frame side plate 51 of a paper feeder (not shown) via a cam shaft 53 that moves up and down along a guide window 51a. One end of the coil spring 54 is connected, and the other end of the coil spring 54 is connected to a protrusion 51b provided on the frame side plate 51. A downward pulling force acts on the camshaft 53, and the cam 55 provided on the camshaft 53 is pulled downward. 56 is a hook attached to the frame side plate 51; 57
is an elastic lever attached to the cam lever 52.

As shown in FIG. 15, when the elastic lever 57 is locked to the hook 56, the cam lever 52 rotates clockwise, pushing the cam 55 upward along the guide window 51a overcoming the tensile force of the coil spring 54. As a result, the drive receiving gear 58 is lowered to the printer's drive gear (not shown).
meshes with

16 and 17 are partially sectional side views of a printer according to a third embodiment of the present invention.

In the figure, a cam lever 63 is pivotally supported on a frame side plate 62 of a paper feeder 61 around a cam shaft 64 .

A torsion spring 65 is provided on the camshaft 64 and urges the cam lever 63 to rotate clockwise.

Reference numeral 66 indicates a drive receiving gear that meshes with a drive gear 67 of the printer main body (not shown), and 68 indicates a second gear in the gear train that meshes with the drive receiving gear 66, which is disposed on the paper feeder 61 side.

A support shaft 69 supporting the second gear 68 of the gear train is provided on the frame side plate 62, and a support plate 70 is rotatably supported on the support shaft 69.

The drive receiving gear 66 is supported by a gear shaft 70A provided at the lower end of the support plate 70, and therefore, the drive receiving gear 66 swings about the support shaft 69 via the support plate 70. .

Further, the upper end of the support plate 70 and the cam lever 63 are connected via a support plate torsion bar 71. This support plate torsion bar 71 has a smaller elastic force than the torsion spring 65. In the figure, 72 is a front cover that rotates the cam lever 63.

FIG. 16 shows a state in which the drive receiving gear 66 is separated from the drive gear 67. From this state, when the paper feeder 61 is positioned and set in the printer body and the front cover 72 is closed, the cam lever 63 is forcibly reversed. Rotating clockwise, the support plate torsion bar 71 passes the dead point, rotates the support plate 70 clockwise, and the drive gear 67 and drive receiving gear 66 mesh with each other. This state is shown in FIG.

On the other hand, when the front cover 72 is removed from the state shown in FIG. When the dead point of the spring 65 is exceeded, it rotates counterclockwise and enters the state shown in FIG. 16.

〔Effect of the invention〕

As described above, according to the printer according to the present invention, when the paper feeder is placed on the printer main body and positioned, the sacral bone is connected to the meshing movement of the gear and the drive gear and the interaction between the paper feeder and the printer main body. Regarding the timing of the positioning engagement operation, the operation is performed in the order of positioning engagement operation → meshing operation, and as a result, the paper feeder can be stably positioned without being lifted up from the printer body.

Therefore, transmission of rotation between the gears can be ensured, and damage to the gears can be reduced.

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

[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 partially sectional front view of the printer. FIG. 3 is an explanatory diagram of the printer operation. FIG. 4 is a partially sectional side view of the printer according to the second embodiment of the present invention when it is disassembled. FIG. 5 is a partially sectional side view of the printer according to the same embodiment when assembled. FIG. 6 is a side view of essential parts of the printer according to the same embodiment. FIG. 7 is a sectional front view of the main parts of the printer according to the same embodiment. FIGS. 8 and 9 are explanatory diagrams of the operation of the cam lever of the same printer. FIG. 10 is a side view of the main parts of the same printer when it is disassembled. FIG. 11 is a side view of the main parts of the same printer when the paper feeder is mounted and the front cover is not lowered. FIG. 12 is a side view of the main parts of the same printer when the paper feeder is mounted and the front cover is lowered. FIG. 13 is a sectional view showing a modification of the gear release mechanism of the same printer. FIGS. 14 and 15 are explanatory diagrams of the operation of the sacral gear release mechanism. 16 and 17 are partially sectional side views of a printer according to a third embodiment of the present invention. FIG. 18 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 5...Drive gear 9...Operating rod 11...Sacral bone gear 14... support plate 15... torsion spring. Figure 1 Figure Figure Figure Figure Figure King Figure Figure 13 Figure Figure Figure Figure

Claims (1)

[Claims] (1) Consists of a printer main body and a paper feeder that is placed and positioned on the printer main body and is removable, and uses the rotation of the drive gear on the printer main body as a rotational power source for the paper feeder. In a printer in which the drive gear is transmitted to a receiving gear, there is a drive receiving gear holding mechanism that separates the drive receiving gear of the paper feeder from the printer's drive gear and maintains that state, and a drive receiving gear holding mechanism that positions the paper feeder by placing it on the printer body. After that, the drive receiving gear release mechanism releases the state in which both gears are kept apart, and the drive receiving gear releases the state in which both gears are kept separated, thereby meshing the drive receiving gear with the driving gear. A printer characterized in that a paper feeder is provided with a gear meshing mechanism.