JPH0671954A - Platen mounting structure for printer - Google Patents

Abstract

PURPOSE:To remove a platen easily by grasping grasping sections of bush lever components, engaging bushes with engaging recessed sections and rotating the same to prevent the separation the bushes from the engaging recessed sections. from CONSTITUTION:In the case a platen 7 is removed from a casing, the engagement of engaging sections 103c, 103c of bush lever components 103, 103 of respective shaft support components 101, 101 with openings is released. Then the ends of the bush lever components 103, 103 are rotated in the given direction to rotate the bushes 105, 105 in the same direction and set shaft components 105b, 105b of the bushes in the state of being long in the longitudinal direction. After that, the ends of bush lever components 103, 103 are grasped and the whole constitution is lifted upward. As the shaft components 105b, 105b of the bushes 105, 105 are varied in the state of being long in the longitudinal direction, the shaft components can be released from the engaging recessed sections to separate a platen 7 from the casing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platen mounting structure for a printing device such as a label printer, and more particularly to a device designed so that the platen can be easily attached and detached from the housing side.

[0002]

2. Description of the Related Art A conventional label printer is shown in FIG.
It has a structure as shown in FIG. First, there is a case 1, and a roll holder 3 is attached to the case 1. Roll paper 5 is loaded in the roll holder 3.
A platen 7 is rotatably installed on the housing 1 and on the left side of the roll holder 3 in the figure. A print head 9 is arranged opposite to the platen 7. The platen 7 is rotatably attached to the housing 1.
A pair of paper guides 11 and 11 (only one of which is shown in the figure) is installed between the roll holder 3 and the platen 7. Further, an automatic cutter mechanism 13 is installed on the left side of the platen 7 in the figure.

The paper 5a pulled out from the roll paper 5 is
The paper is fed by the route shown by the solid line in the figure, and predetermined printing is performed at the print head 9 and the platen 7. Then, it is cut by the automatic cutter mechanism 13 and discharged. The auto cutter mechanism 13 is composed of a fixed blade 15 arranged above and a movable blade 17 arranged below the fixed blade 15 so as to face each other. The movable blade 17 is rotationally driven by a driving unit (not shown), and
The sheet 5a is cut by the shearing operation with the fixed blade 15. A paper guide device 19 is provided on the right side of the auto cutter mechanism 13 in the figure.

[0004]

The above-mentioned conventional structure has the following problems. That is, when the printing apparatus is operated for a long time, so-called paper dust adheres to the platen 7, especially when the print head is a thermal type. If printing is performed as it is with the paper dust adhered to the platen 7, the printing quality will deteriorate. Therefore, the work of removing the platen 7 periodically to remove the attached paper dust is performed. However, as shown in FIG. 16, the platen 7 is fixed to the housing 1 side by using a known snap ring 8 (E-ring or the like) after the bush 10 having a flange is fitted and inserted into the solid shaft. It is in a closed state and cannot be easily removed. Therefore, there has been a problem in that complicated attachment / detachment work using tools is inevitable. Also, that much
Since maintenance / inspection work requires a long time, there is a problem that the operating rate of the printing device is reduced.

The present invention has been made on the basis of the above points, and an object of the present invention is to provide a platen mounting structure for a printing apparatus in which the platen can be easily attached and detached.

[0006]

In order to achieve the above object, the platen mounting structure of the printing apparatus according to the present invention has shaft supporting members mounted on both ends of the platen shaft of the platen, respectively.
The shaft support member includes a bush rotatably mounted on the platen shaft and a bush lever member that is integrally or separately mounted on the bush and has a grip portion. Engagement recesses are formed in the side walls, respectively, to grasp the grip portion of the bush lever member, engage the bush with the engagement recess, and rotate the bush to prevent the bush from coming off the engagement recess. With such a relationship, the platen is attached to the housing, and the platen is detached from the housing by the reverse operation.

At this time, it is conceivable that the bush lever member is provided with a spring action and exerts an elastic holding force by being attached to the pair of side walls from the outside. Also, the bush lever member is provided with a locking portion,
It is conceivable that an opening is formed in the pair of side walls and the fitting state is retained by engaging the locking portion with the opening.

[0008]

[Operation] First, when mounting the platen on the housing side,
The grip portions of the bush lever members of the pair of shaft support members are gripped, and the bushes are engaged with the engaging recesses formed in the pair of side walls of the housing. At the same time, the grip portion of the bush lever member is gripped and rotated. As a result, the bush also rotates in the same direction, and has a non-releasable positional relationship with the engaging recess. With this, the platen is attached to the housing. When the platen is removed from the housing, the reverse operation to the above is performed. or,
When the bush lever member is provided with a spring action and is elastically attached to the pair of side walls to exert an elastic holding force, the platen attachment state should be held by the elastic holding force. become. Further, in the case where the bush lever member is provided with the engaging portion and the pair of side walls is formed with the opening portion so that the engaging portion is engaged with the opening portion, the platen of the platen can also be provided. The attached state will be maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. It should be noted that the same parts as those of the related art are designated by the same reference numerals and the description thereof will be omitted. First, in the case of the present embodiment, as shown in FIG. 1, at both ends of the platen 7,
The shaft support members 101 and 101 'are attached in advance, and the shaft support members 101 and 101' are used to be attached to and detached from the housing 1. At that time, a tool for attachment and detachment Is not used at all. The details will be described below.

First, the platen 7 is provided with a platen shaft 7a, and a platen portion 7b made of an elastic member is fixed to the platen shaft 7a. The end portion of the platen shaft 7a is configured as shown in FIG. That is, the reduced diameter portion 7c is formed at the end of the platen shaft 7a, and the end portion of the reduced diameter portion 7c is further reduced in diameter to become the reduced diameter portion 7d. A collar portion 7e is formed at the end of the reduced diameter portion 7d.

Then, the bush lever member 103 as shown in FIGS. 7 and 8 is first passed through the platen shaft 7a. The bush lever member 103 has a circular portion 103a at one end, and a rectangular opening 103b is formed in the circular portion 103a. Further, the other end of the bush lever member 103 is bent, and the locking portion 10
3c is formed. The bush lever member 103 having such a configuration is provided in the opening 103b at the platen shaft 7a.
It is assembled by passing through. The opening 103b has a diameter larger than that of the platen shaft 7a.

Next, as shown in FIGS. 5 and 6, the bush 105 is passed through the platen shaft 7a. This bush 105
Is composed of a flange portion 105a and a shaft portion 105b formed integrally with one of the flange portions 105a and having a cross-sectional shape of a circular shape with both ends cut off.
The shaft portion 105b is attached to the platen shaft 7a with the shaft portion 105b directed inward. Also, bush 1
The through hole 105c of No. 05 is the reduced diameter portion 7c of the platen shaft 7a.
It has a larger diameter than the platen shaft 7a, but has a smaller diameter than the platen shaft 7a. Therefore, in the assembled state, the reduced diameter portion 7
It is configured so that it will not collide with the stepped portion 107 of the plate c and the platen shaft 7a and move further inward. Further, the shaft portion 105b of the bush 105 and the opening portion 103b of the bush lever member 103, which is already assembled, are fitted to each other. Therefore, the bush lever member 103 and the bush 105 may be assembled in advance to the platen shaft 7a. FIG. 10 shows a state in which the bush lever member 103 and the bush 105 are assembled.

After the bush 105 is assembled, a fixed ring (for example, an E ring or a C ring) 109 shown in FIG. 1 is attached to the reduced diameter portion 7d of the platen shaft 7a.
Is installed. By attaching the fixing ring 109, the attachment state of the bush 105 and the bush lever member 103 to the platen shaft 7a is maintained. It should be noted that the assembled state is shown in FIGS. 1 and 11, and the relation of assembly of the respective members is shown in FIG. The above is the configuration of the attachment / detachment jig 101 and the assembling procedure, but the shaft support member 101 ′ on the opposite side has the same configuration.

On the other hand, the housing 1 side to which the platen 7 is attached has the following structure. That is, as shown in FIG. 2, the engagement recess 113 is formed in one side wall 111 of the housing 1.
Are formed. The upper end of the engaging recess 113 is an opening 113a, and the circular part 11 is continuous with the opening 113a.
3b is formed. The opening 113a is a circular portion 1
Its width is narrower than that of 13b. When the shaft member 105b of the bush 105 is in the vertically long state, the bush 105 is allowed to pass, and when it is in the horizontally long state, the passage is restricted. The opening 1 is provided on the right side of the engaging recess 113 in the drawing.
15 is formed. The engaging portion 103c of the bush lever member 103 engages with the opening 115. The other side wall 111 'of the housing 1 is also formed with a similar engaging recess 113' and opening 115 '.

The operation will be described based on the above configuration. First, the case where the platen 7 is attached between the side walls 111 and 111 ′ of the housing 1 will be described. First, at both ends of the platen shaft 7a, as shown in FIG.
Install. Then, in each of the shaft support members 101 and 101 ′, the opening 103b of the bush lever member 103 is formed.
Is fitted to the shaft member 105b of the bush 105. Next, the tip ends of the bush lever members 103 and 103 of the shaft support members 101 and 101 'are respectively held by both hands, and the platen 7 is suspended.

Next, as shown by the solid lines in FIGS. 3 and 4,
The platen 7 is lowered toward the side walls 111 and 111 ′ of the housing 1. Then, the shaft members 105b and 105b of the bushes 105 and 105 of the shaft support members 101 and 101 'are
The side walls 111 and 111 'are engaged with the engaging recesses 113 and 113'. At that time, since the shaft members 105b and 105b of the bushes 105 and 105 'are in a state as shown in FIG. 5 (a vertically long state), the engaging recesses 113 and 11 are formed.
Engage smoothly without getting caught in 3 '.

Shaft member 105 of bush 105, 105 '
When b and 105b are engaged with the engaging recesses 113 and 113 ', the bush lever members 103 and 103 are rotated in the direction indicated by the arrow a in FIGS. 3 and 4. By this operation, the bushes 105, 105 are also rotated in the same direction, and the shaft members 105b, 10b of the bushes 105, 105 are rotated.
5b rotates by 90 ° and changes to a horizontally long state. Thereby, the engaging recesses 113 of the bushes 105, 105,
The upward disengagement from 113 'is in a restricted state. After that, by engaging the locking portions 103c, 103c of the bush lever members 103, 103 with the openings 115, 115 'of the side walls 111, 111', that state is maintained. Also, the bush lever member 10
Since the elastic holding force is exerted by mounting the 3, 103 on the outside of the side walls 111, 111 ′, the attached state can be retained by itself, but the locking portion 103
The engagement structure between the c and 103c and the openings 115 and 115 ′ makes it more reliable. This completes the work of attaching the platen 7. In addition, in FIG. 3 and FIG. 4, the attachment state is shown by a virtual line or a broken line.

Next, the case where the platen 7 is removed from the housing 1 will be described. First, each shaft support member 101, 10
1'Bush lever member 103, locking portion 10 of 103
The engagement relationship between 3c and 103c and the openings 115 and 115 'is released. Next, the bush lever members 103, 10
3 is rotated in the direction opposite to the arrow a in FIGS. 3 and 4,
The state shown by the solid line in FIG. As a result, the bushes 105, 105 also rotate in the same direction, and the shaft member 1
05b and 105b are in a vertically long state. After that, the end portions of the bush lever members 103, 103 are gripped and the whole is pulled up. Shaft member 105 of bush 105, 105
Since b and 105b are changed to the vertically long state, they can be disengaged from the engaging recesses 113 and 113 ', and thus the platen 7 is disengaged from the housing 1.

According to this embodiment, the following effects can be obtained. First, the platen 7 can be easily attached and detached. For example, even when the platen 7 is removed in order to remove the adhered paper dust, the work becomes simple and the time required for the work is greatly reduced. Will be done. As a result, the operating rate of the printing device can be improved. This is because the shaft support members 101 and 101 'are attached to both ends of the platen shaft 7a, and the engagement between the shaft support members 101 and 101' and the engagement recesses 113 and 113 'of the side walls 111 and 111' of the housing 1. This is because the platen 7 is attached by a combined structure.

Further, the shaft support members 101, 1 according to the present embodiment.
In the case of 01 ′, the shape of the shaft member 105b of the bush 105 and the engagement recesses 113, 1 on the side walls 111, 111 ′ side.
In view of the relationship with the shape of 13 ', the platen 7 is configured so as not to be accidentally pulled out when attached, and the elastic holding force of the bush lever members 103, 103 and the bush lever members 103, 103. Locking part 10
The engaging structure of the openings 3c and 103c and the openings 115 and 115 'is configured to more securely maintain the attached state. Therefore, the platen 7 does not come off accidentally, and the attached state can be reliably retained.

Next, a second embodiment will be described with reference to FIGS. 13 and 14. In the case of this embodiment, the bush 105 and the bush lever member 103 of the first embodiment are used.
It shows an example in which and are manufactured in advance as an integrated body. The other structure is the same as that of the first embodiment, and the description thereof is omitted. Therefore, not only the same effects as in the case of the first embodiment can be achieved, but also the number of parts is reduced, so that there is an advantage that the assembling work becomes simple and the parts management becomes easy.

The present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, the locking portion 103c of the bush lever member 103 is attached to the side walls 111 and 111 '.
Although the openings 115, 115 'on the side are engaged with each other, it is not always necessary to do so, and the bush lever members 103, 103 may be simply pressed against the side walls 111, 111' from the outside. Good. Further, in each of the above-described embodiments, the label printer has been described as an example.
The same can be applied to other types of printers. Other than that, the configuration of each unit is not limited to the above-mentioned embodiment. Further, in the present embodiment, the setting is not limited to the outside of the body, but the inside may be set.

[0023]

As described above in detail, according to the platen mounting structure of the printer according to the present invention, the engagement relationship between the bushes of the pair of shaft support members and the engagement recesses formed on the pair of side walls of the housing. Since the platen is attached to the housing side and the bush lever member can be gripped and operated, the work of attaching and detaching the platen to the housing becomes easy, and the complicated tool-using process is required as in the past. There is no longer any need for a lot of work. Therefore, the maintenance work of the platen is simplified and the operating rate of the printing apparatus can be increased.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention in which shaft supporting members are attached to both ends of a platen.

FIG. 2 is a side view showing one side wall of the housing according to the first embodiment of the present invention.

FIG. 3 is a diagram showing the first embodiment of the present invention, and is a diagram of a state in which the platen is attached to the housing, as viewed from the outside.

FIG. 4 is a diagram showing the first embodiment of the present invention, as seen from the inside when the platen is attached to the housing.

FIG. 5 is a plan view of the bush according to the first embodiment of the present invention.

FIG. 6 is a side view of the bush according to the first embodiment of the present invention.

FIG. 7 is a plan view of the bush lever member, showing the first embodiment of the present invention.

FIG. 8 is a side view of the bush lever member showing the first embodiment of the present invention.

FIG. 9 is a front view showing a configuration of an end portion of a platen shaft according to the first embodiment of the present invention.

FIG. 10 is a plan view showing a state in which the bush and the bush lever member are assembled in the figure showing the first embodiment of the present invention.

FIG. 11 is a side view showing a state in which a shaft supporting member is attached to an end portion of a platen shaft, as seen from one side in the drawing showing the first embodiment of the present invention.

FIG. 12 is a diagram showing a first embodiment of the present invention and is an exploded side view of a shaft support member.

FIG. 13 is a side view showing an example in which the bush and the bush lever member are an integrated body in the view showing the second embodiment of the present invention.

FIG. 14 is a plan view showing an example in which the bush and the bush lever member are an integrated body in the view showing the second embodiment of the present invention.

FIG. 15 is a side view showing the configuration of a label printer in a conventional example.

FIG. 16 is a cross-sectional view showing a mounting structure of a platen to a housing in a conventional example.

[Explanation of symbols]

 1 Housing 7 Platen 7a Platen shaft 101 Shaft support member 101 'Shaft support member 103 Bush lever member 105 Bush 113 Engagement recess 113' Engagement recess

Claims (2)

[Claims] 1. A shaft supporting member is attached to each end of a platen shaft of a platen, and the shaft supporting member includes a bush rotatably mounted on the platen shaft and a grip portion integrally or separately mounted on the bush. A bush lever member is provided, and on the other hand, an engaging recess is formed in each of a pair of side walls of the casing of the printing apparatus, and the bush is held in the engaging recess by gripping the grip of the bush lever member. By engaging and rotating it to prevent the bush from coming off the engaging recess,
A platen mounting structure for a printing apparatus, wherein the platen is attached to the housing, and the platen is detached from the housing by a reverse operation. 2. The platen mounting structure for a printing device according to claim 1, wherein the bush lever member has a spring action.
In addition, an engaging portion is provided, and on the other hand, an opening is formed in the pair of side walls, and the engaging state is retained by engaging the engaging portion with the opening. The platen mounting structure of the printing device.