JPS61225076A - Platen support apparatus - Google Patents

Abstract

PURPOSE:To attain to reduce the number of parts, to shorten the fixing time of a platen and to improve paper feed, by providing a support part 2 for elastically holding both end parts of a metal member 1 and earthing the metal member 1 opposed to a paper guide 5 to a metal plate 6. CONSTITUTION:When both end parts of a metal member 1 are engaged with the gap between the receiving parts 3 and elastic pieces 4 of the support parts 2, the elastic pieces 4 press the metal member 1 to the receiving parts to elastically hold the metal member 1 between the elastic pieces 4 and the receiving parts 3 and the movement of the metal member 1 in before-and-behind, left-and-right and up-and-down directions is inhibited. That is, the mount work of a platen 15 can be performed within a short time by an one touch system and it is unncessary to use an engaging member and the number of parts can be reduced. An engaging pawl 14 is engaged with the metal member 1 and projected pieces 19 are engaged with a frame 8 to prevent the movement of the metal member 1 not only in an up-and-down direction but also in a left-and-right direction and the mount state of the platen 15 becomes stable. Further, the static electricity generated by the friction at the time of the feeding of paper 7 and an ink ribbon 20 is conducted to the metal member 1 and further conducted to a base 6 through a lead wire 21 to be removed and, therefore, both of the paper 7 and the ink ribbon 20 can be smoothly fed.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a platen support device.

Conventional technology Conventionally, some platens consist of an elastic member and a metal member that holds the elastic member.One way to securely attach such a platen is to fix the metal member with a fastening member. There is.

Problems to be Solved by the Invention However, since such a device uses a fastening member, the number of parts increases and the installation work takes time. Furthermore, static electricity may prevent the paper from being fed around the replaten.

The present invention was made in view of the above points, and provides a platen support device that can reduce the number of parts, fix the platen in a short time, and improve paper feeding. The purpose is to obtain.

Means for Solving the Problems Support parts 2 are provided to elastically hold both ends of the metal member l. Further, the metal member 1 facing the paper guide 5 is grounded to another metal plate 6.

action By holding the metal member 1 on the support part 2.

The fastening member is omitted, the number of parts is reduced, and the work of attaching the metal member 1 can be completed in a short time.

Further, static electricity generated due to friction between the paper 7 and the paper guide 5 is released to the metal plate 6 via the metal member 1, and the paper 7 is
improves the feed rate.

Example An embodiment of the present invention will be described based on the drawings.

First, a feed roller shaft 10 for holding a feed roller 9 and a carrier shaft 11 are rotatably held on the left and right walls of the frame 8 which has an upper and lower opening. A carrier 13 on which a thermal head 12 serving as a print head is mounted is attached to the carrier shaft 11 so as to be slidable in the axial direction.

Support parts 2 are formed on the left and right walls of the frame 8 between the feed roller shaft 10 and the carrier shaft 11 to elastically hold both ends of a metal member, which will be described later. That is, the left and right walls of the frame 8 are formed with highly rigid receiving portions 3 and elastic pieces 4 that face these receiving portions 3 with an interval equal to the thickness of the metal member. A locking pawl 14 is formed at the tip of each of these elastic pieces 4 . Further, a base 6 made of a metal plate is provided behind the frame 8, and a paper guide 5 is provided between the feed roller shaft 10 and the carrier shaft '11.

A horizontally long platen 15 is provided.

This platen 15 includes an elastic member 17 whose cross section is polygonal and whose surface 16 facing the thermal head 12 is formed into a 50R convex surface, and which holds this elastic member 17 over its entire length, with both ends of the elastic member 17 The metal member 1 extends further to the side. A guide portion 18 is formed in the center of the metal member 1 and extends vertically in a curved manner, and a pair of projecting pieces I9 that sandwich the frame 8 from both sides extend downward at the left end of the metal member 1. It is formed by letting it come out.

In such a configuration, both ends of the metal member 1 are connected to the receiving portion 3.
and the elastic piece 4.

1 by the elastic piece 4 pressing the metal member 1 against the receiving part 3
The metal member 1 is elastically held between the elastic piece 4 and the receiving portion 3, and movement in the front-rear, left-right, and up-down directions is prevented. That is,
The work of attaching the platen 15 can be done in a short time with one touch, since it is sufficient to simply fit the metal member 1 into the gap between the receiving part 3 and the elastic piece 4 that constitute the supporting part 2. Further, since no fastening member is used, the number of parts can be reduced.

Furthermore, the locking pawl 14 formed on the elastic piece 4 is connected to the metal member 1.
The protrusion 19 formed on the metal member 1 engages with the frame 8 to prevent the metal member l from moving upward, and the protrusion 19 formed on the metal member 1 engages with the frame 8 to prevent the metal member l from moving in the left-right direction. , the mounting condition of the platen 15 becomes more stable.

Further, in order to print on the paper 7 wound around the platen 15, the thermal head 12 is brought into pressure contact with the elastic member 17.
Surface 1 of this elastic member 17 facing the thermal head 12
6 is formed to have a convex surface of 50R, so even if the thermal head 12 comes into contact with the tilted platen 15 off the center, the apex of the surface 16 facing the thermal head 12 will be crushed by the pressing force of the thermal head 12. Due to this.

Since the heating element (not shown) of the thermal head 12 reliably contacts the paper 7 evenly above and below via the ink ribbon 20, there is no shading at the top and bottom of the print during printing, and clear printing can be performed. It is possible.

Furthermore, static electricity generated due to friction caused by feeding the paper 7 or friction caused by feeding the ink ribbon 20 is transmitted to the metal member 1, and further transmitted to the base 6 via the conductive wire 21, where it is removed. Therefore, paper 7, ink ribbon 2
The zero feed can be made smooth.

Effects of the Invention As described above, the present invention is provided with a support portion that elastically holds both ends of the metal member, so that the platen mounting work can be done in a short time and the fixing member can be omitted. The number of parts can be reduced, and since the support part is formed of a receiving part that supports the metal member and an elastic piece that resiliently presses the metal member to this receiving part, the metal member can be attached with one touch. This further improves the ease of attaching and detaching the paper.Furthermore, since the metal member facing the paper guide is grounded to another metal plate, static electricity generated by paper friction is dissipated, making paper feeding smoother. Also, the surface of one elastic member facing the print head is 30
By forming the convex surface with a radius of R or more, the elastic member deforms due to the pressing force of the print head, so that the print head can always be brought into uniform contact with the top and bottom. This prevents shading from occurring at the top and bottom of the print, and makes it clear. This has the effect of making it possible to print characters with ease.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an exploded perspective view with a portion cut away, FIG. 2 is a plan view with a portion cut away, and FIG. 3 is a partially cutaway view. 4 is a partially cutaway side view, FIG. 5 is a partially cutaway perspective view, and FIG. 6 is an enlarged side view of the elastic member. l... Metal member, 2... Support part, 3... Receiving part, 4
... Elastic piece, 5... Paper guide, 6... Base (other metal plate), 7... Paper, 12... Thermal head (print head), 16... Opposed to the thermal head surface (surface facing the print head), 17... elastic member. 18...Guide section" 0...4 million 8I5

Claims (1)

[Claims] 1. A platen consisting of a horizontally long elastic member facing the print head and a metal member that holds the elastic member over its entire length and has both ends extending outward from both ends of the elastic member. established,
A support device for a platen, characterized in that a support portion is provided to resiliently hold both ends of the metal member. 2. The platen according to claim 1, wherein the support portion is formed by a receiving portion that supports both ends of the metal member and an elastic piece that elastically presses the metal member against the receiving portion. Support device. 3. The platen support device according to claim 1, wherein the surface of the elastic member facing the print head is formed into a convex surface of 30R or more. 4. Providing a platen consisting of a horizontally elongated elastic member facing the print head and a metal member that holds the elastic member over its entire length and has both ends extending outward from both ends of the elastic member;
A guide portion facing the paper guide is formed in a portion of the metal member that holds the elastic member, and support portions that elastically hold both ends of the metal member are provided, and the metal member is attached to another metal plate. A platen support device characterized by being grounded.