JPH04115672U - Thermal printer leaf spring mounting device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable one-touch installation of a leaf spring that presses a thermal head against a platen in a thermal printer without using screws. [Structure] A platen 14 is rotatably provided on the main body frame 11, and a thermal head 21 is brought into contact with the platen 14. The thermal head 21 is pressed toward the platen by the head pressing portion 32 of the leaf spring 31. The mounting base 33 located at the rear of the leaf spring 31 is inserted into the insertion part 44 of the upper plate 41. At the rear of the insertion part 44,
By pressing down the rear end of the leaf spring 31 with a convex portion 46 protruding from the lower surface of the upper plate 41, the upper plate 41 and the mounting base 33 of the leaf spring 31 are brought into close contact. At the same time, when the leaf spring 31 is positioned by fitting the hole 36 and the protrusion 47 provided in the leaf spring 31 and the upper plate 41, the mounting base 33 of the leaf spring 31 can be fixed to the lower surface of the upper plate 41. The upper plate 41 is fixed to the main body frame 11.

Description

[Detailed explanation of the idea]

0001 [Purpose of invention]

0002

[Industrial application field]

This invention uses a leaf spring that presses the thermal head of a thermal printer against the platen. The present invention relates to a mounting device.

0003

[Conventional technology]

The conventional thermal printer is as shown in Japanese Utility Model Application No. 61-150145. The platen is rotatably supported on the main body frame, and the thermal head is attached to this platen. The pad is pressed by a leaf spring, the rear part of this leaf spring is attached to the upper plate, and this upper plate is fixed to the main body frame.

0004 In such a thermal printer, as shown in FIG. 2 is attached to the upper plate 3.

[0005]

[Problem that the idea aims to solve]

This conventional method of attaching leaf springs requires less man-hours and time to screw the leaf springs during manufacturing. The disadvantage is that it is time consuming and costly.

[0006] The present invention was developed in view of these points, and it is possible to attach the leaf spring to the upper plate using screws. The purpose is to enable one-touch operation without using .

[0007] [Structure of the idea]

[0008]

[Means to solve the problem]

The present invention includes a main body frame 11 and a prism rotatably provided on the main body frame 11. The platen 14, the thermal head 21 in contact with this platen 14, and this thermal A leaf spring 31 that presses the head 21 toward the platen, and a head pressing portion 32 of this leaf spring 31. Hold the mounting base 33 located at the rear of this leaf spring 31 with the leaf spring 31 protruding forward, and then In a thermal printer equipped with an upper plate 41 fixed to the body frame 11, the upper plate 41 The mounting base 33 of the leaf spring 31, which is provided at the rear of the plate and is in close contact with the lower surface of the upper plate 41, is inserted. An insertion part 44 that protrudes from the lower surface of the upper plate 41 further behind the insertion part 44, and A convex portion 46 that presses down the rear end of the spring 31 is provided at a close contact portion between the leaf spring 31 and the upper plate 41, A thermal prism having positioning parts 36 and 47 that are fitted together to position the leaf spring 31. This is Rinter's leaf spring mounting device.

[0009]

[Effect]

In the present invention, the mounting base 33 of the leaf spring 31 is inserted into the insertion part 44 of the upper plate 41, and the By pushing down the rear end of the leaf spring 31 with the protrusion 46 provided on the lower surface of the plate 41, the upper The plate 41 and the mounting base 33 of the plate spring 31 are brought into close contact. At the same time, leaf spring 31 and upper plate 41 The positioning parts 36 and 47 provided in the close contact part fit together to position the leaf spring 31. Ru. As a result, the mounting base 33 of the leaf spring 31 is fixed to the lower surface of the upper plate 41.

0010

【Example】

Hereinafter, the present invention will be described in detail with reference to embodiments shown in FIGS. 1 to 4.

[0011] As shown in FIG. 1, a paper guide 12 is integrally provided at the bottom of the main body frame 11. , a platen 14 is placed above this paper guide 12 with a paper feed gap 13 in between, and the platen It is rotatably provided on the main body frame 11 via a shaft 15. Platen shaft 15 is shown It is driven by a motor that rotates the platen 14.

0012 A thermal head 21 is in contact with this platen 14. This thermal head 21 is integrally attached to the lower surface of the heat sink 22.

[0013] This heat sink 22 consists of a heat sink main body 23 that is in close contact with the thermal head 21, and a main body frame 23 that is in close contact with the thermal head 21. The bearing part 25 fitted to the pin 24 attached to the arm 11 is made of extruded aluminum material. It is integrally molded and can swing freely on the main body frame 11 using the pin 24 as a fulcrum. It is supported pivotally and is pressed toward the platen by a leaf spring 31.

[0014] This leaf spring 31 is located at the rear with its head pressing portion 32 protruding forward. A mounting base 33 is held on the upper plate 41 by means to be described later. This upper plate 41 will be described later. It is fixed to the upper part of the main body frame 11 by means of.

[0015] Then, the front end of the heat sink 22 is pressed down by the head pressing part 32 of the leaf spring 31, Thermal head 21 is pressed against platen 14.

[0016] Next, FIGS. 2 and 3 show the mounting structure of the leaf spring 31. That is, slotted hole 42 The rear center 43 of the upper plate 41, which is formed with A part of the bent elongated hole 42 serves as an insertion groove 44 as an insertion portion. In this insertion groove 44 A central projecting piece 34 at the rear of the leaf spring 31 that is in close contact with the lower surface of the upper plate 41 is inserted.

[0017] Convex on the lower surface of the left and right protruding pieces 45 that protrude from the rear of the upper plate 41 further behind the insertion groove 44 A portion 46 is provided to protrude from the rear of the left and right protruding pieces 35 that protrude from the rear of the leaf spring 31. The ends are pressed down.

[0018] Furthermore, holes 36 and protrusions 47 are provided as positioning parts in the close contact parts of the leaf spring 31 and the upper plate 41. The hole 36 and the protrusion 47 fit together to position the leaf spring 31. Ru.

[0019] The method of installing this leaf spring 31 is to insert the center protrusion of the leaf spring 31 into the insertion groove 44 of the upper plate 41. While inserting the piece 34, insert the rear ends of the left and right projecting pieces 35 of this leaf spring 31 into the convex part 46 of the upper plate 41. The central protrusion 34 of the leaf spring 31 is placed on the upper plate 41 using the convex portion 46 as shown in FIG. By pressing against the rear center 43, the upper plate 41 and the mounting base 33 of the leaf spring 31 are brought into close contact. Ru.

[0020] At the same time, the holes 36 and protrusions 47 provided in the contact parts of the leaf spring 31 and the upper plate 41 are aligned with each other. By positioning the leaf springs 31 by fitting each other, the fitted state in the insertion groove 44 is maintained. Fixed.

[0021] The above leaf spring installation operation can be done instantly, and the leaf spring 31 can be attached without using screws. It can be attached to the upper plate 41 with one touch.

[0022] In addition, in this embodiment, a part of the elongated hole 42 is used as an insertion groove 44 as an insertion part, but the upper By folding the rear center 43 of the plate 41 downward into a U shape, a U groove as an insertion part is formed. It's okay. In addition, a hole 36 is provided in the leaf spring 31 as a positioning part, and a hole 36 is provided in the upper plate 41. Although a protrusion 47 is provided, the hole 36 and protrusion 47 may be reversed.

[0023] Next, FIG. 4 shows the mounting structure of the upper plate 41. That is, the upper part of the main body frame 11 A notch groove 51 is formed in the notch groove 51, a concave groove 52 is provided on the front side of the notch groove 51, and a concave groove 52 is provided on the front side of the notch groove 51. A front locking portion 53 is provided integrally with the main body frame 11 on the upper side, and the front locking portion 53 Therefore, the front part 48 of the upper plate 41 pushed up by the reaction force of the leaf spring 31 is locked from above. It is. A protrusion 54 as a positioning part is provided on the front side locking part 53 and the front part 48 of the upper plate 41. and a hole 49 are provided, and the protrusion 54 and hole 49 fit together so that the upper plate 41 is approximately in position. It is set in place.

[0024] Furthermore, an Ω groove 55 formed in an Ω shape on the rear side of the notch groove 51 of the main body frame 11 is connected to the concave groove 52. The rear part 50 of the upper plate 41 is fitted into this Ω groove 55. Ω groove 55 The entrance part includes a rear locking part 56 that locks the rear part 50 of the upper plate 41 from below, and an upper holding part. 57 are provided. Inside the Ω groove 55, there is a lower slope 58 that slopes downward to the right and a slope that slopes downward to the left. An upper inclined surface 59 is provided.

[0025] Then, the method of installing this upper plate 41 is to attach the rear part 50 of the upper plate 41 downward to the right. Insert it all the way into the groove 55, then lower the front part 48 of the upper plate 41 to the lowest part 51a of the notched groove 51, Shift the top plate 41, which is tilted downward to the left, to the left and insert the front part 48 of the top plate 41 into the groove 52. do.

[0026] At this time, the head of the leaf spring 31 attached to the upper plate 41 as shown in FIG. Since an upward reaction force is acting on the pressing portion 32, as shown in FIG. The front part 48 is pushed up by the reaction force of the leaf spring 31 and is locked by the front locking part 53. At the same time, the projection 54 and the hole 49 are fitted to each other, and the position is approximately determined.

[0027] On the other hand, the upward reaction force acting on the tip of the leaf spring 31 causes the rear part 50 of the upper plate 41 to is pressed downward using the front locking portion 53 as a fulcrum, but the Ω groove 55 is It is locked from below by the rear side locking part 56.

[0028]

[Effect of the idea]

According to the present invention, the insertion part provided at the rear of the upper plate is closely attached to the lower surface of the upper plate. Insert the mounting base of the leaf spring and protrude from the bottom surface of the upper plate further back from this insertion part. The convex part pushes down the rear end of the leaf spring, and Since the leaf spring is positioned by fitting the locating part, it can be done without using screws. The leaf spring can be attached to the upper plate with a single touch by a simple insertion operation, which allows Parts and manufacturing man-hours can be reduced, leading to lower costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a thermal printer equipped with a leaf spring mounting device of the present invention.

FIG. 2 is a bottom view of the leaf spring mounting device.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view of the upper plate mounting portion of the thermal printer of the present invention.

FIG. 5 is a sectional view of a conventional leaf spring mounting portion.

[Explanation of symbols]

11 Main frame 14 Platen 21 Thermal head 31 Leaf spring 32 Head pressing part 33 Mounting base 41 Top plate 44 Insertion groove as insertion part 46 Convex part 36, 47 Holes and protrusions as positioning parts

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Takaichi Matsumoto 1-19-43 Higashioizumi, Nerima-ku, Tokyo Stocks Inside Tamura Manufacturing Company

Claims (1)

[Scope of utility model registration request] Claim 1: A main body frame, a platen rotatably provided on the main body frame, a thermal head in contact with the platen, a leaf spring pressing the thermal head toward the platen, and this plate. In a thermal printer equipped with an upper plate fixed to the main body frame by holding a mounting base located at the rear of the leaf spring with the head pressing portion of the spring protruding forward, the thermal printer is provided at the rear of the upper plate, An insertion part into which the mounting base of the leaf spring is inserted, which is in close contact with the lower surface of the upper plate, and a protrusion that protrudes from the lower surface of the upper plate further back from this insertion part and presses down the rear end of the leaf spring. 1. A plate spring mounting device for a thermal printer, comprising: a positioning portion provided at a close contact portion between an upper plate and a plate spring, and fitting each other to position the plate spring.