JPH02243356A - Impact dot head - Google Patents

Abstract

PURPOSE:To easily mount a protecting cover in a simple structure by forming an outer peripheral surface of said protecting cover of a member having low thermal conductivity and fixing said protecting cover by an elastic force generated through elastic deformation of a part of said protecting cover. CONSTITUTION:A radiator 1 of a head is covered with a net-like protecting cover 2 having low thermal conductivity. Therefore, it can be prevented, without deteriorating the radiating property, that a user inadvertently touches the surface of the head at high temperatures. An end of a fixed hook 3 of the protecting cover 1 is inserted in a grooved portion between a first fin 4 and a second fin 5 of the radiator 1. The protecting cover 2 is guided to slide downward along the grooved portion, so that the fixed hook 3 is engaged with an engaging portion 6 of the radiator 1. The grooved portion of the radiator 1 is formed tapered, having a different depth between upper and lower portions thereof. Since the groove at the upper portion is deep, the protecting cover 2 is readily guided by the tapered groove only by being pressed downward, and the fixed hook 3 expands right and left to be smoothly engaged with the engaging portion 6. When the fixed hook 3 is engaged with the engaging portion 6 of the radiator 1, the fixed hook 3 is pressed to the radiator 1 by the elastic force, whereby a positive fixing force is obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to impact dot heads.

[Conventional technology]

In general, in impact dot heads, the drive unit that drives the dot wires mostly uses electromagnets, and when printing for a long time, the head generates heat and the outer peripheral surface becomes hot.

For this reason, impact dot heads whose outer peripheral surfaces are made of a material with high thermal conductivity, such as iron or aluminum, pose a risk of burns if accidentally touched during or immediately after printing.

Some impact dot heads are fitted with rubber or plastic covers, primarily to prevent noise reduction. The conventional method for attaching these covers is to deform the cover into a bag-like shape to cover the head when the cover is made of rubber. Additionally, the plastic cover was attached to the head with screws or adhesive.

[Problem to be solved by the invention]

When attaching a cover, conventional rubber covers require pulling and unfolding the entire cover to attach it, making it difficult to assemble. Further, the conventional method of mounting using screws not only has poor workability, but also requires drilling screw holes on the outer peripheral surface of the head, resulting in high costs. When fixing with adhesive, it takes time to dry and obtain the desired fixing force, which significantly reduces productivity.

In order to solve these conventional problems, the present invention provides an impact dot head with a cover that has a simple structure and is easy to assemble.

[Means to solve the problem]

In order to solve the above problems, the impact dot head of the present invention has (1) a low thermal conductivity that does not cause burns on the outer peripheral surface (thermal conductivity of 5 x 10-3 ca, 17 /s-cm2.
℃・cm or less).

(2) As a means for fixing the member with low thermal conductivity,
A part of the member with low thermal conductivity is elastically deformed and fixed by elastic force.

(3) The guide portion for guiding the elastically deformable member 3 has a tapered shape.

(4) Positioning the member with low thermal conductivity by the protrusion 7.8.12.

(5) A part of the member having low thermal conductivity is made flat so that a cautionary note can be pasted thereon.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the protective cover of the present invention.

As shown in the figure, the radiator 1 of the impact dot head is covered with a protective cover 2 having a mesh shape and low thermal conductivity, so as to prevent accidental contact with a high-temperature surface without compromising the heat dissipation characteristics. A suitable material for the protective cover 2 is synthetic resin such as polybutylene terephthalate (PBT) or polyethylene terephthalate (PET). Figure 2 shows how to attach the protective cover. Installation is performed by covering the heat sink 1 with the protective cover 2 from above. First, insert the tip of the fixing claw part 3 of the protective cover 2 into the groove between the first fin 4 and the second fin 5 of the radiator 1, use this groove as a guide groove to slide the protective cover 2 downward, and then The part 3 is attached by engaging the fixing hook part 6 of the radiator 1. As shown in Figure 3, the guide groove of the heatsink 1 has a tapered shape with different groove depths on the top and bottom, and the upper groove is deeper and can be guided by the tapered portion simply by pushing the protective cover 2 downward. The fixed claw part 3 spreads to the left and right so that the fixed claw part 6 can be smoothly engaged with the fixed claw part 6.

When the fixed claw part 3 engages with the fixed claw part 6 of the radiator 1,
The fixing claw portion 3 is pressed against the radiator 1 by the elastic force, and a reliable fixing force is obtained. As shown in FIG. 4, positioning in the front-rear direction is performed by sandwiching the radiation fins 9 of the heat radiator 1 between positioning claws A7 and B8 provided at the lower part of the upper surface of the protective cover 2. At this time, if the positioning pawl B8 is tilted in the opposite direction to the positioning pawl A7, more reliable positioning can be achieved due to the elasticity of the positioning pawl B8 when engaging with the heat radiation fins.

5, 6, and 7 show other embodiments of the shape of the fixing claw portion of the protective cover 2 of the above embodiment.

FIG. 5 shows an embodiment in which a guide protrusion 11 is provided on the arm portion 10 of the fixing claw 3. This protrusion 11 is inserted into the groove of the heat dissipation fin 9, and the protective cover 2 is inserted into the heat dissipation device 1. wear it. FIG. 6 shows an embodiment in which the fixing claw 3 of the protective cover 2 has a hole at the tip, and FIG. 7 shows the fixing claw 3 of the protective cover 2.
An embodiment is shown in which the radiator has a convex shape and the fixing claw part 6 of the radiator has a hole shape.

FIG. 8 shows another embodiment of the shape of the positioning claw C12 of the above embodiment. As shown in the figure, the positioning claw C12 is provided at one location in this case, and the radiation fin 9 is inserted between the front wall portion 13 of the protective cover 2 and the positioning claw C12 for positioning.

FIG. 9 shows an embodiment in which the protective cover 2 is attached to the impact dot head 14 from the front. As shown, the protective cover 2 is inserted into the impact dot head 14 from the nose 15 side.

When inserted, the protective cover 2 is attached using the outer peripheral surface of the radiator 1 as a guide surface, and the protective cover 2 is chamfered 16 to facilitate insertion into the radiator 1.

The protective cover 2 is fixed to the radiator 1 by fixing claws 3. As shown in FIG. 10, the fixing claws 3 are engaged with the heat radiating fins, and the protective cover 2 is fixed to the heat radiator 1.

FIG. 11 shows an embodiment of claim 5. As shown in the diagram, a warning sticker 1 with warnings such as ``Caution for high temperature'' written on it.
7 is attached to the flat surface of the protective cover 2, further preventing burns.

〔Effect of the invention〕

As described above, the impact dot head of the present invention comprises a protective cover made of a material with low thermal conductivity on the outer peripheral surface of the impact dot head, and a part of the protective cover is elastically deformed as means for fixing the protective cover. Since the protective cover is attached by being fixed by elastic force, the protective cover can be easily attached with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the impact dot head and protective cover of the present invention. FIG. 2 is a perspective view showing how the protective cover is attached to the radiator. FIG. 3 is a partial plan view showing the fixing claw portion of the protective cover of the present invention. FIG. 4 is a partial sectional view of the impact dot head and protective cover of the present invention. FIG. 5, FIG. 6, and FIG. 7 are partial perspective views showing other embodiments of the fixing claw portion of the protective cover of the present invention. FIG. 8 is a partial sectional view showing another embodiment of the impact dot head and protective cover of the present invention. FIG. 9 is a perspective view showing another embodiment of the impact dot head and protective cover of the present invention. FIG. 10 is a partial sectional view of the impact dot head and protective cover of the present invention. FIG. 11 is a perspective view showing an embodiment in which a warning sticker is attached to the protective cover of the present invention. 17... Warning sticker or more 1... Heat sink 2... Protective cover 3... Fixing claw 4... Q. First fin 5... Second fin 6... Fixing claw hook is part 7. ...Positioning claw A 8...Positioning claw B 9...Radiating fin 10...Arm part 11...Guide projection 12...Positioning claw C 13...Front wall part 14...Impact Dot head 15... Nose 16... Chamfered surface Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (and 1 other person) Figure 2 Quick view

Claims (5)

[Claims] (1) An impact dot head characterized in that the outer peripheral surface is made of a material with low thermal conductivity. (2) As a means for fixing the member with low thermal conductivity,
2. The impact dot head according to claim 1, wherein a part of the member with low thermal conductivity is elastically deformed and fixed by elastic force. (3) The impact dot head according to claim 1, wherein the guide portion for guiding the elastically deformable member 3 has a tapered shape. (4) The impact dot head according to claim 1, wherein the member with low thermal conductivity is positioned by the convex portions 7, 8, and 12. (5) The impact dot head according to claim 1, wherein a part of the member with low thermal conductivity is made flat so that a cautionary note can be pasted thereon.