Inkjet Head Mounting With Spring Locking for Print Accuracy
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Solution Overview
Problem
Existing ink jet printing apparatuses face challenges with inefficient attachment and detachment of head parts, leading to variations in printing accuracy due to inconsistent bolt tightness and prolonged maintenance times.
Innovation Solution
The apparatus incorporates an urging device with a shaft part, bracket part, spring part, and lock pin mechanism that allows for easy attachment and detachment of head parts by up-down and rotational movements, ensuring consistent urging force and precise positioning through eccentric and pressure pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If head parts are attached with fixing screws or fixing bolts, then the head parts are securely fixed to the line block frame, but it takes time to attach and detach the head parts and the efficiency of maintenance work is significantly poor
Solution Approach 1:
The attachment mechanism is segmented into modular components: a fixing pin that can be independently inserted and removed, a separate locking member with spring element, and a head part that can be detached without affecting other components. This segmentation allows rapid attachment by simply inserting the fixing pin and locking member, eliminating the need to manipulate multiple screws or bolts simultaneously.
Solution Approach 2:
Instead of using threaded fasteners that require screwing motion, the invention inverts the approach by using a straight insertion fixing pin combined with a spring-loaded locking mechanism. The locking member engages with a groove on the fixing pin through simple vertical movement rather than rotational threading, dramatically reducing attachment time while maintaining secure fixation.
2Reliability
If head parts are attached with fixing screws or fixing bolts, then the head parts are securely fixed to the line block frame, but the tightness of the bolt changes every time the head part is attached causing printing accuracy to vary
Solution Approach 1:
The fixing pin is pre-formed with a precise groove at its lower end before assembly, and the locking member is pre-equipped with a spring element and engagement protrusion. This preliminary preparation ensures that when the locking member engages with the groove, it automatically establishes consistent positioning and tightness without requiring manual adjustment during each attachment operation, thereby maintaining printing accuracy.
Solution Approach 2:
The spring element in the locking member provides self-adjusting tension that automatically maintains consistent engagement force between the locking member and fixing pin. This self-service mechanism eliminates the need for manual tightening adjustments, ensuring that the same tightness is achieved every time the head part is attached, thus preventing printing accuracy variations.
3Ease of operation
If a lock pin is used to fix the head part, then the attachment is simplified, but the lock pin may be damaged if it directly contacts the base part surface
Solution Approach 1:
A groove is introduced as an intermediary feature on the base part surface that receives and protects the fixing pin. Instead of the fixing pin directly contacting the solid base part surface which could cause damage, the groove provides a protected receptacle that guides the fixing pin and distributes contact forces, thereby preventing damage while maintaining the simplicity of the attachment operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates quick and reliable attachment of head parts, maintaining printing accuracy by minimizing positional shifts and reducing maintenance time, while preventing damage and improving overall efficiency.
Implementation Method 1
a spring part attached to the shaft part and for urging the bracket part downward
Data Source
Figure 1
Figure 2
Figure 3(a)
AI summary
To provide an ink jet printing apparatus capable of easily attaching and detaching a head part and capable of preventing a printing accuracy from varying as much as possible every time the head part is attached. The present invention provides an ink jet printing apparatus, in which a printing part includes a plurality of head parts each including a head main body part and a base part provided at a peripheral edge of the head main body part, a line block frame for supporting the base part from below, and an urging device for attaching the base part to the line block frame with the base part urged toward the line block frame, the urging device includes a shaft part attached to the line block frame, a bracket part attached via a bearing part to enable up-down movement along the shaft part, a spring part for urging the bracket part downward, and a lock pin protruding downward from the bracket part, the lock pin is arranged on an upper surface of the base part at the time of urging, and the lock pin is lifted upward at the time of releasing urging.