Back to results
US 4,149,462 AGranted
Constant pressure mechanism for printing operation of label printing machine
AssigneeKabushiki Kaisha Sato Kenkyusho
InventorYo Sato
Life of this patent
Estimating the term…
Abstract
A constant pressure mechanism for the printing operation of a label printing machine; the machine has a hand lever, a printing lever, a printing head attached to the printing lever, a constant pressure spring secured between the hand lever and the printing lever and a platen to carry a label strip; when the hand lever is squeezed, the printing lever is turned by the force of the constant pressure spring to strike the printing head against the label strip on the platen, and immediately after the printing operation, the printing head is slightly released from the platen by means of releasing members.
Claims12
A constant printing pressure mechanism for a label printing machine, comprising:
- a frame for supporting all elements of said constant printing mechanism;
- an operating lever pivotable between an operating position and a released position;
- an operating lever pivot shaft on said frame for said operating lever whereby said operating lever pivots between its said positions;
- a printing lever pivotable toward and away from a printing position;
- a respective printing lever pivot shaft on said frame for said printing lever, whereby said printing lever pivots between its said positions;
- a printing head carried on and pivotable with said printing lever;
- a constant printing pressure spring connected between said operating lever and said printing lever and being chargeable upon pivoting of said operating lever toward said operating position;
- upon discharge of said spring, said spring biasing said printing lever to pivot toward said printing position;
- restraining means for restraining pivoting motion of said printing lever to said printing position;
- restraining means disconnect means on said operating lever for disconnecting said restraining means for restraining motion of said printing lever after predetermined pivoting motion of said operating lever toward its said operating position, whereby said constant pressure spring is charged before said restraining means is released and said printing lever is free to pivot under the bias of the discharge of said constant printing pressure spring after said restraining means have been released;
- a platen positioned to be engaged by said printing head as said printing lever pivots to said printing position;
- means for interposing a label to be imprinted between said printing head and said platen;
- printing head release means for separating said printing head from said platen after said printing head had engaged said platen under the influence of said constant printing pressure spring.
10 more elements
A constant printing pressure mechanism for a label printing machine, comprising:
- a frame for supporting all elements of said constant printing mechanism;
- an operating lever pivotable between an operating position and a released position;
- an operating lever pivot shaft on said frame for said operating lever whereby said operating lever pivots between its said positions;
- a printing lever pivotable toward and away from a printing position;
- a respective printing lever pivot shaft on said frame for said printing lever, whereby said printing lever pivots between its said positions;
- a printing head carried on and pivotable with said printing lever;
- a constant printing pressure spring connected between said operating lever and said printing lever and being chargeable upon pivoting of said operating lever toward said operating position;
- upon discharge of said spring, said spring biasing said printing lever to pivot toward said printing position;
- restraining means for restraining pivoting motion of said printing lever to said printing position;
- restraining means disconnect means on said operating lever for disconnecting said restraining means for restraining motion of said printing lever after predetermined pivoting motion of said operating lever toward its said operating position, whereby said constant pressure spring is charged before said restraining means is released and said printing lever is free to pivot under the bias of the discharge of said constant printing pressure spring after said restraining means has been released;
- a platen positioned to be engaged by said printing head as said printing lever pivots to said printing position;
- means for interposing a label to be imprinted between said printing head and said platen;
- printing head release means for separating said printing head from said platen after said printing head has engaged said platen under the influence of said constant printing pressure spring;
- said printing head release means comprises a release spring connected with said printing lever when said printing head moves near said platen, and said release spring being charged when said printing head engages said platen;
- said operating lever and said printing lever are provided with respective opposed abutments;
- said release spring being connected between said opposed abutments for normally urging said abutments and their respective said levers so as to urge said printing lever to lift said printing head away from said platen.
13 more elements
Dependencies are inferred from the claim text.