Printer

Patent metadata

Field	Value
Publication number	US-9834014-B2
Application number	US-201715404651-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Jan 14, 2016
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The disclosure discloses a printer including a printing head, a DC motor, an energization control part, a short-circuiting device, a temperature detecting device, and a braking control part. The DC motor is configured to generate a driving force for feed by a feeder. The energization control part is configured to control energization by an energizing device. The short-circuiting device is configured to short-circuit a positive electrode and an negative electrode of the DC motor and brake when deenergized under control of the energization control part. The temperature detecting device is configured to detect a temperature of ambient surroundings. The braking control part is configured to control the short-circuiting device in accordance with the temperature detected by the temperature detecting device, to thereby variably control an operation mode of the braking by the short circuiting.

First claim

What is claimed is:

1. A printer comprising:
a feeder configured to feed a print-receiving medium;
a printing head configured to perform print on a desired print area of said print-receiving medium fed by said feeder;
a DC motor configured to generate a driving force for feeding by said feeder;
an energizing device configured to energize said DC motor;
an energization control part configured to control energization by said energizing device;
a short-circuiting device configured to short-circuit a positive electrode and an negative electrode of said DC motor and brake when deenergized under control of said energization control part for said energizing device;
a temperature detecting device configured to detect a temperature of ambient surroundings; and
a braking control part configured to control said short-circuiting device in accordance with the temperature detected by said temperature detecting device, to thereby variably control an operation mode of said braking by said short circuiting.

2. The printer according to claim 1 , further comprising a cutter configured to cut said print-receiving medium on which printing has been performed by said printing head, disposed downstream of said printing head in a direction of said feeding, wherein:
said short-circuiting device is configured to perform said short-circuiting and said braking after termination of printing on said print area by said printing head, so as to allow said cutter to face a desired cutting position lying upstream of said print area in said feeding direction on said print-receiving medium, and
said braking control part is configured to control said short-circuiting device so as to set a length from an upstream end of said print area in said feeding direction on said print-receiving medium to said cutting position to a substantially constant value.

3. The printer according to claim 2 , wherein:
said short-circuiting device is configured to continuously perform said braking from braking start timing that is variably set to braking termination timing that is fixedly set, and
said braking control part is configured to retard said braking start timing when said detected temperature is low and to advance said braking start timing when said detected temperature is high.

4. The printer according to claim 3 , wherein
said braking termination timing is later than at least inertia stop timing at which said print-receiving tape stops by inertia when assuming that said braking is not performed.

5. The printer according to claim 2 , wherein:
said short-circuiting device is configured to intermittently perform said braking from braking start timing that is fixedly set to braking termination timing that is fixedly set, and
said braking control part is configured to increase the number of times of a non-braking period during the braking intermittently performed when said detected temperature is low, and is configured to decrease the number of times of said non-braking period or not to provide said non-braking period when said detected temperature is high.

6. The printer according to claim 5 , wherein:
said short-circuiting device is configured to input a rectangular-wave signal having a first level and a second level, to thereby perform said short circuiting at timing when said rectangular-wave signal is at said first level, and
said braking control part is configured to increase the number of times by which said rectangular-wave signal goes to said second level when said detected temperature is low, and is configured to decrease the number of times by which said rectangular-wave signal goes to said second level or to prevent said rectangular-wave signal from going to said second level when said detected temperature is high.

7. The printer according to claim 1 , wherein
said braking control part is configured to control said short-circuiting device so as to perform said short circuiting after a predetermined wait time from deenergization by said energization control part has lapsed.

8. The printer according to claim 1 , further comprising a memory storing a correlation between a braking length by means of short circuiting by said short-circuiting device and a temperature detected by said temperature detecting device, wherein
said braking control part is configured to refer to said correlation stored in said memory to control said short-circuiting device so as to obtain said braking length in accordance with the temperature detected by said temperature detecting device.

Assignees

• Brother Ind Ltd

Inventors

• Ishikawa Ryosuke
• Murakami Yasuhiko
• Kato Yushi

Classifications

• H02P3/08

  for stopping or slowing a DC motor · CPC title

• H02P3/12

  by short-circuit or resistive braking · CPC title

• B41J11/24

  Detents, brakes, or couplings for feed rollers or platens · CPC title

• B41J11/70

  cutting perpendicular to the direction of paper feed · CPC title

• B41J11/007 Primary

  Conveyor belts or like feeding devices · CPC title